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annotate src/org/tmatesoft/hg/util/ProgressSupport.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 48f993aa2f41
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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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18
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19 /**
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20 * Mix-in to report progress of a long-running operation
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21 *
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22 * @author Artem Tikhomirov
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23 * @author TMate Software Ltd.
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24 */
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25 public interface ProgressSupport {
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26
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27 // -1 for unspecified?
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28 public void start(int totalUnits);
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29 public void worked(int units); // fraction of totalUnits from #start(int)
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30 // XXX have to specify whether PS implementors may expect #done regardless of job completion (i.e. in case of cancellation)
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31 public void done();
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32
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33 static class Factory {
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34
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35 /**
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36 * @param target object that might be capable to report progress. Can be <code>null</code>
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37 * @return support object extracted from target or an empty, no-op implementation
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38 */
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39 public static ProgressSupport get(Object target) {
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40 ProgressSupport ps = Adaptable.Factory.getAdapter(target, ProgressSupport.class, null);
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41 if (ps != null) {
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42 return ps;
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43 }
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44 return new ProgressSupport() {
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45 public void start(int totalUnits) {
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46 }
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47 public void worked(int units) {
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48 }
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49 public void done() {
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50 }
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51 };
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52 }
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53 }
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55 class Sub implements ProgressSupport {
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56 private int perChildWorkUnitMultiplier; // to multiply child ps units
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57 private int perChildWorkUnitDivisor; // to scale down to parent ps units
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58 private int unitsConsumed; // parent ps units consumed so far
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59 private int fraction = 0; // leftovers of previous not completely consumed work units
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60 private final ProgressSupport ps;
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61 private final int psUnits; // total parent ps units
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63 public Sub(ProgressSupport parent, int parentUnits) {
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64 if (parent == null) {
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65 throw new IllegalArgumentException();
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66 }
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67 ps = parent;
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68 psUnits = parentUnits;
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69 }
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71 public void start(int totalUnits) {
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72 // perChildWorkUnit = (psUnits*100) / totalUnits;
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73 perChildWorkUnitDivisor = 10 * totalUnits;
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74 perChildWorkUnitMultiplier = psUnits * perChildWorkUnitDivisor / totalUnits;
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75
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76 }
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78 public void worked(int worked) {
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79 int x = fraction + worked * perChildWorkUnitMultiplier;
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80 int u = x / perChildWorkUnitDivisor;
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81 fraction = x % perChildWorkUnitDivisor;
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82 if (u > 0) {
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83 ps.worked(u);
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84 unitsConsumed += u;
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85 }
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86 }
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88 public void done() {
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89 ps.worked(psUnits - unitsConsumed);
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90 }
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91 }
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92
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93 interface Target<T> {
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94 T set(ProgressSupport ps);
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95 }
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96 }