1 /*
2 Wotonomy: OpenStep design patterns for pure Java applications.
3 Copyright (C) 2001 Intersect Software Corporation
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, see http://www.gnu.org
17 */
18
19 package net.wotonomy.control;
20
21 import net.wotonomy.foundation.internal.WotonomyException;
22
23 /***
24 * EONotQualifiier negates a specified qualifier,
25 * evaluating to the opposite of the specified qualifier.
26 *
27 * @author michael@mpowers.net
28 * @author yjcheung@intersectsoft.com
29 * @author $Author: cgruber $
30 * @version $Revision: 894 $
31 */
32 public class EONotQualifier extends EOQualifier
33 implements EOKeyValueArchiving, EOQualifierEvaluation
34 {
35 private EOQualifier qualifier;
36
37 public EONotQualifier(
38 EOQualifier aQualifier )
39 {
40 qualifier = aQualifier;
41 }
42
43 /***
44 * Returns the qualifier that this qualifier negates.
45 */
46 public EOQualifier qualifier()
47 {
48 return qualifier;
49 }
50
51 /***
52 * Evaluates this qualifier for the specified object,
53 * and returns whether the object is qualified.
54 * evaluateWithObject is invoked on qualifier
55 * and the result is negated and returned.
56 */
57 public boolean evaluateWithObject( Object anObject )
58 {
59 return !(qualifier.evaluateWithObject(anObject));
60 }
61
62 /***
63 * Returns a string representation of this qualifier.
64 */
65 public String toString()
66 {
67 return (new StringBuffer("Not ").append(qualifier.toString()).toString());
68 }
69
70 public static Object decodeWithKeyValueUnarchiver(EOKeyValueUnarchiver arch) {
71 EOQualifier q = (EOQualifier)arch.decodeObjectForKey("qualifier");
72 if (q == null)
73 return null;
74 return new EONotQualifier(q);
75 }
76
77 public void encodeWithKeyValueArchiver(EOKeyValueArchiver arch) {
78 arch.encodeObject("EONotQualifier", "class");
79 if (qualifier instanceof EOKeyValueArchiving) {
80 EOKeyValueArchiver ar2 = new EOKeyValueArchiver();
81 ((EOKeyValueArchiving)qualifier).encodeWithKeyValueArchiver(ar2);
82 arch.encodeObject(ar2.dictionary(), "qualifiers");
83 } else
84 throw new WotonomyException("Cannot archive instance of " + qualifier.getClass().getName());
85 }
86
87 }
88
89 /*
90 * $Log$
91 * Revision 1.2 2006/02/16 16:47:14 cgruber
92 * Move some classes in to "internal" packages and re-work imports, etc.
93 *
94 * Also use UnsupportedOperationExceptions where appropriate, instead of WotonomyExceptions.
95 *
96 * Revision 1.1 2006/02/16 13:19:57 cgruber
97 * Check in all sources in eclipse-friendly maven-enabled packages.
98 *
99 * Revision 1.9 2003/08/12 01:43:04 chochos
100 * formally implement EOQualifierEvaluation
101 *
102 * Revision 1.8 2003/08/11 19:39:30 chochos
103 * special conditions for NSKeyValueCoding.NullValue -> EONull
104 *
105 * Revision 1.7 2003/08/09 01:24:19 chochos
106 * implements EOKeyValueArchiving
107 *
108 * Revision 1.6 2003/08/06 23:07:52 chochos
109 * general code cleanup (mostly, removing unused imports)
110 *
111 * Revision 1.5 2001/10/31 15:25:14 mpowers
112 * Cleanup of qualifiers.
113 *
114 * Revision 1.4 2001/10/30 22:57:28 mpowers
115 * EOQualifier framework is now working.
116 *
117 * Revision 1.3 2001/09/13 15:42:20 mpowers
118 * Fixed another cut/paste typo.
119 *
120 * Revision 1.2 2001/09/13 15:41:34 mpowers
121 * Fixed typo.
122 *
123 * Revision 1.1 2001/09/13 15:38:19 mpowers
124 * Started implementation of the EOQualifier framework.
125 *
126 *
127 */
128
129