annotate src/org/tmatesoft/hg/internal/Preview.java @ 491:4a670f76e7d1

Javadoc for HgRepository#getLocation()
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Oct 2012 21:07:27 +0200
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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
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6 * the Free Software Foundation; version 2 of the License.
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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
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11 * GNU General Public License for more details.
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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,
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24 * for example, to find out whether filter shall be applied at all.
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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.
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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)
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37 * of the buffer. Caller enforces this reseting buffer position between calls to previewers.
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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
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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 }