1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.io;
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3 |
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4 | import java.util.ArrayList;
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5 | import java.util.List;
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6 |
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7 | import javax.swing.DefaultComboBoxModel;
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8 |
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9 | import org.openstreetmap.josm.data.osm.Changeset;
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10 | import org.openstreetmap.josm.data.osm.ChangesetCache;
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11 | import org.openstreetmap.josm.data.osm.ChangesetCacheEvent;
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12 | import org.openstreetmap.josm.data.osm.ChangesetCacheListener;
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13 |
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14 | /**
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15 | * A combobox model for the list of open changesets. The model is populated with the list
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16 | * of open changesets kept in the {@link ChangesetCache}.
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17 | *
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18 | */
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19 | public class OpenChangesetComboBoxModel extends DefaultComboBoxModel<Changeset> implements ChangesetCacheListener {
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20 | private List<Changeset> changesets;
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21 | private Changeset selectedChangeset = null;
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22 |
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23 | protected Changeset getChangesetById(long id) {
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24 | for (Changeset cs : changesets) {
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25 | if (cs.getId() == id) return cs;
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26 | }
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27 | return null;
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28 | }
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29 |
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30 | /**
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31 | * Constructs a new {@code OpenChangesetComboBoxModel}.
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32 | */
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33 | public OpenChangesetComboBoxModel() {
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34 | this.changesets = new ArrayList<>();
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35 | }
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36 |
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37 | /**
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38 | * Refreshes the content of the combobox model with the current list of open
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39 | * changesets from the {@link ChangesetCache}.
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40 | */
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41 | public void refresh() {
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42 | changesets.clear();
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43 | changesets.addAll(ChangesetCache.getInstance().getOpenChangesets());
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44 | fireContentsChanged(this, 0, getSize());
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45 | int idx = changesets.indexOf(selectedChangeset);
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46 | if (idx < 0) {
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47 | selectFirstChangeset();
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48 | } else {
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49 | setSelectedItem(changesets.get(idx));
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50 | }
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51 | }
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52 |
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53 | /**
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54 | * Selects the first changeset in the current list of open changesets
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55 | */
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56 | public void selectFirstChangeset() {
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57 | if (changesets == null || changesets.isEmpty()) {
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58 | setSelectedItem(null);
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59 | } else {
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60 | setSelectedItem(changesets.get(0));
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61 | }
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62 | }
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63 |
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64 | /* ------------------------------------------------------------------------------------ */
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65 | /* ChangesetCacheListener */
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66 | /* ------------------------------------------------------------------------------------ */
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67 | @Override
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68 | public void changesetCacheUpdated(ChangesetCacheEvent event) {
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69 | refresh();
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70 | }
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71 |
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72 | /* ------------------------------------------------------------------------------------ */
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73 | /* ComboBoxModel */
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74 | /* ------------------------------------------------------------------------------------ */
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75 | @Override
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76 | public Changeset getElementAt(int index) {
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77 | return changesets.get(index);
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78 | }
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79 |
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80 | @Override
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81 | public int getIndexOf(Object anObject) {
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82 | return changesets.indexOf(anObject);
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83 | }
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84 |
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85 | @Override
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86 | public int getSize() {
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87 | return changesets.size();
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88 | }
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89 |
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90 | @Override
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91 | public Object getSelectedItem() {
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92 | return selectedChangeset;
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93 | }
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94 |
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95 | @Override
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96 | public void setSelectedItem(Object anObject) {
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97 | if (anObject == null) {
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98 | this.selectedChangeset = null;
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99 | super.setSelectedItem(null);
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100 | return;
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101 | }
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102 | if (! (anObject instanceof Changeset)) return;
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103 | Changeset cs = (Changeset)anObject;
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104 | if (cs.getId() == 0 || ! cs.isOpen()) return;
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105 | Changeset candidate = getChangesetById(cs.getId());
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106 | if (candidate == null) return;
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107 | this.selectedChangeset = candidate;
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108 | super.setSelectedItem(selectedChangeset);
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109 | }
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110 | }
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