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annotate src/org/tmatesoft/hg/util/ProgressSupport.java @ 682:f568330dd9c0

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Compile with Java5, ensure generics are fine for other compilers, too
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 22 Jul 2013 22:47:06 +0200
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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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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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91 }
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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 }