01: /*
02: * Javassist, a Java-bytecode translator toolkit.
03: * Copyright (C) 1999-2006 Shigeru Chiba. All Rights Reserved.
04: *
05: * The contents of this file are subject to the Mozilla Public License Version
06: * 1.1 (the "License"); you may not use this file except in compliance with
07: * the License. Alternatively, the contents of this file may be used under
08: * the terms of the GNU Lesser General Public License Version 2.1 or later.
09: *
10: * Software distributed under the License is distributed on an "AS IS" basis,
11: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12: * for the specific language governing rights and limitations under the
13: * License.
14: */
15:
16: package javassist;
17:
18: import java.io.InputStream;
19: import java.net.URL;
20:
21: /**
22: * A search-path for obtaining a class file
23: * by <code>getResourceAsStream()</code> in <code>java.lang.Class</code>.
24: *
25: * <p>Try adding a <code>ClassClassPath</code> when a program is running
26: * with a user-defined class loader and any class files are not found with
27: * the default <code>ClassPool</code>. For example,
28: *
29: * <ul><pre>
30: * ClassPool cp = ClassPool.getDefault();
31: * cp.insertClassPath(new ClassClassPath(this.getClass()));
32: * </pre></ul>
33: *
34: * This code snippet permanently adds a <code>ClassClassPath</code>
35: * to the default <code>ClassPool</code>. Note that the default
36: * <code>ClassPool</code> is a singleton. The added
37: * <code>ClassClassPath</code> uses a class object representing
38: * the class including the code snippet above.
39: *
40: * @see ClassPool#insertClassPath(ClassPath)
41: * @see ClassPool#appendClassPath(ClassPath)
42: * @see LoaderClassPath
43: */
44: public class ClassClassPath implements ClassPath {
45: private Class this Class;
46:
47: /** Creates a search path.
48: *
49: * @param c the <code>Class</code> object used to obtain a class
50: * file. <code>getResourceAsStream()</code> is called on
51: * this object.
52: */
53: public ClassClassPath(Class c) {
54: this Class = c;
55: }
56:
57: ClassClassPath() {
58: /* The value of thisClass was this.getClass() in early versions:
59: *
60: * thisClass = this.getClass();
61: *
62: * However, this made openClassfile() not search all the system
63: * class paths if javassist.jar is put in jre/lib/ext/
64: * (with JDK1.4).
65: */
66: this (java.lang.Object.class);
67: }
68:
69: /**
70: * Obtains a class file by <code>getResourceAsStream()</code>.
71: */
72: public InputStream openClassfile(String classname) {
73: String jarname = "/" + classname.replace('.', '/') + ".class";
74: return this Class.getResourceAsStream(jarname);
75: }
76:
77: /**
78: * Obtains the URL of the specified class file.
79: *
80: * @return null if the class file could not be found.
81: */
82: public URL find(String classname) {
83: String jarname = "/" + classname.replace('.', '/') + ".class";
84: return this Class.getResource(jarname);
85: }
86:
87: /**
88: * Does nothing.
89: */
90: public void close() {
91: }
92:
93: public String toString() {
94: return this Class.getName() + ".class";
95: }
96: }
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