separating the sun specific functionality into a new module

This commit is contained in:
Eugen Paraschiv
2017-11-28 12:36:54 +02:00
parent 7f2ace0da9
commit 5f57a6cb4b
17 changed files with 691 additions and 12 deletions
+26
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*.class
0.*
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
.resourceCache
# Packaged files #
*.jar
*.war
*.ear
# Files generated by integration tests
*.txt
backup-pom.xml
/bin/
/temp
#IntelliJ specific
.idea/
*.iml
+123
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=========
## Core Java Cookbooks and Examples
### Relevant Articles:
- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
- [Java - Reading a Large File Efficiently](http://www.baeldung.com/java-read-lines-large-file)
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- [Pattern Search with Grep in Java](http://www.baeldung.com/grep-in-java)
- [URL Encoding and Decoding in Java](http://www.baeldung.com/java-url-encoding-decoding)
- [Calculate the Size of a File in Java](http://www.baeldung.com/java-file-size)
- [The Basics of Java Generics](http://www.baeldung.com/java-generics)
- [The Traveling Salesman Problem in Java](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)
- [How to Create an Executable JAR with Maven](http://www.baeldung.com/executable-jar-with-maven)
- [How to Design a Genetic Algorithm in Java](http://www.baeldung.com/java-genetic-algorithm)
- [Guide to WeakHashMap in Java](http://www.baeldung.com/java-weakhashmap)
- [Spring Security – Cache Control Headers](http://www.baeldung.com/spring-security-cache-control-headers)
- [Basic Introduction to JMX](http://www.baeldung.com/java-management-extensions)
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- [Introduction to Nashorn](http://www.baeldung.com/java-nashorn)
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- [Chained Exceptions in Java](http://www.baeldung.com/java-chained-exceptions)
- [The Java HashMap Under the Hood](http://www.baeldung.com/java-hashmap)
- [A Guide to LinkedHashMap in Java](http://www.baeldung.com/java-linked-hashmap)
- [A Guide to TreeMap in Java](http://www.baeldung.com/java-treemap)
- [A Quick JUnit vs TestNG Comparison](http://www.baeldung.com/junit-vs-testng)
- [Java Primitive Conversions](http://www.baeldung.com/java-primitive-conversions)
- [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
- [Removing all nulls from a List in Java](http://www.baeldung.com/java-remove-nulls-from-list)
- [Removing all duplicates from a List in Java](http://www.baeldung.com/java-remove-duplicates-from-list)
- [Using Math.pow in Java](http://www.baeldung.com/java-math-pow)
- [Converting Strings to Enums in Java](http://www.baeldung.com/java-string-to-enum)
- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
- [Quick Guide to the Java StringTokenizer](http://www.baeldung.com/java-stringtokenizer)
- [JVM Log Forging](http://www.baeldung.com/jvm-log-forging)
- [Guide to sun.misc.Unsafe](http://www.baeldung.com/java-unsafe)
- [HashSet and TreeSet Comparison](http://www.baeldung.com/java-hashset-vs-treeset)
- [How to Perform a Simple HTTP Request in Java](http://www.baeldung.com/java-http-request)
- [Call Methods at Runtime Using Java Reflection](http://www.baeldung.com/java-method-reflection)
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- [How to Add a Single Element to a Stream](http://www.baeldung.com/java-stream-append-prepend)
- [Iterating Over Enum Values in Java](http://www.baeldung.com/java-enum-iteration)
- [Kotlin Java Interoperability](http://www.baeldung.com/kotlin-java-interoperability)
- [Using Java MappedByteBuffer](http://www.baeldung.com/java-mapped-byte-buffer)
- [How to Round a Number to N Decimal Places in Java](http://www.baeldung.com/java-round-decimal-number)
- [Changing Annotation Parameters At Runtime](http://www.baeldung.com/java-reflection-change-annotation-params)
- [How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null)
- [Converting String to Stream of chars](http://www.baeldung.com/java-string-to-stream)
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- [How to Get a Name of a Method Being Executed?](http://www.baeldung.com/java-name-of-executing-method)
- [Iterate over a Map in Java](http://www.baeldung.com/java-iterate-map)
- [Dynamic Proxies in Java](http://www.baeldung.com/java-dynamic-proxies)
- [How to Copy an Array in Java](http://www.baeldung.com/java-array-copy)
- [Introduction to JDBC](http://www.baeldung.com/java-jdbc)
- [Period and Duration in Java](http://www.baeldung.com/java-period-duration)
- [Converting a Stack Trace to a String in Java](http://www.baeldung.com/java-stacktrace-to-string)
- [Count Occurrences of a Char in a String](http://www.baeldung.com/java-count-chars)
