KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > objectstyle > cayenne > exp > parser > ASTLessOrEqual


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if any,
22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
32  *
33  * 5. Products derived from this software may not be called "ObjectStyle"
34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
35  * names without prior written permission.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */

56 package org.objectstyle.cayenne.exp.parser;
57
58 import org.objectstyle.cayenne.exp.Expression;
59 import org.objectstyle.cayenne.util.ConversionUtil;
60
61 /**
62  * "Less than or equal to" expression.
63  *
64  * @since 1.1
65  * @author Andrei Adamchik
66  */

67 public class ASTLessOrEqual extends ConditionNode {
68
69     /**
70      * Constructor used by expression parser. Do not invoke directly.
71      */

72     ASTLessOrEqual(int id) {
73         super(id);
74     }
75
76     public ASTLessOrEqual() {
77         super(ExpressionParserTreeConstants.JJTLESSOREQUAL);
78     }
79
80     public ASTLessOrEqual(ASTPath path, Object JavaDoc value) {
81         super(ExpressionParserTreeConstants.JJTLESSOREQUAL);
82         jjtAddChild(path, 0);
83         jjtAddChild(new ASTScalar(value), 1);
84     }
85
86     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
87         int len = jjtGetNumChildren();
88         if (len != 2) {
89             return Boolean.FALSE;
90         }
91
92         Comparable JavaDoc c1 = ConversionUtil.toComparable(evaluateChild(0, o));
93         if (c1 == null) {
94             return Boolean.FALSE;
95         }
96
97         Comparable JavaDoc c2 = ConversionUtil.toComparable(evaluateChild(1, o));
98         if (c2 == null) {
99             return Boolean.FALSE;
100         }
101
102         return c1.compareTo(c2) <= 0 ? Boolean.TRUE : Boolean.FALSE;
103     }
104
105     /**
106      * Creates a copy of this expression node, without copying children.
107      */

108     public Expression shallowCopy() {
109         return new ASTLessOrEqual(id);
110     }
111
112     protected String JavaDoc getExpressionOperator(int index) {
113         return "<=";
114     }
115
116     public int getType() {
117         return Expression.LESS_THAN_EQUAL_TO;
118     }
119 }
120
Popular Tags