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Merge pull request #34 from eugenp/master

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update
This commit is contained in:
Maiklins
2020-02-14 12:13:39 +01:00
committed by GitHub
parent 307205ce04 f81a203765
commit 5d4cec78a6
240 changed files with 26578 additions and 411 deletions
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.gitignore
+1
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@@ -65,6 +65,7 @@ core-java-io/target_link.txt
core-java/src/main/java/com/baeldung/manifest/MANIFEST.MF
ethereum/logs/
jmeter/src/main/resources/*-JMeter.csv
ninja/devDb.mv.db
**/node_modules/
**/dist
algorithms-miscellaneous-5/README.md
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@@ -13,4 +13,11 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [The Caesar Cipher in Java](https://www.baeldung.com/java-caesar-cipher)
- [Overview of Combinatorial Problems in Java](https://www.baeldung.com/java-combinatorial-algorithms)
- [Prim’s Algorithm](https://www.baeldung.com/java-prim-algorithm)
- [Maximum Subarray Problem](https://www.baeldung.com/java-maximum-subarray)
- [How to Merge Two Sorted Arrays](https://www.baeldung.com/java-merge-sorted-arrays)
- [Median of Stream of Integers using Heap](https://www.baeldung.com/java-stream-integers-median-using-heap)
- [Kruskal’s Algorithm for Spanning Trees](https://www.baeldung.com/java-spanning-trees-kruskal)
- [Balanced Brackets Algorithm in Java](https://www.baeldung.com/java-balanced-brackets-algorithm)
- [Efficiently Merge Sorted Java Sequences](https://www.baeldung.com/java-merge-sorted-sequences)
- [Introduction to Greedy Algorithms with Java](https://www.baeldung.com/java-greedy-algorithms)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-4)
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/balancedbinarytree/AVLTree.java
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@@ -0,0 +1,141 @@
package com.baeldung.algorithms.balancedbinarytree;
public class AVLTree {
public class Node {
int key;
int height;
Node left;
Node right;
Node(int key) {
this.key = key;
}
}
private Node root;
public Node find(int key) {
Node current = root;
while (current != null) {
if (current.key == key) {
break;
}
current = current.key < key ? current.right : current.left;
}
return current;
}
public void insert(int key) {
root = insert(root, key);
}
public void delete(int key) {
root = delete(root, key);
}
public Node getRoot() {
return root;
}
public int height() {
return root == null ? -1 : root.height;
}
private Node insert(Node node, int key) {
if (node == null) {
return new Node(key);
} else if (node.key > key) {
node.left = insert(node.left, key);
} else if (node.key < key) {
node.right = insert(node.right, key);
} else {
throw new RuntimeException("duplicate Key!");
}
return rebalance(node);
}
private Node delete(Node node, int key) {
if (node == null) {
return node;
} else if (node.key > key) {
node.left = delete(node.left, key);
} else if (node.key < key) {
node.right = delete(node.right, key);
} else {
if (node.left == null || node.right == null) {
node = (node.left == null) ? node.right : node.left;
} else {
Node mostLeftChild = mostLeftChild(node.right);
node.key = mostLeftChild.key;
node.right = delete(node.right, node.key);
}
}
if (node != null) {
node = rebalance(node);
}
return node;
}
private Node mostLeftChild(Node node) {
Node current = node;
/* loop down to find the leftmost leaf */
while (current.left != null) {
current = current.left;
}
return current;
}
private Node rebalance(Node z) {
updateHeight(z);
int balance = getBalance(z);
if (balance > 1) {
if (height(z.right.right) > height(z.right.left)) {
z = rotateLeft(z);
} else {
z.right = rotateRight(z.right);
z = rotateLeft(z);
}
} else if (balance < -1) {
if (height(z.left.left) > height(z.left.right)) {
z = rotateRight(z);
} else {
z.left = rotateLeft(z.left);
z = rotateRight(z);
}
}
return z;
}
private Node rotateRight(Node y) {
Node x = y.left;
Node z = x.right;
x.right = y;
y.left = z;
updateHeight(y);
updateHeight(x);
return x;
}
private Node rotateLeft(Node y) {
Node x = y.right;
Node z = x.left;
x.left = y;
y.right = z;
updateHeight(y);
updateHeight(x);
return x;
}
private void updateHeight(Node n) {
n.height = 1 + Math.max(height(n.left), height(n.right));
}
private int height(Node n) {
return n == null ? -1 : n.height;
}
public int getBalance(Node n) {
return (n == null) ? 0 : height(n.right) - height(n.left);
}
}
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/balancedbinarytree/AVLTreeUnitTest.java
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@@ -0,0 +1,83 @@
package com.baeldung.algorithms.balancedbinarytree;
import org.junit.Assert;
import org.junit.Test;
public class AVLTreeUnitTest {
@Test
public void givenEmptyTree_whenHeightCalled_shouldReturnMinus1() {
AVLTree tree = new AVLTree();
Assert.assertEquals(-1, tree.height());
}
@Test
public void givenEmptyTree_whenInsertCalled_heightShouldBeZero() {
AVLTree tree = new AVLTree();
tree.insert(1);
Assert.assertEquals(0, tree.height());
}
@Test
public void givenEmptyTree_whenInsertCalled_treeShouldBeAvl() {
AVLTree tree = new AVLTree();
tree.insert(1);
Assert.assertTrue(isAVL(tree));
}
@Test
public void givenSampleTree_whenInsertCalled_treeShouldBeAvl() {
AVLTree tree = getSampleAVLTree();
int newKey = 11;
tree.insert(newKey);
Assert.assertTrue(isAVL(tree));
}
@Test
public void givenSampleTree_whenFindExistingKeyCalled_shouldReturnMatchedNode() {
AVLTree tree = getSampleAVLTree();
int existingKey = 2;
AVLTree.Node result = tree.find(existingKey);
Assert.assertEquals(result.key, existingKey);
}
@Test
public void givenSampleTree_whenFindNotExistingKeyCalled_shouldReturnNull() {
AVLTree tree = getSampleAVLTree();
int notExistingKey = 11;
AVLTree.Node result = tree.find(notExistingKey);
Assert.assertNull(result);
}
@Test
public void givenEmptyTree_whenDeleteCalled_treeShouldBeAvl() {
AVLTree tree = new AVLTree();
tree.delete(1);
Assert.assertTrue(isAVL(tree));
}
@Test
public void givenSampleTree_whenDeleteCalled_treeShouldBeAvl() {
AVLTree tree = getSampleAVLTree();
tree.delete(1);
Assert.assertTrue(isAVL(tree, tree.getRoot()));
}
private boolean isAVL(AVLTree tree) {
return isAVL(tree, tree.getRoot());
}
private boolean isAVL(AVLTree tree, AVLTree.Node node) {
if ( node == null )
return true;
int balance = tree.getBalance(node);
return (balance <= 1 && balance >= -1) && isAVL(tree, node.left) && isAVL(tree, node.right);
}
private AVLTree getSampleAVLTree() {
AVLTree avlTree = new AVLTree();
for (int i = 0; i < 10; i++)
avlTree.insert(i);
return avlTree;
}
}
algorithms-sorting-2/README.md
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@@ -0,0 +1,3 @@
### Relevant Articles:
- [Partitioning and Sorting Arrays with Many Repeated Entries](https://www.baeldung.com/java-sorting-arrays-with-repeated-entries)
apache-poi/README.md
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@@ -6,3 +6,6 @@ This module contains articles about Apache POI
- [Microsoft Word Processing in Java with Apache POI](https://www.baeldung.com/java-microsoft-word-with-apache-poi)
- [Working with Microsoft Excel in Java](https://www.baeldung.com/java-microsoft-excel)
- [Creating a MS PowerPoint Presentation in Java](https://www.baeldung.com/apache-poi-slideshow)
- [Merge Cells in Excel Using Apache POI](https://www.baeldung.com/java-apache-poi-merge-cells)
- [Get String Value of Excel Cell with Apache POI](https://www.baeldung.com/java-apache-poi-cell-string-value)
- [Read Excel Cell Value Rather Than Formula With Apache POI](https://github.com/eugenp/tutorials/tree/master/apache-poi)
apache-poi/src/test/java/com/baeldung/poi/excel/ExcelCellMergerUnitTest.java → apache-poi/src/test/java/com/baeldung/poi/excel/merge/ExcelCellMergerUnitTest.java
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@@ -1,4 +1,4 @@
package com.baeldung.poi.excel;
package com.baeldung.poi.excel.merge;
import static org.junit.Assert.assertEquals;
apache-rocketmq/README.md
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@@ -3,3 +3,5 @@
This module contains articles about Apache RocketMQ
### Relevant Articles:
- [Apache RocketMQ with Spring Boot](https://www.baeldung.com/apache-rocketmq-spring-boot)
aws-reactive/README.md
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@@ -0,0 +1,3 @@
### Relevant Articles:
- [AWS S3 with Java – Reactive Support](https://www.baeldung.com/java-aws-s3-reactive)
core-java-modules/core-java-11/README.md
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@@ -13,3 +13,4 @@ This module contains articles about Java 11 core features
- [Guide to jlink](https://www.baeldung.com/jlink)
- [Negate a Predicate Method Reference with Java 11](https://www.baeldung.com/java-negate-predicate-method-reference)
- [Benchmark JDK Collections vs Eclipse Collections](https://www.baeldung.com/jdk-collections-vs-eclipse-collections)
- [Pre-compile Regex Patterns Into Pattern Objects](https://www.baeldung.com/java-regex-pre-compile)
core-java-modules/core-java-13/README.md
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@@ -1,3 +1,4 @@
### Relevant articles:
- [Java Switch Statement](https://www.baeldung.com/java-switch)
- [New Java 13 Features](https://www.baeldung.com/java-13-new-features)
core-java-modules/core-java-14/.mvn/jvm.config
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@@ -0,0 +1 @@
--enable-preview
core-java-modules/core-java-14/README.md
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@@ -0,0 +1,7 @@
## Core Java 14
This module contains articles about Java 14.
