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Java > Open Source Codes > net > sf > retrotranslator > runtime > impl > AnnotationHandler


1 /***
2  * Retrotranslator: a Java bytecode transformer that translates Java classes
3  * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
4  *
5  * Copyright (c) 2005 - 2007 Taras Puchko
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the copyright holders nor the names of its
17  * contributors may be used to endorse or promote products derived from
18  * this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */

32 package net.sf.retrotranslator.runtime.impl;
33
34 import java.io.Serializable JavaDoc;
35 import java.lang.annotation.IncompleteAnnotationException JavaDoc;
36 import java.lang.reflect.*;
37 import java.util.*;
38 import net.sf.retrotranslator.runtime.java.lang.annotation.Annotation_;
39
40 /**
41  * @author Taras Puchko
42  */

43 public class AnnotationHandler implements InvocationHandler, Serializable JavaDoc {
44
45     private Class JavaDoc annotationType;
46     private String JavaDoc asString;
47     private Map<String JavaDoc, Object JavaDoc> values = new HashMap<String JavaDoc, Object JavaDoc>();
48
49     public AnnotationHandler(Class JavaDoc annotationType, String JavaDoc asString, Map<String JavaDoc, Object JavaDoc> values) {
50         this.annotationType = annotationType;
51         this.asString = asString;
52         this.values = values;
53     }
54
55     public Object JavaDoc invoke(Object JavaDoc proxy, Method method, Object JavaDoc[] args) throws Throwable JavaDoc {
56         String JavaDoc name = method.getName();
57         if (args != null) {
58             if (name.equals("equals") && args.length == 1 && method.getParameterTypes()[0] == Object JavaDoc.class) {
59                 return args[0] instanceof Annotation_ && asString.equals(args[0].toString());
60             }
61             throw new IncompleteAnnotationException JavaDoc(annotationType, name);
62         }
63         if (name.equals("hashCode")) return asString.hashCode();
64         if (name.equals("toString")) return asString;
65         if (name.equals("annotationType")) return annotationType;
66         Object JavaDoc value = values.get(name);
67         if (value != null) return RuntimeTools.cloneNonEmptyArray(value);
68         throw new IncompleteAnnotationException JavaDoc(annotationType, name);
69     }
70
71 }
72
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