org.sonar.plugins.monitor.agent.transform.MethodAppender.java Source code

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Here is the source code for org.sonar.plugins.monitor.agent.transform.MethodAppender.java

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/*
 * Sonar Internals Monitor Plugin
 * Copyright (C) 2012 SonarSource
 * dev@sonar.codehaus.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.plugins.monitor.agent.transform;

import org.objectweb.asm.MethodAdapter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

/**
 * {@link MethodTransformSpec} that adds some code right before the return statement.
 */
public abstract class MethodAppender extends MethodTransformSpec {

    public MethodAppender(String name, String desc) {
        super(name, desc);
    }

    @Override
    public MethodVisitor newAdapter(MethodVisitor base, int access, String name, String desc, String signature,
            String[] exceptions) {
        final CodeGenerator cg = new CodeGenerator(base);
        return new MethodAdapter(base) {
            @Override
            public void visitInsn(int opcode) {
                if (opcode == Opcodes.RETURN) {
                    append(cg);
                }
                super.visitInsn(opcode);
            }
        };
    }

    /**
     * Generates code to be appended right before the return statement.
     */
    protected abstract void append(CodeGenerator g);

}