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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 org.objectweb.asm.ClassAdapter;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Opcodes;
/**
* Transforms Eclipse's <code>org.eclipse.jdt.internal.compiler.ast CompilationUnitDeclaration</code> class,
* which is the top-level AST Node class for Eclipse.
*
* Transformations applied:<ul>
* <li>A field is added: 'public transient Object $lombokAST = null;'. We use it to cache our own AST object,
* usually of type <code>lombok.eclipse.EclipseAST.</code></li></ul>
*/
class EclipseCUDTransformer {
byte[] transform(byte[] classfileBuffer) {
ClassReader reader = new ClassReader(classfileBuffer);
ClassWriter writer = new ClassWriter(reader, 0);
ClassAdapter adapter = new CUDPatcherAdapter(writer);
reader.accept(adapter, 0);
return writer.toByteArray();
}
private static class CUDPatcherAdapter extends ClassAdapter {
CUDPatcherAdapter(ClassVisitor cv) {
super(cv);
}
@Override public void visitEnd() {
FieldVisitor fv = cv.visitField(Opcodes.ACC_PUBLIC | Opcodes.ACC_TRANSIENT, "$lombokAST", "Ljava/lang/Object;", null, null);
fv.visitEnd();
cv.visitEnd();
}
}
}
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