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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 java.lombok.eclipse;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
/**
* Allows you to inject the lombok classes into any classloader, even if that classloader does not
* know how to find the lombok classes.
*
* Example: Injecting lombok's Eclipse Parser patching code into eclipse's OSGi BundleLoader.
*
* @author rzwitserloot
*/
public class ClassLoaderWorkaround {
static RuntimeException sneakyThrow(Throwable t) {
if ( t == null ) throw new NullPointerException("t");
ClassLoaderWorkaround.<RuntimeException>sneakyThrow0(t);
return null;
}
@SuppressWarnings("unchecked")
private static <T extends Throwable> void sneakyThrow0(Throwable t) throws T {
throw (T)t;
}
private static final Map<ClassLoader, Method> transform = new HashMap<ClassLoader, Method>();
public static void transformCompilationUnitDeclaration(Object parser, Object cud) throws Exception {
Method transformMethod = getTransformMethod(cud);
try {
checkTypeCompatible(parser.getClass(), "org.eclipse.jdt.internal.compiler.parser.Parser");
checkTypeCompatible(cud.getClass(), "org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration");
try {
transformMethod.invoke(null, parser, cud);
} catch ( IllegalArgumentException ex ) {
checkTypeCompatible2(parser.getClass(), "org.eclipse.jdt.internal.compiler.parser.Parser");
checkTypeCompatible2(cud.getClass(), "org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration");
throw ex;
}
} catch ( InvocationTargetException e ) {
throw sneakyThrow(e.getCause());
}
}
private static void checkTypeCompatible(Class<? extends Object> c, String expected) {
StringBuilder sb = new StringBuilder();
while ( c != null ) {
if ( c.getName().equals(expected) ) return;
sb.append(" ").append(c.getName());
c = c.getSuperclass();
}
System.err.println("Not a match to " + expected);
System.err.println(sb.toString());
}
private static void checkTypeCompatible2(Class<? extends Object> c, String expected) {
StringBuilder sb = new StringBuilder();
while ( c != null ) {
sb.append(" ").append(c.getName());
c = c.getSuperclass();
}
System.err.println("Expecting " + expected);
System.err.println(sb.toString());
}
private static Method getTransformMethod(Object cud) throws ClassNotFoundException {
ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
synchronized ( transform ) {
if ( !transform.containsKey(contextLoader)) {
System.out.println("Creating classloader: " + Thread.currentThread());
transform.put(contextLoader, findTransformMethod(cud));
}
Method m = transform.get(contextLoader);
if ( m == null ) throw new ClassNotFoundException("lombok.eclipse.TransformEclipseAST");
return m;
}
}
private static Method findTransformMethod(Object cud) throws ClassNotFoundException {
final ClassLoader parent = cud.getClass().getClassLoader();
ClassLoader loader = new ClassLoader() {
@Override public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
if ( name.startsWith("lombok.") ) {
InputStream in = ClassLoader.getSystemClassLoader().getResourceAsStream(name.replace(".", "/") + ".class");
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] b = new byte[65536];
try {
while ( true ) {
int r = in.read(b);
if ( r == -1 ) break;
if ( r > 0 ) out.write(b, 0, r);
}
in.close();
byte[] data = out.toByteArray();
Class<?> result = defineClass(name, data, 0, data.length);
if ( resolve ) resolveClass(result);
return result;
} catch ( IOException e ) {
throw new ClassNotFoundException();
}
} else {
try {
Class<?> result = ClassLoader.getSystemClassLoader().loadClass(name);
if ( resolve ) resolveClass(result);
return result;
} catch ( ClassNotFoundException e ) {
Class<?> result = parent.loadClass(name);
if ( resolve ) resolveClass(result);
return result;
}
}
}
};
Class<?> c = loader.loadClass("lombok.eclipse.TransformEclipseAST");
for ( Method method : c.getMethods() ) {
if ( method.getName().equals("transform") ) {
Class<?>[] types = method.getParameterTypes();
if ( types.length != 2 ) continue;
if ( !types[0].getName().equals("org.eclipse.jdt.internal.compiler.parser.Parser") ) continue;
if ( !types[1].getName().equals("org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration") ) continue;
return method;
}
}
throw new ClassNotFoundException("lombok.eclipse.TransformEclipseAST");
}
}
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