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Merge pull request #1 from eugenp/master

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Updated
This commit is contained in:
sergio41
2020-04-10 19:40:18 +02:00
committed by GitHub
parent eeb864af71 282a09d94d
commit d055188d60
3898 changed files with 68803 additions and 40348 deletions
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.gitignore
+1 -2
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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
@@ -72,8 +73,6 @@ jmeter/src/main/resources/*-JMeter.csv
**/out-tsc
**/nbproject/
**/nb-configuration.xml
core-scala/.cache-main
core-scala/.cache-tests
persistence-modules/hibernate5/transaction.log
README.md
+41 -3
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@@ -22,10 +22,38 @@ This project is **a collection of small and focused tutorials** - each covering
A strong focus of these is, of course, the Spring Framework - Spring, Spring Boot and Spring Security.
In additional to Spring, the modules here are covering a number of aspects in Java.
Profile based segregation
====================
We are using maven build profiles to segregate the huge list of individual projects we have in our repository.
The projects are broadly divided into 3 list: first, second and heavy.
Next, they are segregated further on the basis of tests that we want to execute.
Therefore, we have a total of 6 profiles:
| Profile | Includes | Type of test enabled |
| ----------------------- | --------------------------- | -------------------- |
| default-first | First set of projects | *UnitTest |
| integration-lite-first | First set of projects | *IntegrationTest |
| default-second | Second set of projects | *UnitTest |
| integration-lite-second | Second set of projects | *IntegrationTest |
| default-heavy | Heavy/long running projects | *UnitTest |
| integration-heavy | Heavy/long running projects | *IntegrationTest |
Building the project
====================
To do the full build, do: `mvn clean install`
Though it should not be needed often to build the entire repository at once because we are usually concerned with a specific module.
But if we want to, we can invoke the below command from the root of the repository if we want to build the entire repository with only Unit Tests enabled:
`mvn clean install -Pdefault-first,default-second,default-heavy`
or if we want to build the entire repository with Integration Tests enabled, we can do:
`mvn clean install -Pintegration-lite-first,integration-lite-second,integration-heavy`
Building a single module
@@ -46,8 +74,18 @@ When you're working with an individual module, there's no need to import all of
Running Tests
=============
The command `mvn clean install` will run the unit tests in a module.
To run the integration tests, use the command `mvn clean install -Pintegration-lite-first`
The command `mvn clean install` from within a module will run the unit tests in that module.
For Spring modules this will also run the `SpringContextTest` if present.
To run the integration tests, use the command:
`mvn clean install -Pintegration-lite-first` or
`mvn clean install -Pintegration-lite-second` or
`mvn clean install -Pintegration-heavy`
depending on the list where our module exists
akka-http/pom.xml
+4 -3
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@@ -1,7 +1,8 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<project
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<artifactId>akka-http</artifactId>
<name>akka-http</name>
akka-http/src/test/java/com/baeldung/akkahttp/UserServerUnitTest.java
+5 -2
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@@ -7,6 +7,8 @@ import akka.http.javadsl.model.HttpEntities;
import akka.http.javadsl.model.HttpRequest;
import akka.http.javadsl.testkit.JUnitRouteTest;
import akka.http.javadsl.testkit.TestRoute;
import org.junit.Ignore;
import org.junit.Test;
public class UserServerUnitTest extends JUnitRouteTest {
@@ -17,6 +19,7 @@ public class UserServerUnitTest extends JUnitRouteTest {
TestRoute appRoute = testRoute(new UserServer(userActorRef).routes());
@Ignore
@Test
public void whenRequest_thenActorResponds() {
@@ -28,10 +31,10 @@ public class UserServerUnitTest extends JUnitRouteTest {
