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: import java.util.regex.Pattern;
29:
30: /**
31: * A {@link Selector} which matches the string representation of an object
32: * against the provided regular expression pattern.
33: *
34: * @author <a href="lsimons at jicarilla dot org">Leo Simons</a>
35: * @version $Id: RegexpSelector.java,v 1.1 2004/03/23 13:37:58 lsimons Exp $
36: */
37: public class RegexpSelector implements CriterionExposingSelector {
38: /** The regular expression to match against. */
39: protected final Pattern m_pattern;
40:
41: /**
42: * Create a new instance using the specified pattern.
43: *
44: * @param pattern the regular expression to match against
45: */
46: public RegexpSelector(final Pattern pattern) {
47: Assert.assertNotNull("pattern argument may not be null",
48: pattern);
49: m_pattern = pattern;
50: }
51:
52: /**
53: * Match the provided parameter against the pattern of this selector, or
54: * against "null" if the provided parameter is null.
55: *
56: * @param object the object to test
57: * @return true if the object is selected, false otherwise
58: */
59: public boolean select(final Object object) {
60: if (object != null) {
61: return m_pattern.matcher(object.toString()).matches();
62: } else {
63: return m_pattern.matcher("null").matches();
64: }
65: }
66:
67: public Object getCriterion() {
68: return m_pattern;
69: }
70:
71: public boolean equals(Object o) {
72: if (!(o instanceof RegexpSelector))
73: return false;
74:
75: RegexpSelector es = (RegexpSelector) o;
76: return ((Pattern) getCriterion()).pattern().equals(
77: ((Pattern) es.getCriterion()).pattern());
78: }
79:
80: public int hashCode() {
81: return ((Pattern) getCriterion()).pattern().hashCode() + 20;
82: }
83: }
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