### Relevant articles
- [Guide to the @Serial Annotation in Java 14](https://www.baeldung.com/java-14-serial-annotation)
core-java-modules/core-java-14/pom.xml
+59 -46
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@@ -1,53 +1,66 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-14</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>core-java-14</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-14</artifactId>
<name>core-java-14</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<compilerArgs>
<compilerArg>
--enable-preview
</compilerArg>
</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>14</maven.compiler.source.version>
<maven.compiler.target.version>14</maven.compiler.target.version>
<properties>
<maven.compiler.release>14</maven.compiler.release>
<assertj.version>3.6.1</assertj.version>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
</properties>
</properties>
</project>
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/textblocks/TextBlocks13.java
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@@ -0,0 +1,46 @@
package com.baeldung.java14.textblocks;
public class TextBlocks13 {
public String getBlockOfHtml() {
return """
<html>
<body>
<span>example text</span>
</body>
</html>""";
}
public String getNonStandardIndent() {
return """
Indent
""";
}
public String getQuery() {
return """
select "id", "user"
from "table"
""";
}
public String getTextWithCarriageReturns() {
return """
separated with\r
carriage returns""";
}
public String getTextWithEscapes() {
return """
fun with\n
whitespace\t\r
and other escapes \"""
""";
}
public String getFormattedText(String parameter) {
return """
Some parameter: %s
""".formatted(parameter);
}
}
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/textblocks/TextBlocks14.java
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@@ -0,0 +1,16 @@
package com.baeldung.java14.textblocks;
public class TextBlocks14 {
public String getIgnoredNewLines() {
return """
This is a long test which looks to \
have a newline but actually does not""";
}
public String getEscapedSpaces() {
return """
line 1
line 2 \s
""";
}
}
core-java-modules/core-java-14/src/main/java/com/baeldung/serial/MySerialClass.java
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@@ -10,41 +10,41 @@ import java.io.Serializable;
/**
* Class showcasing the usage of the Java 14 @Serial annotation.
*
*
* @author Donato Rimenti
*/
public class MySerialClass implements Serializable {
@Serial
private static final ObjectStreamField[] serialPersistentFields = null;
@Serial
private static final long serialVersionUID = 1;
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
// ...
}
@Serial
private static final ObjectStreamField[] serialPersistentFields = null;
@Serial
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
// ...
}
@Serial
private static final long serialVersionUID = 1;
@Serial
private void readObjectNoData() throws ObjectStreamException {
// ...
}
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
// ...
}
@Serial
private Object writeReplace() throws ObjectStreamException {
// ...
return null;
}
@Serial
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
// ...
}
@Serial
private Object readResolve() throws ObjectStreamException {
// ...
return null;
}
@Serial
private void readObjectNoData() throws ObjectStreamException {
// ...
}
@Serial
private Object writeReplace() throws ObjectStreamException {
// ...
return null;
}
@Serial
private Object readResolve() throws ObjectStreamException {
// ...
return null;
}
}
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/textblocks/TextBlocks13UnitTest.java
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@@ -0,0 +1,58 @@
package com.baeldung.java14.textblocks;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;
class TextBlocks13UnitTest {
private TextBlocks13 subject = new TextBlocks13();
@Test
void givenAnOldStyleMultilineString_whenComparing_thenEqualsTextBlock() {
String expected = "<html>\n"
+ "\n"
+ " <body>\n"
+ " <span>example text</span>\n"
+ " </body>\n"
+ "</html>";
assertThat(subject.getBlockOfHtml()).isEqualTo(expected);
}
@Test
void givenAnOldStyleString_whenComparing_thenEqualsTextBlock() {
String expected = "<html>\n\n <body>\n <span>example text</span>\n </body>\n</html>";
assertThat(subject.getBlockOfHtml()).isEqualTo(expected);
}
@Test
void givenAnIndentedString_thenMatchesIndentedOldStyle() {
assertThat(subject.getNonStandardIndent()).isEqualTo(" Indent\n");
}
@Test
void givenAMultilineQuery_thenItCanContainUnescapedQuotes() {
assertThat(subject.getQuery()).contains("select \"id\", \"user\"");
}
@Test
void givenAMultilineQuery_thenItEndWithANewline() {
assertThat(subject.getQuery()).endsWith("\n");
}
@Test
void givenATextWithCarriageReturns_thenItContainsBoth() {
assertThat(subject.getTextWithCarriageReturns()).isEqualTo("separated with\r\ncarriage returns");
}
@Test
void givenAStringWithEscapedWhitespace_thenItAppearsInTheResultingString() {
assertThat(subject.getTextWithEscapes()).contains("fun with\n\n")
.contains("whitespace\t\r\n")
.contains("and other escapes \"\"\"");
}
@Test
void givenAFormattedString_thenTheParameterIsReplaced() {
assertThat(subject.getFormattedText("parameter")).contains("Some parameter: parameter");
}
}
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/textblocks/TextBlocks14UnitTest.java
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@@ -0,0 +1,21 @@
package com.baeldung.java14.textblocks;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;
class TextBlocks14UnitTest {
private TextBlocks14 subject = new TextBlocks14();
@Test
void givenAStringWithEscapedNewLines_thenTheResultHasNoNewLines() {
String expected = "This is a long test which looks to have a newline but actually does not";
assertThat(subject.getIgnoredNewLines()).isEqualTo(expected);
}
@Test
void givenAStringWithEscapesSpaces_thenTheResultHasLinesEndingWithSpaces() {
String expected = "line 1\nline 2 \n";
assertThat(subject.getEscapedSpaces()).isEqualTo(expected);
}
}
core-java-modules/core-java-arrays-2/README.md
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@@ -13,4 +13,5 @@ This module contains articles about Java arrays
- [Removing an Element from an Array in Java](https://www.baeldung.com/java-array-remove-element)
- [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)
- [Adding an Element to a Java Array vs an ArrayList](https://www.baeldung.com/java-add-element-to-array-vs-list)
- [Arrays.sort vs Arrays.parallelSort](https://www.baeldung.com/java-arrays-sort-vs-parallelsort)
- [[<-- Prev]](/core-java-modules/core-java-arrays)
core-java-modules/core-java-arrays-2/src/test/java/com/baeldung/arraysort/SortComparisonUnitTest.java
+2 -2
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@@ -69,7 +69,7 @@ public class SortComparisonUnitTest {
}
@Test
public void givenArrayOfIntegers_whenUsingArraysSortMethodWithRange_thenSortRangeOfArrayInAscendingOrder() {
public void givenArrayOfIntegers_whenUsingArraysSortWithRange_thenSortRangeOfArrayAsc() {
int[] array = { 10, 4, 6, 2, 1, 9, 7, 8, 3, 5 };
int[] expected = { 10, 4, 1, 2, 6, 7, 8, 9, 3, 5 };
@@ -89,7 +89,7 @@ public class SortComparisonUnitTest {
}
@Test
public void givenArrayOfIntegers_whenUsingArraysParallelSortMethodWithRange_thenSortRangeOfArrayInAscendingOrder() {
public void givenArrayOfIntegers_whenUsingArraysParallelSortWithRange_thenSortRangeOfArrayAsc() {
int[] array = { 10, 4, 6, 2, 1, 9, 7, 8, 3, 5 };
int[] expected = { 10, 4, 1, 2, 6, 7, 8, 9, 3, 5 };
core-java-modules/core-java-concurrency-advanced-3/README.md
+3 -1
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@@ -8,4 +8,6 @@ This module contains articles about advanced topics about multithreading with co
- [Common Concurrency Pitfalls in Java](https://www.baeldung.com/java-common-concurrency-pitfalls)
- [Guide to RejectedExecutionHandler](https://www.baeldung.com/java-rejectedexecutionhandler)
[[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)
- [Guide to Work Stealing in Java](https://www.baeldung.com/java-work-stealing)
- [Asynchronous Programming in Java](https://www.baeldung.com/java-asynchronous-programming)
- [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)
core-java-modules/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/volatilekeyword/SharedObject.java
+1 -1
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@@ -4,7 +4,7 @@ package com.baeldung.concurrent.volatilekeyword;
public class SharedObject {
private volatile int count=0;
void increamentCount(){
void incrementCount(){
count++;
}
public int getCount(){
core-java-modules/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/volatilekeyword/SharedObjectManualTest.java
+3 -3
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@@ -10,7 +10,7 @@ public class SharedObjectManualTest {
public void whenOneThreadWrites_thenVolatileReadsFromMainMemory() throws InterruptedException {
SharedObject sharedObject = new SharedObject();
Thread writer = new Thread(() -> sharedObject.increamentCount());
Thread writer = new Thread(() -> sharedObject.incrementCount());
writer.start();
Thread.sleep(100);
@@ -31,11 +31,11 @@ public class SharedObjectManualTest {
@Test
public void whenTwoThreadWrites_thenVolatileReadsFromMainMemory() throws InterruptedException {
SharedObject sharedObject = new SharedObject();
Thread writerOne = new Thread(() -> sharedObject.increamentCount());
Thread writerOne = new Thread(() -> sharedObject.incrementCount());
writerOne.start();
Thread.sleep(100);
Thread writerTwo = new Thread(() -> sharedObject.increamentCount());
Thread writerTwo = new Thread(() -> sharedObject.incrementCount());
writerTwo.start();
Thread.sleep(100);
core-java-modules/core-java-date-operations-2/README.md
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@@ -6,4 +6,5 @@ This module contains articles about date operations in Java.
