01: /*
02: * $Id: StringBTreeIndex.java,v 1.6 2005/06/18 01:03:45 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2003-2005 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:
41: package org.axiondb.engine.indexes;
42:
43: import java.io.File;
44: import java.io.IOException;
45:
46: import org.axiondb.AxionException;
47: import org.axiondb.Column;
48: import org.axiondb.DataType;
49: import org.axiondb.IndexLoader;
50: import org.axiondb.engine.StringBTreeIndexLoader;
51: import org.axiondb.util.NullObject;
52: import org.axiondb.util.ObjectBTree;
53: import org.axiondb.util.StringBTree;
54:
55: /**
56: * @version $Revision: 1.6 $ $Date: 2005/06/18 01:03:45 $
57: * @author Rodney Waldhoff
58: */
59: public class StringBTreeIndex extends ObjectBTreeIndex {
60:
61: public StringBTreeIndex(String name, Column column, boolean unique)
62: throws AxionException {
63: this (name, column, unique, 1000);
64: }
65:
66: public StringBTreeIndex(String name, Column column, boolean unique,
67: int minimizationFactor) throws AxionException {
68: this (name, column, unique, minimizationFactor, null);
69: }
70:
71: public StringBTreeIndex(String name, Column column, boolean unique,
72: int minimizationFactor, File dataDirectory)
73: throws AxionException {
74: super (name, column, unique, dataDirectory);
75: _minimizationFactor = minimizationFactor;
76: }
77:
78: public IndexLoader getIndexLoader() {
79: return LOADER;
80: }
81:
82: public int getMinimizationFactor() {
83: return _minimizationFactor;
84: }
85:
86: protected ObjectBTree createTree(File dataDirectory, String name,
87: int minimizationFactor, DataType dataType)
88: throws IOException, ClassNotFoundException {
89: return new StringBTree(dataDirectory, name, minimizationFactor,
90: dataType);
91: }
92:
93: protected Object getNullKey() {
94: return NullObject.INSTANCE.toString();
95: }
96:
97: private static final IndexLoader LOADER = new StringBTreeIndexLoader();
98: }
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