01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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;
36: import javax.servlet.jsp.JspException;
37: import javax.servlet.jsp.JspWriter;
38: import javax.servlet.jsp.tagext.JspFragment;
39: import java.io.Writer;
40: import java.util.logging.Logger;
41:
42: /**
43: * Abstract implementation for the fragment support.
44: */
45: public class ELExprFragment extends JspFragment {
46: private static final Logger 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: _pageContext = pageContext;
59: _expr = expr;
60: }
61:
62: /**
63: * Returns the JSP context.
64: */
65: public JspContext getJspContext() {
66: return _pageContext;
67: }
68:
69: /**
70: * The public JspFragment interface.
71: *
72: * @param out optional location for the output
73: * @param vars optional map to replace the page context
74: */
75: public void invoke(Writer out) throws JspException {
76: JspWriter oldOut = null;
77:
78: if (out != null)
79: oldOut = _pageContext.pushBody(out);
80:
81: try {
82: _expr.print(_pageContext.getOut(), _pageContext
83: .getELContext(), false);
84: } catch (RuntimeException e) {
85: throw e;
86: } catch (Exception e) {
87: throw new JspException(e);
88: } finally {
89: if (oldOut != null)
90: _pageContext.setWriter(oldOut);
91: }
92: }
93: }
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