01: /* ====================================================================
02: The Jicarilla Software License
03:
04: Copyright (c) 2003 Leo Simons.
05: All rights reserved.
06:
07: Permission is hereby granted, free of charge, to any person obtaining
08: a copy of this software and associated documentation files (the
09: "Software"), to deal in the Software without restriction, including
10: without limitation the rights to use, copy, modify, merge, publish,
11: distribute, sublicense, and/or sell copies of the Software, and to
12: permit persons to whom the Software is furnished to do so, subject to
13: the following conditions:
14:
15: The above copyright notice and this permission notice shall be
16: included in all copies or substantial portions of the Software.
17:
18: THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19: EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20: MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21: IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
22: CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23: TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24: SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25: ==================================================================== */
26: package org.jicarilla.lang;
27:
28: /**
29: * @author <a href="lsimons at jicarilla dot org">Leo Simons</a>
30: * @version $Id: EquivalenceSelector.java,v 1.1 2004/03/23 13:37:57 lsimons Exp $
31: */
32: public class EquivalenceSelector implements CriterionExposingSelector {
33: Object m_object;
34:
35: public EquivalenceSelector(Object object) {
36: m_object = object;
37: }
38:
39: public boolean select(Object object) {
40: if (m_object == null)
41: return object == null;
42:
43: return m_object.equals(object);
44: }
45:
46: public Object getCriterion() {
47: return m_object;
48: }
49:
50: public boolean equals(Object o) {
51: if (!(o instanceof EquivalenceSelector))
52: return false;
53:
54: EquivalenceSelector es = (EquivalenceSelector) o;
55: if (getCriterion() == null)
56: return es.getCriterion() == null;
57: else
58: return getCriterion().equals(es.getCriterion());
59: }
60:
61: public int hashCode() {
62: if (getCriterion() == null)
63: return 10;
64: else
65: return getCriterion().hashCode() + 10;
66: }
67: }
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