- [Skipping Weekends While Adding Days to LocalDate in Java 8](https://www.baeldung.com/java-localdate-add-days-skip-weekends)
- [Checking If Two Java Dates Are on the Same Day](https://www.baeldung.com/java-check-two-dates-on-same-day)
- [Converting Java Date to OffsetDateTime](https://www.baeldung.com/java-convert-date-to-offsetdatetime)
- [How to Set the JVM Time Zone](https://www.baeldung.com/java-jvm-time-zone)
- [[<-- Prev]](/core-java-modules/core-java-date-operations-1)
core-java-modules/core-java-datetime-java8-2/README.md
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@@ -0,0 +1,3 @@
### Relevant Articles:
- [Creating a LocalDate with Values in Java](https://www.baeldung.com/java-creating-localdate-with-values)
core-java-modules/core-java-exceptions-2/README.md
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@@ -5,3 +5,5 @@ This module contains articles about core java exceptions
### Relevant Articles:
- [Is It a Bad Practice to Catch Throwable?](https://www.baeldung.com/java-catch-throwable-bad-practice)
- [Wrapping vs Rethrowing Exceptions in Java](https://www.baeldung.com/java-wrapping-vs-rethrowing-exceptions)
- [java.net.UnknownHostException: Invalid Hostname for Server](https://www.baeldung.com/java-unknownhostexception)
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/socketexception/SocketClient.java
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@@ -0,0 +1,32 @@
package com.baeldung.socketexception;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
public class SocketClient {
private Socket clientSocket;
private PrintWriter out;
private BufferedReader in;
public void startConnection(String ip, int port) throws IOException {
clientSocket = new Socket(ip, port);
out = new PrintWriter(clientSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
}
public String sendMessage(String msg) throws IOException {
out.println(msg);
return in.readLine();
}
public void stopConnection() throws IOException {
in.close();
out.close();
clientSocket.close();
}
}
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/socketexception/SocketServer.java
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@@ -0,0 +1,45 @@
package com.baeldung.socketexception;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class SocketServer {
private ServerSocket serverSocket;
private Socket clientSocket;
private PrintWriter out;
private BufferedReader in;
public void start(int port) {
try {
serverSocket = new ServerSocket(port);
clientSocket = serverSocket.accept();
out = new PrintWriter(clientSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String msg = in.readLine();
if (msg.contains("hi"))
out.println("hi");
else
out.println("didn't understand");
close();
stop();
} catch (IOException e) {
}
}
private void close() throws IOException {
in.close();
out.close();
}
private void stop() throws IOException {
clientSocket.close();
serverSocket.close();
}
}
core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/socketexception/SocketExceptionHandlingUnitTest.java
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@@ -0,0 +1,31 @@
package com.baeldung.socketexception;
import java.io.IOException;
import java.net.SocketException;
import java.util.concurrent.Executors;
import org.junit.BeforeClass;
import org.junit.Test;
public class SocketExceptionHandlingUnitTest {
@BeforeClass
public static void runServer() throws IOException, InterruptedException {
Executors.newSingleThreadExecutor()
.submit(() -> new SocketServer().start(6699));
Thread.sleep(100);
}
@Test
public void givenRunningServer_whenConnectToClosedSocket_thenHandleException() throws IOException {
SocketClient client = new SocketClient();
client.startConnection("127.0.0.1", 6699);
try {
client.sendMessage("hi");
client.sendMessage("hi again");
} catch (SocketException e) {
client.stopConnection();
}
}
}
core-java-modules/core-java-lang-2/README.md
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@@ -6,4 +6,7 @@ This module contains articles about core features in the Java language
- [Java Primitives versus Objects](https://www.baeldung.com/java-primitives-vs-objects)
- [Command-Line Arguments in Java](https://www.baeldung.com/java-command-line-arguments)
- [What is a POJO Class?](https://www.baeldung.com/java-pojo-class)
- [Java Default Parameters Using Method Overloading](https://www.baeldung.com/java-default-parameters-method-overloading)
- [How to Return Multiple Values From a Java Method](https://www.baeldung.com/java-method-return-multiple-values)
- [Guide to the Java finally Keyword](https://www.baeldung.com/java-finally-keyword)
- [[<-- Prev]](/core-java-modules/core-java-lang)
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/headlessmode/FlexibleApp.java
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@@ -0,0 +1,27 @@
package com.baeldung.headlessmode;
import java.awt.GraphicsEnvironment;
import javax.swing.JOptionPane;
public class FlexibleApp {
public static final int HEADLESS = 0;
public static final int HEADED = 1;
public FlexibleApp() {
if (GraphicsEnvironment.isHeadless()) {
System.out.println("Hello World");
} else {
JOptionPane.showMessageDialog(null, "Hello World");
}
}
public static int iAmFlexible() {
if (GraphicsEnvironment.isHeadless()) {
return HEADLESS;
} else {
return HEADED;
}
}
}
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/headlessmode/HeadlessModeUnitTest.java
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@@ -0,0 +1,87 @@
package com.baeldung.headlessmode;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
import java.awt.Canvas;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import org.junit.Assume;
import org.junit.Before;
import org.junit.Test;
public class HeadlessModeUnitTest {
private static final String IN_FILE = "/product.png";
private static final String OUT_FILE = System.getProperty("java.io.tmpdir") + "/product.jpg";
private static final String FORMAT = "jpg";
@Before
public void setUpHeadlessMode() {
System.setProperty("java.awt.headless", "true");
}
@Test
public void whenJavaAwtHeadlessSetToTrue_thenIsHeadlessReturnsTrue() {
assertThat(GraphicsEnvironment.isHeadless()).isTrue();
}
@Test
public void whenHeadlessMode_thenFontsWork() {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
String fonts[] = ge.getAvailableFontFamilyNames();
assertThat(fonts).isNotEmpty();
Font font = new Font(fonts[0], Font.BOLD, 14);
FontMetrics fm = (new Canvas()).getFontMetrics(font);
assertThat(fm.getHeight()).isGreaterThan(0);
assertThat(fm.getAscent()).isGreaterThan(0);
assertThat(fm.getDescent()).isGreaterThan(0);
}
@Test
public void whenHeadlessMode_thenImagesWork() throws IOException {
boolean result = false;
try (InputStream inStream = HeadlessModeUnitTest.class.getResourceAsStream(IN_FILE); FileOutputStream outStream = new FileOutputStream(OUT_FILE)) {
BufferedImage inputImage = ImageIO.read(inStream);
result = ImageIO.write(inputImage, FORMAT, outStream);
}
assertThat(result).isTrue();
}
@Test
public void whenHeadlessmode_thenFrameThrowsHeadlessException() {
assertThatExceptionOfType(HeadlessException.class).isThrownBy(() -> {
Frame frame = new Frame();
frame.setVisible(true);
frame.setSize(120, 120);
});
}
@Test
public void whenHeadless_thenFlexibleAppAdjustsItsBehavior() {
assertThat(FlexibleApp.iAmFlexible()).isEqualTo(FlexibleApp.HEADLESS);
}
@Test
public void whenHeaded_thenFlexibleAppAdjustsItsBehavior() {
Assume.assumeFalse(GraphicsEnvironment.isHeadless());
assertThat(FlexibleApp.iAmFlexible()).isEqualTo(FlexibleApp.HEADED);
}
}
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core-java-modules/core-java-lang-math/README.md
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@@ -9,3 +9,4 @@
- [The strictfp Keyword in Java](https://www.baeldung.com/java-strictfp)
- [Basic Calculator in Java](https://www.baeldung.com/java-basic-calculator)
- [Overflow and Underflow in Java](https://www.baeldung.com/java-overflow-underflow)
- [Obtaining a Power Set of a Set in Java](https://www.baeldung.com/java-power-set-of-a-set)
core-java-modules/core-java-lang-oop/README.md
+1
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@@ -13,4 +13,5 @@ This module contains articles about Object-oriented programming (OOP) in Java
- [The “final” Keyword in Java](https://www.baeldung.com/java-final)
