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annotate src/org/tmatesoft/hg/internal/LifecycleBridge.java @ 520:1ee452f31187

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Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 21 Dec 2012 21:20:26 +0100
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520
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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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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18
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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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22
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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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55
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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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75
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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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81
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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 }