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Java > Open Source Codes > org > apache > jetspeed > services > jsp > tags > JetspeedL10NTag


1 /*
2  * Copyright 2000-2001,2004 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 package org.apache.jetspeed.services.jsp.tags;
17
18 // Servlet API
19 import javax.servlet.jsp.JspException JavaDoc;
20 import javax.servlet.jsp.PageContext JavaDoc;
21 import javax.servlet.jsp.tagext.TagSupport JavaDoc;
22
23 // Turbine Classes
24 import org.apache.turbine.services.jsp.JspService;
25
26 // ECS support
27 import org.apache.ecs.ConcreteElement;
28 import org.apache.ecs.StringElement;
29
30 // Jetspeed support
31 import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
32 import org.apache.jetspeed.services.logging.JetspeedLogger;
33 import org.apache.jetspeed.services.rundata.JetspeedRunData;
34 import org.apache.jetspeed.services.customlocalization.CustomLocalizationTool;
35 import org.apache.jetspeed.services.customlocalization.CustomLocalization;
36
37 /**
38  * Supporting class for the localization (l10n) tag.
39  * Returns a localized text for string specified in the "key" parameter.
40  * Use "alt" parameter to specify a default value if "key" is not translated.
41  *
42  * @author <a HREF="mailto:morciuch@apache.org">Mark Orciuch</a>
43  * @version $Id: JetspeedL10NTag.java,v 1.6 2004/02/23 03:59:40 jford Exp $
44  */
45 public class JetspeedL10NTag extends TagSupport JavaDoc
46 {
47     /**
48      * Static initialization of the logger for this class
49      */
50     private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(JetspeedL10NTag.class.getName());
51     
52     private CustomLocalizationTool tool = null;
53
54     private String JavaDoc key = null;
55     private String JavaDoc alt = null;
56
57     public void setKey(String JavaDoc value)
58     {
59         this.key = value;
60     }
61
62     public String JavaDoc getKey()
63     {
64         return this.key;
65     }
66
67     public void setAlt(String JavaDoc value)
68     {
69         this.alt = value;
70     }
71
72     public String JavaDoc getAlt()
73     {
74         return this.alt;
75     }
76
77     /**
78      * Method called when the tag is encountered to send attributes to the
79      * output stream
80      *
81      * @return SKIP_BODY, as it is intended to be a single tag.
82      */
83     public int doStartTag() throws JspException JavaDoc
84     {
85         JetspeedRunData data = (JetspeedRunData) pageContext.getAttribute(JspService.RUNDATA, PageContext.REQUEST_SCOPE);
86
87         try
88         {
89             if (this.tool == null)
90             {
91                 this.tool = new CustomLocalizationTool();
92                 this.tool.init(data);
93             }
94             ConcreteElement result = null;
95             String JavaDoc def = this.alt != null && this.alt.trim().length() > 0 ? this.alt : this.key;
96
97             try
98             {
99                 String JavaDoc translation = this.tool.get(key, CustomLocalization.getLocale(data));
100                                 
101                 translation = translation == null ? def : translation;
102                 result = new StringElement(translation);
103             }
104             catch (Exception JavaDoc oe)
105             {
106                 result = new StringElement(def);
107                 logger.error("Exception", oe);
108             }
109
110             // Output the result
111 if (result != null)
112             {
113                 pageContext.getOut().print(result);
114             }
115
116         }
117         catch (Exception JavaDoc e)
118         {
119             String JavaDoc message = "Error processing key '" + this.key + "'.";
120             logger.error(message, e);
121             try
122             {
123                 data.getOut().print("Error translating key '" + this.key + "'. See log for more information.");
124             }
125             catch (java.io.IOException JavaDoc ioe)
126             {
127             }
128         }
129         return EVAL_BODY_INCLUDE;
130     }
131 }
132
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