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


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19
20 package org.apache.cayenne.exp.parser;
21
22 import org.apache.cayenne.exp.Expression;
23 import org.apache.cayenne.util.ConversionUtil;
24
25 /**
26  * "Like" expression.
27  *
28  * @author Andrus Adamchik
29  */
30 public class ASTLike extends PatternMatchNode {
31     ASTLike(int id) {
32         super(id, false);
33     }
34
35     public ASTLike() {
36         super(ExpressionParserTreeConstants.JJTLIKE, false);
37     }
38
39     public ASTLike(ASTPath path, Object JavaDoc pattern) {
40         super(ExpressionParserTreeConstants.JJTLIKE, false);
41         jjtAddChild(path, 0);
42         jjtAddChild(wrapChild(pattern), 1);
43     }
44
45     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
46         int len = jjtGetNumChildren();
47         if (len != 2) {
48             return Boolean.FALSE;
49         }
50
51         String JavaDoc s1 = ConversionUtil.toString(evaluateChild(0, o));
52         if (s1 == null) {
53             return Boolean.FALSE;
54         }
55
56         return matchPattern(s1) ? Boolean.TRUE : Boolean.FALSE;
57     }
58
59     /**
60      * Creates a copy of this expression node, without copying children.
61      */
62     public Expression shallowCopy() {
63         return new ASTLike(id);
64     }
65
66     protected String JavaDoc getExpressionOperator(int index) {
67         return "like";
68     }
69
70     public int getType() {
71         return Expression.LIKE;
72     }
73 }
74
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