1 /**
2 *
3 * Copyright 2005 The Apache Software Foundation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.geronimo.kernel.util;
18
19 import java.net.URLClassLoader;
20 import java.net.URL;
21 import org.apache.geronimo.kernel.config.MultiParentClassLoader;
22
23 /**
24 * Shows the ID and contents of a ClassLoader
25 *
26 * @version $Rev: 410741 $ $Date: 2006-05-31 21:35:48 -0700 (Wed, 31 May 2006) $
27 */
28 public class ClassLoaderDumper {
29 public static void dump(Object o) {
30 if(o != null) dump(o.getClass().getClassLoader());
31 }
32 public static void dump(Class cls) {
33 System.out.println("ClassLoader dump for "+cls.getName());
34 dump(cls.getClassLoader());
35 }
36 public static void dump(ClassLoader loader) {
37 dumpIDs("", loader);
38 dumpContents("", loader);
39 }
40 private static void dumpIDs(String prefix, ClassLoader loader) {
41 if(loader == null) return;
42 System.out.println(prefix+"ClassLoader is "+loader);
43
44 if(loader instanceof MultiParentClassLoader) {
45 MultiParentClassLoader mp = (MultiParentClassLoader) loader;
46 ClassLoader[] parents = mp.getParents();
47 for (int i = 0; i < parents.length; i++) {
48 dumpIDs(prefix+" ", parents[i]);
49 }
50 } else {
51 dumpIDs(prefix+" ", loader.getParent());
52 }
53 }
54 private static void dumpContents(String prefix, ClassLoader loader) {
55 if(loader == null) return;
56 System.out.println(prefix+"ClassLoader is "+loader);
57
58 if(loader instanceof URLClassLoader) {
59 URLClassLoader url = (URLClassLoader) loader;
60 URL[] entries = url.getURLs();
61 for (int i = 0; i < entries.length; i++) {
62 URL entry = entries[i];
63 System.out.println(prefix+" "+entry);
64 }
65 }
66 if(loader instanceof MultiParentClassLoader) {
67 MultiParentClassLoader mp = (MultiParentClassLoader) loader;
68 ClassLoader[] parents = mp.getParents();
69 for (int i = 0; i < parents.length; i++) {
70 dumpContents(prefix+" ", parents[i]);
71 }
72 } else {
73 dumpContents(prefix+" ", loader.getParent());
74 }
75 }
76 }