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Java > Open Source Codes > com > caucho > jsp > ELExprFragment


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.jsp;
31
32 import com.caucho.el.Expr;
33 import com.caucho.log.Log;
34
35 import javax.servlet.jsp.JspContext JavaDoc;
36 import javax.servlet.jsp.JspException JavaDoc;
37 import javax.servlet.jsp.JspWriter JavaDoc;
38 import javax.servlet.jsp.tagext.JspFragment JavaDoc;
39 import java.io.Writer JavaDoc;
40 import java.util.logging.Logger JavaDoc;
41
42 /**
43  * Abstract implementation for the fragment support.
44  */
45 public class ELExprFragment extends JspFragment JavaDoc {
46   private static final Logger JavaDoc log = Log.open(ELExprFragment.class);
47
48   // the page context
49 private PageContextImpl _pageContext;
50   
51   // the expression
52 private Expr _expr;
53
54   /**
55    * Creates the fragment.
56    */
57   public ELExprFragment(PageContextImpl pageContext, Expr expr)
58   {
59     _pageContext = pageContext;
60     _expr = expr;
61   }
62
63   /**
64    * Returns the JSP context.
65    */
66   public JspContext JavaDoc getJspContext()
67   {
68     return _pageContext;
69   }
70
71   /**
72    * The public JspFragment interface.
73    *
74    * @param out optional location for the output
75    * @param vars optional map to replace the page context
76    */
77   public void invoke(Writer JavaDoc out)
78     throws JspException JavaDoc
79   {
80     JspWriter JavaDoc oldOut = null;
81
82     if (out != null)
83       oldOut = _pageContext.pushBody(out);
84
85     try {
86       _expr.print(_pageContext.getOut(), _pageContext.getELContext(), false);
87     } catch (RuntimeException JavaDoc e) {
88       throw e;
89     } catch (Exception JavaDoc e) {
90       throw new JspException JavaDoc(e);
91     } finally {
92       if (oldOut != null)
93         _pageContext.setWriter(oldOut);
94     }
95   }
96 }
97
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