1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.datatransfer;
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3 |
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4 | import java.awt.datatransfer.DataFlavor;
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5 | import java.awt.datatransfer.Transferable;
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6 | import java.awt.datatransfer.UnsupportedFlavorException;
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7 | import java.io.IOException;
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8 | import java.util.ArrayList;
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9 | import java.util.Collections;
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10 | import java.util.List;
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11 |
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12 | import org.openstreetmap.josm.gui.layer.Layer;
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13 | import org.openstreetmap.josm.gui.layer.LayerManager;
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14 |
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15 | /**
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16 | * This class allows to transfer multiple layers in the current JOSM instance.
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17 | * @author Michael Zangl
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18 | * @since 10605
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19 | */
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20 | public class LayerTransferable implements Transferable {
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21 |
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22 | /**
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23 | * A wrapper for a collection of {@link Layer}.
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24 | */
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25 | public static class Data {
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26 | private final LayerManager manager;
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27 | private final List<Layer> layers;
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28 |
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29 | /**
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30 | * Create a new data object
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31 | * @param manager The layer manager the layers are from.
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32 | * @param layers The layers.
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33 | */
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34 | public Data(LayerManager manager, List<Layer> layers) {
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35 | super();
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36 | this.manager = manager;
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37 | this.layers = new ArrayList<>(layers);
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38 | }
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39 |
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40 | /**
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41 | * Gets the layer manager the layers belong to.
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42 | * @return The layer manager. It may be <code>null</code>
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43 | */
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44 | public LayerManager getManager() {
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45 | return manager;
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46 | }
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47 |
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48 | /**
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49 | * Gets the list of layers that were copied.
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50 | * @return The layers.
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51 | */
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52 | public List<Layer> getLayers() {
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53 | return Collections.unmodifiableList(layers);
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54 | }
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55 |
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56 | @Override
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57 | public String toString() {
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58 | return "Data [layers=" + layers + ']';
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59 | }
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60 | }
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61 |
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62 | /**
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63 | * Data flavor for {@link Layer}s which are wrapped in {@link Data}.
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64 | */
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65 | public static final DataFlavor LAYER_DATA = ClipboardUtils.newDataFlavor(Data.class, "Layers");
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66 |
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67 | private final Data data;
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68 |
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69 | /**
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70 | * Create a new data object
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71 | * @param manager The layer manager the layers are from.
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72 | * @param layers The layers.
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73 | */
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74 | public LayerTransferable(LayerManager manager, List<Layer> layers) {
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75 | this.data = new Data(manager, layers);
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76 | }
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77 |
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78 | @Override
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79 | public DataFlavor[] getTransferDataFlavors() {
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80 | return new DataFlavor[] {LAYER_DATA};
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81 | }
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82 |
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83 | @Override
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84 | public boolean isDataFlavorSupported(DataFlavor flavor) {
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85 | return LAYER_DATA.equals(flavor);
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86 | }
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87 |
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88 | @Override
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89 | public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
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90 | if (!isDataFlavorSupported(flavor)) {
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91 | throw new UnsupportedFlavorException(flavor);
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92 | } else {
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93 | return data;
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94 | }
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95 | }
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96 | }
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