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1
57
58 package org.apache.commons.discovery.resource.names;
59
60 import java.util.Hashtable  ;
61
62 import org.apache.commons.discovery.ResourceNameDiscover;
63 import org.apache.commons.discovery.ResourceNameIterator;
64 import org.apache.commons.discovery.log.DiscoveryLogFactory;
65 import org.apache.commons.logging.Log;
66
67
68
80 public class DiscoverMappedNames
81 extends ResourceNameDiscoverImpl
82 implements ResourceNameDiscover
83 {
84 private static Log log = DiscoveryLogFactory.newLog(DiscoverMappedNames.class);
85 public static void setLog(Log _log) {
86 log = _log;
87 }
88
89 private Hashtable mapping = new Hashtable ();
91
93 public DiscoverMappedNames() {
94 }
95
96 public void map(String fromName, String toName) {
97 mapping.put(fromName, toName);
98 }
99
100 public void map(String fromName, String [] toNames) {
101 mapping.put(fromName, toNames);
102 }
103
104
107 public ResourceNameIterator findResourceNames(final String resourceName) {
108 if (log.isDebugEnabled()) {
109 log.debug("find: resourceName='" + resourceName + "', mapping to constants");
110 }
111
112 final Object obj = mapping.get(resourceName);
113
114 final String [] names;
115 if (obj instanceof String ) {
116 names = new String [] { (String )obj };
117 } else if (obj instanceof String []) {
118 names = (String [])obj;
119 } else {
120 names = null;
121 }
122
123 return new ResourceNameIterator() {
124
125 private int idx = 0;
126
127 public boolean hasNext() {
128 if (names != null) {
129 while (idx < names.length && names[idx] == null) {
130 idx++;
131 }
132 return idx < names.length;
133 }
134 return false;
135 }
136
137 public String nextResourceName() {
138 return hasNext() ? names[idx++] : null;
139 }
140 };
141 }
142 }
143 |
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