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/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.eclipse.agent;
import java.io.File;
import java.io.IOException;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URI;
import java.net.URLDecoder;
import java.nio.charset.Charset;
import java.security.ProtectionDomain;
import java.util.jar.JarFile;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* This is a java-agent that patches some of eclipse's classes so AST Nodes are handed off to Lombok
* for modification before Eclipse actually uses them to compile, render errors, show code outlines,
* create auto-completion dialogs, and anything else eclipse does with java code. See the *Transformer
* classes in this package for more information about which classes are transformed and how they are
* transformed.
*/
public class EclipsePatcher {
private EclipsePatcher() {}
private static class Patcher implements ClassFileTransformer {
public byte[] transform(ClassLoader loader, String className,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain, byte[] classfileBuffer)
throws IllegalClassFormatException {
if ( ECLIPSE_PARSER_CLASS_NAME.equals(className) ) {
try {
return runTransform("lombok.eclipse.agent.EclipseParserTransformer", classfileBuffer);
} catch ( Throwable t ) {
System.err.println("Wasn't able to patch eclipse's Parser class:");
t.printStackTrace();
}
}
if ( ECLIPSE_CUD_CLASS_NAME.equals(className) ) {
try {
return runTransform("lombok.eclipse.agent.EclipseCUDTransformer", classfileBuffer);
} catch ( Throwable t ) {
System.err.println("Wasn't able to patch eclipse's CompilationUnitDeclaration class:");
t.printStackTrace();
}
}
return null;
}
}
private static byte[] runTransform(String className, byte[] classfileBuffer) throws Exception {
Class<?> transformerClass = Class.forName(className);
Constructor<?> constructor = transformerClass.getDeclaredConstructor();
constructor.setAccessible(true);
Object instance = constructor.newInstance();
Method m = transformerClass.getDeclaredMethod("transform", byte[].class);
m.setAccessible(true);
return (byte[])m.invoke(instance, classfileBuffer);
}
static final String ECLIPSE_CUD_CLASS_NAME = "org/eclipse/jdt/internal/compiler/ast/CompilationUnitDeclaration";
static final String ECLIPSE_PARSER_CLASS_NAME = "org/eclipse/jdt/internal/compiler/parser/Parser";
public static void agentmain(String agentArgs, Instrumentation instrumentation) throws Exception {
registerPatcher(instrumentation, true);
addLombokToSearchPaths(instrumentation);
}
private static void addLombokToSearchPaths(Instrumentation instrumentation) throws Exception {
String path = findPathOfOurClassloader();
//On java 1.5, you don't have these methods, so you'll be forced to manually -Xbootclasspath/a them in.
tryCallMethod(instrumentation, "appendToSystemClassLoaderSearch", path + "/lombok.jar");
tryCallMethod(instrumentation, "appendToBootstrapClassLoaderSearch", path + "/lombok.eclipse.agent.jar");
}
private static void tryCallMethod(Object o, String methodName, String path) {
try {
Instrumentation.class.getMethod(methodName, JarFile.class).invoke(o, new JarFile(path));
} catch ( Throwable ignore ) {}
}
private static String findPathOfOurClassloader() throws Exception {
URI uri = EclipsePatcher.class.getResource("/" + EclipsePatcher.class.getName().replace('.', '/') + ".class").toURI();
Pattern p = Pattern.compile("^jar:file:([^\\!]+)\\!.*\\.class$");
Matcher m = p.matcher(uri.toString());
if ( !m.matches() ) return ".";
String rawUri = m.group(1);
return new File(URLDecoder.decode(rawUri, Charset.defaultCharset().name())).getParent();
}
public static void premain(String agentArgs, Instrumentation instrumentation) throws Exception {
registerPatcher(instrumentation, false);
addLombokToSearchPaths(instrumentation);
}
private static void registerPatcher(Instrumentation instrumentation, boolean transformExisting) throws IOException {
instrumentation.addTransformer(new Patcher()/*, true*/);
if ( transformExisting ) for ( Class<?> c : instrumentation.getAllLoadedClasses() ) {
if ( c.getName().equals(ECLIPSE_PARSER_CLASS_NAME) || c.getName().equals(ECLIPSE_CUD_CLASS_NAME) ) {
try {
//instrumentation.retransformClasses(c); - //not in java 1.5.
Instrumentation.class.getMethod("retransformClasses", Class[].class).invoke(instrumentation,
new Object[] { new Class[] {c }});
} catch ( InvocationTargetException e ) {
throw new UnsupportedOperationException(
"The eclipse parser class is already loaded and cannot be modified. " +
"You'll have to restart eclipse in order to use Lombok in eclipse.");
} catch ( Throwable t ) {
throw new UnsupportedOperationException(
"This appears to be a java 1.5 instance, which cannot reload already loaded classes. " +
"You'll have to restart eclipse in order to use Lombok in eclipse.");
}
}
}
}
}
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