Source Code Cross Referenced for RowComparator.java in  » Database-DBMS » axion » org » axiondb » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » axion » org.axiondb 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * $Id: RowComparator.java,v 1.14 2004/08/27 03:21:19 ahimanikya Exp $
03:         * =======================================================================
04:         * Copyright (c) 2002-2004 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 java.util.Comparator;
44:
45:        import org.axiondb.util.ExceptionConverter;
46:
47:        /**
48:         * A {@link Comparator}for {@link Row Rows}, which will sort a collection according to
49:         * the value of a single selectable. By using a ComparatorChain, one can perform in-memory
50:         * sorts over multiple columns.
51:         * 
52:         * @author Morgan Delagrange
53:         * @author Rodney Waldhoff
54:         * @author Ahimanikya Satapathy
55:         */
56:        public class RowComparator implements  Comparator {
57:            public RowComparator(Selectable sel, RowDecorator dec) {
58:                _sel = sel;
59:                _dec = dec;
60:                _cmp = _sel.getDataType();
61:            }
62:
63:            public int compare(Object o1, Object o2) {
64:                Object column1 = evaluate(o1);
65:                Object column2 = evaluate(o2);
66:                int eval = 0;
67:                if (null == column1) {
68:                    if (null == column2) {
69:                        eval = 0;
70:                    } else {
71:                        eval = 1;
72:                    }
73:                } else if (null == column2) {
74:                    eval = -1;
75:                } else {
76:                    eval = _cmp.compare(column1, column2);
77:                }
78:                return eval;
79:            }
80:
81:            private Object evaluate(Object obj) {
82:                try {
83:                    _dec.setRow(-1, (Row) obj);
84:                    return _sel.evaluate(_dec);
85:                } catch (ClassCastException castEx) {
86:                    throw new RuntimeException("Expected Row, found " + obj);
87:                } catch (Exception e) {
88:                    throw ExceptionConverter.convertToRuntimeException(e);
89:                }
90:            }
91:
92:            private Comparator _cmp = null;
93:            private RowDecorator _dec = null;
94:            private Selectable _sel = null;
95:        }
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