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


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
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6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
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10  * modification, are permitted provided that the following conditions
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24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
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28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
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31  * "andrus at objectstyle dot 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/>.
55  */
56 package org.objectstyle.cayenne.exp.parser;
57
58 import java.io.PrintWriter JavaDoc;
59
60 import org.objectstyle.cayenne.exp.Expression;
61
62 /**
63  * A scalar value wrapper expression.
64  *
65  * @since 1.1
66  * @author Andrei Adamchik
67  */
68 public class ASTScalar extends SimpleNode {
69     protected Object JavaDoc value;
70
71     /**
72      * Constructor used by expression parser. Do not invoke directly.
73      */
74     ASTScalar(int id) {
75         super(id);
76     }
77
78     public ASTScalar() {
79         super(ExpressionParserTreeConstants.JJTSCALAR);
80     }
81
82     public ASTScalar(Object JavaDoc value) {
83         super(ExpressionParserTreeConstants.JJTSCALAR);
84         setValue(value);
85     }
86
87     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
88         return value;
89     }
90
91     /**
92      * Creates a copy of this expression node, without copying children.
93      */
94     public Expression shallowCopy() {
95         ASTScalar copy = new ASTScalar(id);
96         copy.value = value;
97         return copy;
98     }
99
100     public void encodeAsString(PrintWriter JavaDoc pw) {
101         SimpleNode.encodeScalarAsString(pw, value);
102     }
103
104     public void setValue(Object JavaDoc value) {
105         this.value = value;
106     }
107
108     public Object JavaDoc getValue() {
109         return value;
110     }
111
112     protected String JavaDoc getExpressionOperator(int index) {
113         throw new UnsupportedOperationException JavaDoc(
114             "No operator for '" + ExpressionParserTreeConstants.jjtNodeName[id] + "'");
115     }
116 }
117
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