01: /*
02: * Copyright (C) 1999-2004 <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</a>
03: *
04: * This library is free software; you can redistribute it and/or
05: * modify it under the terms of the GNU Lesser General Public
06: * License as published by the Free Software Foundation; either
07: * version 2 of the License, or (at your option) any later version.
08: *
09: * This library is distributed in the hope that it will be useful,
10: * but WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12: * Lesser General Public License for more details.
13: *
14: * You should have received a copy of the GNU Lesser General Public
15: * License along with this library; if not, write to the Free Software
16: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17: */
18:
19: package org.mandarax.lib;
20:
21: import org.mandarax.kernel.*;
22:
23: /**
24: * Abstract super class mandarax lib predicates and functions.
25: * Equals and hashCode are defined here: all instamnces of a class are considered equal,
26: * usually only one instance per class should exist. However, when deserializing
27: * functions/mandarax, multiple instances might exist and will be considered equal.
28: * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
29: * @version 3.4 <7 March 05>
30: * @since 1.9.1
31: */
32: public abstract class LibObject {
33: /**
34: * Get the hashcode for the respective object.
35: * @return an integer
36: */
37: public int hashCode() {
38: return getClass().hashCode();
39: }
40:
41: /**
42: * Compare objects.
43: * @param obj another object
44: * @return a boolean
45: */
46: public boolean equals(Object obj) {
47: return obj != null && getClass() == obj.getClass();
48: }
49:
50: /**
51: * Indicates whether a predicate is a predicate from the lib.
52: * @param p a predicate
53: * @return a boolean
54: */
55: public static boolean isLibPredicate(Predicate p) {
56: return p != null
57: && (p instanceof AbstractPredicate || p instanceof Cut);
58: }
59: }
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