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/*
* Licensed to ElasticSearch and Shay Banon 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.index.fielddata.fieldcomparator;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.FieldComparator;
import org.elasticsearch.common.geo.GeoDistance;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.fielddata.GeoPointValues;
import org.elasticsearch.index.fielddata.IndexGeoPointFieldData;
import java.io.IOException;
/**
*/
public class GeoDistanceComparator extends NumberComparatorBase {
protected final IndexGeoPointFieldData indexFieldData;
protected final double lat;
protected final double lon;
protected final DistanceUnit unit;
protected final GeoDistance geoDistance;
protected final GeoDistance.FixedSourceDistance fixedSourceDistance;
protected final SortMode sortMode;
private final double[] values;
private double bottom;
private GeoDistanceValues geoDistanceValues;
public GeoDistanceComparator(int numHits, IndexGeoPointFieldData indexFieldData, double lat, double lon, DistanceUnit unit, GeoDistance geoDistance, SortMode sortMode) {
this.values = new double[numHits];
this.indexFieldData = indexFieldData;
this.lat = lat;
this.lon = lon;
this.unit = unit;
this.geoDistance = geoDistance;
this.fixedSourceDistance = geoDistance.fixedSourceDistance(lat, lon, unit);
this.sortMode = sortMode;
}
@Override
public FieldComparator setNextReader(AtomicReaderContext context) throws IOException {
GeoPointValues readerValues = indexFieldData.load(context).getGeoPointValues();
if (readerValues.isMultiValued()) {
geoDistanceValues = new MV(readerValues, fixedSourceDistance, sortMode);
} else {
geoDistanceValues = new SV(readerValues, fixedSourceDistance);
}
return this;
}
@Override
public int compare(int slot1, int slot2) {
final double v1 = values[slot1];
final double v2 = values[slot2];
if (v1 > v2) {
return 1;
} else if (v1 < v2) {
return -1;
} else {
return 0;
}
}
@Override
public int compareBottom(int doc) {
final double v2 = geoDistanceValues.computeDistance(doc);
if (bottom > v2) {
return 1;
} else if (bottom < v2) {
return -1;
} else {
return 0;
}
}
@Override
public int compareDocToValue(int doc, Double distance2) throws IOException {
double distance1 = geoDistanceValues.computeDistance(doc);
if (distance1 < distance2) {
return -1;
} else if (distance1 == distance2) {
return 0;
} else {
return 1;
}
}
@Override
public void copy(int slot, int doc) {
values[slot] = geoDistanceValues.computeDistance(doc);
}
@Override
public void setBottom(final int bottom) {
this.bottom = values[bottom];
}
@Override
public Double value(int slot) {
return values[slot];
}
@Override
public void add(int slot, int doc) {
values[slot] += geoDistanceValues.computeDistance(doc);
}
@Override
public void divide(int slot, int divisor) {
values[slot] /= divisor;
}
@Override
public void missing(int slot) {
values[slot] = Double.MAX_VALUE;
}
@Override
public int compareBottomMissing() {
return Double.compare(bottom, Double.MAX_VALUE);
}
// Computes the distance based on geo points.
// Due to this abstractions the geo distance comparator doesn't need to deal with whether fields have one
// or multiple geo points per document.
private static abstract class GeoDistanceValues {
protected final GeoPointValues readerValues;
protected final GeoDistance.FixedSourceDistance fixedSourceDistance;
protected GeoDistanceValues(GeoPointValues readerValues, GeoDistance.FixedSourceDistance fixedSourceDistance) {
this.readerValues = readerValues;
this.fixedSourceDistance = fixedSourceDistance;
}
public abstract double computeDistance(int doc);
}
// Deals with one geo point per document
private static final class SV extends GeoDistanceValues {
SV(GeoPointValues readerValues, GeoDistance.FixedSourceDistance fixedSourceDistance) {
super(readerValues, fixedSourceDistance);
}
@Override
public double computeDistance(int doc) {
GeoPoint geoPoint = readerValues.getValue(doc);
if (geoPoint == null) {
// is this true? push this to the "end"
return Double.MAX_VALUE;
} else {
return fixedSourceDistance.calculate(geoPoint.lat(), geoPoint.lon());
}
}
}
// Deals with more than one geo point per document
private static final class MV extends GeoDistanceValues {
private final SortMode sortMode;
MV(GeoPointValues readerValues, GeoDistance.FixedSourceDistance fixedSourceDistance, SortMode sortMode) {
super(readerValues, fixedSourceDistance);
this.sortMode = sortMode;
}
@Override
public double computeDistance(int doc) {
GeoPointValues.Iter iter = readerValues.getIter(doc);
if (!iter.hasNext()) {
return Double.MAX_VALUE;
}
GeoPoint point = iter.next();
double distance = fixedSourceDistance.calculate(point.lat(), point.lon());
int counter = 1;
while (iter.hasNext()) {
point = iter.next();
double newDistance = fixedSourceDistance.calculate(point.lat(), point.lon());
switch (sortMode) {
case MIN:
if (distance > newDistance) {
distance = newDistance;
}
break;
case MAX:
if (distance < newDistance) {
distance = newDistance;
}
break;
case AVG:
distance += newDistance;
counter++;
break;
}
}
if (sortMode == SortMode.AVG && counter > 1) {
return distance / counter;
} else {
return distance;
}
}
}
}
