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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.vividsolutions.jts.geom.Coordinate;
import org.elasticsearch.common.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
/**
* The {@link PointCollection} is an abstract base implementation for all GeoShapes. It simply handles a set of points.
*/
public abstract class PointCollection<E extends PointCollection<E>> extends ShapeBuilder {
protected final ArrayList<Coordinate> points;
protected PointCollection() {
this(new ArrayList<Coordinate>());
}
protected PointCollection(ArrayList<Coordinate> points) {
this.points = points;
}
@SuppressWarnings("unchecked")
private E thisRef() {
return (E)this;
}
/**
* Add a new point to the collection
* @param longitude longitude of the coordinate
* @param latitude latitude of the coordinate
* @return this
*/
public E point(double longitude, double latitude) {
return this.point(coordinate(longitude, latitude));
}
/**
* Add a new point to the collection
* @param coordinate coordinate of the point
* @return this
*/
public E point(Coordinate coordinate) {
this.points.add(coordinate);
return thisRef();
}
/**
* Add a array of points to the collection
*
* @param coordinates array of {@link Coordinate}s to add
* @return this
*/
public E points(Coordinate...coordinates) {
return this.points(Arrays.asList(coordinates));
}
/**
* Add a collection of points to the collection
*
* @param coordinates array of {@link Coordinate}s to add
* @return this
*/
public E points(Collection<? extends Coordinate> coordinates) {
this.points.addAll(coordinates);
return thisRef();
}
/**
* Copy all points to a new Array
*
* @param closed if set to true the first point of the array is repeated as last element
* @return Array of coordinates
*/
protected Coordinate[] coordinates(boolean closed) {
Coordinate[] result = points.toArray(new Coordinate[points.size() + (closed?1:0)]);
if(closed) {
result[result.length-1] = result[0];
}
return result;
}
/**
* builds an array of coordinates to a {@link XContentBuilder}
*
* @param builder builder to use
* @param closed repeat the first point at the end of the array if it's not already defines as last element of the array
* @return the builder
*/
protected XContentBuilder coordinatesToXcontent(XContentBuilder builder, boolean closed) throws IOException {
builder.startArray();
for(Coordinate point : points) {
toXContent(builder, point);
}
if(closed) {
Coordinate start = points.get(0);
Coordinate end = points.get(points.size()-1);
if(start.x != end.x || start.y != end.y) {
toXContent(builder, points.get(0));
}
}
builder.endArray();
return builder;
}
}
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