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annotate src/org/tmatesoft/hg/internal/LifecycleBridge.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 1ee452f31187
children
rev   line source
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1 /*
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2 * Copyright (c) 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.internal;
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19 import org.tmatesoft.hg.util.CancelSupport;
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20 import org.tmatesoft.hg.util.CancelledException;
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21 import org.tmatesoft.hg.util.ProgressSupport;
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23 /**
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24 * Bridge low-level life-cycle ({@link Lifecycle}) API with high-level one ({@link ProgressSupport} and {@link CancelSupport}).
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25 *
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26 * @author Artem Tikhomirov
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27 * @author TMate Software Ltd.
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28 */
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29 public class LifecycleBridge implements Lifecycle {
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30 private final ProgressSupport progressHelper;
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31 private final CancelSupport cancelSupport;
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32 // may be null unless #start() is invoked
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33 private Callback receiver;
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34 private CancelledException cancellation;
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35
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36
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37 public LifecycleBridge(ProgressSupport progress, CancelSupport cancel) {
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38 progressHelper = progress;
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39 cancelSupport = cancel;
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40 }
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41
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42 public void start(int count, Callback callback, Object token) {
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43 receiver = callback;
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44 if (progressHelper != null) {
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45 progressHelper.start(count);
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46 }
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47 }
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48
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49 public void finish(Object token) {
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50 if (progressHelper != null) {
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51 progressHelper.done();
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52 }
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53 receiver = null;
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54 }
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56 // XXX SHALL work without start/finish sequence because
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57 // HgLogCommand invokes ChangesetTransformer#next directly (i.e. not from
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58 // inside a library's #range() or similar) to process changesets in unnatural order.
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59 public void nextStep() {
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60 if (progressHelper != null) {
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61 progressHelper.worked(1);
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62 }
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63 if (cancelSupport == null) {
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64 return;
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65 }
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66 try {
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67 cancelSupport.checkCancelled();
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68 } catch (CancelledException ex) {
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69 if (receiver != null) {
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70 receiver.stop();
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71 }
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72 cancellation = ex;
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73 }
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74 }
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76 public void stop() {
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77 if (receiver != null) {
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78 receiver.stop();
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79 }
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80 }
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82 /**
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83 * @return <code>true</code> iff {@link CancelledException} was thrown and catched. Forced stop doesn't count
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84 */
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85 public boolean isCancelled() {
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86 return cancellation != null;
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87 }
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88
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89 public CancelledException getCancelOrigin() {
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90 return cancellation;
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91 }
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92 }