.assertStatusCode(404);
appRoute.run(HttpRequest.DELETE("/users/1"))
.assertStatusCode(200);
.assertStatusCode(405);
appRoute.run(HttpRequest.DELETE("/users/42"))
.assertStatusCode(200);
.assertStatusCode(405);
appRoute.run(HttpRequest.POST("/users")
.withEntity(HttpEntities.create(ContentTypes.APPLICATION_JSON, zaphod())))
akka-streams/pom.xml
+4 -2
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@@ -1,6 +1,8 @@
<?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>akka-streams</artifactId>
<name>akka-streams</name>
algorithms-genetic/pom.xml
+4 -2
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@@ -1,6 +1,8 @@
<?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>algorithms-genetic</artifactId>
<version>0.0.1-SNAPSHOT</version>
algorithms-miscellaneous-1/pom.xml
+6 -3
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@@ -1,6 +1,8 @@
<?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>algorithms-miscellaneous-1</artifactId>
<version>0.0.1-SNAPSHOT</version>
@@ -64,7 +66,7 @@
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>cobertura-maven-plugin</artifactId>
<version>2.7</version>
<version>${cobertura.plugin.version}</version>
<configuration>
<instrumentation>
<ignores>
@@ -85,6 +87,7 @@
<commons-codec.version>1.11</commons-codec.version>
<guava.version>27.0.1-jre</guava.version>
<combinatoricslib3.version>3.3.0</combinatoricslib3.version>
<cobertura.plugin.version>2.7</cobertura.plugin.version>
</properties>
</project>
algorithms-miscellaneous-2/README.md
+1
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@@ -13,4 +13,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Create a Sudoku Solver in Java](https://www.baeldung.com/java-sudoku)
- [Displaying Money Amounts in Words](https://www.baeldung.com/java-money-into-words)
- [A Collaborative Filtering Recommendation System in Java](https://www.baeldung.com/java-collaborative-filtering-recommendations)
- [Implementing A* Pathfinding in Java](https://www.baeldung.com/java-a-star-pathfinding)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-1) [[next -->]](/../algorithms-miscellaneous-3)
algorithms-miscellaneous-2/pom.xml
+4 -2
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@@ -1,6 +1,8 @@
<?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>algorithms-miscellaneous-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/slope_one/SlopeOne.java
+1 -1
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@@ -98,7 +98,7 @@ public class SlopeOne {
for (Item j : InputData.items) {
if (e.getValue().containsKey(j)) {
clean.put(j, e.getValue().get(j));
} else {
} else if (!clean.containsKey(j)) {
clean.put(j, -1.0);
}
}
algorithms-miscellaneous-3/README.md
-1
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@@ -13,6 +13,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Checking if a Java Graph has a Cycle](https://www.baeldung.com/java-graph-has-a-cycle)
- [A Guide to the Folding Technique in Java](https://www.baeldung.com/folding-hashing-technique)
- [Creating a Triangle with for Loops in Java](https://www.baeldung.com/java-print-triangle)
- [Efficient Word Frequency Calculator in Java](https://www.baeldung.com/java-word-frequency)
- [The K-Means Clustering Algorithm in Java](https://www.baeldung.com/java-k-means-clustering-algorithm)
- More articles: [[<-- prev]](/algorithms-miscellaneous-2) [[next -->]](/algorithms-miscellaneous-4)
algorithms-miscellaneous-3/pom.xml
+8 -4
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@@ -1,6 +1,8 @@
<?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>algorithms-miscellaneous-3</artifactId>
<version>0.0.1-SNAPSHOT</version>
@@ -46,13 +48,13 @@
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.8.1</version>
<version>${commons.lang3.version}</version>
</dependency>
<dependency>
<groupId>pl.pragmatists</groupId>
<artifactId>JUnitParams</artifactId>
<version>1.1.0</version>
<version>${JUnitParams.version}</version>
<scope>test</scope>
</dependency>
<dependency>
@@ -91,6 +93,8 @@
<retrofit.version>2.6.0</retrofit.version>
<jmh-core.version>1.19</jmh-core.version>
<jmh-generator.version>1.19</jmh-generator.version>
<commons.lang3.version>3.8.1</commons.lang3.version>
<JUnitParams.version>1.1.0</JUnitParams.version>
</properties>
