01: //--------------------------------------------------------------------------
02: // Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
03: // All rights reserved.
04: //
05: // Redistribution and use in source and binary forms, with or without
06: // modification, are permitted provided that the following conditions are
07: // met:
08: //
09: // Redistributions of source code must retain the above copyright notice,
10: // this list of conditions and the following disclaimer.
11: // Redistributions in binary form must reproduce the above copyright
12: // notice, this list of conditions and the following disclaimer in the
13: // documentation and/or other materials provided with the distribution.
14: // Neither the name of the Drew Davidson nor the names of its contributors
15: // may be used to endorse or promote products derived from this software
16: // without specific prior written permission.
17: //
18: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21: // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22: // COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23: // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24: // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25: // OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26: // AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27: // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
28: // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
29: // DAMAGE.
30: //--------------------------------------------------------------------------
31: package ognl;
32:
33: import java.util.*;
34:
35: /**
36: * Implementation of PropertyAccessor that provides "property" reference to
37: * "nextElement" (aliases to "next" also) and "hasMoreElements" (also aliased
38: * to "hasNext").
39: * @author Luke Blanshard (blanshlu@netscape.net)
40: * @author Drew Davidson (drew@ognl.org)
41: */
42: public class EnumerationPropertyAccessor extends ObjectPropertyAccessor
43: implements PropertyAccessor // This is here to make javadoc show this class as an implementor
44: {
45: public Object getProperty(Map context, Object target, Object name)
46: throws OgnlException {
47: Object result;
48: Enumeration e = (Enumeration) target;
49:
50: if (name instanceof String) {
51: if (name.equals("next") || name.equals("nextElement")) {
52: result = e.nextElement();
53: } else {
54: if (name.equals("hasNext")
55: || name.equals("hasMoreElements")) {
56: result = e.hasMoreElements() ? Boolean.TRUE
57: : Boolean.FALSE;
58: } else {
59: result = super .getProperty(context, target, name);
60: }
61: }
62: } else {
63: result = super .getProperty(context, target, name);
64: }
65: return result;
66: }
67:
68: public void setProperty(Map context, Object target, Object name,
69: Object value) throws OgnlException {
70: throw new IllegalArgumentException("can't set property " + name
71: + " on Enumeration");
72: }
73: }
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