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


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 int[] to and from SQL. It converts the int[]
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 IntArrayConverter extends TypeAsBytesConverterBase {
23
24     public static class Factory extends TypeAsBytesConverterBase.Factory {
25
26         protected JdbcConverter createConverter(JdbcConverter nested) {
27             return new IntArrayConverter(nested);
28         }
29
30     }
31
32     public IntArrayConverter(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 / 4;
41         int[] a = new int[n];
42         int i = 0, j = 0;
43         for (; i < n; ) {
44             a[i++] = ((buf[j++] & 0xFF) << 24)
45                     + ((buf[j++] & 0xFF) << 16)
46                     + ((buf[j++] & 0xFF) << 8)
47                     + (buf[j++] & 0xFF);
48         }
49         return a;
50     }
51
52     /**
53      * Convert an instance of our value class into a byte[].
54      */
55     protected byte[] toByteArray(Object JavaDoc value) {
56         if (value == null) return null;
57         int[] a = (int[])value;
58         int n = a.length;
59         byte[] buf = new byte[n * 4];
60         int i = 0, j = 0;
61         for (; i < n; ) {
62             int x = a[i++];
63             buf[j++] = (byte)((x >>> 24) & 0xFF);
64             buf[j++] = (byte)((x >>> 16) & 0xFF);
65             buf[j++] = (byte)((x >>> 8) & 0xFF);
66             buf[j++] = (byte)(x & 0xFF);
67         }
68         return buf;
69     }
70
71     /**
72      * Get the type of our expected value objects (e.g. java.util.Locale
73      * for a converter for Locale's).
74      */
75     public Class JavaDoc getValueType() {
76         return int[].class;
77     }
78
79 }
80
81
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