- [Java Double Brace Initialization](http://www.baeldung.com/java-double-brace-initialization)
- [The StackOverflowError in Java](http://www.baeldung.com/java-stack-overflow-error)
- [Split a String in Java](http://www.baeldung.com/java-split-string)
- [Introduction to Java Serialization](http://www.baeldung.com/java-serialization)
- [How to Remove the Last Character of a String?](http://www.baeldung.com/java-remove-last-character-of-string)
- [ClassNotFoundException vs NoClassDefFoundError](http://www.baeldung.com/java-classnotfoundexception-and-noclassdeffounderror)
- [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)
- [Guide to hashCode() in Java](http://www.baeldung.com/java-hashcode)
- [Collect a Java Stream to an Immutable Collection](http://www.baeldung.com/java-stream-immutable-collection)
- [Difference between URL and URI](http://www.baeldung.com/java-url-vs-uri)
- [Broadcasting and Multicasting in Java](http://www.baeldung.com/java-broadcast-multicast)
- [Converting a List to String in Java](http://www.baeldung.com/java-list-to-string)
- [CharSequence vs. String in Java](http://www.baeldung.com/java-char-sequence-string)
- [Period and Duration in Java](http://www.baeldung.com/java-period-duration)
- [Guide to the Diamond Operator in Java](http://www.baeldung.com/java-diamond-operator)
- [Singletons in Java](http://www.baeldung.com/java-singleton)
- [“Sneaky Throws” in Java](http://www.baeldung.com/java-sneaky-throws)
- [OutOfMemoryError: GC Overhead Limit Exceeded](http://www.baeldung.com/java-gc-overhead-limit-exceeded)
- [How to Iterate Over a Stream With Indices](http://www.baeldung.com/java-stream-indices)
- [StringBuilder and StringBuffer in Java](http://www.baeldung.com/java-string-builder-string-buffer)
- [Number of Digits in an Integer in Java](http://www.baeldung.com/java-number-of-digits-in-int)
- [Proxy, Decorator, Adapter and Bridge Patterns](http://www.baeldung.com/java-structural-design-patterns)
- [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)
- [A Guide to the Static Keyword in Java](http://www.baeldung.com/java-static)
- [Initializing Arrays in Java](http://www.baeldung.com/java-initialize-array)
- [Guide to Java String Pool](http://www.baeldung.com/java-string-pool)
- [Copy a File with Java](http://www.baeldung.com/java-copy-file)
- [Introduction to Creational Design Patterns](http://www.baeldung.com/creational-design-patterns)
File diff suppressed because it is too large Load Diff
@@ -0,0 +1,13 @@
*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear
@@ -0,0 +1,2 @@
### Relevant Articles:
- [SHA-256 Hashing in Java](http://www.baeldung.com/sha-256-hashing-java)
@@ -0,0 +1,9 @@
package com.baeldung.javac;
import java.lang.annotation.*;
@Documented
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.PARAMETER})
public @interface Positive {
}
@@ -0,0 +1,123 @@
package com.baeldung.javac;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.VariableTree;
import com.sun.source.util.*;
import com.sun.tools.javac.api.BasicJavacTask;
import com.sun.tools.javac.code.TypeTag;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Name;
import com.sun.tools.javac.util.Names;
import javax.tools.JavaCompiler;
import java.util.*;
import java.util.stream.Collectors;
import static com.sun.tools.javac.util.List.nil;
/**
* A {@link JavaCompiler javac} plugin which inserts {@code >= 0} checks into resulting {@code *.class} files
* for numeric method parameters marked by {@link Positive}
*/
public class SampleJavacPlugin implements Plugin {
public static final String NAME = "MyPlugin";
private static Set<String> TARGET_TYPES = new HashSet<>(Arrays.asList(
// Use only primitive types for simplicity
byte.class.getName(), short.class.getName(), char.class.getName(),
int.class.getName(), long.class.getName(), float.class.getName(), double.class.getName()));
@Override
public String getName() {
return NAME;
}
@Override
public void init(JavacTask task, String... args) {
Context context = ((BasicJavacTask) task).getContext();
task.addTaskListener(new TaskListener() {
@Override
public void started(TaskEvent e) {
}
@Override
public void finished(TaskEvent e) {
if (e.getKind() != TaskEvent.Kind.PARSE) {
return;
}
e.getCompilationUnit()
.accept(new TreeScanner<Void, Void>() {
@Override
public Void visitMethod(MethodTree method, Void v) {
List<VariableTree> parametersToInstrument = method.getParameters()
.stream()
.filter(SampleJavacPlugin.this::shouldInstrument)
.collect(Collectors.toList());
if (!parametersToInstrument.isEmpty()) {
// There is a possible case that more than one argument is marked by @Positive,
// as the checks are added to the method's body beginning, we process parameters RTL
// to ensure correct order.
