01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package com.db4o.nativequery.expr;
22:
23: public abstract class BinaryExpression implements Expression {
24:
25: protected Expression _left;
26: protected Expression _right;
27:
28: public BinaryExpression(Expression left, Expression right) {
29: this ._left = left;
30: this ._right = right;
31: }
32:
33: public Expression left() {
34: return _left;
35: }
36:
37: public Expression right() {
38: return _right;
39: }
40:
41: public boolean equals(Object other) {
42: if (this == other) {
43: return true;
44: }
45: if (other == null || getClass() != other.getClass()) {
46: return false;
47: }
48: BinaryExpression casted = (BinaryExpression) other;
49: return _left.equals(casted._left)
50: && (_right.equals(casted._right))
51: || _left.equals(casted._right)
52: && (_right.equals(casted._left));
53: }
54:
55: public int hashCode() {
56: return _left.hashCode() + _right.hashCode();
57: }
58: }
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