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annotate src/org/tmatesoft/hg/internal/FileChangeMonitor.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 5c68567b3645
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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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63 public interface Action {
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64 public void changed();
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65 }
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66 }