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 javax.el.*;
32:
33: abstract public class AbstractValueExpression extends ValueExpression {
34: public boolean isReadOnly(ELContext env) {
35: env.setPropertyResolved(true);
36:
37: return true;
38: }
39:
40: public boolean isLiteralText() {
41: return false;
42: }
43:
44: public Class getType(ELContext env) {
45: Object value = getValue(env);
46:
47: if (env.isPropertyResolved())
48: return value.getClass();
49: else
50: return null;
51: }
52:
53: public Class getExpectedType() {
54: return Object.class;
55: }
56:
57: public void setValue(ELContext env, Object value) {
58: throw new PropertyNotWritableException(getClass().getName());
59: }
60:
61: public int hashCode() {
62: return getExpressionString().hashCode();
63: }
64:
65: public boolean equals(Object o) {
66: return (this == o);
67: }
68:
69: public String toString() {
70: return getExpressionString();
71: }
72: }
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