KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > hsqldb > types > Binary


1 /* Copyright (c) 2001-2005, The HSQL Development Group
2  * All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  *
7  * Redistributions of source code must retain the above copyright notice, this
8  * list of conditions and the following disclaimer.
9  *
10  * Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  *
14  * Neither the name of the HSQL Development Group nor the names of its
15  * contributors may be used to endorse or promote products derived from this
16  * software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
22  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30
31
32 package org.hsqldb.types;
33
34 import org.hsqldb.lib.ArrayUtil;
35 import org.hsqldb.lib.StringConverter;
36
37 /**
38  * Java representation of a BINARY field value. <p>
39  *
40  * A Binary object instance always wraps a non-null byte[] object; all
41  * NULL SQL field values are represented internally by HSQLDB as Java null.
42  *
43  * @author fredt@users
44  * @version 1.7.2
45  * @since 1.7.2
46  */
47 public class Binary {
48
49     private byte[] data;
50     int hash;
51
52     /**
53      * This constructor is used inside the engine when an already serialized
54      * byte[] is read from a file (.log, .script, .data or text table source).
55      * In this case clone is false.
56      *
57      * When a byte[] is submitted as a parameter of PreparedStatement then
58      * clone is true.
59      */
60     public Binary(byte[] data, boolean clone) {
61
62         if (clone) {
63             data = (byte[]) ArrayUtil.duplicateArray(data);
64         }
65
66         this.data = data;
67     }
68
69     public byte[] getBytes() {
70         return data;
71     }
72
73     public byte[] getClonedBytes() {
74         return (byte[]) data.clone();
75     }
76
77     public int getBytesLength() {
78         return data.length;
79     }
80
81     public boolean equals(Object JavaDoc other) {
82
83         if (other == this) {
84             return true;
85         }
86
87         if (!(other instanceof Binary)) {
88             return false;
89         }
90
91         if (data.length != ((Binary) other).data.length) {
92             return false;
93         }
94
95         return ArrayUtil.containsAt(data, 0, ((Binary) other).data);
96     }
97
98     public int hashCode() {
99
100         int h = 0;
101
102         if (hash == 0) {
103             for (int i = 0; i < data.length; i++) {
104                 h = 31 * h + data[i];
105             }
106
107             hash = h;
108         }
109
110         return hash;
111     }
112
113     public String JavaDoc toString() {
114         return StringConverter.byteToHex(data);
115     }
116 }
117
Popular Tags