Mercurial > jhg
annotate src/org/tmatesoft/hg/util/ProgressSupport.java @ 332:72c6eda838a6
NPE in HgDirstate.known() when no dirstate file present
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 09 Nov 2011 04:33:44 +0100 (2011-11-09) |
parents | 41a778e3fd31 |
children | 91d75e1bac9f |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011 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); |
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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 if (target instanceof ProgressSupport) { |
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41 return (ProgressSupport) target; |
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42 } |
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43 if (target instanceof Adaptable) { |
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44 ProgressSupport ps = ((Adaptable) target).getAdapter(ProgressSupport.class); |
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45 if (ps != null) { |
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46 return ps; |
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47 } |
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48 } |
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49 return new ProgressSupport() { |
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50 public void start(int totalUnits) { |
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51 } |
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52 public void worked(int units) { |
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53 } |
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54 public void done() { |
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55 } |
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56 }; |
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57 } |
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58 } |
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59 |
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60 class Sub implements ProgressSupport { |
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61 private final ProgressSupport ps; |
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62 private int total; |
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63 private int units; |
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64 private int psUnits; |
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65 |
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66 public Sub(ProgressSupport parent, int parentUnits) { |
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67 if (parent == null) { |
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68 throw new IllegalArgumentException(); |
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69 } |
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70 ps = parent; |
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71 psUnits = parentUnits; |
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72 } |
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73 |
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74 public void start(int totalUnits) { |
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75 total = totalUnits; |
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76 } |
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77 |
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78 public void worked(int worked) { |
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79 // FIXME fine-grained subprogress report. now only report at about 50% |
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80 if (psUnits > 1 && units < total/2 && units+worked > total/2) { |
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81 ps.worked(psUnits/2); |
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82 psUnits -= psUnits/2; |
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83 } |
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84 units += worked; |
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85 } |
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86 |
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87 public void done() { |
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88 ps.worked(psUnits); |
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89 } |
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90 } |
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91 |
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92 interface Target<T> { |
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93 T set(ProgressSupport ps); |
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94 } |
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95 } |