- [Type Erasure in Java Explained](https://www.baeldung.com/java-type-erasure)
- [Variable and Method Hiding in Java](https://www.baeldung.com/java-variable-method-hiding)
- [Object-Oriented-Programming Concepts in Java](https://www.baeldung.com/java-oop)
- [[More -->]](/core-java-modules/core-java-lang-oop-2)
core-java-modules/core-java-lang-syntax-2/README.md
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@@ -12,4 +12,5 @@ This module contains articles about Java syntax
- [Variable Scope in Java](https://www.baeldung.com/java-variable-scope)
- [Introduction to Basic Syntax in Java](https://www.baeldung.com/java-syntax)
- [Java ‘protected’ Access Modifier](https://www.baeldung.com/java-protected-access-modifier)
- [Using the Not Operator in If Conditions in Java](https://www.baeldung.com/java-using-not-in-if-conditions)
- [[<-- Prev]](/core-java-modules/core-java-lang-syntax)
core-java-modules/core-java-lang-syntax/README.md
+3
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@@ -13,4 +13,7 @@ This module contains articles about Java syntax
- [Infinite Loops in Java](https://www.baeldung.com/infinite-loops-java)
- [Java Switch Statement](https://www.baeldung.com/java-switch)
- [Breaking Out of Nested Loops](https://www.baeldung.com/java-breaking-out-nested-loop)
- [Java Do-While Loop](https://www.baeldung.com/java-do-while-loop)
- [Java While Loop](https://www.baeldung.com/java-while-loop)
- [Java For Loop](https://www.baeldung.com/java-for-loop)
- [[More -->]](/core-java-modules/core-java-lang-syntax-2)
core-java-modules/core-java-reflection/README.MD
+2 -1
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@@ -6,4 +6,5 @@
- [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
- [Call Methods at Runtime Using Java Reflection](http://www.baeldung.com/java-method-reflection)
- [Changing Annotation Parameters At Runtime](http://www.baeldung.com/java-reflection-change-annotation-params)
- [Dynamic Proxies in Java](http://www.baeldung.com/java-dynamic-proxies)
- [Dynamic Proxies in Java](http://www.baeldung.com/java-dynamic-proxies)
- [What Causes java.lang.reflect.InvocationTargetException?](https://www.baeldung.com/java-lang-reflect-invocationtargetexception)
core-java-modules/core-java-regex/README.md
+10
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@@ -0,0 +1,10 @@
=========
## Core Java 8 Cookbooks and Examples
### Relevant Articles:
- [An Overview of Regular Expressions Performance in Java](https://www.baeldung.com/java-regex-performance)
- [A Guide To Java Regular Expressions API](http://www.baeldung.com/regular-expressions-java)
- [Guide to Escaping Characters in Java RegExps](http://www.baeldung.com/java-regexp-escape-char)
- [Pre-compile Regex Patterns Into Pattern Objects](https://www.baeldung.com/java-regex-pre-compile)
- [Difference Between Java Matcher find() and matches()](https://www.baeldung.com/java-matcher-find-vs-matches)
core-java-modules/core-java-text/pom.xml → core-java-modules/core-java-regex/pom.xml
+3 -3
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@@ -2,9 +2,9 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-text</artifactId>
<artifactId>core-java-regex</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-text</name>
<name>core-java-regex</name>
<packaging>jar</packaging>
<parent>
@@ -28,7 +28,7 @@
</dependencies>
<build>
<finalName>core-java-text</finalName>
<finalName>core-java-regex</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
core-java-modules/core-java-text/src/main/java/com/baeldung/patternreuse/PatternPerformanceComparison.java → core-java-modules/core-java-regex/src/main/java/com/baeldung/patternreuse/PatternPerformanceComparison.java
View File
core-java-modules/core-java-text/src/main/resources/logback.xml → core-java-modules/core-java-regex/src/main/resources/logback.xml
View File
core-java-modules/core-java-text/src/test/java/com/baeldung/patternreuse/PatternUnitTest.java → core-java-modules/core-java-regex/src/test/java/com/baeldung/patternreuse/PatternUnitTest.java
View File
core-java-modules/core-java/src/test/java/com/baeldung/java/regex/RegexUnitTest.java → core-java-modules/core-java-regex/src/test/java/com/baeldung/regex/RegexUnitTest.java
+1 -1
View File
@@ -1,4 +1,4 @@
package com.baeldung.java.regex;
package com.baeldung.regex;
import static org.junit.Assert.*;
core-java-modules/core-java-text/src/test/java/com/baeldung/regex/matcher/MatcherUnitTest.java → core-java-modules/core-java-regex/src/test/java/com/baeldung/regex/matcher/MatcherUnitTest.java
View File
core-java-modules/core-java/src/test/java/com/baeldung/regexp/EscapingCharsUnitTest.java → core-java-modules/core-java-regex/src/test/java/com/baeldung/regexp/EscapingCharsUnitTest.java
View File
core-java-modules/core-java/src/test/java/com/baeldung/regexp/optmization/OptimizedMatcherManualTest.java → core-java-modules/core-java-regex/src/test/java/com/baeldung/regexp/optmization/OptimizedMatcherManualTest.java
View File
core-java-modules/core-java-string-operations-2/README.md
+1
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@@ -8,4 +8,5 @@ This module contains articles about string operations.
- [String Initialization in Java](https://www.baeldung.com/java-string-initialization)
- [String toLowerCase and toUpperCase Methods in Java](https://www.baeldung.com/java-string-convert-case)
- [Java String equalsIgnoreCase()](https://www.baeldung.com/java-string-equalsignorecase)
- [How to avoid String contains() Case Insensitive in Java](https://www.baeldung.com/how-to-avoid-string-contains-case-insensitive-in-java)
- More articles: [[<-- prev]](../core-java-string-operations)
core-java-modules/core-java-string-operations-2/pom.xml
+38 -2
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@@ -1,6 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-string-operations-2</artifactId>
<version>0.1.0-SNAPSHOT</version>
@@ -51,6 +52,18 @@
<version>${org.hamcrest.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh-generator.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
@@ -61,6 +74,29 @@
<build>
<finalName>core-java-string-operations-2</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.openjdk.jmh.Main</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/contains/CaseInsensitiveWorkarounds.java
+78
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@@ -0,0 +1,78 @@
package com.baeldung.contains;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
/**
* Based on https://github.com/tedyoung/indexof-contains-benchmark
*/
@Fork(5)
@State(Scope.Benchmark)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class CaseInsensitiveWorkarounds {
private String src;
private String dest;
private Pattern pattern;
public static void main(String[] args) throws Exception {
org.openjdk.jmh.Main.main(args);
}
@Setup
public void setup() {
src = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum";
dest = "eiusmod";
pattern = Pattern.compile(Pattern.quote(dest), Pattern.CASE_INSENSITIVE);
}
// toLowerCase() and contains()
@Benchmark
public boolean lowerCaseContains() {
return src.toLowerCase()
.contains(dest.toLowerCase());
}
// matches() with Regular Expressions
@Benchmark
public boolean matchesRegularExpression() {
return src.matches("(?i).*" + dest + ".*");
}
public boolean processRegionMatches(String localSrc, String localDest) {
for (int i = localSrc.length() - localDest.length(); i >= 0; i--)
if (localSrc.regionMatches(true, i, localDest, 0, localDest.length()))
return true;
return false;
}
// String regionMatches()
@Benchmark
public boolean regionMatches() {
return processRegionMatches(src, dest);
}
// Pattern CASE_INSENSITIVE with regexp
@Benchmark
public boolean patternCaseInsensitiveRegexp() {
return pattern.matcher(src)
.find();
}
// Apache Commons StringUtils containsIgnoreCase
@Benchmark
public boolean apacheCommonsStringUtils() {
return org.apache.commons.lang3.StringUtils.containsIgnoreCase(src, dest);
}
}
core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/contains/CaseInsensitiveWorkaroundsUnitTest.java
+53
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@@ -0,0 +1,53 @@
package com.baeldung.contains;
import org.apache.commons.lang3.StringUtils;
import org.junit.Assert;
import org.junit.Test;
import java.util.regex.Pattern;
/**
* BAEL-3739: Different ways to solve the contains() case insensitive behavior.