</project>
algorithms-miscellaneous-4/pom.xml
+4 -2
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@@ -1,6 +1,8 @@
<?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>algorithms-miscellaneous-4</artifactId>
<version>0.0.1-SNAPSHOT</version>
algorithms-miscellaneous-5/README.md
+9 -1
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@@ -10,6 +10,14 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Find If Two Numbers Are Relatively Prime in Java](https://www.baeldung.com/java-two-relatively-prime-numbers)
- [Knapsack Problem Implementation in Java](https://www.baeldung.com/java-knapsack)
- [How to Determine if a Binary Tree is Balanced](https://www.baeldung.com/java-balanced-binary-tree)
- [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)
- [The Caesar Cipher in Java](https://www.baeldung.com/java-caesar-cipher)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-4)
algorithms-miscellaneous-5/pom.xml
+12 -3
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@@ -1,6 +1,8 @@
<?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>algorithms-miscellaneous-5</artifactId>
<version>0.0.1-SNAPSHOT</version>
@@ -37,7 +39,12 @@
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>28.1-jre</version>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-commons</artifactId>
<version>${junit.platform.version}</version>
</dependency>
<dependency>
@@ -65,6 +72,8 @@
<org.assertj.core.version>3.9.0</org.assertj.core.version>
<commons-codec.version>1.11</commons-codec.version>
<commons-math3.version>3.6.1</commons-math3.version>
<guava.version>28.1-jre</guava.version>
<junit.platform.version>1.6.0</junit.platform.version>
</properties>
</project>
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingDeque.java
+36
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@@ -0,0 +1,36 @@
package com.baeldung.algorithms.balancedbrackets;
import java.util.Deque;
import java.util.LinkedList;
public class BalancedBracketsUsingDeque {
public boolean isBalanced(String str) {
if (null == str || ((str.length() % 2) != 0)) {
return false;
} else {
char[] ch = str.toCharArray();
for (char c : ch) {
if (!(c == '{' || c == '[' || c == '(' || c == '}' || c == ']' || c == ')')) {
return false;
}
}
}
Deque<Character> deque = new LinkedList<>();
for (char ch : str.toCharArray()) {
if (ch == '{' || ch == '[' || ch == '(') {
deque.addFirst(ch);
} else {
if (!deque.isEmpty() && ((deque.peekFirst() == '{' && ch == '}') || (deque.peekFirst() == '[' && ch == ']') || (deque.peekFirst() == '(' && ch == ')'))) {
deque.removeFirst();
} else {
return false;
}
}
}
return true;
}
}
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingString.java
+27
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@@ -0,0 +1,27 @@
package com.baeldung.algorithms.balancedbrackets;
public class BalancedBracketsUsingString {
public boolean isBalanced(String str) {
if (null == str || ((str.length() % 2) != 0)) {
return false;
} else {
char[] ch = str.toCharArray();
for (char c : ch) {
if (!(c == '{' || c == '[' || c == '(' || c == '}' || c == ']' || c == ')')) {
return false;
}
}
}
while (str.contains("()") || str.contains("[]") || str.contains("{}")) {
str = str.replaceAll("\\(\\)", "")
.replaceAll("\\[\\]", "")
.replaceAll("\\{\\}", "");
}
return (str.length() == 0);
}
}
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingDequeUnitTest.java
+76
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@@ -0,0 +1,76 @@
package com.baeldung.algorithms.balancedbrackets;
import org.junit.Before;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
public class BalancedBracketsUsingDequeUnitTest {
private BalancedBracketsUsingDeque balancedBracketsUsingDeque;
@Before
public void setup() {
balancedBracketsUsingDeque = new BalancedBracketsUsingDeque();
}
@Test
public void givenNullInput_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingDeque.isBalanced(null);
assertThat(result).isFalse();
}
@Test
public void givenEmptyString_whenCheckingForBalance_shouldReturnTrue() {
boolean result = balancedBracketsUsingDeque.isBalanced("");
assertThat(result).isTrue();
}
@Test
public void givenInvalidCharacterString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingDeque.isBalanced("abc[](){}");
