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


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 long[] to and from SQL. It converts the long[]
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 LongArrayConverter extends TypeAsBytesConverterBase {
23
24     public static class Factory extends TypeAsBytesConverterBase.Factory {
25
26         protected JdbcConverter createConverter(JdbcConverter nested) {
27             return new LongArrayConverter(nested);
28         }
29
30     }
31
32     public LongArrayConverter(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 / 8;
41         long[] a = new long[n];
42         int i = 0, j = 0;
43         for (; i < n; ) {
44             a[i++] = ((long)(buf[j++] & 0xFF) << 56)
45                     + ((long)(buf[j++] & 0xFF) << 48)
46                     + ((long)(buf[j++] & 0xFF) << 40)
47                     + ((long)(buf[j++] & 0xFF) << 32)
48                     + ((long)(buf[j++] & 0xFF) << 24)
49                     + ((buf[j++] & 0xFF) << 16)
50                     + ((buf[j++] & 0xFF) << 8)
51                     + (buf[j++] & 0xFF);
52         }
53         return a;
54     }
55
56     /**
57      * Convert an instance of our value class into a byte[].
58      */
59     protected byte[] toByteArray(Object JavaDoc value) {
60         if (value == null) return null;
61         long[] a = (long[])value;
62         int n = a.length;
63         byte[] buf = new byte[n * 8];
64         int i = 0, j = 0;
65         for (; i < n; ) {
66             long x = a[i++];
67             buf[j++] = (byte)((x >>> 56) & 0xFF);
68             buf[j++] = (byte)((x >>> 48) & 0xFF);
69             buf[j++] = (byte)((x >>> 40) & 0xFF);
70             buf[j++] = (byte)((x >>> 32) & 0xFF);
71             buf[j++] = (byte)((x >>> 24) & 0xFF);
72             buf[j++] = (byte)((x >>> 16) & 0xFF);
73             buf[j++] = (byte)((x >>> 8) & 0xFF);
74             buf[j++] = (byte)(x & 0xFF);
75         }
76         return buf;
77     }
78
79     /**
80      * Get the type of our expected value objects (e.g. java.util.Locale
81      * for a converter for Locale's).
82      */
83     public Class JavaDoc getValueType() {
84         return long[].class;
85     }
86
87 }
88
89
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