*/
public class CaseInsensitiveWorkaroundsUnitTest {
private String src = "Lorem ipsum dolor sit amet";
private String dest = "lorem";
@Test
public void givenString_whenCallingContainsWithToLowerOrUpperCase_shouldReturnTrue() {
// Use toLowerCase to avoid case insensitive issues
Assert.assertTrue(src.toLowerCase().contains(dest.toLowerCase()));
// Use toUpperCase to avoid case insensitive issues
Assert.assertTrue(src.toUpperCase().contains(dest.toUpperCase()));
}
@Test
public void givenString_whenCallingStringMatches_thenReturnsTrue() {
// Use String Matches to avoid case insensitive issues
Assert.assertTrue(src.matches("(?i).*" + dest + ".*"));
}
@Test
public void givenString_whenCallingStringRegionMatches_thenReturnsTrue() {
// Use String Region Matches to avoid case insensitive issues
CaseInsensitiveWorkarounds comparator = new CaseInsensitiveWorkarounds();
Assert.assertTrue(comparator.processRegionMatches(src, dest));
}
@Test
public void givenString_whenCallingPaternCompileMatcherFind_thenReturnsTrue() {
// Use Pattern Compile Matcher and Find to avoid case insensitive issues
Assert.assertTrue(Pattern.compile(Pattern.quote(dest),
Pattern.CASE_INSENSITIVE) .matcher(src) .find());
}
@Test
public void givenString_whenCallingStringUtilsContainsIgnoreCase_thenReturnsTrue() {
// Use StringUtils containsIgnoreCase to avoid case insensitive issues
Assert.assertTrue(StringUtils.containsIgnoreCase(src, dest));
}
}
core-java-modules/core-java-text/README.md
-6
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@@ -1,6 +0,0 @@
=========
## Core Java 8 Cookbooks and Examples
### Relevant Articles:
- [An Overview of Regular Expressions Performance in Java](https://www.baeldung.com/java-regex-performance)
core-java-modules/core-java/README.md
-2
View File
@@ -2,7 +2,6 @@
### Relevant Articles:
- [Java Timer](http://www.baeldung.com/java-timer-and-timertask)
- [A Guide To Java Regular Expressions API](http://www.baeldung.com/regular-expressions-java)
- [Getting Started with Java Properties](http://www.baeldung.com/java-properties)
- [Introduction to Nashorn](http://www.baeldung.com/java-nashorn)
- [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
@@ -11,7 +10,6 @@
- [How to Get a Name of a Method Being Executed?](http://www.baeldung.com/java-name-of-executing-method)
- [Introduction to Java Serialization](http://www.baeldung.com/java-serialization)
- [Guide to UUID in Java](http://www.baeldung.com/java-uuid)
- [Guide to Escaping Characters in Java RegExps](http://www.baeldung.com/java-regexp-escape-char)
- [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)
- [Quick Guide to Java Stack](http://www.baeldung.com/java-stack)
- [Compiling Java *.class Files with javac](http://www.baeldung.com/javac)
core-java-modules/pom.xml
+1 -1
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@@ -113,7 +113,7 @@
<module>core-java-strings</module>
<module>core-java-sun</module>
<module>core-java-text</module>
<module>core-java-regex</module>
<!-- <module>core-java-time-measurements</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
<!-- <module>multimodulemavenproject</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
core-kotlin-modules/core-kotlin-2/README.md
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@@ -4,5 +4,5 @@ This module contains articles about Kotlin core features.
### Relevant articles:
- [Working with Dates in Kotlin](https://www.baeldung.com/kotlin-dates)
- [Kotlin Ternary Conditional Operator](https://www.baeldung.com/kotlin-ternary-conditional-operator)
- [Kotlin Ternary Conditional Operator](https://www.baeldung.com/kotlin-ternary-operator)
- [[<-- Prev]](/core-kotlin-modules/core-kotlin)
core-kotlin-modules/core-kotlin/README.md
+1 -1
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@@ -3,7 +3,7 @@
This module contains articles about Kotlin core features.
### Relevant articles:
- [Introduction to the Kotlin Language](https://www.baeldung.com/kotlin)
- [Introduction to the Kotlin Language](https://www.baeldung.com/kotlin-intro)
- [Kotlin Java Interoperability](https://www.baeldung.com/kotlin-java-interoperability)
- [Get a Random Number in Kotlin](https://www.baeldung.com/kotlin-random-number)
- [Create a Java and Kotlin Project with Maven](https://www.baeldung.com/kotlin-maven-java-project)
data-structures/README.md
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View File
@@ -7,3 +7,5 @@ This module contains articles about data structures in Java
- [The Trie Data Structure in Java](https://www.baeldung.com/trie-java)
- [Implementing a Binary Tree in Java](https://www.baeldung.com/java-binary-tree)
- [Circular Linked List Java Implementation](https://www.baeldung.com/java-circular-linked-list)
- [How to Print a Binary Tree Diagram](https://www.baeldung.com/java-print-binary-tree-diagram)
- [Introduction to Big Queue](https://www.baeldung.com/java-big-queue)
ddd/README.md
+1
View File
@@ -7,3 +7,4 @@ This module contains articles about Domain-driven Design (DDD)
- [Persisting DDD Aggregates](https://www.baeldung.com/spring-persisting-ddd-aggregates)
- [Double Dispatch in DDD](https://www.baeldung.com/ddd-double-dispatch)
- [DDD Aggregates and @DomainEvents](https://www.baeldung.com/spring-data-ddd)
- [Organizing Layers Using Hexagonal Architecture, DDD, and Spring](https://www.baeldung.com/hexagonal-architecture-ddd-spring)
dropwizard/README.md
+5 -1
View File
@@ -1 +1,5 @@
# Dropwizard
# Dropwizard
### Relevant Articles:
- [Introduction to Dropwizard](https://www.baeldung.com/java-dropwizard)
image-processing/pom.xml
+5
View File
@@ -35,6 +35,11 @@
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.openpnp</groupId>
<artifactId>opencv</artifactId>
<version>3.4.2-0</version>
</dependency>
<dependency>
<groupId>com.twelvemonkeys.imageio</groupId>
<artifactId>imageio-core</artifactId>
image-processing/src/main/java/com/baeldung/imageprocessing/opencv/CameraStream.java
+87
View File
@@ -0,0 +1,87 @@
package com.baeldung.imageprocessing.opencv;
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import nu.pattern.OpenCV;
import org.opencv.core.Mat;
import org.opencv.core.MatOfByte;
import org.opencv.core.MatOfRect;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;
import org.opencv.objdetect.Objdetect;
import org.opencv.videoio.VideoCapture;
import java.io.ByteArrayInputStream;
public class CameraStream extends Application {
private VideoCapture capture;
public void start(Stage stage) throws Exception {
OpenCV.loadShared();
capture= new VideoCapture(0); // The number is the ID of the camera
ImageView imageView = new ImageView();
HBox hbox = new HBox(imageView);
Scene scene = new Scene(hbox);
stage.setScene(scene);
stage.show();
new AnimationTimer(){
@Override
public void handle(long l) {
imageView.setImage(getCapture());
}
}.start();
}
public Image getCapture() {
Mat mat = new Mat();
capture.read(mat);
return mat2Img(mat);
}
public Image getCaptureWithFaceDetection() {
Mat mat = new Mat();
capture.read(mat);
Mat haarClassifiedImg = detectFace(mat);
return mat2Img(haarClassifiedImg);
}
public Image mat2Img(Mat mat) {
MatOfByte bytes = new MatOfByte();
Imgcodecs.imencode("img", mat, bytes);
ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes.toArray());
Image img = new Image(inputStream); return img;
}
public static void main(String[] args) {
Application.launch(args);
}
public static Mat detectFace(Mat inputImage) {
MatOfRect facesDetected = new MatOfRect();
CascadeClassifier cascadeClassifier = new CascadeClassifier();
int minFaceSize = Math.round(inputImage.rows() * 0.1f);
cascadeClassifier.load("./src/main/resources/haarcascades/haarcascade_frontalface_alt.xml");
cascadeClassifier.detectMultiScale(inputImage,
facesDetected,
1.1,
3,
Objdetect.CASCADE_SCALE_IMAGE,
new Size(minFaceSize, minFaceSize),
new Size()
);
Rect[] facesArray = facesDetected.toArray();
for(Rect face : facesArray) {
Imgproc.rectangle(inputImage, face.tl(), face.br(), new Scalar(0, 0, 255), 3 );
}
return inputImage;
}
}
image-processing/src/main/java/com/baeldung/imageprocessing/opencv/FaceDetection.java
+56
View File
@@ -0,0 +1,56 @@
package com.baeldung.imageprocessing.opencv;
import org.opencv.core.Mat;
import org.opencv.core.MatOfByte;
import org.opencv.core.MatOfRect;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;
import org.opencv.objdetect.Objdetect;
import javafx.scene.image.Image;
import java.io.ByteArrayInputStream;
public class FaceDetection {
public static Mat loadImage(String imagePath) {
Imgcodecs imageCodecs = new Imgcodecs();
return imageCodecs.imread(imagePath);
}
public static void saveImage(Mat imageMatrix, String targetPath) {
Imgcodecs imgcodecs = new Imgcodecs();
imgcodecs.imwrite(targetPath, imageMatrix);
}
public static void detectFace(String sourceImagePath, String targetImagePath) {
Mat loadedImage = loadImage(sourceImagePath);
MatOfRect facesDetected = new MatOfRect();
CascadeClassifier cascadeClassifier = new CascadeClassifier();
int minFaceSize = Math.round(loadedImage.rows() * 0.1f);
cascadeClassifier.load("./src/main/resources/haarcascades/haarcascade_frontalface_alt.xml");
cascadeClassifier.detectMultiScale(loadedImage,
facesDetected,
1.1,
3,
Objdetect.CASCADE_SCALE_IMAGE,
new Size(minFaceSize, minFaceSize),
new Size()
);
Rect[] facesArray = facesDetected.toArray();
for(Rect face : facesArray) {
Imgproc.rectangle(loadedImage, face.tl(), face.br(), new Scalar(0, 0, 255), 3 );
}
saveImage(loadedImage, targetImagePath);
}
public Image mat2Img(Mat mat) {
MatOfByte bytes = new MatOfByte();
Imgcodecs.imencode("img", mat, bytes);
ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes.toArray());
Image img = new Image(inputStream); return img;
}
}
image-processing/src/main/resources/haarcascades/haarcascade_frontalface_alt.xml
+24350
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File diff suppressed because it is too large Load Diff
java-numbers-3/README.md
+4
View File
@@ -0,0 +1,4 @@
### Relevant Articles:
- [Generating Random Numbers](https://www.baeldung.com/java-generating-random-numbers)
- [Convert Double to Long in Java](https://www.baeldung.com/java-convert-double-long)
json-2/README.md
+1
View File
@@ -3,3 +3,4 @@
This module contains articles about JSON.
