Emux
342
vtm-json/src/org/oscim/tiling/source/geojson/TileDecoder.java
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342
vtm-json/src/org/oscim/tiling/source/geojson/TileDecoder.java
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/*
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* Copyright 2014 Hannes Janetzek
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* Copyright 2017 devemux86
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*
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* This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
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*
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* This program is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.oscim.tiling.source.geojson;
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import com.fasterxml.jackson.core.JsonFactory;
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import com.fasterxml.jackson.core.JsonParser;
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import com.fasterxml.jackson.core.JsonToken;
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import org.oscim.core.GeometryBuffer.GeometryType;
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import org.oscim.core.MapElement;
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import org.oscim.core.Tag;
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import org.oscim.core.Tile;
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import org.oscim.tiling.ITileDataSink;
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import org.oscim.tiling.source.ITileDecoder;
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import org.oscim.utils.ArrayUtils;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.util.LinkedHashMap;
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import static com.fasterxml.jackson.core.JsonToken.END_ARRAY;
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import static com.fasterxml.jackson.core.JsonToken.END_OBJECT;
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import static com.fasterxml.jackson.core.JsonToken.FIELD_NAME;
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import static com.fasterxml.jackson.core.JsonToken.START_ARRAY;
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import static com.fasterxml.jackson.core.JsonToken.START_OBJECT;
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import static com.fasterxml.jackson.core.JsonToken.VALUE_NUMBER_FLOAT;
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import static com.fasterxml.jackson.core.JsonToken.VALUE_NUMBER_INT;
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import static com.fasterxml.jackson.core.JsonToken.VALUE_STRING;
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import static org.oscim.core.MercatorProjection.latitudeToY;
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import static org.oscim.core.MercatorProjection.longitudeToX;
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public class TileDecoder implements ITileDecoder {
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private final MapElement mMapElement;
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private final GeojsonTileSource mTileSource;
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private final LinkedHashMap<String, Object> mTagMap;
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private final JsonFactory mJsonFactory;
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private final static char[] FIELD_FEATURES = "features".toCharArray();
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private final static char[] FIELD_GEOMETRY = "geometry".toCharArray();
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private final static char[] FIELD_PROPERTIES = "properties".toCharArray();
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private final static char[] FIELD_COORDINATES = "coordinates".toCharArray();
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private final static char[] FIELD_TYPE = "type".toCharArray();
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private final static char[] LINETRING = "LineString".toCharArray();
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private final static char[] POLYGON = "Polygon".toCharArray();
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private final static char[] POINT = "Point".toCharArray();
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private final static char[] MULTI_LINESTRING = "MultiLineString".toCharArray();
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private final static char[] MULTI_POLYGON = "MultiPolygon".toCharArray();
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private final static char[] MULTI_POINT = "MultiPoint".toCharArray();
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private ITileDataSink mTileDataSink;
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private double mTileY, mTileX, mTileScale;
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public TileDecoder(GeojsonTileSource tileSource) {
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mTileSource = tileSource;
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mTagMap = new LinkedHashMap<>();
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mJsonFactory = new JsonFactory();
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mMapElement = new MapElement();
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mMapElement.layer = 5;
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}
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@Override
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public boolean decode(Tile tile, ITileDataSink sink, InputStream is) throws IOException {
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mTileDataSink = sink;
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mTileScale = 1 << tile.zoomLevel;
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mTileX = tile.tileX / mTileScale;
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mTileY = tile.tileY / mTileScale;
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mTileScale *= Tile.SIZE;
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JsonParser jp = mJsonFactory.createParser(new InputStreamReader(is));
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Tag layerTag = null;
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for (JsonToken t; (t = jp.nextToken()) != null; ) {
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if (t == FIELD_NAME) {
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if (!match(jp, FIELD_FEATURES) && !match(jp, FIELD_TYPE))
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layerTag = new Tag("layer", jp.getCurrentName());
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if (match(jp, FIELD_FEATURES)) {
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if (jp.nextToken() != START_ARRAY)
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continue;
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while ((t = jp.nextToken()) != null) {
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if (t == START_OBJECT)
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parseFeature(jp, layerTag);
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if (t == END_ARRAY)
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break;
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}
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}
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}
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}
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return true;
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}
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private void parseFeature(JsonParser jp, Tag layerTag) throws IOException {
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mMapElement.clear();
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mMapElement.tags.clear();
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if (layerTag != null)
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mMapElement.tags.add(layerTag);
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mTagMap.clear();
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for (JsonToken t; (t = jp.nextToken()) != null; ) {
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if (t == FIELD_NAME) {
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if (match(jp, FIELD_GEOMETRY)) {
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if (jp.nextToken() == START_OBJECT)
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parseGeometry(jp);
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}
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if (match(jp, FIELD_PROPERTIES)) {
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if (jp.nextToken() == START_OBJECT)
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parseProperties(jp);
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}
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continue;
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}
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if (t == END_OBJECT)
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break;
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}
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//add tag information
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mTileSource.decodeTags(mMapElement, mTagMap);
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if (mMapElement.tags.numTags == 0)
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return;
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mTileSource.postGeomHook(mMapElement);
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if (mMapElement.type == GeometryType.NONE)
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return;
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//process this element
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mTileDataSink.process(mMapElement);
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}
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private void parseProperties(JsonParser jp) throws IOException {
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for (JsonToken t; (t = jp.nextToken()) != null; ) {
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if (t == FIELD_NAME) {
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String text = jp.getCurrentName();
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t = jp.nextToken();
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if (t == VALUE_STRING) {
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mTagMap.put(text, jp.getText());
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} else if (t == VALUE_NUMBER_INT) {
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mTagMap.put(text, jp.getNumberValue());
