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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.geo.builders;
import com.spatial4j.core.shape.Shape;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Objects;
public class LineStringBuilder extends PointCollection<LineStringBuilder> {
public static final GeoShapeType TYPE = GeoShapeType.LINESTRING;
public static final LineStringBuilder PROTOTYPE = new LineStringBuilder();
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
builder.field(FIELD_TYPE, TYPE.shapeName());
builder.field(FIELD_COORDINATES);
coordinatesToXcontent(builder, false);
builder.endObject();
return builder;
}
/**
* Closes the current lineString by adding the starting point as the end point
*/
public LineStringBuilder close() {
Coordinate start = points.get(0);
Coordinate end = points.get(points.size()-1);
if(start.x != end.x || start.y != end.y) {
points.add(start);
}
return this;
}
@Override
public GeoShapeType type() {
return TYPE;
}
@Override
public Shape build() {
Coordinate[] coordinates = points.toArray(new Coordinate[points.size()]);
Geometry geometry;
if(wrapdateline) {
ArrayList<LineString> strings = decompose(FACTORY, coordinates, new ArrayList<LineString>());
if(strings.size() == 1) {
geometry = strings.get(0);
} else {
LineString[] linestrings = strings.toArray(new LineString[strings.size()]);
geometry = FACTORY.createMultiLineString(linestrings);
}
} else {
geometry = FACTORY.createLineString(coordinates);
}
return jtsGeometry(geometry);
}
static ArrayList<LineString> decompose(GeometryFactory factory, Coordinate[] coordinates, ArrayList<LineString> strings) {
for(Coordinate[] part : decompose(+DATELINE, coordinates)) {
for(Coordinate[] line : decompose(-DATELINE, part)) {
strings.add(factory.createLineString(line));
}
}
return strings;
}
/**
* Decompose a linestring given as array of coordinates at a vertical line.
*
* @param dateline x-axis intercept of the vertical line
* @param coordinates coordinates forming the linestring
* @return array of linestrings given as coordinate arrays
*/
private static Coordinate[][] decompose(double dateline, Coordinate[] coordinates) {
int offset = 0;
ArrayList<Coordinate[]> parts = new ArrayList<>();
double shift = coordinates[0].x > DATELINE ? DATELINE : (coordinates[0].x < -DATELINE ? -DATELINE : 0);
for (int i = 1; i < coordinates.length; i++) {
double t = intersection(coordinates[i-1], coordinates[i], dateline);
if(!Double.isNaN(t)) {
Coordinate[] part;
if(t<1) {
part = Arrays.copyOfRange(coordinates, offset, i+1);
part[part.length-1] = Edge.position(coordinates[i-1], coordinates[i], t);
coordinates[offset+i-1] = Edge.position(coordinates[i-1], coordinates[i], t);
shift(shift, part);
offset = i-1;
shift = coordinates[i].x > DATELINE ? DATELINE : (coordinates[i].x < -DATELINE ? -DATELINE : 0);
} else {
part = shift(shift, Arrays.copyOfRange(coordinates, offset, i+1));
offset = i;
}
parts.add(part);
}
}
if(offset == 0) {
parts.add(shift(shift, coordinates));
} else if(offset < coordinates.length-1) {
Coordinate[] part = Arrays.copyOfRange(coordinates, offset, coordinates.length);
parts.add(shift(shift, part));
}
return parts.toArray(new Coordinate[parts.size()][]);
}
private static Coordinate[] shift(double shift, Coordinate...coordinates) {
if(shift != 0) {
for (int j = 0; j < coordinates.length; j++) {
coordinates[j] = new Coordinate(coordinates[j].x - 2 * shift, coordinates[j].y);
}
}
return coordinates;
}
@Override
public int hashCode() {
return Objects.hash(points);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
LineStringBuilder other = (LineStringBuilder) obj;
return Objects.equals(points, other.points);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeVInt(points.size());
for (Coordinate point : points) {
writeCoordinateTo(point, out);
}
}
@Override
public LineStringBuilder readFrom(StreamInput in) throws IOException {
LineStringBuilder lineStringBuilder = new LineStringBuilder();
int size = in.readVInt();
for (int i=0; i < size; i++) {
lineStringBuilder.point(readCoordinateFrom(in));
}
return lineStringBuilder;
}
}
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