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Java > Open Source Codes > com > caucho > db > table > Row


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.db.table;
30
31 class Row {
32   // bit of the first null mask, i.e. skipping the allocation bits
33 private static final int NULL_OFFSET = 2;
34
35   private Column []_columns = new Column[0];
36   private int _rowLength = 1;
37   private int _nullOffset = 0;
38
39   /**
40    * Returns the current row length
41    */
42   int getLength()
43   {
44     return _rowLength;
45   }
46
47   /**
48    * Returns the current null offset.
49    */
50   int getNullOffset()
51   {
52     return _nullOffset;
53   }
54
55   /**
56    * Returns the current null mask.
57    */
58   byte getNullMask()
59   {
60     return (byte) (1 << ((_columns.length + NULL_OFFSET) % 8));
61   }
62
63   /**
64    * Returns the columns.
65    */
66   Column []getColumns()
67   {
68     return _columns;
69   }
70
71   /**
72    * Returns the named column.
73    */
74   Column getColumn(String JavaDoc name)
75   {
76     for (int i = 0; i < _columns.length; i++)
77       if (name.equals(_columns[i].getName()))
78         return _columns[i];
79
80     return null;
81   }
82
83   /**
84    * Allocates space for a column.
85    */
86   void allocateColumn()
87   {
88     if ((_columns.length + NULL_OFFSET) % 8 == 0) {
89       _nullOffset = _rowLength;
90       _rowLength++;
91     }
92   }
93
94   /**
95    * Adds a new column to the table.
96    */
97   Column addColumn(Column column)
98   {
99     Column []newColumns = new Column[_columns.length + 1];
100
101     System.arraycopy(_columns, 0, newColumns, 0, _columns.length);
102     _columns = newColumns;
103
104     _columns[_columns.length - 1] = column;
105
106     _rowLength += column.getLength();
107
108     return column;
109   }
110 }
111
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