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Java > Open Source Codes > com > caucho > jstl > el > IfTag


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  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */
29
30 package com.caucho.jstl.el;
31
32 import com.caucho.el.Expr;
33 import com.caucho.jsp.PageContextImpl;
34 import com.caucho.util.L10N;
35
36 import javax.servlet.jsp.JspException JavaDoc;
37 import javax.servlet.jsp.tagext.TagSupport JavaDoc;
38
39 /**
40  * Tag representing an "if" condition.
41  */
42 public class IfTag extends TagSupport JavaDoc {
43   private static L10N L = new L10N(IfTag.class);
44   
45   private Expr _testExpr;
46   private String JavaDoc _var;
47   private String JavaDoc _scope;
48
49   /**
50    * Sets the JSP-EL expression value.
51    */
52   public void setTest(Expr test)
53   {
54     _testExpr = test;
55   }
56
57   /**
58    * Sets the variable which should contain the result of the test.
59    */
60   public void setVar(String JavaDoc var)
61   {
62     _var = var;
63   }
64
65   /**
66    * Sets the scope for the variable.
67    */
68   public void setScope(String JavaDoc scope)
69   {
70     _scope = scope;
71   }
72
73   /**
74    * Process the tag.
75    */
76   public int doStartTag()
77     throws JspException JavaDoc
78   {
79     try {
80       PageContextImpl pageContext = (PageContextImpl) this.pageContext;
81     
82       boolean test = _testExpr.evalBoolean(pageContext.getELContext());
83       Boolean JavaDoc value = test ? Boolean.TRUE : Boolean.FALSE;
84
85       if (_var == null) {
86       }
87       else
88     CoreSetTag.setValue(pageContext, _var, _scope, value);
89
90       return test ? EVAL_BODY_INCLUDE : SKIP_BODY;
91     } catch (Exception JavaDoc e) {
92       throw new JspException JavaDoc(e);
93     }
94   }
95 }
96
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