assertThat(result).isFalse();
}
@Test
public void givenOddLengthString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingDeque.isBalanced("{{[]()}}}");
assertThat(result).isFalse();
}
@Test
public void givenEvenLengthString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingDeque.isBalanced("{{[]()}}}}");
assertThat(result).isFalse();
}
@Test
public void givenEvenLengthUnbalancedString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingDeque.isBalanced("{[(])}");
assertThat(result).isFalse();
}
@Test
public void givenEvenLengthBalancedString_whenCheckingForBalance_shouldReturnTrue() {
boolean result = balancedBracketsUsingDeque.isBalanced("{[()]}");
assertThat(result).isTrue();
}
@Test
public void givenBalancedString_whenCheckingForBalance_shouldReturnTrue() {
boolean result = balancedBracketsUsingDeque.isBalanced("{{[[(())]]}}");
assertThat(result).isTrue();
}
@Test
public void givenAnotherBalancedString_whenCheckingForBalance_shouldReturnTrue() {
boolean result = balancedBracketsUsingDeque.isBalanced("{{([])}}");
assertThat(result).isTrue();
}
@Test
public void givenUnBalancedString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingDeque.isBalanced("{{)[](}}");
assertThat(result).isFalse();
}
}
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingStringUnitTest.java
+76
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@@ -0,0 +1,76 @@
package com.baeldung.algorithms.balancedbrackets;
import org.junit.Before;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
public class BalancedBracketsUsingStringUnitTest {
private BalancedBracketsUsingString balancedBracketsUsingString;
@Before
public void setup() {
balancedBracketsUsingString = new BalancedBracketsUsingString();
}
@Test
public void givenNullInput_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingString.isBalanced(null);
assertThat(result).isFalse();
}
@Test
public void givenEmptyString_whenCheckingForBalance_shouldReturnTrue() {
boolean result = balancedBracketsUsingString.isBalanced("");
assertThat(result).isTrue();
}
@Test
public void givenInvalidCharacterString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingString.isBalanced("abc[](){}");
assertThat(result).isFalse();
}
@Test
public void givenOddLengthString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingString.isBalanced("{{[]()}}}");
assertThat(result).isFalse();
}
@Test
public void givenEvenLengthString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingString.isBalanced("{{[]()}}}}");
assertThat(result).isFalse();
}
@Test
public void givenEvenLengthUnbalancedString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingString.isBalanced("{[(])}");
assertThat(result).isFalse();
}
@Test
public void givenEvenLengthBalancedString_whenCheckingForBalance_shouldReturnTrue() {
boolean result = balancedBracketsUsingString.isBalanced("{[()]}");
assertThat(result).isTrue();
}
@Test
public void givenBalancedString_whenCheckingForBalance_shouldReturnTrue() {
boolean result = balancedBracketsUsingString.isBalanced("{{[[(())]]}}");
assertThat(result).isTrue();
}
@Test
public void givenAnotherBalancedString_whenCheckingForBalance_shouldReturnTrue() {
boolean result = balancedBracketsUsingString.isBalanced("{{([])}}");
assertThat(result).isTrue();
}
@Test
public void givenUnBalancedString_whenCheckingForBalance_shouldReturnFalse() {
boolean result = balancedBracketsUsingString.isBalanced("{{)[](}}");
assertThat(result).isFalse();
}
}
algorithms-miscellaneous-5/src/test/resources/input.json
+41
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@@ -0,0 +1,41 @@
{
"nodes": 5,
"edges": 7,
"edgeList": [
{
"first": 0,
"second": 1,
"weight": 8
},
{
"first": 0,
"second": 2,
"weight": 5
},
{
"first": 1,
"second": 2,
"weight": 9
},
{
"first": 1,
"second": 3,
"weight": 11
},
{
"first": 2,
"second": 3,
"weight": 15
},
{
"first": 2,
"second": 4,
"weight": 10
},
{
"first": 3,
"second": 4,
"weight": 7
}
]
}
algorithms-miscellaneous-6/pom.xml
+27
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@@ -0,0 +1,27 @@
<?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>
<artifactId>algorithms-miscellaneous-6</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>algorithms-miscellaneous-6</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
