[4886] | 1 | // License: GPL. For details, see LICENSE file.
|
---|
| 2 | package org.openstreetmap.josm.io;
|
---|
| 3 |
|
---|
[6756] | 4 | import java.io.StringWriter;
|
---|
| 5 | import java.util.HashMap;
|
---|
[6485] | 6 | import java.util.Iterator;
|
---|
[4886] | 7 | import java.util.Map;
|
---|
| 8 | import java.util.Map.Entry;
|
---|
[6484] | 9 |
|
---|
[6756] | 10 | import javax.json.Json;
|
---|
| 11 | import javax.json.JsonArrayBuilder;
|
---|
| 12 | import javax.json.JsonObjectBuilder;
|
---|
| 13 | import javax.json.JsonWriter;
|
---|
| 14 | import javax.json.stream.JsonGenerator;
|
---|
| 15 |
|
---|
[6485] | 16 | import org.openstreetmap.josm.data.Bounds;
|
---|
[4886] | 17 | import org.openstreetmap.josm.data.coor.LatLon;
|
---|
[6756] | 18 | import org.openstreetmap.josm.data.osm.DataSet;
|
---|
| 19 | import org.openstreetmap.josm.data.osm.INode;
|
---|
| 20 | import org.openstreetmap.josm.data.osm.IRelation;
|
---|
| 21 | import org.openstreetmap.josm.data.osm.IWay;
|
---|
[4886] | 22 | import org.openstreetmap.josm.data.osm.Node;
|
---|
| 23 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
|
---|
| 24 | import org.openstreetmap.josm.data.osm.Way;
|
---|
[6756] | 25 | import org.openstreetmap.josm.data.osm.visitor.PrimitiveVisitor;
|
---|
[4886] | 26 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
|
---|
| 27 |
|
---|
[6756] | 28 | /**
|
---|
| 29 | * Writes OSM data as a GeoJSON string, using JSR 353: Java API for JSON Processing (JSON-P).
|
---|
| 30 | */
|
---|
| 31 | public class GeoJSONWriter {
|
---|
[4886] | 32 |
|
---|
| 33 | private OsmDataLayer layer;
|
---|
[6246] | 34 | private static final boolean skipEmptyNodes = true;
|
---|
[4886] | 35 |
|
---|
[6756] | 36 | /**
|
---|
| 37 | * Constructs a new {@code GeoJSONWriter}.
|
---|
| 38 | * @param layer The OSM data layer to save
|
---|
| 39 | */
|
---|
[4886] | 40 | public GeoJSONWriter(OsmDataLayer layer) {
|
---|
| 41 | this.layer = layer;
|
---|
| 42 | }
|
---|
| 43 |
|
---|
[6756] | 44 | /**
|
---|
| 45 | * Writes OSM data as a GeoJSON string (prettified).
|
---|
| 46 | * @return The GeoJSON data
|
---|
| 47 | */
|
---|
[4886] | 48 | public String write() {
|
---|
[6756] | 49 | return write(true);
|
---|
[4886] | 50 | }
|
---|
| 51 |
|
---|
[6756] | 52 | /**
|
---|
| 53 | * Writes OSM data as a GeoJSON string (prettified or not).
|
---|
| 54 | * @param pretty {@code true} to have pretty output, {@code false} otherwise
|
---|
| 55 | * @return The GeoJSON data
|
---|
| 56 | * @since 6756
|
---|
| 57 | */
|
---|
| 58 | public String write(boolean pretty) {
|
---|
| 59 | StringWriter stringWriter = new StringWriter();
|
---|
| 60 | Map<String, Object> config = new HashMap<String, Object>(1);
|
---|
| 61 | config.put(JsonGenerator.PRETTY_PRINTING, pretty);
|
---|
| 62 | JsonWriter writer = Json.createWriterFactory(config).createWriter(stringWriter);
|
---|
| 63 | JsonObjectBuilder object = Json.createObjectBuilder()
|
---|
| 64 | .add("type", "FeatureCollection")
|
---|
| 65 | .add("generator", "JOSM");
|
---|
| 66 | appendLayerBounds(layer.data, object);
|
---|
| 67 | appendLayerFeatures(layer.data, object);
|
---|
| 68 | writer.writeObject(object.build());
|
---|
| 69 | String result = stringWriter.toString();
|
---|
| 70 | writer.close();
|
---|
| 71 | return result;
|
---|
[4886] | 72 | }
|
---|
[6806] | 73 |
|
---|
| 74 | private static class GeometryPrimitiveVisitor implements PrimitiveVisitor {
|
---|
| 75 |
|
---|
| 76 | private final JsonObjectBuilder geomObj;
|
---|
| 77 |
|
---|
| 78 | public GeometryPrimitiveVisitor(JsonObjectBuilder geomObj) {
|
---|
