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annotate src/org/tmatesoft/hg/internal/GeneratePatchInspector.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents 4ea0351ca878
children 7839ff0bfd78
rev   line source
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1 /*
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2 * Copyright (c) 2013 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 org.tmatesoft.hg.internal.DiffHelper.DeltaInspector;
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20 import org.tmatesoft.hg.internal.DiffHelper.LineSequence;
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21
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22 class GeneratePatchInspector extends DeltaInspector<LineSequence> {
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23 private final Patch deltaCollector;
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24
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25 GeneratePatchInspector(Patch p) {
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26 assert p != null;
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27 deltaCollector = p;
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28 }
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29
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30 public static Patch delta(byte[] prev, byte[] content) {
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31 Patch rv = new Patch();
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32 DiffHelper<LineSequence> pg = new DiffHelper<LineSequence>();
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33 pg.init(new LineSequence(prev).splitByNewlines(), new LineSequence(content).splitByNewlines());
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34 pg.findMatchingBlocks(new GeneratePatchInspector(rv));
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35 return rv;
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36 }
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37
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38 @Override
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39 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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40 int from = seq1.chunk(s1From).getOffset();
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41 int to = seq1.chunk(s1To).getOffset();
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42 byte[] data = seq2.data(s2From, s2To);
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43 deltaCollector.add(from, to, data);
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44 }
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45
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46 @Override
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47 protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
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48 int from = seq1.chunk(s1From).getOffset();
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49 int to = seq1.chunk(s1To).getOffset();
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50 deltaCollector.add(from, to, new byte[0]);
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51 }
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52
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53 @Override
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54 protected void added(int s1InsertPoint, int s2From, int s2To) {
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55 int insPoint = seq1.chunk(s1InsertPoint).getOffset();
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56 byte[] data = seq2.data(s2From, s2To);
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57 deltaCollector.add(insPoint, insPoint, data);
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58 }
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59 }