</dependencies>
<properties>
<guava.version>28.1-jre</guava.version>
</properties>
</project>
algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/boruvka/BoruvkaMST.java
+84
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@@ -0,0 +1,84 @@
package com.baeldung.algorithms.boruvka;
import com.google.common.graph.EndpointPair;
import com.google.common.graph.MutableValueGraph;
import com.google.common.graph.ValueGraphBuilder;
public class BoruvkaMST {
private static MutableValueGraph<Integer, Integer> mst = ValueGraphBuilder.undirected()
.build();
private static int totalWeight;
public BoruvkaMST(MutableValueGraph<Integer, Integer> graph) {
int size = graph.nodes().size();
UnionFind uf = new UnionFind(size);
// repeat at most log N times or until we have N-1 edges
for (int t = 1; t < size && mst.edges().size() < size - 1; t = t + t) {
EndpointPair<Integer>[] closestEdgeArray = new EndpointPair[size];
// foreach tree in graph, find closest edge
for (EndpointPair<Integer> edge : graph.edges()) {
int u = edge.nodeU();
int v = edge.nodeV();
int uParent = uf.find(u);
int vParent = uf.find(v);
if (uParent == vParent) {
continue; // same tree
}
int weight = graph.edgeValueOrDefault(u, v, 0);
if (closestEdgeArray[uParent] == null) {
closestEdgeArray[uParent] = edge;
}
if (closestEdgeArray[vParent] == null) {
closestEdgeArray[vParent] = edge;
}
int uParentWeight = graph.edgeValueOrDefault(closestEdgeArray[uParent].nodeU(), closestEdgeArray[uParent].nodeV(), 0);
int vParentWeight = graph.edgeValueOrDefault(closestEdgeArray[vParent].nodeU(), closestEdgeArray[vParent].nodeV(), 0);
if (weight < uParentWeight) {
closestEdgeArray[uParent] = edge;
}
if (weight < vParentWeight) {
closestEdgeArray[vParent] = edge;
}
}
// add newly discovered edges to MST
for (int i = 0; i < size; i++) {
EndpointPair<Integer> edge = closestEdgeArray[i];
if (edge != null) {
int u = edge.nodeU();
int v = edge.nodeV();
int weight = graph.edgeValueOrDefault(u, v, 0);
// don't add the same edge twice
if (uf.find(u) != uf.find(v)) {
mst.putEdgeValue(u, v, weight);
totalWeight += weight;
uf.union(u, v);
}
}
}
}
}
public MutableValueGraph<Integer, Integer> getMST() {
return mst;
}
public int getTotalWeight() {
return totalWeight;
}
public String toString() {
return "MST: " + mst.toString() + " | Total Weight: " + totalWeight;
}
}
algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/boruvka/UnionFind.java
+39
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@@ -0,0 +1,39 @@
package com.baeldung.algorithms.boruvka;
public class UnionFind {
private int[] parents;
private int[] ranks;
public UnionFind(int n) {
parents = new int[n];
ranks = new int[n];
for (int i = 0; i < n; i++) {
parents[i] = i;
ranks[i] = 0;
}
}
public int find(int u) {
while (u != parents[u]) {
u = parents[u];
}
return u;
}
public void union(int u, int v) {
int uParent = find(u);
int vParent = find(v);
if (uParent == vParent) {
return;
}
if (ranks[uParent] < ranks[vParent]) {
parents[uParent] = vParent;
} else if (ranks[uParent] > ranks[vParent]) {
parents[vParent] = uParent;
} else {
parents[vParent] = uParent;
ranks[uParent]++;
}
}
}
algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/gradientdescent/GradientDescent.java
+33
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@@ -0,0 +1,33 @@
package com.baeldung.algorithms.gradientdescent;
import java.util.function.Function;
public class GradientDescent {
private final double precision = 0.000001;
public double findLocalMinimum(Function<Double, Double> f, double initialX) {
double stepCoefficient = 0.1;
double previousStep = 1.0;
double currentX = initialX;
double previousX = initialX;
double previousY = f.apply(previousX);
int iter = 100;
currentX += stepCoefficient * previousY;
while (previousStep > precision && iter > 0) {
iter--;
double currentY = f.apply(currentX);
if (currentY > previousY) {
stepCoefficient = -stepCoefficient / 2;
}
previousX = currentX;
currentX += stepCoefficient * previousY;
previousY = currentY;
previousStep = StrictMath.abs(currentX - previousX);
}
return currentX;
}
}
algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/boruvka/BoruvkaUnitTest.java
+37
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@@ -0,0 +1,37 @@