### Relevant Articles:
- [Introduction to Jsoniter](https://www.baeldung.com/java-jsoniter)
libraries-2/src/test/java/com/baeldung/handlebars/BuiltinHelperUnitTest.java
+11 -18
View File
@@ -1,15 +1,14 @@
package com.baeldung.handlebars;
import static org.assertj.core.api.Assertions.assertThat;
import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Template;
import com.github.jknack.handlebars.io.ClassPathTemplateLoader;
import com.github.jknack.handlebars.io.TemplateLoader;
import org.junit.Test;
import java.io.IOException;
import org.junit.Ignore;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
/**
* Showcases the built-in template helpers.
@@ -20,7 +19,6 @@ public class BuiltinHelperUnitTest {
private TemplateLoader templateLoader = new ClassPathTemplateLoader("/handlebars", ".html");
@Ignore
@Test
public void whenUsedWith_ThenContextChanges() throws IOException {
Handlebars handlebars = new Handlebars(templateLoader);
@@ -30,10 +28,9 @@ public class BuiltinHelperUnitTest {
String templateString = template.apply(person);
assertThat(templateString).isEqualTo("\n<h4>I live in World</h4>\n");
assertThat(templateString).contains("<h4>I live in World</h4>");
}
@Ignore
@Test
public void whenUsedWithMustacheStyle_ThenContextChanges() throws IOException {
Handlebars handlebars = new Handlebars(templateLoader);
@@ -43,10 +40,9 @@ public class BuiltinHelperUnitTest {
String templateString = template.apply(person);
assertThat(templateString).isEqualTo("\n<h4>I live in World</h4>\n");
assertThat(templateString).contains("<h4>I live in World</h4>");
}
@Ignore
@Test
public void whenUsedEach_ThenIterates() throws IOException {
Handlebars handlebars = new Handlebars(templateLoader);
@@ -59,11 +55,10 @@ public class BuiltinHelperUnitTest {
String templateString = template.apply(person);
assertThat(templateString).isEqualTo("\n<span>Java is my friend.</span>\n"
+ "\n<span>Spring is my friend.</span>\n");
assertThat(templateString)
.contains("<span>Java is my friend.</span>", "<span>Spring is my friend.</span>");
}
@Ignore
@Test
public void whenUsedEachMustacheStyle_ThenIterates() throws IOException {
Handlebars handlebars = new Handlebars(templateLoader);
@@ -76,11 +71,10 @@ public class BuiltinHelperUnitTest {
String templateString = template.apply(person);
assertThat(templateString).isEqualTo("\n<span>Java is my friend.</span>\n"
+ "\n<span>Spring is my friend.</span>\n");
assertThat(templateString)
.contains("<span>Java is my friend.</span>", "<span>Spring is my friend.</span>");
}
@Ignore
@Test
public void whenUsedIf_ThenPutsCondition() throws IOException {
Handlebars handlebars = new Handlebars(templateLoader);
@@ -90,10 +84,9 @@ public class BuiltinHelperUnitTest {
String templateString = template.apply(person);
assertThat(templateString).isEqualTo("\n<h4>Baeldung is busy.</h4>\n");
assertThat(templateString).contains("<h4>Baeldung is busy.</h4>");
}
@Ignore
@Test
public void whenUsedIfMustacheStyle_ThenPutsCondition() throws IOException {
Handlebars handlebars = new Handlebars(templateLoader);
@@ -103,7 +96,7 @@ public class BuiltinHelperUnitTest {
String templateString = template.apply(person);
assertThat(templateString).isEqualTo("\n<h4>Baeldung is busy.</h4>\n");
assertThat(templateString).contains("<h4>Baeldung is busy.</h4>");
}
private Person getPerson(String name) {
libraries-2/src/test/java/com/baeldung/handlebars/ReusingTemplatesUnitTest.java
+11 -13
View File
@@ -1,15 +1,14 @@
package com.baeldung.handlebars;
import static org.assertj.core.api.Assertions.assertThat;
import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Template;
import com.github.jknack.handlebars.io.ClassPathTemplateLoader;
import com.github.jknack.handlebars.io.TemplateLoader;
import org.junit.Test;
import java.io.IOException;
import org.junit.Ignore;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
/**
* Showcases reusing the existing templates.
@@ -20,7 +19,6 @@ public class ReusingTemplatesUnitTest {
private TemplateLoader templateLoader = new ClassPathTemplateLoader("/handlebars", ".html");
@Ignore
@Test
public void whenOtherTemplateIsReferenced_ThenCanReuse() throws IOException {
Handlebars handlebars = new Handlebars(templateLoader);
@@ -30,10 +28,10 @@ public class ReusingTemplatesUnitTest {
String templateString = template.apply(person);
assertThat(templateString).isEqualTo("<h4>Hi Baeldung!</h4>\n<p>This is the page Baeldung</p>");
assertThat(templateString)
.contains("<h4>Hi Baeldung!</h4>", "<p>This is the page Baeldung</p>");
}
@Ignore
@Test
public void whenBlockIsDefined_ThenCanOverrideWithPartial() throws IOException {
Handlebars handlebars = new Handlebars(templateLoader);
@@ -43,11 +41,11 @@ public class ReusingTemplatesUnitTest {
String templateString = template.apply(person);
assertThat(templateString).isEqualTo("\n<html>\n"
+ "<body>\n"
+ "\n This is the intro\n\n"
+ "\n Hi there!\n\n"
+ "</body>\n"
+ "</html>");
assertThat(templateString).contains("<html>",
"<body>",
"This is the intro",
"Hi there!",
"</body>",
"</html>");
}
}
libraries-3/README.md
+2
View File
@@ -9,3 +9,5 @@ Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-m
### Relevant Articles:
- [Parsing Command-Line Parameters with JCommander](https://www.baeldung.com/jcommander-parsing-command-line-parameters)
- [Guide to the Cactoos Library](https://www.baeldung.com/java-cactoos)
- [Parsing Command-Line Parameters with Airline](https://www.baeldung.com/java-airline)
libraries-3/pom.xml
-1
View File
@@ -24,7 +24,6 @@
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
libraries-data-io/src/test/java/com/baeldung/libraries/snakeyaml/MultiLineStringsUnitTest.java
+90
View File
@@ -0,0 +1,90 @@
package com.baeldung.libraries.snakeyaml;
import org.junit.Before;
import org.junit.Test;
import org.yaml.snakeyaml.Yaml;
import java.io.File;
import java.io.InputStream;
import java.util.Map;
import static org.junit.Assert.assertEquals;
public class MultiLineStringsUnitTest {
private Yaml yaml;
@Before
public void setup() {
yaml = new Yaml();
}
@Test
public void whenLiteral_ThenLineBreaksArePresent() {
String key = parseYamlKey("literal.yaml", "key");
assertEquals("Line1\nLine2\nLine3", key);
}
@Test
public void whenLiteral_ThenEndingBreaksAreReducedToOne() {
String key = parseYamlKey("literal2.yaml", "key");
assertEquals("\n\nLine1\n\nLine2\n\nLine3\n", key);
}
@Test
public void whenFolded_ThenLineBreaksAreReplaced() {
String key = parseYamlKey("folded.yaml", "key");
assertEquals("Line1 Line2 Line3", key);
}
@Test
public void whenFolded_ThenEmptyLinesAreReducedToOne() {
String key = parseYamlKey("folded2.yaml", "key");
assertEquals("Line1 Line2\n\nLine3\n", key);
}
@Test
public void whenLiteralKeep_ThenLastEmptyLinesArePresent() {
String key = parseYamlKey("literal_keep.yaml", "key");
assertEquals("Line1\nLine2\nLine3\n\n", key);
}
@Test
public void whenLiteralStrip_ThenLastEmptyLinesAreRemoved() {
String key = parseYamlKey("literal_strip.yaml", "key");
assertEquals("Line1\nLine2\nLine3", key);
}
@Test
public void whenFoldedKeep_ThenLastEmptyLinesArePresent() {
String key = parseYamlKey("folded_keep.yaml", "key");
assertEquals("Line1 Line2 Line3\n\n\n", key);
}
@Test
public void whenFoldedStrip_ThenLastEmptyLinesAreRemoved() {
String key = parseYamlKey("folded_strip.yaml", "key");
assertEquals("Line1 Line2 Line3", key);
}
@Test
public void whenDoubleQuotes_ThenExplicitBreaksArePreserved() {
String key = parseYamlKey("plain_double_quotes.yaml", "key");
assertEquals("Line1\nLine2\nLine3", key);
}
@Test
public void whenSingleQuotes_ThenExplicitBreaksAreIgnored() {
String key = parseYamlKey("plain_single_quotes.yaml", "key");
assertEquals("Line1\\nLine2\nLine3", key);
}
String parseYamlKey(String fileName, String key) {
InputStream inputStream = this.getClass()
