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


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
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7  * of the software. All rights reserved.
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24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
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52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
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56 package org.objectstyle.cayenne.exp.parser;
57
58 import org.objectstyle.cayenne.exp.Expression;
59
60 /**
61  * "In" expression.
62  *
63  * @author Andrei Adamchik
64  */
65 public class ASTIn extends ConditionNode {
66
67     /**
68      * Constructor used by expression parser. Do not invoke directly.
69      */
70     ASTIn(int id) {
71         super(id);
72     }
73
74     public ASTIn() {
75         super(ExpressionParserTreeConstants.JJTIN);
76     }
77
78     public ASTIn(ASTPath path, ASTList list) {
79         super(ExpressionParserTreeConstants.JJTIN);
80         jjtAddChild(path, 0);
81         jjtAddChild(list, 1);
82     }
83
84     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
85         int len = jjtGetNumChildren();
86         if (len != 2) {
87             return Boolean.FALSE;
88         }
89
90         Object JavaDoc o1 = evaluateChild(0, o);
91         if (o1 == null) {
92             return Boolean.FALSE;
93         }
94
95         Object JavaDoc[] objects = (Object JavaDoc[]) evaluateChild(1, o);
96         if (objects == null) {
97             return Boolean.FALSE;
98         }
99
100         int size = objects.length;
101         for (int i = 0; i < size; i++) {
102             if (o1.equals(objects[i])) {
103                 return Boolean.TRUE;
104             }
105         }
106
107         return Boolean.FALSE;
108     }
109
110     /**
111      * Creates a copy of this expression node, without copying children.
112      */
113     public Expression shallowCopy() {
114         return new ASTIn(id);
115     }
116
117     protected String JavaDoc getExpressionOperator(int index) {
118         return "in";
119     }
120
121     public int getType() {
122         return Expression.IN;
123     }
124 }
125
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