package com.baeldung.algorithms.boruvka;
import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.Before;
import org.junit.Test;
import com.google.common.graph.MutableValueGraph;
import com.google.common.graph.ValueGraphBuilder;
public class BoruvkaUnitTest {
private MutableValueGraph<Integer, Integer> graph;
@Before
public void setup() {
graph = ValueGraphBuilder.undirected()
.build();
graph.putEdgeValue(0, 1, 8);
graph.putEdgeValue(0, 2, 5);
graph.putEdgeValue(1, 2, 9);
graph.putEdgeValue(1, 3, 11);
graph.putEdgeValue(2, 3, 15);
graph.putEdgeValue(2, 4, 10);
graph.putEdgeValue(3, 4, 7);
}
@Test
public void givenInputGraph_whenBoruvkaPerformed_thenMinimumSpanningTree() {
BoruvkaMST boruvkaMST = new BoruvkaMST(graph);
MutableValueGraph<Integer, Integer> mst = boruvkaMST.getMST();
assertEquals(30, boruvkaMST.getTotalWeight());
assertEquals(4, mst.edges().size());
}
}
algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/gradientdescent/GradientDescentUnitTest.java
+20
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@@ -0,0 +1,20 @@
package com.baeldung.algorithms.gradientdescent;
import static org.junit.Assert.assertTrue;
import java.util.function.Function;
import org.junit.Test;
public class GradientDescentUnitTest {
@Test
public void givenFunction_whenStartingPointIsOne_thenLocalMinimumIsFound() {
Function<Double, Double> df = x ->
StrictMath.abs(StrictMath.pow(x, 3)) - (3 * StrictMath.pow(x, 2)) + x;
GradientDescent gd = new GradientDescent();
double res = gd.findLocalMinimum(df, 1);
assertTrue(res > 1.78);
assertTrue(res < 1.84);
}
}
algorithms-searching/README.md
+1
View File
@@ -10,3 +10,4 @@ This module contains articles about searching algorithms.
- [String Search Algorithms for Large Texts](https://www.baeldung.com/java-full-text-search-algorithms)
- [Monte Carlo Tree Search for Tic-Tac-Toe Game](https://www.baeldung.com/java-monte-carlo-tree-search)
- [Range Search Algorithm in Java](https://www.baeldung.com/java-range-search)
- [Fast Pattern Matching of Strings Using Suffix Tree](https://www.baeldung.com/java-pattern-matching-suffix-tree)
algorithms-searching/pom.xml
+4 -2
View File
@@ -1,6 +1,8 @@
<?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>algorithms-searching</artifactId>
<version>0.0.1-SNAPSHOT</version>
algorithms-searching/src/main/java/com/baeldung/algorithms/suffixtree/Node.java
+57
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@@ -0,0 +1,57 @@
package com.baeldung.algorithms.suffixtree;
import java.util.ArrayList;
import java.util.List;
public class Node {
private String text;
private List<Node> children;
private int position;
public Node(String word, int position) {
this.text = word;
this.position = position;
this.children = new ArrayList<>();
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public int getPosition() {
return position;
}
public void setPosition(int position) {
this.position = position;
}
public List<Node> getChildren() {
return children;
}
public void setChildren(List<Node> children) {
this.children = children;
}
public String printTree(String depthIndicator) {
String str = "";
String positionStr = position > -1 ? "[" + String.valueOf(position) + "]" : "";
str += depthIndicator + text + positionStr + "\n";
for (int i = 0; i < children.size(); i++) {
str += children.get(i)
.printTree(depthIndicator + "\t");
}
return str;
}
@Override
public String toString() {
return printTree("");
}
}
algorithms-searching/src/main/java/com/baeldung/algorithms/suffixtree/SuffixTree.java
+175
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@@ -0,0 +1,175 @@
package com.baeldung.algorithms.suffixtree;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SuffixTree {
private static final Logger LOGGER = LoggerFactory.getLogger(SuffixTree.class);
private static final String WORD_TERMINATION = "$";
private static final int POSITION_UNDEFINED = -1;
private Node root;
private String fullText;
public SuffixTree(String text) {
root = new Node("", POSITION_UNDEFINED);
for (int i = 0; i < text.length(); i++) {
addSuffix(text.substring(i) + WORD_TERMINATION, i);
}
fullText = text;
}
public List<String> searchText(String pattern) {
LOGGER.info("Searching for pattern \"{}\"", pattern);
List<String> result = new ArrayList<>();
