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1
9
10 package org.picocontainer.defaults;
11
12 import java.net.URL  ;
13 import java.net.URLClassLoader ;
14 import java.security.AccessController ;
15 import java.security.CodeSource ;
16 import java.security.PermissionCollection ;
17 import java.security.Permissions ;
18 import java.security.PrivilegedAction ;
19 import java.util.Map ;
20
21
30 public class CustomPermissionsURLClassLoader extends URLClassLoader {
31 private final Map permissionsMap;
32
33 public CustomPermissionsURLClassLoader(URL [] urls, Map permissionsMap, ClassLoader parent) {
34 super(urls, parent);
35 this.permissionsMap = permissionsMap;
36 }
37
38 public Class loadClass(String name) throws ClassNotFoundException {
39 try {
40 return super.loadClass(name);
41 } catch (ClassNotFoundException e) {
42 throw decorateException(name, e);
43 }
44 }
45
46 protected Class findClass(String name) throws ClassNotFoundException {
47 try {
48 return super.findClass(name);
49 } catch (ClassNotFoundException e) {
50 throw decorateException(name, e);
51 }
52 }
53
54 private ClassNotFoundException decorateException(String name, ClassNotFoundException e) {
55 if (name.startsWith("class ")) {
56 return new ClassNotFoundException ("Class '" + name + "' is not a classInstance.getName(). " +
57 "It's a classInstance.toString(). The clue is that it starts with 'class ', no classname contains a space.");
58 }
59 ClassLoader classLoader = this;
60 StringBuffer sb = new StringBuffer ("'").append(name).append("' classloader stack [");
61 while (classLoader != null) {
62 sb.append(classLoader.toString()).append("\n");
63 final ClassLoader cl = classLoader;
64 classLoader = (ClassLoader ) AccessController.doPrivileged(new PrivilegedAction () {
65 public Object run() {
66 return cl.getParent();
67 }
68 });
69
70 }
71 return new ClassNotFoundException (sb.append("]").toString(), e);
72 }
73
74 public String toString() {
75 String result = CustomPermissionsURLClassLoader.class.getName() + " " + System.identityHashCode(this) + ":";
76 URL [] urls = getURLs();
77 for (int i = 0; i < urls.length; i++) {
78 URL url = urls[i];
79 result += "\n\t" + url.toString();
80 }
81
82 return result;
83 }
84
85 public PermissionCollection getPermissions(CodeSource codeSource) {
86 return (Permissions ) permissionsMap.get(codeSource.getLocation());
87 }
88
89 }
90
91 |
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Java API By Example, From Geeks To Geeks.