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.el;
30:
31: import com.caucho.el.*;
32: import com.caucho.jsp.PageContextImpl;
33: import com.caucho.vfs.WriteStream;
34: import com.caucho.util.*;
35:
36: import javax.el.*;
37: import javax.servlet.ServletContext;
38: import javax.servlet.http.Cookie;
39: import javax.servlet.http.HttpServletRequest;
40: import javax.servlet.jsp.PageContext;
41: import java.io.IOException;
42: import java.util.*;
43:
44: public class HeaderFieldExpression extends AbstractValueExpression {
45: private String _field;
46:
47: HeaderFieldExpression(String field) {
48: _field = field;
49: }
50:
51: /**
52: * Evaluate the expr as an object.
53: *
54: * @param env the page context
55: */
56: @Override
57: public Object getValue(ELContext env) throws ELException {
58: if (!(env instanceof ServletELContext)) {
59: ELResolver elResolver = env.getELResolver();
60: Object base = elResolver.getValue(env, null, "header");
61:
62: return elResolver.getValue(env, base, _field);
63: }
64:
65: ServletELContext servletEnv = (ServletELContext) env;
66:
67: return servletEnv.getHeader(_field);
68: }
69:
70: public String getExpressionString() {
71: return "header['" + _field + "']";
72: }
73: }
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