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Java > Open Source Codes > com > versant > core > jdbc > sql > conv > CharArrayConverter


1
2 /*
3  * Copyright (c) 1998 - 2005 Versant Corporation
4  * All rights reserved. This program and the accompanying materials
5  * are made available under the terms of the Eclipse Public License v1.0
6  * which accompanies this distribution, and is available at
7  * http://www.eclipse.org/legal/epl-v10.html
8  *
9  * Contributors:
10  * Versant Corporation - initial API and implementation
11  */
12 package com.versant.core.jdbc.sql.conv;
13
14 import com.versant.core.jdbc.JdbcConverter;
15
16 /**
17  * This converter converts char[] to and from SQL. It converts the char[]
18  * to and from a byte[] and delegates to a nested converter.
19  * TODO This could be done much faster with java.nio buffers.
20  * @keep-all
21  */
22 public class CharArrayConverter extends TypeAsBytesConverterBase {
23
24     public static class Factory extends TypeAsBytesConverterBase.Factory {
25
26         protected JdbcConverter createConverter(JdbcConverter nested) {
27             return new CharArrayConverter(nested);
28         }
29
30     }
31
32     public CharArrayConverter(JdbcConverter nested) {
33         super(nested);
34     }
35
36     /**
37      * Convert a byte[] into an instance of our value class.
38      */
39     protected Object JavaDoc fromByteArray(byte[] buf) {
40         int n = buf.length / 2;
41         char[] a = new char[n];
42         int i = 0, j = 0;
43         for (; i < n; ) {
44             a[i++] = (char)(((buf[j++] & 0xFF) << 8) + (buf[j++] & 0xFF));
45         }
46         return a;
47     }
48
49     /**
50      * Convert an instance of our value class into a byte[].
51      */
52     protected byte[] toByteArray(Object JavaDoc value) {
53         if (value == null) return null;
54         char[] a = (char[])value;
55         int n = a.length;
56         byte[] buf = new byte[n * 2];
57         int i = 0, j = 0;
58         for (; i < n; ) {
59             char x = a[i++];
60             buf[j++] = (byte)((x >>> 8) & 0xFF);
61             buf[j++] = (byte)(x & 0xFF);
62         }
63         return buf;
64     }
65
66     /**
67      * Get the type of our expected value objects (e.g. java.util.Locale
68      * for a converter for Locale's).
69      */
70     public Class JavaDoc getValueType() {
71         return char[].class;
72     }
73
74 }
75
76
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