KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > commons > discovery > resource > classes > ResourceClassDiscoverImpl


1 /*
2  * ====================================================================
3  *
4  * The Apache Software License, Version 1.1
5  *
6  * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
7  * reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if
22  * any, must include the following acknowlegement:
23  * "This product includes software developed by the
24  * Apache Software Foundation (http://www.apache.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "The Jakarta Project", "Commons", and "Apache Software
29  * Foundation" must not be used to endorse or promote products derived
30  * from this software without prior written permission. For written
31  * permission, please contact apache@apache.org.
32  *
33  * 5. Products derived from this software may not be called "Apache"
34  * nor may "Apache" appear in their names without prior written
35  * permission of the Apache 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 APACHE SOFTWARE FOUNDATION OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals on behalf of the Apache Software Foundation. For more
53  * information on the Apache Software Foundation, please see
54  * <http://www.apache.org/>.
55  *
56  */
57
58 package org.apache.commons.discovery.resource.classes;
59
60 import org.apache.commons.discovery.*;
61 import org.apache.commons.discovery.ResourceClass;
62 import org.apache.commons.discovery.ResourceClassDiscover;
63 import org.apache.commons.discovery.resource.ClassLoaders;
64
65
66 /**
67  * @author Richard A. Sitze
68  */
69 public abstract class ResourceClassDiscoverImpl implements ResourceClassDiscover
70 {
71     private ClassLoaders classLoaders;
72     private ResourceClassListener listener = null;
73
74     
75     /**
76      * Construct a new resource discoverer
77      */
78     public ResourceClassDiscoverImpl() {
79         this(new ClassLoaders());
80     }
81     
82     /**
83      * Construct a new resource discoverer
84      */
85     public ResourceClassDiscoverImpl(ClassLoaders classLoaders) {
86         setClassLoaders(classLoaders);
87     }
88
89     /**
90      * Specify set of class loaders to be used in searching.
91      */
92     public void setClassLoaders(ClassLoaders loaders) {
93         classLoaders = loaders;
94     }
95
96     /**
97      * Specify a new class loader to be used in searching.
98      * The order of loaders determines the order of the result.
99      * It is recommended to add the most specific loaders first.
100      */
101     public void addClassLoader(ClassLoader JavaDoc loader) {
102         classLoaders.put(loader);
103     }
104     
105     protected ClassLoaders getClassLoaders() {
106         return classLoaders;
107     }
108     
109     public void setListener(ResourceClassListener listener) {
110         this.listener = listener;
111     }
112
113     protected boolean notifyListener(ResourceClass resource) {
114         return (listener == null) ? true : listener.found(resource);
115     }
116 }
117
Popular Tags