CallbackFilter


1   /*
2    * Copyright 2003,2004 The Apache Software Foundation
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package net.sf.cglib.proxy;
17  
18  import java.lang.reflect.Method  ;
19  
20  /**
21   * Map methods of subclasses generated by {@link Enhancer} to a particular
22   * callback. The type of the callbacks chosen for each method affects
23   * the bytecode generated for that method in the subclass, and cannot
24   * change for the life of the class.
25   */
26  public interface CallbackFilter {
27      /**
28       * Map a method to a callback.
29       * @param method the intercepted method
30       * @return the index into the array of callbacks (as specified by {@link Enhancer#setCallbacks}) to use for the method, 
31       */
32      int accept(Method   method);
33  
34      /**
35       * The <code>CallbackFilter</code> in use affects which cached class
36       * the <code>Enhancer</code> will use, so this is a reminder that
37       * you should correctly implement <code>equals</code> and
38       * <code>hashCode</code> for custom <code>CallbackFilter</code>
39       * implementations in order to improve performance.
40      */
41      boolean equals(Object   o);
42  }
43
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