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Java > Open Source Codes > org > apache > commons > discovery > resource > ResourceDiscoverImpl


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57
58 package org.apache.commons.discovery.resource;
59
60 import org.apache.commons.discovery.*;
61 import org.apache.commons.discovery.Resource;
62 import org.apache.commons.discovery.ResourceDiscover;
63
64
65 /**
66  * Helper class for methods implementing the ResourceDiscover interface.
67  *
68  * @author Richard A. Sitze
69  */
70 public abstract class ResourceDiscoverImpl implements ResourceDiscover
71 {
72     private ClassLoaders classLoaders;
73     private ResourceListener listener = null;
74
75     
76     /**
77      * Construct a new resource discoverer
78      */
79     public ResourceDiscoverImpl() {
80         this(new ClassLoaders());
81     }
82     
83     /**
84      * Construct a new resource discoverer
85      */
86     public ResourceDiscoverImpl(ClassLoaders classLoaders) {
87         setClassLoaders(classLoaders);
88     }
89
90     /**
91      * Specify set of class loaders to be used in searching.
92      */
93     public void setClassLoaders(ClassLoaders loaders) {
94         classLoaders = loaders;
95     }
96
97     /**
98      * Specify a new class loader to be used in searching.
99      * The order of loaders determines the order of the result.
100      * It is recommended to add the most specific loaders first.
101      */
102     public void addClassLoader(ClassLoader JavaDoc loader) {
103         classLoaders.put(loader);
104     }
105     
106     protected ClassLoaders getClassLoaders() {
107         return classLoaders;
108     }
109     
110     public void setListener(ResourceListener listener) {
111         this.listener = listener;
112     }
113
114     protected boolean notifyListener(Resource resource) {
115         return (listener == null) ? true : listener.found(resource);
116     }
117 }
118
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