Mercurial > hg4j

annotate src/org/tmatesoft/hg/util/FileInfo.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 7f27122011c3
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.util;
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19 import java.nio.channels.ReadableByteChannel;
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21 /**
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22 * Subset of File-related functionality to support other than {@link java.io.File}-based {@link FileIterator} implementations
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 public interface FileInfo {
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29 /**
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30 * @return true if the filesystem object described by this instance exists, is a regular file and can be read
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31 */
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32 boolean exists();
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34 /**
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35 * File last modification time, in seconds since Jan 1, 1970. E.g. <code> {@link java.io.File#lastModified()} / 1000 </code>
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36 * @return int value representing time, in seconds, when file was last modified.
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37 */
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38 int lastModified();
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40 /**
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41 * @return file size
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42 */
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43 long length();
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45 /**
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46 * Access file contents. Caller is responsible to close the channel.
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47 * @return file reader object, never <code>null</code>
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48 */
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49 ReadableByteChannel newInputChannel();
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51 /**
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52 * This method is invoked only if source FileIterator tells <code>true</code> for {@link FileIterator#supportsExecFlag()}
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53 * @return <code>true</code> if this object describes an executable file
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54 */
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55 boolean isExecutable();
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56
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57 /**
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58 * This method is be invoked only if source FileIterator tells <code>true</code> for {@link FileIterator#supportsLinkFlag()}.
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59 * @return <code>true</code> if this file object represents a symbolic link
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60 */
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61 boolean isSymlink();
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62 }