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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;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.xcontent.ToXContentObject;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.geometry.Geometry;
import org.elasticsearch.geometry.Rectangle;
import org.elasticsearch.geometry.ShapeType;
import org.elasticsearch.geometry.utils.StandardValidator;
import org.elasticsearch.geometry.utils.WellKnownText;
import java.io.IOException;
import java.text.ParseException;
import java.util.Objects;
/**
* A class representing a Geo-Bounding-Box for use by Geo queries and aggregations
* that deal with extents/rectangles representing rectangular areas of interest.
*/
public class GeoBoundingBox implements ToXContentObject, Writeable {
private static final WellKnownText WKT_PARSER = new WellKnownText(true, new StandardValidator(true));
static final ParseField TOP_RIGHT_FIELD = new ParseField("top_right");
static final ParseField BOTTOM_LEFT_FIELD = new ParseField("bottom_left");
static final ParseField TOP_FIELD = new ParseField("top");
static final ParseField BOTTOM_FIELD = new ParseField("bottom");
static final ParseField LEFT_FIELD = new ParseField("left");
static final ParseField RIGHT_FIELD = new ParseField("right");
static final ParseField WKT_FIELD = new ParseField("wkt");
public static final ParseField BOUNDS_FIELD = new ParseField("bounds");
public static final ParseField LAT_FIELD = new ParseField("lat");
public static final ParseField LON_FIELD = new ParseField("lon");
public static final ParseField TOP_LEFT_FIELD = new ParseField("top_left");
public static final ParseField BOTTOM_RIGHT_FIELD = new ParseField("bottom_right");
private final GeoPoint topLeft;
private final GeoPoint bottomRight;
public GeoBoundingBox(GeoPoint topLeft, GeoPoint bottomRight) {
this.topLeft = topLeft;
this.bottomRight = bottomRight;
}
public GeoBoundingBox(StreamInput input) throws IOException {
this.topLeft = input.readGeoPoint();
this.bottomRight = input.readGeoPoint();
}
public boolean isUnbounded() {
return Double.isNaN(topLeft.lon()) || Double.isNaN(topLeft.lat())
|| Double.isNaN(bottomRight.lon()) || Double.isNaN(bottomRight.lat());
}
public GeoPoint topLeft() {
return topLeft;
}
public GeoPoint bottomRight() {
return bottomRight;
}
public double top() {
return topLeft.lat();
}
public double bottom() {
return bottomRight.lat();
}
public double left() {
return topLeft.lon();
}
public double right() {
return bottomRight.lon();
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(BOUNDS_FIELD.getPreferredName());
toXContentFragment(builder, true);
builder.endObject();
return builder;
}
public XContentBuilder toXContentFragment(XContentBuilder builder, boolean buildLatLonFields) throws IOException {
if (buildLatLonFields) {
builder.startObject(TOP_LEFT_FIELD.getPreferredName());
builder.field(LAT_FIELD.getPreferredName(), topLeft.lat());
builder.field(LON_FIELD.getPreferredName(), topLeft.lon());
builder.endObject();
} else {
builder.array(TOP_LEFT_FIELD.getPreferredName(), topLeft.lon(), topLeft.lat());
}
if (buildLatLonFields) {
builder.startObject(BOTTOM_RIGHT_FIELD.getPreferredName());
builder.field(LAT_FIELD.getPreferredName(), bottomRight.lat());
builder.field(LON_FIELD.getPreferredName(), bottomRight.lon());
builder.endObject();
} else {
builder.array(BOTTOM_RIGHT_FIELD.getPreferredName(), bottomRight.lon(), bottomRight.lat());
}
return builder;
}
/**
* If the bounding box crosses the date-line (left greater-than right) then the
* longitude of the point need only to be higher than the left or lower
* than the right. Otherwise, it must be both.
