1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.io;
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3 |
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4 | import java.util.Iterator;
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5 | import java.util.Map;
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6 | import java.util.Map.Entry;
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7 |
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8 | import org.json.JSONStringer;
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9 | import org.openstreetmap.josm.data.Bounds;
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10 | import org.openstreetmap.josm.data.coor.LatLon;
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11 | import org.openstreetmap.josm.data.osm.Changeset;
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12 | import org.openstreetmap.josm.data.osm.Node;
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13 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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14 | import org.openstreetmap.josm.data.osm.Relation;
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15 | import org.openstreetmap.josm.data.osm.Way;
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16 | import org.openstreetmap.josm.data.osm.visitor.Visitor;
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17 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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18 |
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19 | public class GeoJSONWriter implements Visitor {
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20 |
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21 | private OsmDataLayer layer;
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22 | private JSONStringer out;
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23 | private static final boolean skipEmptyNodes = true;
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24 |
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25 | public GeoJSONWriter(OsmDataLayer layer) {
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26 | this.layer = layer;
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27 | }
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28 |
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29 | public String write() {
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30 | out = new JSONStringer();
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31 | out.object().key("type").value("FeatureCollection");
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32 | out.key("generator").value("JOSM");
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33 | appendLayerBounds();
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34 | out.key("features").array();
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35 | for (Node n : layer.data.getNodes()) {
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36 | appendPrimitive(n);
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37 | }
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38 | for (Way w : layer.data.getWays()) {
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39 | appendPrimitive(w);
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40 | }
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41 | out.endArray().endObject();
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42 | return out.toString();
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43 | }
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44 |
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45 | @Override
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46 | public void visit(Node n) {
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47 | out.key("type").value("Point").key("coordinates");
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48 | appendCoord(n.getCoor());
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49 | }
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50 |
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51 | @Override
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52 | public void visit(Way w) {
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53 | out.key("type").value("LineString").key("coordinates").array();
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54 | for (Node n : w.getNodes()) {
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55 | appendCoord(n.getCoor());
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56 | }
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57 | out.endArray();
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58 | }
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59 |
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60 | @Override
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61 | public void visit(Relation e) {
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62 | }
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63 |
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64 | @Override
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65 | public void visit(Changeset cs) {
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66 | }
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67 |
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68 | protected void appendPrimitive(OsmPrimitive p) {
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69 | if (p.isIncomplete()) {
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70 | return;
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71 | } else if (skipEmptyNodes && p instanceof Node && p.getKeys().isEmpty()) {
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72 | return;
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73 | }
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74 | out.object().key("type").value("Feature");
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75 | Map<String, String> tags = p.getKeys();
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76 | out.key("properties").object();
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77 | for (Entry<String, String> t : tags.entrySet()) {
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78 | out.key(t.getKey()).value(t.getValue());
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79 | }
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80 | out.endObject();
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81 | // append primitive specific
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82 | out.key("geometry").object();
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83 | p.accept(this);
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84 | out.endObject();
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85 | out.endObject();
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86 | }
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87 |
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88 | protected void appendCoord(LatLon c) {
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89 | if (c != null) {
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90 | out.array().value(c.lon()).value(c.lat()).endArray();
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91 | }
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92 | }
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93 |
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94 | protected void appendLayerBounds() {
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95 | Iterator<Bounds> it = layer.data.getDataSourceBounds().iterator();
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96 | if (it.hasNext()) {
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97 | Bounds b = new Bounds(it.next());
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98 | while (it.hasNext()) {
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99 | b.extend(it.next());
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100 | }
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101 | appendBounds(b);
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102 | }
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103 | }
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104 |
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105 | protected void appendBounds(Bounds b) {
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106 | if (b != null) {
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107 | out.key("bbox").array()
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108 | .value(b.getMinLon()).value(b.getMinLat())
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109 | .value(b.getMaxLon()).value(b.getMaxLat()).endArray();
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110 | }
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111 | }
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112 | }
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