01: /*
02: * $Id: BaseIndexFactory.java,v 1.6 2005/06/29 21:09:30 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2004-2005 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: package org.axiondb.engine.indexes;
41:
42: import org.axiondb.AxionException;
43: import org.axiondb.Column;
44: import org.axiondb.Index;
45: import org.axiondb.IndexFactory;
46: import org.axiondb.Table;
47: import org.axiondb.util.StringIdentifierGenerator;
48:
49: /**
50: * Abstract base class for {@link IndexFactory}to hold common methods.
51: *
52: * @version $Revision: 1.6 $ $Date: 2005/06/29 21:09:30 $
53: * @author Jonathan Giron
54: */
55: public abstract class BaseIndexFactory implements IndexFactory {
56:
57: protected BaseIndexFactory() {
58: }
59:
60: /**
61: * Creates a new system instance with an autogenerated index name that combines the
62: * table name, column name, and current UNIX time (expressed in hexadecimal).
63: *
64: * @see org.axiondb.IndexFactory.makeNewSystemInstance(org.axiondb.Table,
65: * org.axiondb.Column, boolean)
66: */
67: public synchronized Index makeNewSystemInstance(Table table,
68: Column col, boolean memorydb) throws AxionException {
69: boolean unique = table.isPrimaryKeyConstraintExists(col
70: .getName())
71: || table.isUniqueConstraintExists(col.getName());
72: return makeNewInstance(StringIdentifierGenerator.INSTANCE
73: .next16DigitIdentifier("SYS"), col, unique, memorydb);
74: }
75: }
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