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Java > Open Source Codes > com > caucho > jstl > el > 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.el;
30
31 import com.caucho.el.Expr;
32 import com.caucho.jsp.PageContextImpl;
33 import com.caucho.util.L10N;
34
35 import javax.servlet.jsp.JspException JavaDoc;
36 import javax.servlet.jsp.tagext.TagSupport JavaDoc;
37 import javax.servlet.jsp.tagext.TryCatchFinally JavaDoc;
38 import java.util.TimeZone JavaDoc;
39
40 /**
41  * Sets the i18n localization bundle for a context.
42  */
43 public class FmtTimeZoneTag extends TagSupport JavaDoc implements TryCatchFinally JavaDoc {
44   private static L10N L = new L10N(FmtTimeZoneTag.class);
45   
46   private Expr _valueExpr;
47
48   private Object JavaDoc _oldTimeZone;
49   
50   /**
51    * Sets the JSP-EL expression for the basename.
52    */
53   public void setValue(Expr value)
54   {
55     _valueExpr = value;
56   }
57
58   /**
59    * Process the tag.
60    */
61   public int doStartTag()
62     throws JspException JavaDoc
63   {
64     try {
65       PageContextImpl pc = (PageContextImpl) pageContext;
66
67       _oldTimeZone = pc.getAttribute("com.caucho.time-zone");
68
69       Object JavaDoc valueObj = _valueExpr.evalObject(pc.getELContext());
70       TimeZone JavaDoc timeZone = null;
71
72       if (valueObj instanceof TimeZone JavaDoc) {
73     timeZone = (TimeZone JavaDoc) valueObj;
74       }
75       else if (valueObj instanceof String JavaDoc) {
76     String JavaDoc string = (String JavaDoc) valueObj;
77     string = string.trim();
78
79     if (string.equals(""))
80       timeZone = TimeZone.getTimeZone("GMT");
81     else
82       timeZone = TimeZone.getTimeZone(string);
83       }
84       else
85     timeZone = TimeZone.getTimeZone("GMT");
86
87       pc.setAttribute("com.caucho.time-zone", timeZone);
88
89       return EVAL_BODY_INCLUDE;
90     } catch (Exception JavaDoc e) {
91       throw new JspException JavaDoc(e);
92     }
93   }
94
95   /**
96    * Handle the catch
97    */
98   public void doCatch(Throwable JavaDoc t)
99     throws Throwable JavaDoc
100   {
101     throw t;
102   }
103   
104   /**
105    * Handle the finaly
106    */
107   public void doFinally()
108   {
109     if (_oldTimeZone == null)
110       pageContext.removeAttribute("com.caucho.time-zone");
111     else
112       pageContext.setAttribute("com.caucho.time-zone", _oldTimeZone);
113   }
114 }
115
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