Collections.reverse(parametersToInstrument);
parametersToInstrument.forEach(p -> addCheck(method, p, context));
}
// There is a possible case that there is a nested class declared in a method's body,
// hence, we want to proceed with method body AST as well.
return super.visitMethod(method, v);
}
}, null);
}
});
}
private boolean shouldInstrument(VariableTree parameter) {
return TARGET_TYPES.contains(parameter.getType().toString())
&& parameter.getModifiers().getAnnotations()
.stream()
.anyMatch(a -> Positive.class.getSimpleName().equals(a.getAnnotationType().toString()));
}
private void addCheck(MethodTree method, VariableTree parameter, Context context) {
JCTree.JCIf check = createCheck(parameter, context);
JCTree.JCBlock body = (JCTree.JCBlock) method.getBody();
body.stats = body.stats.prepend(check);
}
private static JCTree.JCIf createCheck(VariableTree parameter, Context context) {
TreeMaker factory = TreeMaker.instance(context);
Names symbolsTable = Names.instance(context);
return factory.at(((JCTree) parameter).pos)
.If(factory.Parens(createIfCondition(factory, symbolsTable, parameter)),
createIfBlock(factory, symbolsTable, parameter),
null);
}
private static JCTree.JCBinary createIfCondition(TreeMaker factory, Names symbolsTable, VariableTree parameter) {
Name parameterId = symbolsTable.fromString(parameter.getName().toString());
return factory.Binary(JCTree.Tag.LE,
factory.Ident(parameterId),
factory.Literal(TypeTag.INT, 0));
}
private static JCTree.JCBlock createIfBlock(TreeMaker factory, Names symbolsTable, VariableTree parameter) {
String parameterName = parameter.getName().toString();
Name parameterId = symbolsTable.fromString(parameterName);
String errorMessagePrefix = String.format("Argument '%s' of type %s is marked by @%s but got '",
parameterName, parameter.getType(), Positive.class.getSimpleName());
String errorMessageSuffix = "' for it";
return factory.Block(0, com.sun.tools.javac.util.List.of(
factory.Throw(
factory.NewClass(null, nil(),
factory.Ident(symbolsTable.fromString(IllegalArgumentException.class.getSimpleName())),
com.sun.tools.javac.util.List.of(factory.Binary(JCTree.Tag.PLUS,
factory.Binary(JCTree.Tag.PLUS, factory.Literal(TypeTag.CLASS, errorMessagePrefix),
factory.Ident(parameterId)),
factory.Literal(TypeTag.CLASS, errorMessageSuffix))), null))));
}
}
@@ -0,0 +1,6 @@
log4j.rootLogger=DEBUG, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
@@ -0,0 +1,19 @@
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>web - %date [%thread] %-5level %logger{36} - %message%n
</pattern>
</encoder>
</appender>
<logger name="org.springframework" level="WARN" />
<logger name="org.springframework.transaction" level="WARN" />
<!-- in order to debug some marshalling issues, this needs to be TRACE -->
<logger name="org.springframework.web.servlet.mvc" level="WARN" />
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>
@@ -0,0 +1,42 @@
package com.baeldung.javac;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class SampleJavacPluginIntegrationTest {
private static final String CLASS_TEMPLATE =
"package com.baeldung.javac;\n" +
"\n" +
"public class Test {\n" +
" public static %1$s service(@Positive %1$s i) {\n" +
" return i;\n" +
" }\n" +
"}\n" +
"";
private TestCompiler compiler = new TestCompiler();
private TestRunner runner = new TestRunner();
@Test(expected = IllegalArgumentException.class)
public void givenInt_whenNegative_thenThrowsException() throws Throwable {
compileAndRun(double.class,-1);
}
@Test(expected = IllegalArgumentException.class)
public void givenInt_whenZero_thenThrowsException() throws Throwable {
compileAndRun(int.class,0);
}
@Test
public void givenInt_whenPositive_thenSuccess() throws Throwable {
assertEquals(1, compileAndRun(int.class, 1));
}
private Object compileAndRun(Class<?> argumentType, Object argument) throws Throwable {
String qualifiedClassName = "com.baeldung.javac.Test";
byte[] byteCode = compiler.compile(qualifiedClassName, String.format(CLASS_TEMPLATE, argumentType.getName()));