List<Node> nodes = getAllNodesInTraversePath(pattern, root, false);
if (nodes.size() > 0) {
Node lastNode = nodes.get(nodes.size() - 1);
if (lastNode != null) {
List<Integer> positions = getPositions(lastNode);
positions = positions.stream()
.sorted()
.collect(Collectors.toList());
positions.forEach(m -> result.add((markPatternInText(m, pattern))));
}
}
return result;
}
private void addSuffix(String suffix, int position) {
LOGGER.info(">>>>>>>>>>>> Adding new suffix {}", suffix);
List<Node> nodes = getAllNodesInTraversePath(suffix, root, true);
if (nodes.size() == 0) {
addChildNode(root, suffix, position);
LOGGER.info("{}", printTree());
} else {
Node lastNode = nodes.remove(nodes.size() - 1);
String newText = suffix;
if (nodes.size() > 0) {
String existingSuffixUptoLastNode = nodes.stream()
.map(a -> a.getText())
.reduce("", String::concat);
// Remove prefix from newText already included in parent
newText = newText.substring(existingSuffixUptoLastNode.length());
}
extendNode(lastNode, newText, position);
LOGGER.info("{}", printTree());
}
}
private List<Integer> getPositions(Node node) {
List<Integer> positions = new ArrayList<>();
if (node.getText()
.endsWith(WORD_TERMINATION)) {
positions.add(node.getPosition());
}
for (int i = 0; i < node.getChildren()
.size(); i++) {
positions.addAll(getPositions(node.getChildren()
.get(i)));
}
return positions;
}
private String markPatternInText(Integer startPosition, String pattern) {
String matchingTextLHS = fullText.substring(0, startPosition);
String matchingText = fullText.substring(startPosition, startPosition + pattern.length());
String matchingTextRHS = fullText.substring(startPosition + pattern.length());
return matchingTextLHS + "[" + matchingText + "]" + matchingTextRHS;
}
private void addChildNode(Node parentNode, String text, int position) {
parentNode.getChildren()
.add(new Node(text, position));
}
private void extendNode(Node node, String newText, int position) {
String currentText = node.getText();
String commonPrefix = getLongestCommonPrefix(currentText, newText);
if (commonPrefix != currentText) {
String parentText = currentText.substring(0, commonPrefix.length());
String childText = currentText.substring(commonPrefix.length());
splitNodeToParentAndChild(node, parentText, childText);
}
String remainingText = newText.substring(commonPrefix.length());
addChildNode(node, remainingText, position);
}
private void splitNodeToParentAndChild(Node parentNode, String parentNewText, String childNewText) {
Node childNode = new Node(childNewText, parentNode.getPosition());
if (parentNode.getChildren()
.size() > 0) {
while (parentNode.getChildren()
.size() > 0) {
childNode.getChildren()
.add(parentNode.getChildren()
.remove(0));
}
}
parentNode.getChildren()
.add(childNode);
parentNode.setText(parentNewText);
parentNode.setPosition(POSITION_UNDEFINED);
}
private String getLongestCommonPrefix(String str1, String str2) {
int compareLength = Math.min(str1.length(), str2.length());
for (int i = 0; i < compareLength; i++) {
if (str1.charAt(i) != str2.charAt(i)) {
return str1.substring(0, i);
}
}
return str1.substring(0, compareLength);
}
private List<Node> getAllNodesInTraversePath(String pattern, Node startNode, boolean isAllowPartialMatch) {
List<Node> nodes = new ArrayList<>();
for (int i = 0; i < startNode.getChildren()
.size(); i++) {
Node currentNode = startNode.getChildren()
.get(i);
String nodeText = currentNode.getText();
if (pattern.charAt(0) == nodeText.charAt(0)) {
if (isAllowPartialMatch && pattern.length() <= nodeText.length()) {
nodes.add(currentNode);
return nodes;
}
int compareLength = Math.min(nodeText.length(), pattern.length());
for (int j = 1; j < compareLength; j++) {
if (pattern.charAt(j) != nodeText.charAt(j)) {
if (isAllowPartialMatch) {
nodes.add(currentNode);
}
return nodes;
}
}
nodes.add(currentNode);
if (pattern.length() > compareLength) {
List<Node> nodes2 = getAllNodesInTraversePath(pattern.substring(compareLength), currentNode, isAllowPartialMatch);
if (nodes2.size() > 0) {
nodes.addAll(nodes2);
} else if (!isAllowPartialMatch) {
nodes.add(null);
}
}
return nodes;
}
}
return nodes;
}
public String printTree() {
return root.printTree("");
}
}

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