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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly

There is a newer version: 5.2.0

/*
 * Copyright 2003,2004 The Apache Software Foundation
 *
 *  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.easymock.cglib.proxy;

import java.lang.reflect.Method;

/**
 * Map methods of subclasses generated by {@link Enhancer} to a particular
 * callback. The type of the callbacks chosen for each method affects
 * the bytecode generated for that method in the subclass, and cannot
 * change for the life of the class.
 */
public interface CallbackFilter {
    /**
     * Map a method to a callback.
     * @param method the intercepted method
     * @return the index into the array of callbacks (as specified by {@link Enhancer#setCallbacks}) to use for the method, 
     */
    int accept(Method method);

    /**
     * The CallbackFilter in use affects which cached class
     * the Enhancer will use, so this is a reminder that
     * you should correctly implement equals and
     * hashCode for custom CallbackFilter
     * implementations in order to improve performance.
    */
    boolean equals(Object o);
}