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


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56 package org.objectstyle.cayenne.exp.parser;
57
58 import org.objectstyle.cayenne.exp.Expression;
59 import org.objectstyle.cayenne.exp.ExpressionException;
60 import org.objectstyle.cayenne.exp.ExpressionParameter;
61
62 /**
63  * A named expression parameter.
64  *
65  * @since 1.1
66  * @author Andrei Adamchik
67  */
68 public class ASTNamedParameter extends ASTScalar {
69     ASTNamedParameter(int id) {
70         super(id);
71     }
72
73     public ASTNamedParameter() {
74         super(ExpressionParserTreeConstants.JJTNAMEDPARAMETER);
75     }
76
77     public ASTNamedParameter(Object JavaDoc value) {
78         super(ExpressionParserTreeConstants.JJTNAMEDPARAMETER);
79         setValue(value);
80     }
81
82     protected Object JavaDoc evaluateNode(Object JavaDoc o) throws Exception JavaDoc {
83         throw new ExpressionException(
84             "Uninitialized parameter: " + value + ", call 'expWithParameters' first.");
85     }
86
87     /**
88      * Creates a copy of this expression node, without copying children.
89      */
90     public Expression shallowCopy() {
91         ASTNamedParameter copy = new ASTNamedParameter(id);
92         copy.value = value;
93         return copy;
94     }
95
96     public void setValue(Object JavaDoc value) {
97         if (value == null) {
98             throw new ExpressionException("Null Parameter value");
99         }
100
101         String JavaDoc name = value.toString().trim();
102         if (name.length() == 0) {
103             throw new ExpressionException("Empty Parameter value");
104         }
105
106         super.setValue(new ExpressionParameter(name));
107     }
108 }
109
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