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


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 java.sql.SQLException JavaDoc;
42
43 import com.quadcap.sql.types.Value;
44
45 import com.quadcap.util.Debug;
46
47 /**
48  * A virtual row with columns remapped from an underlying physical row
49  *
50  * @author Stan Bailes
51  */
52 public class MapRow extends Row {
53     int offset = 1;
54     int[] map;
55     Row r;
56
57     public MapRow() {}
58
59     /**
60      * Create a new MapRow with a zero-based map
61      */
62     public MapRow(int[] map) {
63     this.map = map;
64     }
65
66     public MapRow(int[] map, int origin) {
67         this.map = map;
68         this.offset = 1 - origin;
69     }
70     
71     public int size() { return map.length - (1 - offset); }
72
73     public void setRow(Row r) { this.r = r; }
74
75     public Value item(int i) throws SQLException JavaDoc {
76     return r.item(map[i-offset]);
77     }
78
79     public void set(int i, Value val) throws SQLException JavaDoc {
80     r.set(map[i-offset], val);
81     }
82     
83 }
84
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