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Java > Open Source Codes > com > quadcap > sql > ParameterExpression


1 package com.quadcap.sql;
2
3 /* Copyright 1999 - 2003 Quadcap Software. All rights reserved.
4  *
5  * This software is distributed under the Quadcap Free Software License.
6  * This software may be used or modified for any purpose, personal or
7  * commercial. Open Source redistributions are permitted. Commercial
8  * redistribution of larger works derived from, or works which bundle
9  * this software requires a "Commercial Redistribution License"; see
10  * http://www.quadcap.com/purchase.
11  *
12  * Redistributions qualify as "Open Source" under one of the following terms:
13  *
14  * Redistributions are made at no charge beyond the reasonable cost of
15  * materials and delivery.
16  *
17  * Redistributions are accompanied by a copy of the Source Code or by an
18  * irrevocable offer to provide a copy of the Source Code for up to three
19  * years at the cost of materials and delivery. Such redistributions
20  * must allow further use, modification, and redistribution of the Source
21  * Code under substantially the same terms as this license.
22  *
23  * Redistributions of source code must retain the copyright notices as they
24  * appear in each source code file, these license terms, and the
25  * disclaimer/limitation of liability set forth as paragraph 6 below.
26  *
27  * Redistributions in binary form must reproduce this Copyright Notice,
28  * these license terms, and the disclaimer/limitation of liability set
29  * forth as paragraph 6 below, in the documentation and/or other materials
30  * provided with the distribution.
31  *
32  * The Software is provided on an "AS IS" basis. No warranty is
33  * provided that the Software is free of defects, or fit for a
34  * particular purpose.
35  *
36  * Limitation of Liability. Quadcap Software shall not be liable
37  * for any damages suffered by the Licensee or any third party resulting
38  * from use of the Software.
39  */
40
41 import com.quadcap.sql.types.Value;
42 import com.quadcap.sql.types.Type;
43 import com.quadcap.sql.types.TypeAny;
44
45 import com.quadcap.util.Debug;
46
47 /**
48  * Expression implementing JDBC run-time parameters (e.g., "?")
49  *
50  * @author Stan Bailes
51  */
52 public class ParameterExpression extends Expression {
53     Value value;
54
55     public ParameterExpression() {
56     }
57
58     public int rank() { return 0; }
59
60     public Value getValue(Session session, Cursor cursor) {
61     return value;
62     }
63
64     public Type getType(Session session, Cursor cursor) {
65         return TypeAny.any;
66     }
67
68     public void setValue(Value value) {
69     this.value = value;
70     }
71
72     public void invert() {
73     throw new RuntimeException JavaDoc(
74         "invert not implemented for ParameterExpression");
75     }
76
77     public void visitSubExpressions(ExpressionVisitor ev) {
78     }
79
80     public String JavaDoc toString() {
81         return "?";
82     }
83 }
84
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