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}
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continue;
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}
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if (t == END_OBJECT)
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break;
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}
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}
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private void parseGeometry(JsonParser jp) throws IOException {
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boolean multi = false;
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GeometryType type = GeometryType.NONE;
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for (JsonToken t; (t = jp.nextToken()) != null; ) {
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if (t == FIELD_NAME) {
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if (match(jp, FIELD_COORDINATES)) {
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if (jp.nextToken() != START_ARRAY)
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continue;
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if (multi) {
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parseMulti(jp, type);
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} else {
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if (type == GeometryType.POLY)
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parsePolygon(jp);
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if (type == GeometryType.LINE)
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parseLineString(jp);
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if (type == GeometryType.POINT)
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parseCoordinate(jp);
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}
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} else if (match(jp, FIELD_TYPE)) {
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multi = false;
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jp.nextToken();
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if (match(jp, LINETRING))
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type = GeometryType.LINE;
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else if (match(jp, POLYGON))
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type = GeometryType.POLY;
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else if (match(jp, POINT))
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type = GeometryType.POINT;
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else if (match(jp, MULTI_LINESTRING)) {
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type = GeometryType.LINE;
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multi = true;
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} else if (match(jp, MULTI_POLYGON)) {
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type = GeometryType.POLY;
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multi = true;
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} else if (match(jp, MULTI_POINT)) {
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type = GeometryType.POINT;
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multi = true;
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}
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if (type == GeometryType.POINT)
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mMapElement.startPoints();
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}
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continue;
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}
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if (t == END_OBJECT)
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break;
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}
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}
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private void parseMulti(JsonParser jp, GeometryType type) throws IOException {
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for (JsonToken t; (t = jp.nextToken()) != null; ) {
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if (t == END_ARRAY)
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break;
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if (t == START_ARRAY) {
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if (type == GeometryType.POLY)
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parsePolygon(jp);
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else if (type == GeometryType.LINE)
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parseLineString(jp);
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else if (type == GeometryType.POINT)
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parseCoordinate(jp);
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} else {
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//....
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}
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}
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}
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private void parsePolygon(JsonParser jp) throws IOException {
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int ring = 0;
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for (JsonToken t; (t = jp.nextToken()) != null; ) {
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if (t == START_ARRAY) {
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if (ring == 0)
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mMapElement.startPolygon();
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else
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mMapElement.startHole();
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ring++;
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parseCoordSequence(jp);
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removeLastPoint();
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continue;
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}
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if (t == END_ARRAY)
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break;
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}
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}
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private void removeLastPoint() {
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mMapElement.pointPos -= 2;
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mMapElement.index[mMapElement.indexPos] -= 2;
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}
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private void parseLineString(JsonParser jp) throws IOException {
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mMapElement.startLine();
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parseCoordSequence(jp);
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}
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private void parseCoordSequence(JsonParser jp) throws IOException {
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for (JsonToken t; (t = jp.nextToken()) != null; ) {
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if (t == START_ARRAY) {
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parseCoordinate(jp);
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continue;
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}
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if (t == END_ARRAY)
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break;
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}
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}
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private void parseCoordinate(JsonParser jp) throws IOException {
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int pos = 0;
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double x = 0, y = 0; //, z = 0;
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for (JsonToken t; (t = jp.nextToken()) != null; ) {
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if (t == VALUE_NUMBER_FLOAT || t == VALUE_NUMBER_INT) {
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// avoid String allocation (by getDouble...)
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char[] val = jp.getTextCharacters();
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int offset = jp.getTextOffset();
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int length = jp.getTextLength();
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double c = ArrayUtils.parseNumber(val, offset, offset + length);
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if (pos == 0)
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x = c;
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if (pos == 1)
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y = c;
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//if (pos == 2)
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//z = c;
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pos++;
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continue;
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}
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if (t == END_ARRAY)
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break;
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}
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mMapElement.addPoint((float) ((longitudeToX(x) - mTileX) * mTileScale),
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(float) ((latitudeToY(y) - mTileY) * mTileScale));
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}
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private static boolean match(JsonParser jp, char[] fieldName) throws IOException {
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||||
int length = jp.getTextLength();
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||||
if (length != fieldName.length)
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return false;
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||||
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||||
char[] val = jp.getTextCharacters();
|
||||
int offset = jp.getTextOffset();
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||||
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||||
for (int i = 0; i < length; i++) {
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||||
if (fieldName[i] != val[i + offset])
|
||||
return false;
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||||
}
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||||
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||||
return true;
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||||
}
|
||||
}
|
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Reference in New Issue
Block a user