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


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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  * "Like" expression.
63  *
64  * @author Andrei Adamchik
65  */
66 public class ASTLike extends PatternMatchNode {
67     ASTLike(int id) {
68         super(id, false);
69     }
70
71     public ASTLike() {
72         super(ExpressionParserTreeConstants.JJTLIKE, false);
73     }
74
75     public ASTLike(ASTPath path, Object JavaDoc pattern) {
76         super(ExpressionParserTreeConstants.JJTLIKE, false);
77         jjtAddChild(path, 0);
78         jjtAddChild(wrapChild(pattern), 1);
79     }
80
81     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
82         int len = jjtGetNumChildren();
83         if (len != 2) {
84             return Boolean.FALSE;
85         }
86
87         String JavaDoc s1 = ConversionUtil.toString(evaluateChild(0, o));
88         if (s1 == null) {
89             return Boolean.FALSE;
90         }
91
92         return matchPattern(s1) ? Boolean.TRUE : Boolean.FALSE;
93     }
94
95     /**
96      * Creates a copy of this expression node, without copying children.
97      */
98     public Expression shallowCopy() {
99         return new ASTLike(id);
100     }
101
102     protected String JavaDoc getExpressionOperator(int index) {
103         return "like";
104     }
105
106     public int getType() {
107         return Expression.LIKE;
108     }
109 }
110
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