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Java > Open Source Codes > com > caucho > jstl > rt > FmtTimeZoneTag


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.jstl.rt;
30
31 import com.caucho.jsp.PageContextImpl;
32 import com.caucho.util.L10N;
33
34 import javax.servlet.jsp.JspException JavaDoc;
35 import javax.servlet.jsp.tagext.TagSupport JavaDoc;
36 import javax.servlet.jsp.tagext.TryCatchFinally JavaDoc;
37 import java.util.TimeZone JavaDoc;
38
39 /**
40  * Sets the i18n localization bundle for a context.
41  */
42 public class FmtTimeZoneTag extends TagSupport JavaDoc implements TryCatchFinally JavaDoc {
43   private static L10N L = new L10N(FmtTimeZoneTag.class);
44   
45   private Object JavaDoc _value;
46
47   private Object JavaDoc _oldTimeZone;
48   
49   /**
50    * Sets the JSP-EL expression for the basename.
51    */
52   public void setValue(Object JavaDoc value)
53   {
54     _value = value;
55   }
56
57   /**
58    * Process the tag.
59    */
60   public int doStartTag()
61     throws JspException JavaDoc
62   {
63     PageContextImpl pc = (PageContextImpl) pageContext;
64
65     _oldTimeZone = pc.getAttribute("com.caucho.time-zone");
66
67     Object JavaDoc valueObj = _value;
68     TimeZone JavaDoc timeZone = null;
69
70     if (valueObj instanceof TimeZone JavaDoc) {
71       timeZone = (TimeZone JavaDoc) valueObj;
72     }
73     else if (valueObj instanceof String JavaDoc) {
74       String JavaDoc string = (String JavaDoc) valueObj;
75       string = string.trim();
76
77       if (string.equals(""))
78         timeZone = TimeZone.getTimeZone("GMT");
79       else
80         timeZone = TimeZone.getTimeZone(string);
81     }
82     else
83       timeZone = TimeZone.getTimeZone("GMT");
84
85     pc.setAttribute("com.caucho.time-zone", timeZone);
86
87     return EVAL_BODY_INCLUDE;
88   }
89
90   /**
91    * Handle the catch
92    */
93   public void doCatch(Throwable JavaDoc t)
94     throws Throwable JavaDoc
95   {
96     throw t;
97   }
98   
99   /**
100    * Handle the finaly
101    */
102   public void doFinally()
103   {
104     if (_oldTimeZone == null)
105       pageContext.removeAttribute("com.caucho.time-zone");
106     else
107       pageContext.setAttribute("com.caucho.time-zone", _oldTimeZone);
108   }
109 }
110
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