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Groovy example source code file (

This example Groovy source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

asmclassgenerator, asmifierclassvisitor, asmifierclassvisitor, check_class, check_class, classcollector, classgenerator, compileunit, compileunit, debugcollector, debugcollector, dump_class, generatorcontext, io, printwriter

The Groovy source code

 * Copyright 2003-2011 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.codehaus.groovy.classgen;

import groovy.lang.GroovyClassLoader;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.CompileUnit;
import org.codehaus.groovy.control.CompilationUnit;
import org.codehaus.groovy.control.CompilerConfiguration;
import org.codehaus.groovy.control.SourceUnit;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.util.ASMifierClassVisitor;
import org.objectweb.asm.util.CheckClassAdapter;


 * A class loader used for debugging the bytecode generation.
 * This will log all bytecode being loaded
 * @author <a href="">James Strachan
 * @version $Revision: 21496 $
public class DumpingClassLoader extends GroovyClassLoader implements Opcodes {

    protected static boolean CHECK_CLASS = false;
    protected static boolean DUMP_CLASS = true;

    public DumpingClassLoader(ClassLoader parentLoader) {

    protected class DebugCollector extends ClassCollector {

        DebugCollector(GroovyClassLoader cl, CompilationUnit unit, SourceUnit su) {
            super(new GroovyClassLoader.InnerLoader(cl), unit, su);

        public void call(ClassVisitor classWriter, ClassNode classNode) {
            // lets test out the class verifier
            if (DUMP_CLASS) {

            if (CHECK_CLASS) {

  , classNode);

    protected ClassCollector createCollector(CompilationUnit unit) {
        return new DebugCollector(this, unit, null);

    protected ASMifierClassVisitor dumpVisitor = new ASMifierClassVisitor(new PrintWriter(new OutputStreamWriter(System.out)));
    protected ASMifierClassVisitor invisibleDumpVisitor = new ASMifierClassVisitor(new PrintWriter(new StringWriter()));
    protected CompileUnit unit = new CompileUnit(this, new CompilerConfiguration());
    protected ClassGenerator checker =
            new AsmClassGenerator(null,new GeneratorContext(unit), new CheckClassAdapter(invisibleDumpVisitor), null);
    protected ClassGenerator dumper = new AsmClassGenerator(null,new GeneratorContext(unit), dumpVisitor, null);


Other Groovy examples (source code examples)

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