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/*
 * Copyright 2003-2014 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.classgen.asm;

import org.codehaus.groovy.control.BytecodeProcessor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.util.TraceClassVisitor;

import java.io.PrintWriter;
import java.io.Writer;

/**
 * An utility class which can be used in test cases to dump generated bytecode.
 *
 * @author Cédric Champeau
 * @since 2.4.0
 */
public class BytecodeDumper implements BytecodeProcessor {
    public static final BytecodeDumper STANDARD_ERR = new BytecodeDumper(new PrintWriter(System.err));

    private final Writer out;

    public BytecodeDumper(final Writer out) {
        this.out = out;
    }

    @Override
    public byte[] processBytecode(final String name, final byte[] original) {
        PrintWriter pw = out instanceof PrintWriter ? (PrintWriter) out : new PrintWriter(out);
        TraceClassVisitor visitor = new TraceClassVisitor(pw);
        ClassReader reader = new ClassReader(original);
        reader.accept(visitor, 0);
        return original;
    }

}