| 79 | this.geomObj = geomObj;
|
---|
| 80 | }
|
---|
[4886] | 81 |
|
---|
[6806] | 82 | @Override
|
---|
| 83 | public void visit(INode n) {
|
---|
| 84 | geomObj.add("type", "Point");
|
---|
| 85 | LatLon ll = n.getCoor();
|
---|
| 86 | if (ll != null) {
|
---|
| 87 | geomObj.add("coordinates", getCoorArray(n.getCoor()));
|
---|
| 88 | }
|
---|
| 89 | }
|
---|
| 90 |
|
---|
| 91 | @Override
|
---|
| 92 | public void visit(IWay w) {
|
---|
| 93 | geomObj.add("type", "LineString");
|
---|
| 94 | if (w instanceof Way) {
|
---|
| 95 | JsonArrayBuilder array = Json.createArrayBuilder();
|
---|
| 96 | for (Node n : ((Way)w).getNodes()) {
|
---|
| 97 | LatLon ll = n.getCoor();
|
---|
| 98 | if (ll != null) {
|
---|
| 99 | array.add(getCoorArray(ll));
|
---|
| 100 | }
|
---|
| 101 | }
|
---|
| 102 | geomObj.add("coordinates", array);
|
---|
| 103 | }
|
---|
| 104 | }
|
---|
| 105 |
|
---|
| 106 | @Override
|
---|
| 107 | public void visit(IRelation r) {
|
---|
| 108 | }
|
---|
| 109 |
|
---|
| 110 | private JsonArrayBuilder getCoorArray(LatLon c) {
|
---|
| 111 | return Json.createArrayBuilder().add(c.lon()).add(c.lat());
|
---|
| 112 | }
|
---|
| 113 | }
|
---|
| 114 |
|
---|
[6756] | 115 | protected static void appendPrimitive(OsmPrimitive p, JsonArrayBuilder array) {
|
---|
[4886] | 116 | if (p.isIncomplete()) {
|
---|
| 117 | return;
|
---|
| 118 | } else if (skipEmptyNodes && p instanceof Node && p.getKeys().isEmpty()) {
|
---|
| 119 | return;
|
---|
| 120 | }
|
---|
[6756] | 121 |
|
---|
| 122 | // Properties
|
---|
| 123 | final JsonObjectBuilder propObj = Json.createObjectBuilder();
|
---|
| 124 | for (Entry<String, String> t : p.getKeys().entrySet()) {
|
---|
| 125 | propObj.add(t.getKey(), t.getValue());
|
---|
[4886] | 126 | }
|
---|
| 127 |
|
---|
[6756] | 128 | // Geometry
|
---|
| 129 | final JsonObjectBuilder geomObj = Json.createObjectBuilder();
|
---|
[6806] | 130 | p.accept(new GeometryPrimitiveVisitor(geomObj));
|
---|
[6756] | 131 |
|
---|
| 132 | // Build primitive JSON object
|
---|
| 133 | array.add(Json.createObjectBuilder()
|
---|
| 134 | .add("type", "Feature")
|
---|
| 135 | .add("properties", propObj)
|
---|
| 136 | .add("geometry", geomObj));
|
---|
[4886] | 137 | }
|
---|
[6485] | 138 |
|
---|
[6756] | 139 | protected static void appendLayerBounds(DataSet ds, JsonObjectBuilder object) {
|
---|
| 140 | if (ds != null) {
|
---|
| 141 | Iterator<Bounds> it = ds.getDataSourceBounds().iterator();
|
---|
| 142 | if (it.hasNext()) {
|
---|
| 143 | Bounds b = new Bounds(it.next());
|
---|
| 144 | while (it.hasNext()) {
|
---|
| 145 | b.extend(it.next());
|
---|
| 146 | }
|
---|
| 147 | appendBounds(b, object);
|
---|
[6485] | 148 | }
|
---|
| 149 | }
|
---|
| 150 | }
|
---|
| 151 |
|
---|
[6756] | 152 | protected static void appendBounds(Bounds b, JsonObjectBuilder object) {
|
---|
[6485] | 153 | if (b != null) {
|
---|
[6756] | 154 | object.add("bbox", Json.createArrayBuilder()
|
---|
| 155 | .add(b.getMinLon()).add(b.getMinLat())
|
---|
| 156 | .add(b.getMaxLon()).add(b.getMaxLat()));
|
---|
[6485] | 157 | }
|
---|
| 158 | }
|
---|
[6756] | 159 |
|
---|
| 160 | protected static void appendLayerFeatures(DataSet ds, JsonObjectBuilder object) {
|
---|
| 161 | JsonArrayBuilder array = Json.createArrayBuilder();
|
---|
| 162 | if (ds != null) {
|
---|
| 163 | for (Node n : ds.getNodes()) {
|
---|
| 164 | appendPrimitive(n, array);
|
---|
| 165 | }
|
---|
| 166 | for (Way w : ds.getWays()) {
|
---|
| 167 | appendPrimitive(w, array);
|
---|
| 168 | }
|
---|
| 169 | }
|
---|
| 170 | object.add("features", array);
|
---|
| 171 | }
|
---|
[4886] | 172 | }
|
---|