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Java > Open Source Codes > com > caucho > el > StringValueExpression


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * 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  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */
29
30 package com.caucho.el;
31
32 import com.caucho.util.L10N;
33
34 import javax.el.ELContext;
35 import javax.el.ELException;
36 import javax.el.PropertyNotFoundException;
37 import java.util.logging.Logger JavaDoc;
38
39 /**
40  * Abstract implementation class for an expression.
41  */
42 public class StringValueExpression extends AbstractValueExpression
43 {
44   protected static final Logger JavaDoc log
45     = Logger.getLogger(StringValueExpression.class.getName());
46   protected static final L10N L = new L10N(StringValueExpression.class);
47
48   private Class JavaDoc _expectedType;
49
50   public StringValueExpression(Expr expr,
51                    String JavaDoc expressionString,
52                    Class JavaDoc expectedType)
53   {
54     super(expr, expressionString);
55
56     _expectedType = expectedType;
57   }
58
59   public StringValueExpression(Expr expr,
60                    String JavaDoc expressionString)
61   {
62     super(expr, expressionString);
63   }
64
65   public StringValueExpression(Expr expr)
66   {
67     super(expr);
68   }
69
70   public Class JavaDoc<?> getExpectedType()
71   {
72     if (_expectedType != null)
73       return _expectedType;
74     else
75       return String JavaDoc.class;
76   }
77
78   public Class JavaDoc<?> getType(ELContext context)
79     throws PropertyNotFoundException,
80        ELException
81   {
82     return String JavaDoc.class;
83   }
84
85   @Override JavaDoc
86   public Object JavaDoc getValue(ELContext context)
87     throws PropertyNotFoundException,
88        ELException
89   {
90     return _expr.evalString(context);
91   }
92 }
93
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