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annotate src/org/tmatesoft/hg/internal/FileChangeMonitor.java @ 711:a62079bc422b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Keyword filtering that doesn't depend on input buffer size and the way input lines got split between filter() calls. KewordFilter got state to keep processed suspicious ...$ lines
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 11 Oct 2013 21:35:41 +0200
parents 5c68567b3645
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rev   line source
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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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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63 public interface Action {
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64 public void changed();
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65 }
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66 }