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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.aggregations.bucket.geogrid;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.SortedNumericDocValues;
import org.elasticsearch.common.geo.GeoBoundingBox;
import org.elasticsearch.geometry.Rectangle;
import org.elasticsearch.geometry.utils.Geohash;
import org.elasticsearch.index.fielddata.MultiGeoPointValues;
import org.elasticsearch.index.fielddata.SortedBinaryDocValues;
import org.elasticsearch.index.fielddata.SortedNumericDoubleValues;
import org.elasticsearch.search.aggregations.support.ValuesSource;
/**
* Class to help convert {@link MultiGeoPointValues}
* to GeoHash bucketing.
*/
public class GeoHashCellIdSource extends ValuesSource.Numeric {
private final GeoPoint valuesSource;
private final int precision;
private final GeoBoundingBox geoBoundingBox;
public GeoHashCellIdSource(GeoPoint valuesSource, int precision, GeoBoundingBox geoBoundingBox) {
this.valuesSource = valuesSource;
this.precision = precision;
this.geoBoundingBox = geoBoundingBox;
}
public int precision() {
return precision;
}
@Override
public boolean isFloatingPoint() {
return false;
}
@Override
public SortedNumericDocValues longValues(LeafReaderContext ctx) {
return geoBoundingBox.isUnbounded()
? new UnboundedCellValues(valuesSource.geoPointValues(ctx), precision)
: new BoundedCellValues(valuesSource.geoPointValues(ctx), precision, geoBoundingBox);
}
@Override
public SortedNumericDoubleValues doubleValues(LeafReaderContext ctx) {
throw new UnsupportedOperationException();
}
@Override
public SortedBinaryDocValues bytesValues(LeafReaderContext ctx) {
throw new UnsupportedOperationException();
}
private static class UnboundedCellValues extends CellValues {
UnboundedCellValues(MultiGeoPointValues geoValues, int precision) {
super(geoValues, precision);
}
@Override
int advanceValue(org.elasticsearch.common.geo.GeoPoint target, int valuesIdx) {
values[valuesIdx] = Geohash.longEncode(target.getLon(), target.getLat(), precision);
return valuesIdx + 1;
}
}
private static class BoundedCellValues extends CellValues {
private final GeoBoundingBox bbox;
private final boolean crossesDateline;
BoundedCellValues(MultiGeoPointValues geoValues, int precision, GeoBoundingBox bbox) {
super(geoValues, precision);
this.bbox = bbox;
this.crossesDateline = bbox.right() < bbox.left();
}
@Override
int advanceValue(org.elasticsearch.common.geo.GeoPoint target, int valuesIdx) {
final String hash = Geohash.stringEncode(target.getLon(), target.getLat(), precision);
if (validHash(hash)) {
values[valuesIdx] = Geohash.longEncode(hash);
return valuesIdx + 1;
}
return valuesIdx;
}
private boolean validHash(String hash) {
final Rectangle rectangle = Geohash.toBoundingBox(hash);
// touching hashes are excluded
if (bbox.top() > rectangle.getMinY() && bbox.bottom() < rectangle.getMaxY()) {
if (crossesDateline) {
return bbox.left() < rectangle.getMaxX() || bbox.right() > rectangle.getMinX();
} else {
return bbox.left() < rectangle.getMaxX() && bbox.right() > rectangle.getMinX();
}
}
return false;
}
}
}