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 JstlCoreRemove extends JstlNode {
38: private static final QName VAR = new QName("var");
39: private static final QName SCOPE = new QName("scope");
40:
41: private String _var;
42: private String _scope;
43:
44: /**
45: * Adds an attribute.
46: */
47: public void addAttribute(QName name, String value)
48: throws JspParseException {
49: if (VAR.equals(name))
50: _var = value;
51: else if (SCOPE.equals(name))
52: _scope = value;
53: else
54: throw error(L.l("`{0}' is an unknown attribute for <{1}>.",
55: name.getName(), getTagName()));
56: }
57:
58: /**
59: * Generates the XML text representation for the tag validation.
60: *
61: * @param os write stream to the generated XML.
62: */
63: public void printXml(WriteStream os) throws IOException {
64: os.print("<c:remove var=\"" + xmlText(_var) + "\"");
65:
66: if (_scope != null)
67: os.print(" scope=\"" + xmlText(_scope) + "\"");
68:
69: os.print("/>");
70: }
71:
72: /**
73: * Generates the code for the c:remove tag.
74: */
75: public void generate(JspJavaWriter out) throws Exception {
76: if (_var == null)
77: throw error(L.l(
78: "required attribute `var' missing from `{0}'",
79: getTagName()));
80:
81: if (_scope == null || _scope.equals("page")) {
82: out.println("pageContext.removeAttribute(\"" + _var
83: + "\");");
84: } else if (_scope.equals("request")) {
85: out.println("pageContext.getRequest().removeAttribute(\""
86: + _var + "\");");
87: } else if (_scope.equals("session")) {
88: out.println("pageContext.getSession().removeAttribute(\""
89: + _var + "\");");
90: } else if (_scope.equals("application")) {
91: out
92: .println("pageContext.getServletContext().removeAttribute(\""
93: + _var + "\");");
94: } else
95: throw error(L.l("invalid scope `{0}'", _scope));
96: }
97: }
|