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


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57
58 package org.apache.commons.discovery.resource.names;
59
60 import java.util.HashMap JavaDoc;
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.discovery.tools.ManagedProperties;
66 import org.apache.commons.logging.Log;
67
68
69 /**
70  * Recover resource name from Managed Properties,
71  * using OLD property names.
72  *
73  * This class maintains a mapping between old names and
74  * (new) the class names they represent. The discovery
75  * mechanism uses the class names as property names.
76  *
77  * @see org.apache.commons.discovery.tools.ManagedProperties
78  *
79  * @author Richard A. Sitze
80  */

81 public class DiscoverNamesInAlternateManagedProperties
82     extends ResourceNameDiscoverImpl
83     implements ResourceNameDiscover
84 {
85     private static Log log = DiscoveryLogFactory.newLog(DiscoverNamesInAlternateManagedProperties.class);
86     public static void setLog(Log _log) {
87         log = _log;
88     }
89
90     HashMap JavaDoc mapping = new HashMap JavaDoc();
91     
92     /** Construct a new resource discoverer
93      */

94     public DiscoverNamesInAlternateManagedProperties() {
95     }
96     
97     /**
98      */

99     public void addClassToPropertyNameMapping(String JavaDoc className, String JavaDoc propertyName) {
100         mapping.put(className, propertyName);
101     }
102
103     /**
104      * @return Enumeration of ResourceInfo
105      */

106     public ResourceNameIterator findResourceNames(final String JavaDoc resourceName) {
107         final String JavaDoc mappedName = (String JavaDoc)mapping.get(resourceName);
108
109         if (log.isDebugEnabled()) {
110             if (mappedName == null) {
111                 log.debug("find: resourceName='" + resourceName + "', no mapping");
112             } else {
113                 log.debug("find: resourceName='" + resourceName + "', lookup property '" + mappedName + "'");
114             }
115         }
116
117         return new ResourceNameIterator() {
118             private String JavaDoc resource =
119                 (mappedName == null) ? null : ManagedProperties.getProperty(mappedName);
120             
121             public boolean hasNext() {
122                 return resource != null;
123             }
124             
125             public String JavaDoc nextResourceName() {
126                 String JavaDoc element = resource;
127                 resource = null;
128                 return element;
129             }
130         };
131     }
132 }
133
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