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Java > Open Source Codes > org > apache > jetspeed > om > registry > base > BaseMediaTypeRegistry


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.apache.jetspeed.om.registry.base;
18
19 import org.apache.jetspeed.om.registry.MediaTypeRegistry;
20 import org.apache.jetspeed.om.registry.MediaTypeEntry;
21 import org.apache.jetspeed.om.registry.RegistryEntry;
22 import org.apache.jetspeed.om.registry.InvalidEntryException;
23 import org.apache.jetspeed.om.registry.RegistryException;
24 import org.apache.jetspeed.services.Registry;
25 import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
26 import org.apache.jetspeed.services.logging.JetspeedLogger;
27 import org.apache.jetspeed.capability.CapabilityMap;
28
29 import java.util.Iterator JavaDoc;
30 import java.util.Enumeration JavaDoc;
31 import java.util.List JavaDoc;
32 import java.util.ArrayList JavaDoc;
33
34 /**
35  * Extends BaseRegistry implementation to override object creation
36  * method
37  *
38  * @author <a HREF="mailto:raphael@apache.org">Raphaël Luta</a>
39  * @version $Id: BaseMediaTypeRegistry.java,v 1.7 2004/02/23 03:08:26 jford Exp $
40  */
41 public class BaseMediaTypeRegistry extends BaseOrderedRegistry
42         implements MediaTypeRegistry
43 {
44
45     /**
46      * Static initialization of the logger for this class
47      */
48     private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(BaseMediaTypeRegistry.class.getName());
49     
50     /*
51      * Find media-types in this registry that match the CapabilityMap requirements
52      *
53      * @param category The category and optional subcategories.
54      * @return Iterator The result as an iterator.
55      */
56     public Iterator JavaDoc findForCapability(CapabilityMap cm)
57     {
58         if (cm == null)
59         {
60             return null;
61         }
62
63         String JavaDoc type = cm.getPreferredType().getContentType();
64         List JavaDoc result = new ArrayList JavaDoc();
65
66         if ( logger.isDebugEnabled() )
67         {
68             logger.debug("MediaTypeRegistry: looking for type " + type );
69         }
70
71         if (type == null)
72         {
73             return result.iterator();
74         }
75
76         try
77         {
78             Enumeration JavaDoc en = getEntries();
79             while(en.hasMoreElements())
80             {
81                 MediaTypeEntry mte = (MediaTypeEntry)en.nextElement();
82
83                 if ( logger.isDebugEnabled() )
84                 {
85                     logger.debug("MediaTypeRegistry: found MediaTypeEntry for type " + mte.getMimeType() );
86                 }
87                 if (type.equals(mte.getMimeType()))
88                 {
89                     result.add(mte);
90                 }
91             }
92         }
93         catch(Exception JavaDoc e)
94         {
95             logger.error("Exception", e);
96         }
97
98         if ( logger.isDebugEnabled() )
99         {
100             logger.debug("MediaTypeRegistry: found " + result.size() + " entries." );
101         }
102
103         return result.iterator();
104
105     }
106
107     /**
108     @see Registry#setEntry
109     */
110     public void setEntry( RegistryEntry entry ) throws InvalidEntryException
111     {
112         // Delegate to the RegistryService to ensure correct handling of
113 // persistence if using file fragments
114
115         try
116         {
117             Registry.addEntry(Registry.MEDIA_TYPE, entry);
118         }
119         catch (RegistryException e)
120         {
121             logger.error("Exception", e);
122         }
123     }
124
125     /**
126     @see Registry#addEntry
127     */
128     public void addEntry( RegistryEntry entry ) throws InvalidEntryException
129     {
130         // Delegate to the RegistryService to ensure correct handling of
131 // persistence if using file fragments
132
133         try
134         {
135             Registry.addEntry(Registry.MEDIA_TYPE, entry);
136         }
137         catch (RegistryException e)
138         {
139             logger.error("Exception", e);
140         }
141     }
142
143     /**
144     @see Registry#removeEntry
145     */
146     public void removeEntry( String JavaDoc name )
147     {
148         // Delegate to the RegistryService to ensure correct handling of
149 // persistence if using file fragments
150
151         Registry.removeEntry(Registry.MEDIA_TYPE, name);
152     }
153
154     /**
155     @see Registry#removeEntry
156     */
157     public void removeEntry( RegistryEntry entry )
158     {
159         // Delegate to the RegistryService to ensure correct handling of
160 // persistence if using file fragments
161
162         if (entry != null)
163         {
164             Registry.removeEntry(Registry.MEDIA_TYPE, entry.getName());
165         }
166     }
167
168     /**
169      * Creates a new RegistryEntry instance compatible with the current
170      * Registry instance implementation
171      *
172      * @return the newly created RegistryEntry
173      */
174     public RegistryEntry createEntry()
175     {
176         return new BaseMediaTypeEntry();
177     }
178 }
179
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