.getClassLoader()
.getResourceAsStream("yaml" + File.separator + "multiline" + File.separator + fileName);
Map<String, String> parsed = yaml.load(inputStream);
return parsed.get(key);
}
}
libraries-data-io/src/test/resources/yaml/multiline/folded.yaml
+4
View File
@@ -0,0 +1,4 @@
key: >
Line1
Line2
Line3
libraries-data-io/src/test/resources/yaml/multiline/folded2.yaml
+8
View File
@@ -0,0 +1,8 @@
key: >
Line1
Line2
Line3
libraries-data-io/src/test/resources/yaml/multiline/folded_keep.yaml
+6
View File
@@ -0,0 +1,6 @@
key: >+
Line1
Line2
Line3
libraries-data-io/src/test/resources/yaml/multiline/folded_strip.yaml
+7
View File
@@ -0,0 +1,7 @@
key: >-
Line1
Line2
Line3
libraries-data-io/src/test/resources/yaml/multiline/literal.yaml
+4
View File
@@ -0,0 +1,4 @@
key: |
Line1
Line2
Line3
libraries-data-io/src/test/resources/yaml/multiline/literal2.yaml
+10
View File
@@ -0,0 +1,10 @@
key: |
Line1
Line2
Line3
libraries-data-io/src/test/resources/yaml/multiline/literal_keep.yaml
+5
View File
@@ -0,0 +1,5 @@
key: |+
Line1
Line2
Line3
libraries-data-io/src/test/resources/yaml/multiline/literal_strip.yaml
+5
View File
@@ -0,0 +1,5 @@
key: |-
Line1
Line2
Line3
libraries-data-io/src/test/resources/yaml/multiline/plain_double_quotes.yaml
+1
View File
@@ -0,0 +1 @@
key: "Line1\nLine2\nLine3"
libraries-data-io/src/test/resources/yaml/multiline/plain_single_quotes.yaml
+3
View File
@@ -0,0 +1,3 @@
key: 'Line1\nLine2
Line3'
libraries-http/README.md
+1
View File
@@ -13,3 +13,4 @@ This module contains articles about HTTP libraries.
- [A Guide to Unirest](https://www.baeldung.com/unirest)
- [Creating REST Microservices with Javalin](https://www.baeldung.com/javalin-rest-microservices)
- [A Quick Guide to Timeouts in OkHttp](https://www.baeldung.com/okhttp-timeouts)
- [A Quick Guide to Post Requests with OkHttp](https://www.baeldung.com/okhttp-post)
logging-modules/logback/README.md
+1
View File
@@ -2,3 +2,4 @@
- [Get Log Output in JSON](https://www.baeldung.com/java-log-json-output)
- [SLF4J Warning: Class Path Contains Multiple SLF4J Bindings](https://www.baeldung.com/slf4j-classpath-multiple-bindings)
- [Sending Emails with Logback](https://www.baeldung.com/logback-send-email)
maven-all/maven/proxy/README.md
+3
View File
@@ -0,0 +1,3 @@
### Relevant Articles:
- [Using Maven Behind a Proxy](https://www.baeldung.com/maven-behind-proxy)
ninja/README.md
+3
View File
@@ -0,0 +1,3 @@
### Relevant Articles
- [Introduction to Ninja Framework](https://www.baeldung.com/ninja-framework-intro)
parent-spring-4/pom.xml
+1 -1
View File
@@ -51,7 +51,7 @@
</build>
<properties>
<spring.version>4.3.25.RELEASE</spring.version>
<spring.version>4.3.26.RELEASE</spring.version>
<cargo-maven2-plugin.version>1.6.1</cargo-maven2-plugin.version>
</properties>
persistence-modules/hbase/README.md
+1 -1
View File
@@ -1,3 +1,3 @@
### Relevant articles
- [HBase with Java](http://www.baeldung.com/hbase)
- [HBase with Java](https://www.baeldung.com/hbase)
persistence-modules/hbase/src/main/java/org/baeldung/hbase/HBaseClientOperations.java → persistence-modules/hbase/src/main/java/com/baeldung/hbase/HBaseClientOperations.java
+1 -1
View File
@@ -1,4 +1,4 @@
package org.baeldung.hbase;
package com.baeldung.hbase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HColumnDescriptor;
persistence-modules/hbase/src/main/java/org/baeldung/hbase/HbaseClientExample.java → persistence-modules/hbase/src/main/java/com/baeldung/hbase/HbaseClientExample.java
+1 -1
View File
@@ -1,4 +1,4 @@
package org.baeldung.hbase;
package com.baeldung.hbase;
import com.google.protobuf.ServiceException;
persistence-modules/hibernate5-2/README.md
+1
View File
@@ -7,4 +7,5 @@ This module contains articles about Hibernate 5.
- [FetchMode in Spring Data JPA](https://www.baeldung.com/spring-data-jpa-fetchmode)
- [JPA/Hibernate Persistence Context](https://www.baeldung.com/jpa-hibernate-persistence-context)
- [FetchMode in Hibernate](https://www.baeldung.com/hibernate-fetchmode)
- [Various Logging Levels in Hibernate](https://www.baeldung.com/hibernate-logging-levels)
- [[<-- Prev]](/hibernate5)
persistence-modules/java-mongodb/src/test/java/com/baeldung/aggregation/AggregationLiveTest.java
+111 -111
View File
@@ -1,111 +1,111 @@
package com.baeldung.aggregation;
import static com.mongodb.client.model.Aggregates.count;
import static com.mongodb.client.model.Aggregates.group;
import static com.mongodb.client.model.Aggregates.limit;
import static com.mongodb.client.model.Aggregates.match;
import static com.mongodb.client.model.Aggregates.out;
import static com.mongodb.client.model.Aggregates.project;
import static com.mongodb.client.model.Aggregates.sort;
import static org.junit.Assert.assertTrue;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Accumulators;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Projections;
import com.mongodb.client.model.Sorts;
public class AggregationLiveTest {
private static final String DATABASE = "world";
private static final String COLLECTION = "countries";
private static final String DATASET_JSON = "/countrydata.json";
private static MongoClient mongoClient;
private static MongoDatabase database;
private static MongoCollection<Document> collection;
@BeforeClass
public static void setUpDB() throws IOException {
mongoClient = MongoClients.create();
database = mongoClient.getDatabase(DATABASE);
collection = database.getCollection(COLLECTION);
collection.drop();
InputStream is = AggregationLiveTest.class.getResourceAsStream(DATASET_JSON);
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
reader.lines()
.forEach(line -> collection.insertOne(Document.parse(line)));
reader.close();
}
@Test
public void givenCountryCollection_whenNAFTACountriesCounted_thenThree() {
Document naftaCountries = collection.aggregate(Arrays.asList(match(Filters.eq("regionalBlocs.acronym", "NAFTA")), count()))
.first();
assertEquals(3, naftaCountries.get("count"));
}
@Test
public void givenCountryCollection_whenAreaSortedDescending_thenSuccess() {
collection.aggregate(Arrays.asList(sort(Sorts.descending("area")), limit(7), out("largest_seven")))
.toCollection();
MongoCollection<Document> largestSeven = database.getCollection("largest_seven");
assertEquals(7, largestSeven.countDocuments());
Document usa = largestSeven.find(Filters.eq("alpha3Code", "USA"))
.first();
assertNotNull(usa);
}
@Test
public void givenCountryCollection_whenCountedRegionWise_thenMaxInAfrica() {
Document maxCountriedRegion = collection.aggregate(Arrays.asList(group("$region", Accumulators.sum("tally", 1)), sort(Sorts.descending("tally"))))
.first();
assertTrue(maxCountriedRegion.containsValue("Africa"));
}
@Test
public void givenCountryCollection_whenNeighborsCalculated_thenMaxIsFifteenInChina() {
Bson borderingCountriesCollection = project(Projections.fields(Projections.excludeId(), Projections.include("name"), Projections.computed("borderingCountries", Projections.computed("$size", "$borders"))));
int maxValue = collection.aggregate(Arrays.asList(borderingCountriesCollection, group(null, Accumulators.max("max", "$borderingCountries"))))
.first()
.getInteger("max");
assertEquals(15, maxValue);
Document maxNeighboredCountry = collection.aggregate(Arrays.asList(borderingCountriesCollection, match(Filters.eq("borderingCountries", maxValue))))
.first();
assertTrue(maxNeighboredCountry.containsValue("China"));
}
@AfterClass
public static void cleanUp() {
mongoClient.close();
}
}
package com.baeldung.aggregation;
import static com.mongodb.client.model.Aggregates.count;
import static com.mongodb.client.model.Aggregates.group;
import static com.mongodb.client.model.Aggregates.limit;
import static com.mongodb.client.model.Aggregates.match;
import static com.mongodb.client.model.Aggregates.out;
import static com.mongodb.client.model.Aggregates.project;
