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


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56
57 package org.objectstyle.cayenne.exp.parser;
58
59 import org.objectstyle.cayenne.exp.Expression;
60 import org.objectstyle.cayenne.util.Util;
61
62 /**
63  * "Not equal to" expression.
64  *
65  * @author Andrei Adamchik
66  */
67 public class ASTNotEqual extends ConditionNode {
68     ASTNotEqual(int id) {
69         super(id);
70     }
71
72     public ASTNotEqual() {
73         super(ExpressionParserTreeConstants.JJTNOTEQUAL);
74     }
75
76     /**
77      * Creates "Not Equal To" expression.
78      */
79     public ASTNotEqual(ASTPath path, Object JavaDoc value) {
80         super(ExpressionParserTreeConstants.JJTNOTEQUAL);
81         jjtAddChild(path, 0);
82         jjtAddChild(new ASTScalar(value), 1);
83     }
84
85     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
86         int len = jjtGetNumChildren();
87         if (len != 2) {
88             return Boolean.FALSE;
89         }
90
91         Object JavaDoc o1 = evaluateChild(0, o);
92         Object JavaDoc o2 = evaluateChild(1, o);
93         return Util.nullSafeEquals(o1, o2) ? Boolean.FALSE : Boolean.TRUE;
94     }
95
96     /**
97      * Creates a copy of this expression node, without copying children.
98      */
99     public Expression shallowCopy() {
100         return new ASTNotEqual(id);
101     }
102
103     protected String JavaDoc getExpressionOperator(int index) {
104         return "!=";
105     }
106
107     public int getType() {
108         return Expression.NOT_EQUAL_TO;
109     }
110 }
111
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