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17 package org.apache.commons.discovery.resource.names;
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19 import java.util.ArrayList;
20 import java.util.List;
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22 import org.apache.commons.discovery.ResourceNameDiscover;
23 import org.apache.commons.discovery.ResourceNameIterator;
24 import org.apache.commons.logging.Log;
25 import org.apache.commons.logging.LogFactory;
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33 public class NameDiscoverers extends ResourceNameDiscoverImpl implements ResourceNameDiscover {
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35 private static Log log = LogFactory.getLog(NameDiscoverers.class);
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43 @Deprecated
44 public static void setLog(Log _log) {
45 log = _log;
46 }
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48 private final List<ResourceNameDiscover> discoverers = new ArrayList<ResourceNameDiscover>();
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53 public NameDiscoverers() {
54 }
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63 public void addResourceNameDiscover(ResourceNameDiscover discover) {
64 if (discover != null) {
65 discoverers.add(discover);
66 }
67 }
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75 protected ResourceNameDiscover getResourceNameDiscover(int idx) {
76 return discoverers.get(idx);
77 }
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84 protected int size() {
85 return discoverers.size();
86 }
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91 @Override
92 public ResourceNameIterator findResourceNames(final String resourceName) {
93 if (log.isDebugEnabled()) {
94 log.debug("find: resourceName='" + resourceName + "'");
95 }
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97 return new ResourceNameIterator() {
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99 private int idx = 0;
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101 private ResourceNameIterator iterator = null;
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103 public boolean hasNext() {
104 if (iterator == null || !iterator.hasNext()) {
105 iterator = getNextIterator();
106 if (iterator == null) {
107 return false;
108 }
109 }
110 return iterator.hasNext();
111 }
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113 public String nextResourceName() {
114 return iterator.nextResourceName();
115 }
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117 private ResourceNameIterator getNextIterator() {
118 while (idx < size()) {
119 ResourceNameIterator iter =
120 getResourceNameDiscover(idx++).findResourceNames(resourceName);
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122 if (iter.hasNext()) {
123 return iter;
124 }
125 }
126 return null;
127 }
128 };
129 }
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131 }