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Java > Open Source Codes > org > apache > commons > discovery > resource > names > NameDiscoverers


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57
58 package org.apache.commons.discovery.resource.names;
59
60 import java.util.Vector JavaDoc;
61
62 import org.apache.commons.discovery.ResourceNameDiscover;
63 import org.apache.commons.discovery.ResourceNameListener;
64 import org.apache.commons.discovery.log.DiscoveryLogFactory;
65 import org.apache.commons.logging.Log;
66
67
68 /**
69  * Holder for multiple ResourceNameDiscover instances.
70  * The result is the union of the results from each
71  * (not a chained sequence, where results feed the next in line.
72  *
73  * @author Richard A. Sitze
74  */
75 public class NameDiscoverers extends ResourceNameDiscoverImpl
76     implements ResourceNameDiscover, ResourceNameListener
77 {
78     private static Log log = DiscoveryLogFactory.newLog(NameDiscoverers.class);
79     public static void setLog(Log _log) {
80         log = _log;
81     }
82
83     private Vector JavaDoc discoverers = new Vector JavaDoc(); // ResourceNameDiscover
84
85     /**
86      * Construct a new resource name discoverer
87      */
88     public NameDiscoverers() {
89     }
90     
91     /**
92      * Specify an additional class loader to be used in searching.
93      * The order of loaders determines the order of the result.
94      * It is recommended to add the most specific loaders first.
95      */
96     public void addResourceNameDiscover(ResourceNameDiscover discover) {
97         if (discover != null) {
98             discover.setListener(getListener());
99             discoverers.addElement(discover);
100         }
101     }
102     
103     public void setListener(ResourceNameListener listener) {
104         super.setListener(listener);
105         for (int i = 0; i < discoverers.size(); i++) {
106             ((ResourceNameDiscover)discoverers.get(i)).setListener(listener);
107         }
108     }
109     
110     protected ResourceNameDiscover getResourceNameDiscover(int idx) {
111         return (ResourceNameDiscover)discoverers.get(idx);
112     }
113
114     protected int size() {
115         return discoverers.size();
116     }
117
118     /**
119      * Set of results of all discoverers.
120      *
121      * @return ResourceIterator
122      */
123     public boolean find(String JavaDoc resourceName) {
124         if (log.isDebugEnabled())
125             log.debug("find: resourceName='" + resourceName + "'");
126
127         for (int i = 0; i < discoverers.size(); i++) {
128             if (!((ResourceNameDiscover)discoverers.get(i)).find(resourceName)) {
129                 return false;
130             }
131         }
132         return true;
133     }
134     
135     public boolean found(String JavaDoc resourceName) {
136         return find(resourceName);
137     }
138 }
139
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