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


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56 package org.objectstyle.cayenne.exp.parser;
57
58 import java.io.PrintWriter JavaDoc;
59
60 import org.objectstyle.cayenne.exp.Expression;
61 import org.objectstyle.cayenne.util.ConversionUtil;
62
63 /**
64  * "Not" expression.
65  *
66  * @since 1.1
67  * @author Andrei Adamchik
68  */
69 public class ASTNot extends AggregateConditionNode {
70
71     ASTNot(int id) {
72         super(id);
73     }
74
75     public ASTNot() {
76         super(ExpressionParserTreeConstants.JJTNOT);
77     }
78
79     public ASTNot(Node expression) {
80         super(ExpressionParserTreeConstants.JJTNOT);
81         jjtAddChild(expression, 0);
82     }
83
84     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
85         int len = jjtGetNumChildren();
86         if (len == 0) {
87             return Boolean.FALSE;
88         }
89
90         return ConversionUtil.toBoolean(evaluateChild(0, o))
91             ? Boolean.FALSE
92             : Boolean.TRUE;
93     }
94
95     /**
96      * Creates a copy of this expression node, without copying children.
97      */
98     public Expression shallowCopy() {
99         return new ASTNot(id);
100     }
101
102     public int getType() {
103         return Expression.NOT;
104     }
105
106     public void encodeAsString(PrintWriter JavaDoc pw) {
107         pw.print("not ");
108         super.encodeAsString(pw);
109     }
110
111     protected String JavaDoc getExpressionOperator(int index) {
112         throw new UnsupportedOperationException JavaDoc(
113             "No operator for '" + ExpressionParserTreeConstants.jjtNodeName[id] + "'");
114     }
115 }
116
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