Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/FNCachePathHelper.java @ 694:7efabe0cddcf

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Speed up (a) file rename history to minimize file reads; (b) file.isCopy(int) to read metadata for few revisions at once (use pattern assumes earlier revisions are likely to be queried, too); (c) HgIgnore.isIgnored by caching matched initial fragments (to substitute more expensive Matcher.matches with cheaper HashMap.contains)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 05 Aug 2013 17:42:10 +0200
parents 5e0313485eef
children
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 static org.tmatesoft.hg.internal.StoragePathHelper.STR_DATA;
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20
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21 import org.tmatesoft.hg.util.PathRewrite;
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22
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23 /**
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24 * Prepare filelog names to be written into fncache.
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25 *
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26 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat#The_fncache_file
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27 * @author Artem Tikhomirov
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28 * @author TMate Software Ltd.
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29 */
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30 final class FNCachePathHelper implements PathRewrite {
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31
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32 private final EncodeDirPathHelper dirPathRewrite;
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33
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34
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35 public FNCachePathHelper() {
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36 dirPathRewrite = new EncodeDirPathHelper();
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37 }
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38
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39 /**
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40 * Input: repository-relative path of a filelog, i.e. without 'data/' or 'dh/' prefix, and/or '.i'/'.d' suffix.
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41 * Output: path ready to be written into fncache file, alaways with '.i' suffix (caller is free to alter the suffix to '.d' as appropriate
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42 */
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43 public CharSequence rewrite(CharSequence path) {
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44 CharSequence p = dirPathRewrite.rewrite(path);
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45 StringBuilder result = new StringBuilder(p.length() + STR_DATA.length() + ".i".length());
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46 result.append(STR_DATA);
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47 result.append(p);
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48 result.append(".i");
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49 return result;
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50 }
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51
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52 /*
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53 * There's always 'data/' prefix, even if actual file resides under 'dh/':
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54 *
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55 * $ cat .hg/store/fncache
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56 * data/very-long-directory-name-level-1/very-long-directory-name-level-2/very-long-directory-name-level-3/file-with-longest-name-i-am-not-lazy-to-type.txt.i
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57 * $ ls .hg/store/dh/very-lon/very-lon/very-lon/
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58 * file-with-longest-name-i-am-not-lazy-to-type.txtbbd4d3327f6364027211b0cd8ca499d3d6308849.i
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59 */
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60 }