*
* @param lon the longitude of the point
* @param lat the latitude of the point
* @return whether the point (lon, lat) is in the specified bounding box
*/
public boolean pointInBounds(double lon, double lat) {
if (lat >= bottom() && lat <= top()) {
if (left() <= right()) {
return lon >= left() && lon <= right();
} else {
return lon >= left() || lon <= right();
}
}
return false;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeGeoPoint(topLeft);
out.writeGeoPoint(bottomRight);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
GeoBoundingBox that = (GeoBoundingBox) o;
return topLeft.equals(that.topLeft) &&
bottomRight.equals(that.bottomRight);
}
@Override
public int hashCode() {
return Objects.hash(topLeft, bottomRight);
}
@Override
public String toString() {
return "BBOX (" + topLeft.lon() + ", " + bottomRight.lon() + ", " + topLeft.lat() + ", " + bottomRight.lat() + ")";
}
/**
* Parses the bounding box and returns bottom, top, left, right coordinates
*/
public static GeoBoundingBox parseBoundingBox(XContentParser parser) throws IOException, ElasticsearchParseException {
XContentParser.Token token = parser.currentToken();
if (token != XContentParser.Token.START_OBJECT) {
throw new ElasticsearchParseException("failed to parse bounding box. Expected start object but found [{}]", token);
}
double top = Double.NaN;
double bottom = Double.NaN;
double left = Double.NaN;
double right = Double.NaN;
String currentFieldName;
GeoPoint sparse = new GeoPoint();
Rectangle envelope = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
token = parser.nextToken();
if (WKT_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
try {
Geometry geometry = WKT_PARSER.fromWKT(parser.text());
if (ShapeType.ENVELOPE.equals(geometry.type()) == false) {
throw new ElasticsearchParseException("failed to parse WKT bounding box. ["
+ geometry.type() + "] found. expected [" + ShapeType.ENVELOPE + "]");
}
envelope = (Rectangle) geometry;
} catch (ParseException|IllegalArgumentException e) {
throw new ElasticsearchParseException("failed to parse WKT bounding box", e);
}
} else if (TOP_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
top = parser.doubleValue();
} else if (BOTTOM_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
bottom = parser.doubleValue();
} else if (LEFT_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
left = parser.doubleValue();
} else if (RIGHT_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
right = parser.doubleValue();
} else {
if (TOP_LEFT_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
GeoUtils.parseGeoPoint(parser, sparse, false, GeoUtils.EffectivePoint.TOP_LEFT);
top = sparse.getLat();
left = sparse.getLon();
} else if (BOTTOM_RIGHT_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
GeoUtils.parseGeoPoint(parser, sparse, false, GeoUtils.EffectivePoint.BOTTOM_RIGHT);
bottom = sparse.getLat();
right = sparse.getLon();
} else if (TOP_RIGHT_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
GeoUtils.parseGeoPoint(parser, sparse, false, GeoUtils.EffectivePoint.TOP_RIGHT);
top = sparse.getLat();
right = sparse.getLon();
} else if (BOTTOM_LEFT_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
GeoUtils.parseGeoPoint(parser, sparse, false, GeoUtils.EffectivePoint.BOTTOM_LEFT);
bottom = sparse.getLat();
left = sparse.getLon();
} else {
throw new ElasticsearchParseException("failed to parse bounding box. unexpected field [{}]", currentFieldName);
}
}
} else {
throw new ElasticsearchParseException("failed to parse bounding box. field name expected but [{}] found", token);
}
}
if (envelope != null) {
if (Double.isNaN(top) == false || Double.isNaN(bottom) == false || Double.isNaN(left) == false ||
Double.isNaN(right) == false) {
throw new ElasticsearchParseException("failed to parse bounding box. Conflicting definition found "
+ "using well-known text and explicit corners.");
}
GeoPoint topLeft = new GeoPoint(envelope.getMaxLat(), envelope.getMinLon());
GeoPoint bottomRight = new GeoPoint(envelope.getMinLat(), envelope.getMaxLon());
return new GeoBoundingBox(topLeft, bottomRight);
}
GeoPoint topLeft = new GeoPoint(top, left);
GeoPoint bottomRight = new GeoPoint(bottom, right);
return new GeoBoundingBox(topLeft, bottomRight);
}
}