1 /*
2 * dpkg - Debian Package library and the Debian Package Maven plugin
3 * (c) Copyright 2016 Gerrit Hohl
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
19 package net.sourceforge.javadpkg.io.impl;
20
21 import java.io.IOException;
22 import java.security.MessageDigest;
23
24 import net.sourceforge.javadpkg.io.DataConsumer;
25
26
27 /**
28 * <p>
29 * A {@link DataConsumer} which updates a {@link MessageDigest}.
30 * </p>
31 *
32 * @author Gerrit Hohl (gerrit-hohl@users.sourceforge.net)
33 * @version <b>1.0</b>, 27.04.2016 by Gerrit Hohl
34 */
35 public class DataDigestConsumer implements DataConsumer {
36
37
38 /** The digest. */
39 private MessageDigest digest;
40 /** The name of the consumer in the exception (if one is thrown). */
41 private String name;
42
43
44 /**
45 * <p>
46 * Creates a consumer.
47 * </p>
48 *
49 * @param digest
50 * The digest.
51 * @param name
52 * The name of the consumer in the exception (if one is thrown).
53 * @throws IllegalArgumentException
54 * If any of the parameters are <code>null</code>.
55 */
56 public DataDigestConsumer(MessageDigest digest, String name) {
57 super();
58
59 if (digest == null)
60 throw new IllegalArgumentException("Argument digest is null.");
61 if (name == null)
62 throw new IllegalArgumentException("Argument name is null.");
63
64 this.digest = digest;
65 this.name = name;
66 }
67
68
69 @Override
70 public String getName() {
71 return this.name;
72 }
73
74
75 @Override
76 public void consume(byte[] buffer, int length) throws IOException {
77 if (buffer == null)
78 throw new IllegalArgumentException("Argument buffer is null.");
79 if (length < 0)
80 throw new IllegalArgumentException("Argument length is negative: " + length);
81 if (length > buffer.length)
82 throw new IllegalArgumentException("Argument length is greater than the buffer length. Length: " + length
83 + "; buffer length: " + buffer.length);
84
85 this.digest.update(buffer, 0, length);
86 }
87
88 }