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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly
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/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 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 org.easymock.asm.tree;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

import org.easymock.asm.Label;
import org.easymock.asm.MethodVisitor;
import org.easymock.asm.Opcodes;

/**
 * A node that represents a TABLESWITCH instruction.
 * 
 * @author Eric Bruneton
 */
public class TableSwitchInsnNode extends AbstractInsnNode {

    /**
     * The minimum key value.
     */
    public int min;

    /**
     * The maximum key value.
     */
    public int max;

    /**
     * Beginning of the default handler block.
     */
    public LabelNode dflt;

    /**
     * Beginnings of the handler blocks. This list is a list of
     * {@link LabelNode} objects.
     */
    public List labels;

    /**
     * Constructs a new {@link TableSwitchInsnNode}.
     * 
     * @param min
     *            the minimum key value.
     * @param max
     *            the maximum key value.
     * @param dflt
     *            beginning of the default handler block.
     * @param labels
     *            beginnings of the handler blocks. labels[i] is the
     *            beginning of the handler block for the min + i key.
     */
    public TableSwitchInsnNode(final int min, final int max,
            final LabelNode dflt, final LabelNode... labels) {
        super(Opcodes.TABLESWITCH);
        this.min = min;
        this.max = max;
        this.dflt = dflt;
        this.labels = new ArrayList();
        if (labels != null) {
            this.labels.addAll(Arrays.asList(labels));
        }
    }

    @Override
    public int getType() {
        return TABLESWITCH_INSN;
    }

    @Override
    public void accept(final MethodVisitor mv) {
        Label[] labels = new Label[this.labels.size()];
        for (int i = 0; i < labels.length; ++i) {
            labels[i] = this.labels.get(i).getLabel();
        }
        mv.visitTableSwitchInsn(min, max, dflt.getLabel(), labels);
        acceptAnnotations(mv);
    }

    @Override
    public AbstractInsnNode clone(final Map labels) {
        return new TableSwitchInsnNode(min, max, clone(dflt, labels), clone(
                this.labels, labels)).cloneAnnotations(this);
    }
}