import static com.mongodb.client.model.Aggregates.sort;
import static org.junit.Assert.assertTrue;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Accumulators;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Projections;
import com.mongodb.client.model.Sorts;
public class AggregationLiveTest {
private static final String DATABASE = "world";
private static final String COLLECTION = "countries";
private static final String DATASET_JSON = "/countrydata.json";
private static MongoClient mongoClient;
private static MongoDatabase database;
private static MongoCollection<Document> collection;
@BeforeClass
public static void setUpDB() throws IOException {
mongoClient = MongoClients.create();
database = mongoClient.getDatabase(DATABASE);
collection = database.getCollection(COLLECTION);
collection.drop();
InputStream is = AggregationLiveTest.class.getResourceAsStream(DATASET_JSON);
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
reader.lines()
.forEach(line -> collection.insertOne(Document.parse(line)));
reader.close();
}
@Test
public void givenCountryCollection_whenEnglishSpeakingCountriesCounted_thenNinetyOne() {
Document englishSpeakingCountries = collection.aggregate(Arrays.asList(match(Filters.eq("languages.name", "English")), count()))
.first();
assertEquals(91, englishSpeakingCountries.get("count"));
}
@Test
public void givenCountryCollection_whenAreaSortedDescending_thenSuccess() {
collection.aggregate(Arrays.asList(sort(Sorts.descending("area")), limit(7), out("largest_seven")))
.toCollection();
MongoCollection<Document> largestSeven = database.getCollection("largest_seven");
assertEquals(7, largestSeven.countDocuments());
Document usa = largestSeven.find(Filters.eq("alpha3Code", "USA"))
.first();
assertNotNull(usa);
}
@Test
public void givenCountryCollection_whenCountedRegionWise_thenMaxInAfrica() {
Document maxCountriedRegion = collection.aggregate(Arrays.asList(group("$region", Accumulators.sum("tally", 1)), sort(Sorts.descending("tally"))))
.first();
assertTrue(maxCountriedRegion.containsValue("Africa"));
}
@Test
public void givenCountryCollection_whenNeighborsCalculated_thenMaxIsFifteenInChina() {
Bson borderingCountriesCollection = project(Projections.fields(Projections.excludeId(), Projections.include("name"), Projections.computed("borderingCountries", Projections.computed("$size", "$borders"))));
int maxValue = collection.aggregate(Arrays.asList(borderingCountriesCollection, group(null, Accumulators.max("max", "$borderingCountries"))))
.first()
.getInteger("max");
assertEquals(15, maxValue);
Document maxNeighboredCountry = collection.aggregate(Arrays.asList(borderingCountriesCollection, match(Filters.eq("borderingCountries", maxValue))))
.first();
assertTrue(maxNeighboredCountry.containsValue("China"));
}
@AfterClass
public static void cleanUp() {
mongoClient.close();
}
}
persistence-modules/querydsl/README.md
+2 -2
View File
@@ -1,3 +1,3 @@
### Relevant Articles:
- [Intro to Querydsl](http://www.baeldung.com/intro-to-querydsl)
- [A Guide to Querydsl with JPA](http://www.baeldung.com/querydsl-with-jpa-tutorial)
- [Intro to Querydsl](https://www.baeldung.com/intro-to-querydsl)
- [A Guide to Querydsl with JPA](https://www.baeldung.com/querydsl-with-jpa-tutorial)
persistence-modules/querydsl/src/main/java/org/baeldung/dao/PersonDao.java → persistence-modules/querydsl/src/main/java/com/baeldung/dao/PersonDao.java
+2 -2
View File
@@ -1,9 +1,9 @@
package org.baeldung.dao;
package com.baeldung.dao;
import java.util.List;
import java.util.Map;
import org.baeldung.entity.Person;
import com.baeldung.entity.Person;
public interface PersonDao {
persistence-modules/querydsl/src/main/java/org/baeldung/dao/PersonDaoImpl.java → persistence-modules/querydsl/src/main/java/com/baeldung/dao/PersonDaoImpl.java
+8 -10
View File
@@ -1,17 +1,15 @@
package org.baeldung.dao;
package com.baeldung.dao;
import java.util.List;
import java.util.Map;
import com.baeldung.entity.Person;
import com.baeldung.entity.QPerson;
import com.querydsl.core.group.GroupBy;
import com.querydsl.jpa.impl.JPAQuery;
import org.springframework.stereotype.Repository;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.baeldung.entity.Person;
import org.baeldung.entity.QPerson;
import org.springframework.stereotype.Repository;
import com.querydsl.core.group.GroupBy;
import com.querydsl.jpa.impl.JPAQuery;
import java.util.List;
import java.util.Map;
@Repository
public class PersonDaoImpl implements PersonDao {
persistence-modules/querydsl/src/main/java/org/baeldung/entity/Person.java → persistence-modules/querydsl/src/main/java/com/baeldung/entity/Person.java
+1 -1
View File
@@ -1,4 +1,4 @@
package org.baeldung.entity;
package com.baeldung.entity;
import javax.persistence.Column;
import javax.persistence.Entity;
persistence-modules/querydsl/src/main/java/org/baeldung/querydsl/intro/entities/BlogPost.java → persistence-modules/querydsl/src/main/java/com/baeldung/querydsl/intro/entities/BlogPost.java
+1 -1
View File
@@ -1,7 +1,7 @@
/*
* (c) Центр ИТ, 2016. Все права защищены.
*/
package org.baeldung.querydsl.intro.entities;
package com.baeldung.querydsl.intro.entities;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
persistence-modules/querydsl/src/main/java/org/baeldung/querydsl/intro/entities/User.java → persistence-modules/querydsl/src/main/java/com/baeldung/querydsl/intro/entities/User.java
+1 -1
View File
@@ -1,7 +1,7 @@
/*
* (c) Центр ИТ, 2016. Все права защищены.
*/
package org.baeldung.querydsl.intro.entities;
package com.baeldung.querydsl.intro.entities;
import java.util.HashSet;
import java.util.Set;
persistence-modules/querydsl/src/main/resources/META-INF/persistence.xml
+1 -1
View File
@@ -17,7 +17,7 @@
</persistence-unit>
<!-- PersistenceUnit for Intro to QueryDSL -->
<persistence-unit name="org.baeldung.querydsl.intro">
<persistence-unit name="com.baeldung.querydsl.intro">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
persistence-modules/querydsl/src/test/java/org/baeldung/dao/PersonDaoIntegrationTest.java → persistence-modules/querydsl/src/test/java/com/baeldung/dao/PersonDaoIntegrationTest.java
+2 -2
View File
@@ -1,8 +1,8 @@
package org.baeldung.dao;
package com.baeldung.dao;
import java.util.Map;
import org.baeldung.entity.Person;
import com.baeldung.entity.Person;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
persistence-modules/querydsl/src/test/java/org/baeldung/querydsl/intro/QueryDSLIntegrationTest.java → persistence-modules/querydsl/src/test/java/com/baeldung/querydsl/intro/QueryDSLIntegrationTest.java
+6 -6
View File
@@ -1,17 +1,17 @@
/*
* (c) Центр ИТ, 2016. Все права защищены.
*/
package org.baeldung.querydsl.intro;
package com.baeldung.querydsl.intro;
import com.baeldung.querydsl.intro.entities.BlogPost;
import com.baeldung.querydsl.intro.entities.QBlogPost;
import com.baeldung.querydsl.intro.entities.QUser;
import com.baeldung.querydsl.intro.entities.User;
import com.querydsl.core.Tuple;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.core.types.dsl.NumberPath;
import com.querydsl.jpa.JPAExpressions;
import com.querydsl.jpa.impl.JPAQueryFactory;
import org.baeldung.querydsl.intro.entities.BlogPost;
import org.baeldung.querydsl.intro.entities.QBlogPost;
import org.baeldung.querydsl.intro.entities.QUser;
import org.baeldung.querydsl.intro.entities.User;
import org.junit.*;
import javax.persistence.EntityManager;
@@ -31,7 +31,7 @@ public class QueryDSLIntegrationTest {
@BeforeClass
public static void populateDatabase() {
emf = Persistence.createEntityManagerFactory("org.baeldung.querydsl.intro");
emf = Persistence.createEntityManagerFactory("com.baeldung.querydsl.intro");
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();

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