01: /*
02: * $Id: BindVariable.java,v 1.8 2005/12/20 18:32:40 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2002-2006 Axion Development Team. All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: *
10: * 1. Redistributions of source code must retain the above
11: * copyright notice, this list of conditions and the following
12: * disclaimer.
13: *
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in
16: * the documentation and/or other materials provided with the
17: * distribution.
18: *
19: * 3. The names "Tigris", "Axion", nor the names of its contributors may
20: * not be used to endorse or promote products derived from this
21: * software without specific prior written permission.
22: *
23: * 4. Products derived from this software may not be called "Axion", nor
24: * may "Tigris" or "Axion" appear in their names without specific prior
25: * written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
30: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38: * =======================================================================
39: */
40:
41: package org.axiondb;
42:
43: import org.axiondb.types.AnyType;
44:
45: /**
46: * A {@link Literal}that can be bound via {@link java.sql.PreparedStatement}methods.
47: *
48: * @version $Revision: 1.8 $ $Date: 2005/12/20 18:32:40 $
49: * @author Rodney Waldhoff
50: * @author Ahimanikya Satapathy
51: */
52: public class BindVariable extends Literal {
53:
54: public BindVariable() {
55: super (AnyType.INSTANCE);
56: }
57:
58: public void clearBoundValue() {
59: _bound = false;
60: _value = null;
61: }
62:
63: public boolean isBound() {
64: return _bound;
65: }
66:
67: public void setValue(Object value) {
68: _value = value;
69: _bound = true;
70: }
71:
72: public String toString() {
73: return _bound ? super .toString() : "unbound";
74: }
75:
76: public Object evaluate() throws AxionException {
77: if (!_bound) {
78: throw new AxionException("Not bound");
79: }
80: return _value;
81: }
82:
83: private boolean _bound = false;
84: }
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