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:
35: import javax.el.*;
36: import javax.servlet.ServletContext;
37: import javax.servlet.http.*;
38: import javax.servlet.jsp.PageContext;
39: import java.io.IOException;
40: import java.util.*;
41:
42: public class SessionExpression extends AbstractValueExpression
43: implements FieldGenerator {
44: public static final ValueExpression EXPR = new SessionExpression();
45:
46: /**
47: * Creates a field reference using this expression as the base object.
48: *
49: * @param field the string reference for the field.
50: */
51: public ValueExpression createField(String field) {
52: return new SessionFieldExpression(field);
53: }
54:
55: /**
56: * Evaluate the expr as an object.
57: *
58: * @param env the page context
59: */
60: @Override
61: public Object getValue(ELContext env) throws ELException {
62: if (!(env instanceof ServletELContext))
63: return env.getELResolver().getValue(env, null, "session");
64:
65: env.setPropertyResolved(true);
66:
67: ServletELContext servletEnv = (ServletELContext) env;
68:
69: HttpServletRequest req = servletEnv.getRequest();
70:
71: if (req != null) {
72: // jsf/160b
73: return req.getSession(true);
74: } else
75: return null;
76: }
77:
78: public String getExpressionString() {
79: return "session";
80: }
81: }
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