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 HeaderExpression extends AbstractValueExpression implements
45: FieldGenerator {
46: public static final ValueExpression EXPR = new HeaderExpression();
47:
48: /**
49: * Creates a field reference using this expression as the base object.
50: *
51: * @param field the string reference for the field.
52: */
53: public ValueExpression createField(String field) {
54: return new HeaderFieldExpression(field);
55: }
56:
57: /**
58: * Evaluate the expr as an object.
59: *
60: * @param env the page context
61: */
62: @Override
63: public Object getValue(ELContext env) throws ELException {
64: if (!(env instanceof ServletELContext))
65: return env.getELResolver().getValue(env, null, "header");
66:
67: ServletELContext servletEnv = (ServletELContext) env;
68:
69: return servletEnv.getHeader();
70: }
71:
72: public String getExpressionString() {
73: return "header";
74: }
75: }
|