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comparison src/com/go/trove/util/DelegateClassLoader.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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1 /* ====================================================================
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
3 * ====================================================================
4 * The Tea Software License, Version 1.1
5 *
6 * Copyright (c) 2000 Walt Disney Internet Group. 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 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. The end-user documentation included with the redistribution,
21 * if any, must include the following acknowledgment:
22 * "This product includes software developed by the
23 * Walt Disney Internet Group (http://opensource.go.com/)."
24 * Alternately, this acknowledgment may appear in the software itself,
25 * if and wherever such third-party acknowledgments normally appear.
26 *
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
28 * not be used to endorse or promote products derived from this
29 * software without prior written permission. For written
30 * permission, please contact opensource@dig.com.
31 *
32 * 5. Products derived from this software may not be called "Tea",
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
35 * written permission of the Walt Disney Internet Group.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * For more information about Tea, please see http://opensource.go.com/.
51 */
52
53 package com.go.trove.util;
54 import java.io.InputStream;
55 import java.net.URL;
56
57 /******************************************************************************
58 * ClassLoader that delegates class loading requests if the parent ClassLoader
59 * (and its ancestors) can't fulfill the request. Class loading requests are
60 * handed off to scouts, which are called upon in sequence to find the class,
61 * until the class is found. If neither the parent or scouts can find a
62 * requested class, a normal ClassNotFoundException is thrown.
63 *
64 * @author Brian S O'Neill
65 * @version
66 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 7/27/01 <!-- $-->
67 */
68 public class DelegateClassLoader extends ClassLoader {
69 private ClassLoader[] mScouts;
70
71 /**
72 * @param parent ClassLoader that gets first chance to load a class
73 * @param scouts ClassLoaders that get next chances to load a class, if the
74 * parent couldn't find it.
75 */
76 public DelegateClassLoader(ClassLoader parent, ClassLoader[] scouts) {
77 super(parent);
78 mScouts = (ClassLoader[])scouts.clone();
79 }
80
81 /**
82 * @param scouts ClassLoaders that get next chances to load a class, if the
83 * parent couldn't find it.
84 * @deprecated Actual parent ClassLoader must always be provided to prevent
85 * unexpected behavior.
86 */
87 public DelegateClassLoader(ClassLoader[] scouts) {
88 super();
89 mScouts = (ClassLoader[])scouts.clone();
90 }
91
92 protected synchronized Class findClass(String name)
93 throws ClassNotFoundException
94 {
95 for (int i=0; i<mScouts.length; i++) {
96 try {
97 return mScouts[i].loadClass(name);
98 }
99 catch (ClassNotFoundException e) {
100 }
101 }
102 throw new ClassNotFoundException(name);
103 }
104
105 protected URL findResource(String name) {
106 URL resource = null;
107
108 try {
109 for (int i=0; i<mScouts.length; i++) {
110 resource = mScouts[i].getResource(name);
111 if (resource != null) {
112 return resource;
113 }
114 }
115 }
116 catch (Exception e) {
117 e.printStackTrace();
118 }
119 return resource;
120 }
121 }