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Java > Open Source Codes > org > exolab > jms > selector > parser > SelectorAST


1 /**
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3  * ("Software"), with or without modification, are permitted provided
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16  * products derived from this Software without prior written
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18  * please contact info@exolab.org.
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21  * nor may "Exolab" appear in their names without prior written
22  * permission of Exoffice Technologies. Exolab is a registered
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28  * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
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41  * Copyright 2000-2001,2003 (C) Exoffice Technologies Inc. All Rights Reserved.
42  */
43
44 package org.exolab.jms.selector.parser;
45
46 import antlr.CommonAST;
47 import antlr.CommonToken;
48 import antlr.Token;
49 import org.exolab.jms.selector.Context;
50 import org.exolab.jms.selector.Type;
51
52
53 /**
54  * Selector AST node. This adds expression type and context information used
55  * by the tree parser to validate expressions.
56  *
57  * @version $Revision: 1.1 $ $Date: 2004/11/26 01:50:45 $
58  * @author <a HREF="mailto:tima@intalio.com">Tim Anderson</a>
59  * @see Context
60  * @see SelectorParser
61  * @see SelectorTreeParser
62  * @see Type
63  */
64 public class SelectorAST extends CommonAST {
65
66     /**
67      * The return type
68      */
69     private Type _type;
70
71     /**
72      * The context of the node
73      */
74     private Context _context;
75
76
77     /**
78      * Construct a new <code>SelectorAST</code>
79      */
80     public SelectorAST() {
81         _type = Type.UNDEFINED;
82     }
83
84     /**
85      * Initialise this with a token
86      *
87      * @param token the token
88      */
89     public void initialize(final Token token) {
90         super.initialize(token);
91         _context = new Context(((CommonToken) token).getLine(),
92             ((CommonToken) token).getColumn());
93     }
94
95     /**
96      * Sets the return type of the expression
97      *
98      * @param type the return type
99      */
100     public void setReturnType(final Type type) {
101         _type = type;
102     }
103
104     /**
105      * Returns the return type of the expression
106      *
107      * @return the return type of the expression
108      */
109     public Type getReturnType() {
110         return _type;
111     }
112
113     /**
114      * Returns the context of the expression
115      *
116      * @return the context of the expression
117      */
118     public Context getContext() {
119         return _context;
120     }
121
122 } //-- SelectorAST
123
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