Mercurial > jhg
view src/org/tmatesoft/hg/internal/RevlogChangeMonitor.java @ 686:f1f095e42555
Annotated file is not always changed in the latest changeset, need to find out last changest it was changed at (iow, diffed to with BlameHelper)
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 25 Jul 2013 22:12:14 +0200 (2013-07-25) |
parents | 99ad1e3a4e4d |
children |
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/* * Copyright (c) 2013 TMate Software Ltd * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * For information on how to redistribute this software under * the terms of a license other than GNU General Public License * contact TMate Software at support@hg4j.com */ package org.tmatesoft.hg.internal; import java.io.File; import java.util.WeakHashMap; /** * Detect changes to revlog files. Not a general file change monitoring as we utilize the fact revlogs are append-only (and even in case * of stripped-off tail revisions, with e.g. mq, detection approach is still valid). * * @author Artem Tikhomirov * @author TMate Software Ltd. */ public class RevlogChangeMonitor { private final WeakHashMap<File, Long> lastKnownSize; private final WeakHashMap<File, Long> lastKnownTime; private final File soleFile; private long soleFileSize = -1; private long soleFileTime = -1; // use single for multiple files. TODO [1.2] repository/session context shall provide // alternative (configurable) implementations, so that Java7 users may supply better one public RevlogChangeMonitor() { lastKnownSize = new WeakHashMap<File, Long>(); lastKnownTime= new WeakHashMap<File, Long>(); soleFile = null; } public RevlogChangeMonitor(File f) { assert f != null; lastKnownSize = lastKnownTime = null; soleFile = f; } public void touch(File f) { assert f != null; if (lastKnownSize == null) { assert f == soleFile; soleFileSize = f.length(); soleFileTime = f.lastModified(); } else { lastKnownSize.put(f, f.length()); lastKnownTime.put(f, f.lastModified()); } } public boolean hasChanged(File f) { assert f != null; if (lastKnownSize == null) { assert f == soleFile; return soleFileSize != f.length() || soleFileTime != f.lastModified(); } else { Long lastSize = lastKnownSize.get(f); Long lastTime = lastKnownTime.get(f); if (lastSize == null || lastTime == null) { return true; } return f.length() != lastSize || f.lastModified() != lastTime; } } }