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Java > Open Source Codes > org > apache > jetspeed > portal > portlets > FileWatchPortlet


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.portal.portlets;
18
19 //jetspeed
20 import org.apache.jetspeed.portal.expire.Expire;
21 import org.apache.jetspeed.portal.expire.ExpireFactory;
22 import org.apache.jetspeed.portal.expire.FileWatchExpire;
23 import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
24 import org.apache.jetspeed.services.logging.JetspeedLogger;
25 import org.apache.jetspeed.util.JetspeedException;
26
27
28 /**
29 Just like AbstractPortlet except that when its URL is modified on disk it
30 automatically expires itself.
31
32 @author <A HREF="mailto:burton@apache.org">Kevin A. Burton</A>
33 @version $Id: FileWatchPortlet.java,v 1.9 2004/02/23 04:03:34 jford Exp $
34 */
35 public abstract class FileWatchPortlet extends AbstractInstancePortlet
36 {
37
38     /**
39      * Static initialization of the logger for this class
40      */
41     private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(FileWatchPortlet.class.getName());
42     
43     FileWatchExpire expire = null;
44     
45     /**
46     Expire this Portlet if it's URL Changes on disk.
47     */
48     public Expire getExpire() {
49         
50         try {
51
52             if ( this.expire == null ) {
53             
54                 this.expire = (FileWatchExpire)ExpireFactory
55                     .getExpire( this, ExpireFactory.FILE_WATCH_EXPIRE );
56                 
57                 this.expire.setURL( this.getPortletConfig().getURL() );
58             }
59
60             return this.expire;
61
62         } catch ( JetspeedException e ) {
63             logger.error("Exception", e);
64             return null;
65         }
66
67         
68     }
69     
70 }
71
72
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