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

/**
 * A node that represents a type annotation on a local or resource variable.
 * 
 * @author Eric Bruneton
 */
public class LocalVariableAnnotationNode extends TypeAnnotationNode {

    /**
     * The fist instructions corresponding to the continuous ranges that make
     * the scope of this local variable (inclusive). Must not be null.
     */
    public List start;

    /**
     * The last instructions corresponding to the continuous ranges that make
     * the scope of this local variable (exclusive). This list must have the
     * same size as the 'start' list. Must not be null.
     */
    public List end;

    /**
     * The local variable's index in each range. This list must have the same
     * size as the 'start' list. Must not be null.
     */
    public List index;

    /**
     * Constructs a new {@link LocalVariableAnnotationNode}. Subclasses must
     * not use this constructor. Instead, they must use the
     * {@link #LocalVariableAnnotationNode(int, TypePath, LabelNode[], LabelNode[], int[], String)}
     * version.
     * 
     * @param typeRef
     *            a reference to the annotated type. See {@link TypeReference}.
     * @param typePath
     *            the path to the annotated type argument, wildcard bound, array
     *            element type, or static inner type within 'typeRef'. May be
     *            null if the annotation targets 'typeRef' as a whole.
     * @param start
     *            the fist instructions corresponding to the continuous ranges
     *            that make the scope of this local variable (inclusive).
     * @param end
     *            the last instructions corresponding to the continuous ranges
     *            that make the scope of this local variable (exclusive). This
     *            array must have the same size as the 'start' array.
     * @param index
     *            the local variable's index in each range. This array must have
     *            the same size as the 'start' array.
     * @param desc
     *            the class descriptor of the annotation class.
     */
    public LocalVariableAnnotationNode(int typeRef, TypePath typePath,
            LabelNode[] start, LabelNode[] end, int[] index, String desc) {
        this(Opcodes.ASM5, typeRef, typePath, start, end, index, desc);
    }

    /**
     * Constructs a new {@link LocalVariableAnnotationNode}.
     * 
     * @param api
     *            the ASM API version implemented by this visitor. Must be one
     *            of {@link Opcodes#ASM4} or {@link Opcodes#ASM5}.
     * @param typeRef
     *            a reference to the annotated type. See {@link TypeReference}.
     * @param start
     *            the fist instructions corresponding to the continuous ranges
     *            that make the scope of this local variable (inclusive).
     * @param end
     *            the last instructions corresponding to the continuous ranges
     *            that make the scope of this local variable (exclusive). This
     *            array must have the same size as the 'start' array.
     * @param index
     *            the local variable's index in each range. This array must have
     *            the same size as the 'start' array.
     * @param typePath
     *            the path to the annotated type argument, wildcard bound, array
     *            element type, or static inner type within 'typeRef'. May be
     *            null if the annotation targets 'typeRef' as a whole.
     * @param desc
     *            the class descriptor of the annotation class.
     */
    public LocalVariableAnnotationNode(int api, int typeRef, TypePath typePath,
            LabelNode[] start, LabelNode[] end, int[] index, String desc) {
        super(api, typeRef, typePath, desc);
        this.start = new ArrayList(start.length);
        this.start.addAll(Arrays.asList(start));
        this.end = new ArrayList(end.length);
        this.end.addAll(Arrays.asList(end));
        this.index = new ArrayList(index.length);
        for (int i : index) {
            this.index.add(i);
        }
    }

    /**
     * Makes the given visitor visit this type annotation.
     * 
     * @param mv
     *            the visitor that must visit this annotation.
     * @param visible
     *            true if the annotation is visible at runtime.
     */
    public void accept(final MethodVisitor mv, boolean visible) {
        Label[] start = new Label[this.start.size()];
        Label[] end = new Label[this.end.size()];
        int[] index = new int[this.index.size()];
        for (int i = 0; i < start.length; ++i) {
            start[i] = this.start.get(i).getLabel();
            end[i] = this.end.get(i).getLabel();
            index[i] = this.index.get(i);
        }
        accept(mv.visitLocalVariableAnnotation(typeRef, typePath, start, end,
                index, desc, true));
    }
}