01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * published by the Free Software Foundation; either version 2.1 of
10: * the License, or (at your option) any later version.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this software; if not, write to the Free
19: * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21: */
22: package org.jboss.ejb.plugins.cmp.jdbc;
23:
24: import org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge;
25:
26: /**
27: * This class represents one pair of entities in a relation.
28: *
29: * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
30: * @version $Revision: 57209 $
31: */
32: public final class RelationPair {
33: private final JDBCCMRFieldBridge leftCMRField;
34: private final JDBCCMRFieldBridge rightCMRField;
35:
36: private final Object leftId;
37: private final Object rightId;
38:
39: public RelationPair(JDBCCMRFieldBridge leftCMRField, Object leftId,
40: JDBCCMRFieldBridge rightCMRField, Object rightId) {
41:
42: this .leftCMRField = leftCMRField;
43: this .leftId = leftId;
44:
45: this .rightCMRField = rightCMRField;
46: this .rightId = rightId;
47: }
48:
49: public Object getLeftId() {
50: return leftId;
51: }
52:
53: public Object getRightId() {
54: return rightId;
55: }
56:
57: public boolean equals(Object obj) {
58: if (obj instanceof RelationPair) {
59: RelationPair pair = (RelationPair) obj;
60:
61: // check left==left and right==right
62: if (leftCMRField == pair.leftCMRField
63: && rightCMRField == pair.rightCMRField
64: && leftId.equals(pair.leftId)
65: && rightId.equals(pair.rightId)) {
66: return true;
67: }
68:
69: // check left==right and right==left
70: if (leftCMRField == pair.rightCMRField
71: && rightCMRField == pair.leftCMRField
72: && leftId.equals(pair.rightId)
73: && rightId.equals(pair.leftId)) {
74: return true;
75: }
76: }
77: return false;
78: }
79:
80: public int hashCode() {
81: return leftId.hashCode() ^ rightId.hashCode();
82: }
83: }
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