1 /*
2 * $Header$
3 * $Revision: 1335 $
4 * $Date: 2008-11-30 06:20:38 -0800 (Sun, 30 Nov 2008) $
5 *
6 * ====================================================================
7 *
8 * Copyright 2000-2002 bob mcwhirter & James Strachan.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions are
13 * met:
14 *
15 * * Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 *
18 * * Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * * Neither the name of the Jaxen Project nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
29 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
30 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 *
38 * ====================================================================
39 * This software consists of voluntary contributions made by many
40 * individuals on behalf of the Jaxen Project and was originally
41 * created by bob mcwhirter <bob@werken.com> and
42 * James Strachan <jstrachan@apache.org>. For more information on the
43 * Jaxen Project, please see <http://www.jaxen.org/>.
44 *
45 * $Id: DefaultTruthExpr.java 1335 2008-11-30 14:20:38Z elharo $
46 */
47
48
49
50 package org.jaxen.expr;
51
52 import java.util.List;
53
54 abstract class DefaultTruthExpr extends DefaultBinaryExpr
55 {
56 DefaultTruthExpr(Expr lhs,
57 Expr rhs)
58 {
59 super( lhs,
60 rhs );
61 }
62
63 public String toString()
64 {
65 return "[(DefaultTruthExpr): " + getLHS() + ", " + getRHS() + "]";
66 }
67
68 protected boolean bothAreSets(Object lhs,
69 Object rhs)
70 {
71 return ( lhs instanceof List
72 &&
73 rhs instanceof List );
74 }
75
76 protected boolean eitherIsSet(Object lhs,
77 Object rhs)
78 {
79 return ( lhs instanceof List
80 ||
81 rhs instanceof List );
82 }
83
84 protected boolean isSet(Object obj)
85 {
86 return ( obj instanceof List );
87 }
88
89 protected boolean isBoolean(Object obj)
90 {
91 return ( obj instanceof Boolean );
92 }
93
94 protected boolean setIsEmpty( List set )
95 {
96 return (set == null || set.size() == 0);
97 }
98
99 protected boolean eitherIsBoolean(Object lhs,
100 Object rhs)
101 {
102 return ( lhs instanceof Boolean
103 ||
104 rhs instanceof Boolean );
105 }
106
107 protected boolean bothAreBoolean(Object lhs,
108 Object rhs)
109 {
110 return ( lhs instanceof Boolean
111 &&
112 rhs instanceof Boolean );
113 }
114
115 protected boolean eitherIsNumber(Object lhs,
116 Object rhs)
117 {
118 return ( lhs instanceof Number
119 ||
120 rhs instanceof Number );
121 }
122
123 }
124