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org.apache.jetspeed.util.BaseObjectProxy |
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1 | /* |
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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3 | * contributor license agreements. See the NOTICE file distributed with |
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4 | * this work for additional information regarding copyright ownership. |
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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6 | * (the "License"); you may not use this file except in compliance with |
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7 | * the License. You may obtain a copy of the License at |
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8 | * |
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9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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10 | * |
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11 | * Unless required by applicable law or agreed to in writing, software |
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12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | * See the License for the specific language governing permissions and |
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15 | * limitations under the License. |
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16 | */ |
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17 | package org.apache.jetspeed.util; |
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18 | ||
19 | import java.lang.reflect.InvocationHandler; |
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20 | import java.lang.reflect.Method; |
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21 | ||
22 | /** |
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23 | * BaseObjectProxy |
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24 | * |
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25 | * @author <a href="mailto:woonsan@apache.org">Woonsan Ko</a> |
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26 | * @version $Id: BaseObjectProxy.java 516448 2007-03-09 16:25:47Z ate $ |
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27 | */ |
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28 | 0 | public class BaseObjectProxy implements InvocationHandler |
29 | { |
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30 | ||
31 | protected static Method hashCodeMethod; |
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32 | protected static Method equalsMethod; |
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33 | protected static Method toStringMethod; |
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34 | ||
35 | static |
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36 | { |
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37 | try |
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38 | { |
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39 | 0 | hashCodeMethod = Object.class.getMethod("hashCode", null); |
40 | 0 | equalsMethod = Object.class.getMethod("equals", new Class [] { Object.class }); |
41 | 0 | toStringMethod = Object.class.getMethod("toString", null); |
42 | } |
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43 | 0 | catch (NoSuchMethodException e) |
44 | { |
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45 | 0 | throw new NoSuchMethodError(e.getMessage()); |
46 | 0 | } |
47 | 0 | } |
48 | ||
49 | public Object invoke(Object proxy, Method method, Object[] args) throws Throwable |
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50 | { |
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51 | 0 | Object result = null; |
52 | 0 | Class declaringClass = method.getDeclaringClass(); |
53 | ||
54 | 0 | if (declaringClass == Object.class) |
55 | { |
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56 | 0 | if (hashCodeMethod.equals(method)) |
57 | { |
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58 | 0 | result = proxyHashCode(proxy); |
59 | } |
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60 | 0 | else if (equalsMethod.equals(method)) |
61 | { |
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62 | 0 | result = proxyEquals(proxy, args[0]); |
63 | } |
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64 | 0 | else if (toStringMethod.equals(method)) |
65 | { |
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66 | 0 | result = proxyToString(proxy); |
67 | } |
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68 | else |
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69 | { |
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70 | 0 | throw new InternalError("unexpected Object method dispatched: " + method); |
71 | } |
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72 | } |
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73 | else |
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74 | { |
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75 | 0 | throw new InternalError("unexpected Object method dispatched: " + method); |
76 | } |
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77 | ||
78 | 0 | return result; |
79 | } |
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80 | ||
81 | protected Integer proxyHashCode(Object proxy) |
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82 | { |
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83 | 0 | return new Integer(System.identityHashCode(proxy)); |
84 | } |
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85 | ||
86 | protected Boolean proxyEquals(Object proxy, Object other) |
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87 | { |
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88 | 0 | return (proxy == other ? Boolean.TRUE : Boolean.FALSE); |
89 | } |
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90 | ||
91 | protected String proxyToString(Object proxy) |
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92 | { |
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93 | 0 | return proxy.getClass().getName() + '@' + Integer.toHexString(proxy.hashCode()); |
94 | } |
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95 | ||
96 | } |
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