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


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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
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