blob: a1580537a026982508fe72ce61236b0e97f43cf5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist;
import java.io.InputStream;
import java.net.URL;
import java.lang.ref.WeakReference;
/**
* A class search-path representing a class loader.
*
* <p>It is used for obtaining a class file from the given
* class loader by <code>getResourceAsStream()</code>.
* The <code>LoaderClassPath</code> refers to the class loader through
* <code>WeakReference</code>. If the class loader is garbage collected,
* the other search pathes are examined.
*
* <p>The given class loader must have both <code>getResourceAsStream()</code>
* and <code>getResource()</code>.
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @author Shigeru Chiba
*
* @see ClassPool#insertClassPath(ClassPath)
* @see ClassPool#appendClassPath(ClassPath)
* @see ClassClassPath
*/
public class LoaderClassPath implements ClassPath {
private WeakReference clref;
/**
* Creates a search path representing a class loader.
*/
public LoaderClassPath(ClassLoader cl) {
clref = new WeakReference(cl);
}
public String toString() {
Object cl = null;
if (clref != null)
cl = clref.get();
return cl == null ? "<null>" : cl.toString();
}
/**
* Obtains a class file from the class loader.
* This method calls <code>getResourceAsStream(String)</code>
* on the class loader.
*/
public InputStream openClassfile(String classname) {
String cname = classname.replace('.', '/') + ".class";
ClassLoader cl = (ClassLoader)clref.get();
if (cl == null)
return null; // not found
else
return cl.getResourceAsStream(cname);
}
/**
* Obtains the URL of the specified class file.
* This method calls <code>getResource(String)</code>
* on the class loader.
*
* @return null if the class file could not be found.
*/
public URL find(String classname) {
String cname = classname.replace('.', '/') + ".class";
ClassLoader cl = (ClassLoader)clref.get();
if (cl == null)
return null; // not found
else
return cl.getResource(cname);
}
/**
* Closes this class path.
*/
public void close() {
clref = null;
}
}
|
