Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/FileChangeMonitor.java @ 686:f1f095e42555
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author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 25 Jul 2013 22:12:14 +0200 (2013-07-25) |
parents | 5c68567b3645 |
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rev | line source |
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610
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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 java.io.File; |
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20 |
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21 /** |
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22 * This shall become interface/abstract class accessible from SessionContext, |
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23 * with plugable implementations, e.g. Java7 (file monitoring facilities) based, |
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24 * or any other convenient means. It shall allow both "check at the moment asked" |
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25 * and "collect changes and dispatch on demand" implementation approaches, so that |
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26 * implementors may use best available technology |
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27 * |
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28 * @author Artem Tikhomirov |
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29 * @author TMate Software Ltd. |
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30 */ |
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31 public class FileChangeMonitor { |
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32 private final File file; |
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33 private long lastModified; |
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34 private long length; |
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35 |
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36 /** |
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37 * First round: support for 1-monitor-1-file only |
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38 * Next round: 1-monitor-N files |
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39 */ |
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40 public FileChangeMonitor(File f) { |
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41 file = f; |
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42 } |
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43 |
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44 // shall work for files that do not exist |
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45 public void touch(Object source) { |
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46 lastModified = file.lastModified(); |
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47 length = file.length(); |
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48 } |
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49 |
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50 public void check(Object source, Action onChange) { |
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51 if (changed(source)) { |
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52 onChange.changed(); |
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53 } |
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54 } |
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55 |
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56 public boolean changed(Object source) { |
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57 if (file.lastModified() != lastModified) { |
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58 return true; |
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59 } |
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60 return file.length() != length; |
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61 } |
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62 |
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63 public interface Action { |
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64 public void changed(); |
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65 } |
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66 } |