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annotate src/org/tmatesoft/hg/internal/Preview.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents f2c11fe7f3e9
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rev   line source
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f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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6 * the Free Software Foundation; version 2 of the License.
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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11 * GNU General Public License for more details.
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.nio.ByteBuffer;
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20 import java.nio.channels.ByteChannel;
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21
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22 /**
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23 * Filters may need to look into data stream before actual processing takes place,
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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24 * for example, to find out whether filter shall be applied at all.
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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25 *
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26 * {@link ByteChannel ByteChannels} that may use filters shall be checked for {@link Preview} adaptable before writing to them.
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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27 *
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28 * E.g. newline filter handles streams with mixed newline endings according to configuration option
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29 * (either process or ignore), hence, need to check complete stream first.
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public interface Preview {
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35 /**
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36 * Supplied buffer may be shared between few Preview filter instances, hence implementers shall NOT consume (move position)
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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37 * of the buffer. Caller enforces this reseting buffer position between calls to previewers.
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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38 * <p>
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39 * XXX if this approach turns out to impose a great burden on filter implementations, FilterByteChannel may be modified to keep
f2c11fe7f3e9 Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
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40 * record of how far each filter had read it's buffer.
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41 */
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42 void preview(ByteBuffer src);
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43 }