return runner.run(byteCode, qualifiedClassName, "service", new Class[] {argumentType}, argument);
}
}
@@ -0,0 +1,26 @@
package com.baeldung.javac;
import javax.tools.SimpleJavaFileObject;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;
/** Holds compiled byte code in a byte array */
public class SimpleClassFile extends SimpleJavaFileObject {
private ByteArrayOutputStream out;
public SimpleClassFile(URI uri) {
super(uri, Kind.CLASS);
}
@Override
public OutputStream openOutputStream() throws IOException {
return out = new ByteArrayOutputStream();
}
public byte[] getCompiledBinaries() {
return out.toByteArray();
}
}
@@ -0,0 +1,34 @@
package com.baeldung.javac;
import javax.tools.*;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
/** Adapts {@link SimpleClassFile} to the {@link JavaCompiler} */
public class SimpleFileManager extends ForwardingJavaFileManager<StandardJavaFileManager> {
private final List<SimpleClassFile> compiled = new ArrayList<>();
public SimpleFileManager(StandardJavaFileManager delegate) {
super(delegate);
}
@Override
public JavaFileObject getJavaFileForOutput(Location location,
String className,
JavaFileObject.Kind kind,
FileObject sibling)
{
SimpleClassFile result = new SimpleClassFile(URI.create("string://" + className));
compiled.add(result);
return result;
}
/**
* @return compiled binaries processed by the current class
*/
public List<SimpleClassFile> getCompiled() {
return compiled;
}
}
@@ -0,0 +1,23 @@
package com.baeldung.javac;
import javax.tools.SimpleJavaFileObject;
import java.net.URI;
/** Exposes given test source to the compiler. */
public class SimpleSourceFile extends SimpleJavaFileObject {
private final String content;
public SimpleSourceFile(String qualifiedClassName, String testSource) {
super(URI.create(String.format("file://%s%s",
qualifiedClassName.replaceAll("\\.", "/"),
Kind.SOURCE.extension)),
Kind.SOURCE);
content = testSource;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return content;
}
}
@@ -0,0 +1,35 @@
package com.baeldung.javac;
import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import static java.util.Arrays.asList;
import static java.util.Collections.singletonList;
public class TestCompiler {
public byte[] compile(String qualifiedClassName, String testSource) {
StringWriter output = new StringWriter();
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
SimpleFileManager fileManager = new SimpleFileManager(compiler.getStandardFileManager(
null,
null,
null
));
List<SimpleSourceFile> compilationUnits = singletonList(new SimpleSourceFile(qualifiedClassName, testSource));
List<String> arguments = new ArrayList<>();
arguments.addAll(asList("-classpath", System.getProperty("java.class.path"),
"-Xplugin:" + SampleJavacPlugin.NAME));
JavaCompiler.CompilationTask task = compiler.getTask(output,
fileManager,
null,
arguments,
null,
compilationUnits);
task.call();
return fileManager.getCompiled().iterator().next().getCompiledBinaries();
}
}
@@ -0,0 +1,41 @@
package com.baeldung.javac;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class TestRunner {
public Object run(byte[] byteCode,
String qualifiedClassName,
String methodName,
Class<?>[] argumentTypes,
Object... args)
throws Throwable
{
ClassLoader classLoader = new ClassLoader() {
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
return defineClass(name, byteCode, 0, byteCode.length);
}
};
Class<?> clazz;
try {
clazz = classLoader.loadClass(qualifiedClassName);
} catch (ClassNotFoundException e) {
throw new RuntimeException("Can't load compiled test class", e);
}
Method method;
try {
method = clazz.getMethod(methodName, argumentTypes);
} catch (NoSuchMethodException e) {
throw new RuntimeException("Can't find the 'main()' method in the compiled test class", e);
}
try {
return method.invoke(null, args);
} catch (InvocationTargetException e) {
throw e.getCause();
}
}
}
@@ -0,0 +1,13 @@
*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear