1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm;
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3 |
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4 | import java.util.Collection;
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5 | import java.util.Collections;
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6 | import java.util.HashSet;
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7 | import java.util.Set;
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8 |
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9 | /**
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10 | * The default event implementation that is used to indicate a change in the {@link ChangesetCache}
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11 | */
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12 | public class DefaultChangesetCacheEvent implements ChangesetCacheEvent {
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13 |
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14 | private final Set<Changeset> added;
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15 | private final Set<Changeset> modified;
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16 | private final Set<Changeset> removed;
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17 | private final ChangesetCache source;
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18 |
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19 | /**
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20 | * Creates a basic, empty {@link ChangesetCacheEvent}
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21 | * @param source The source changeset
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22 | */
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23 | public DefaultChangesetCacheEvent(ChangesetCache source) {
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24 | this.source = source;
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25 | added = new HashSet<>();
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26 | modified = new HashSet<>();
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27 | removed = new HashSet<>();
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28 | }
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29 |
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30 | @Override
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31 | public ChangesetCache getSource() {
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32 | return source;
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33 | }
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34 |
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35 | @Override
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36 | public Collection<Changeset> getAddedChangesets() {
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37 | return Collections.unmodifiableCollection(added);
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38 | }
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39 |
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40 | @Override
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41 | public Collection<Changeset> getRemovedChangesets() {
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42 | return Collections.unmodifiableCollection(removed);
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43 | }
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44 |
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45 | @Override
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46 | public Collection<Changeset> getUpdatedChangesets() {
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47 | return Collections.unmodifiableCollection(modified);
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48 | }
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49 |
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50 | /**
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51 | * Adds a {@link Changeset} to the added list
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52 | * @param cs the {@link Changeset}
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53 | */
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54 | public void rememberAddedChangeset(Changeset cs) {
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55 | if (cs == null) return;
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56 | added.add(cs);
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57 | }
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58 |
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59 | /**
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60 | * Adds a {@link Changeset} to the updated list
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61 | * @param cs the {@link Changeset}
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62 | */
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63 | public void rememberUpdatedChangeset(Changeset cs) {
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64 | if (cs == null) return;
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65 | modified.add(cs);
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66 | }
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67 |
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68 | /**
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69 | * Adds a {@link Changeset} to the removed list
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70 | * @param cs the {@link Changeset}
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71 | */
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72 | public void rememberRemovedChangeset(Changeset cs) {
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73 | if (cs == null) return;
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74 | removed.add(cs);
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75 | }
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76 |
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77 | /**
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78 | * Checks if this event contains any {@link Changeset}s
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79 | * @return <code>true</code> if changesets were added
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80 | */
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81 | public boolean isEmpty() {
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82 | return added.isEmpty() && modified.isEmpty() && removed.isEmpty();
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83 | }
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84 | }
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