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: * 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.jsp.java;
30:
31: import com.caucho.jsp.JspParseException;
32: import com.caucho.vfs.WriteStream;
33: import com.caucho.xml.QName;
34:
35: import java.io.IOException;
36:
37: public class JstlCoreCatch extends JstlNode {
38: private static final QName VAR = new QName("var");
39:
40: private String _var;
41:
42: /**
43: * Adds an attribute.
44: */
45: public void addAttribute(QName name, String value)
46: throws JspParseException {
47: if (VAR.equals(name))
48: _var = value;
49: else
50: throw error(L.l("`{0}' is an unknown attribute for <{1}>.",
51: name, getTagName()));
52: }
53:
54: /**
55: * Generates the XML text representation for the tag validation.
56: *
57: * @param os write stream to the generated XML.
58: */
59: public void printXml(WriteStream os) throws IOException {
60: os.print("<c:catch");
61:
62: if (_var != null)
63: os.print(" var=\"" + xmlText(_var) + "\"");
64:
65: os.print(">");
66:
67: printXmlChildren(os);
68:
69: os.print("</c:catch>");
70: }
71:
72: /**
73: * Generates the code for the c:catch tag.
74: */
75: public void generate(JspJavaWriter out) throws Exception {
76: String temp = "_jsp_out" + _gen.uniqueId();
77:
78: out.println("javax.servlet.jsp.JspWriter " + temp + " = out;");
79: out.println("try {");
80: out.pushDepth();
81:
82: generateChildren(out);
83:
84: if (_var != null)
85: out.println("pageContext.removeAttribute(\"" + _var
86: + "\");");
87:
88: out.popDepth();
89: out.println("} catch (Throwable _jsp_exn) {");
90:
91: out.println(" out = pageContext.setWriter(" + temp + ");");
92:
93: if (_var != null)
94: out.println(" pageContext.setAttribute(\"" + _var
95: + "\", _jsp_exn);");
96:
97: out.println("}");
98: }
99: }
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