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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.
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/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2005 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package mockit.external.asm;

/**
 * An empty {@link MethodVisitor} that delegates to another
 * {@link MethodVisitor}. This class can be used as a super class to quickly
 * implement usefull method adapter classes, just by overriding the necessary
 * methods.
 * 
 * @author Eric Bruneton
 */
public class MethodAdapter implements MethodVisitor
{
    /**
     * The {@link MethodVisitor} to which this adapter delegates calls.
     */
    protected MethodVisitor mv;

    /**
     * Constructs a new MethodAdapter object.
     * 
     * @param mv the code visitor to which this adapter must delegate calls.
     */
    public MethodAdapter(MethodVisitor mv) {
        this.mv = mv;
    }

    public AnnotationVisitor visitAnnotationDefault() {
        return mv.visitAnnotationDefault();
    }

    public AnnotationVisitor visitAnnotation(String desc, boolean visible)
    {
        return mv.visitAnnotation(desc, visible);
    }

    public AnnotationVisitor visitParameterAnnotation(int parameter, String desc, boolean visible)
    {
        return mv.visitParameterAnnotation(parameter, desc, visible);
    }

    public void visitAttribute(Attribute attr) {
        mv.visitAttribute(attr);
    }

    public void visitCode() {
        mv.visitCode();
    }

    public void visitInsn(int opcode) {
        mv.visitInsn(opcode);
    }

    public void visitIntInsn(int opcode, int operand) {
        mv.visitIntInsn(opcode, operand);
    }

    public void visitVarInsn(int opcode, int var) {
        mv.visitVarInsn(opcode, var);
    }

    public void visitTypeInsn(int opcode, String desc) {
        mv.visitTypeInsn(opcode, desc);
    }

    public void visitFieldInsn(int opcode, String owner, String name, String desc)
    {
        mv.visitFieldInsn(opcode, owner, name, desc);
    }

    public void visitMethodInsn(int opcode, String owner, String name, String desc)
    {
        mv.visitMethodInsn(opcode, owner, name, desc);
    }

    public void visitJumpInsn(int opcode, Label label) {
        mv.visitJumpInsn(opcode, label);
    }

    public void visitLabel(Label label) {
        mv.visitLabel(label);
    }

    public void visitLdcInsn(Object cst) {
        mv.visitLdcInsn(cst);
    }

    public void visitIincInsn(int var, int increment) {
        mv.visitIincInsn(var, increment);
    }

    public void visitTableSwitchInsn(int min, int max, Label dflt, Label[] labels)
    {
        mv.visitTableSwitchInsn(min, max, dflt, labels);
    }

    public void visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels)
    {
        mv.visitLookupSwitchInsn(dflt, keys, labels);
    }

    public void visitMultiANewArrayInsn(String desc, int dims) {
        mv.visitMultiANewArrayInsn(desc, dims);
    }

    public void visitTryCatchBlock(Label start, Label end, Label handler, String type)
    {
        mv.visitTryCatchBlock(start, end, handler, type);
    }

    public void visitLocalVariable(
        String name, String desc, String signature, Label start, Label end, int index)
    {
        mv.visitLocalVariable(name, desc, signature, start, end, index);
    }

    public void visitLineNumber(int line, Label start) {
        mv.visitLineNumber(line, start);
    }

    public void visitMaxs(int maxStack, int maxLocals) {
        mv.visitMaxs(maxStack, maxLocals);
    }

    public void visitEnd() {
        mv.visitEnd();
    }
}