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Java > Open Source Codes > net > sf > retrotranslator > runtime > java > lang > _Package


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.java.lang;
33
34 import java.security.*;
35 import net.sf.retrotranslator.runtime.impl.*;
36 import net.sf.retrotranslator.runtime.java.lang.annotation.Annotation_;
37
38 /**
39  * @author Taras Puchko
40  */

41 public class _Package {
42
43     public static Annotation_ getAnnotation(Package JavaDoc aPackage, Class JavaDoc annotationType) {
44         return getPackageInfo(aPackage).getAnnotation(annotationType);
45     }
46
47     public static Annotation_[] getAnnotations(Package JavaDoc aPackage) {
48         return getPackageInfo(aPackage).getAnnotations();
49     }
50
51     public static Annotation_[] getDeclaredAnnotations(Package JavaDoc aPackage) {
52         return getPackageInfo(aPackage).getDeclaredAnnotations();
53     }
54
55     public static boolean isAnnotationPresent(Package JavaDoc aPackage, Class JavaDoc annotationType) {
56         return getPackageInfo(aPackage).isAnnotationPresent(annotationType);
57     }
58
59     private static ClassDescriptor getPackageInfo(Package JavaDoc aPackage) {
60         String JavaDoc resourceName = "/" + aPackage.getName().replace('.', '/') + "/package-info.class";
61         ClassDescriptor packageInfo = createPackageInfo(_Package.class, resourceName);
62         return packageInfo != null ? packageInfo : getPrivilegedInfo(resourceName);
63     }
64
65     private static ClassDescriptor createPackageInfo(Class JavaDoc loader, String JavaDoc resourceName) {
66         byte[] bytecode = RuntimeTools.readResourceToByteArray(loader, resourceName);
67         return bytecode == null ? null : new ClassDescriptor(loader, bytecode);
68     }
69
70     private static ClassDescriptor getPrivilegedInfo(final String JavaDoc resourceName) {
71         return AccessController.doPrivileged(new PrivilegedAction<ClassDescriptor>() {
72             public ClassDescriptor run() {
73                 return getContextInfo(resourceName);
74             }
75         });
76     }
77
78     private static ClassDescriptor getContextInfo(String JavaDoc resourceName) {
79         try {
80             for (Class JavaDoc contextClass : new ExecutionContext().getClassContext()) {
81                 try {
82                     ClassDescriptor packageInfo = createPackageInfo(contextClass, resourceName);
83                     if (packageInfo != null) return packageInfo;
84                 } catch (Throwable JavaDoc e) {
85                     //continue;
86
}
87             }
88         } catch (Throwable JavaDoc e) {
89             //continue;
90
}
91         return ClassDescriptor.getInstance(_Package.class);
92     }
93
94     private static class ExecutionContext extends SecurityManager JavaDoc {
95         public Class JavaDoc[] getClassContext() {
96             return super.getClassContext();
97         }
98     }
99
100 }
101
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