Mercurial > jhg

comparison src/org/tmatesoft/hg/internal/Preview.java @ 355:f2c11fe7f3e9

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Dec 2011 12:57:21 +0100
parents
children
comparison
equal deleted inserted replaced
354:5f9073eabf06 355:f2c11fe7f3e9
1 /*
2 * Copyright (c) 2011 TMate Software Ltd
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * For information on how to redistribute this software under
14 * the terms of a license other than GNU General Public License
15 * contact TMate Software at support@hg4j.com
16 */
17 package org.tmatesoft.hg.internal;
18
19 import java.nio.ByteBuffer;
20 import java.nio.channels.ByteChannel;
21
22 /**
23 * Filters may need to look into data stream before actual processing takes place,
24 * for example, to find out whether filter shall be applied at all.
25 *
26 * {@link ByteChannel ByteChannels} that may use filters shall be checked for {@link Preview} adaptable before writing to them.
27 *
28 * E.g. newline filter handles streams with mixed newline endings according to configuration option
29 * (either process or ignore), hence, need to check complete stream first.
30 *
31 * @author Artem Tikhomirov
32 * @author TMate Software Ltd.
33 */
34 public interface Preview {
35 /**
36 * Supplied buffer may be shared between few Preview filter instances, hence implementers shall NOT consume (move position)
37 * of the buffer. Caller enforces this reseting buffer position between calls to previewers.
38 * <p>
39 * XXX if this approach turns out to impose a great burden on filter implementations, FilterByteChannel may be modified to keep
40 * record of how far each filter had read it's buffer.
41 */
42 void preview(ByteBuffer src);
43 }