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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.search.aggregations.bucket.geogrid;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.SortedNumericDocValues;
import org.apache.lucene.util.GeoHashUtils;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.fielddata.MultiGeoPointValues;
import org.elasticsearch.index.fielddata.SortedBinaryDocValues;
import org.elasticsearch.index.fielddata.SortedNumericDoubleValues;
import org.elasticsearch.index.fielddata.SortingNumericDocValues;
import org.elasticsearch.index.query.GeoBoundingBoxQueryBuilder;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.NonCollectingAggregator;
import org.elasticsearch.search.aggregations.bucket.BucketUtils;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.ValuesSourceParser;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* Aggregates Geo information into cells determined by geohashes of a given precision.
* WARNING - for high-precision geohashes it may prove necessary to use a {@link GeoBoundingBoxQueryBuilder}
* aggregation to focus in on a smaller area to avoid generating too many buckets and using too much RAM
*/
public class GeoHashGridParser implements Aggregator.Parser {
@Override
public String type() {
return InternalGeoHashGrid.TYPE.name();
}
@Override
public AggregatorFactory parse(String aggregationName, XContentParser parser, SearchContext context) throws IOException {
ValuesSourceParser vsParser = ValuesSourceParser.geoPoint(aggregationName, InternalGeoHashGrid.TYPE, context).build();
int precision = GeoHashGridParams.DEFAULT_PRECISION;
int requiredSize = GeoHashGridParams.DEFAULT_MAX_NUM_CELLS;
int shardSize = -1;
XContentParser.Token token;
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (vsParser.token(currentFieldName, token, parser)) {
continue;
} else if (token == XContentParser.Token.VALUE_NUMBER ||
token == XContentParser.Token.VALUE_STRING) { //Be lenient and also allow numbers enclosed in quotes
if (context.parseFieldMatcher().match(currentFieldName, GeoHashGridParams.FIELD_PRECISION)) {
precision = GeoHashGridParams.checkPrecision(parser.intValue());
} else if (context.parseFieldMatcher().match(currentFieldName, GeoHashGridParams.FIELD_SIZE)) {
requiredSize = parser.intValue();
} else if (context.parseFieldMatcher().match(currentFieldName, GeoHashGridParams.FIELD_SHARD_SIZE)) {
shardSize = parser.intValue();
}
} else if (token != XContentParser.Token.START_OBJECT) {
throw new SearchParseException(context, "Unexpected token " + token + " in [" + aggregationName + "].",
parser.getTokenLocation());
}
}
if (shardSize == 0) {
shardSize = Integer.MAX_VALUE;
}
if (requiredSize == 0) {
requiredSize = Integer.MAX_VALUE;
}
if (shardSize < 0) {
//Use default heuristic to avoid any wrong-ranking caused by distributed counting
shardSize = BucketUtils.suggestShardSideQueueSize(requiredSize, context.numberOfShards());
}
if (shardSize < requiredSize) {
shardSize = requiredSize;
}
return new GeoGridFactory(aggregationName, vsParser.config(), precision, requiredSize, shardSize);
}
static class GeoGridFactory extends ValuesSourceAggregatorFactory<ValuesSource.GeoPoint> {
private final int precision;
private final int requiredSize;
private final int shardSize;
public GeoGridFactory(String name, ValuesSourceConfig<ValuesSource.GeoPoint> config, int precision, int requiredSize, int shardSize) {
super(name, InternalGeoHashGrid.TYPE.name(), config);
this.precision = precision;
this.requiredSize = requiredSize;
this.shardSize = shardSize;
}
@Override
protected Aggregator createUnmapped(AggregationContext aggregationContext, Aggregator parent, List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) throws IOException {
final InternalAggregation aggregation = new InternalGeoHashGrid(name, requiredSize,
Collections.<InternalGeoHashGrid.Bucket> emptyList(), pipelineAggregators, metaData);
return new NonCollectingAggregator(name, aggregationContext, parent, pipelineAggregators, metaData) {
public InternalAggregation buildEmptyAggregation() {
return aggregation;
}
};
}
@Override
protected Aggregator doCreateInternal(final ValuesSource.GeoPoint valuesSource, AggregationContext aggregationContext,
Aggregator parent, boolean collectsFromSingleBucket, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
throws IOException {
if (collectsFromSingleBucket == false) {
return asMultiBucketAggregator(this, aggregationContext, parent);
}
CellIdSource cellIdSource = new CellIdSource(valuesSource, precision);
return new GeoHashGridAggregator(name, factories, cellIdSource, requiredSize, shardSize, aggregationContext, parent, pipelineAggregators,
metaData);
}
private static class CellValues extends SortingNumericDocValues {
private MultiGeoPointValues geoValues;
private int precision;
protected CellValues(MultiGeoPointValues geoValues, int precision) {
this.geoValues = geoValues;
this.precision = precision;
}
@Override
public void setDocument(int docId) {
geoValues.setDocument(docId);
resize(geoValues.count());
for (int i = 0; i < count(); ++i) {
GeoPoint target = geoValues.valueAt(i);
values[i] = GeoHashUtils.longEncode(target.getLon(), target.getLat(), precision);
}
sort();
}
}
static class CellIdSource extends ValuesSource.Numeric {
private final ValuesSource.GeoPoint valuesSource;
private final int precision;
public CellIdSource(ValuesSource.GeoPoint valuesSource, int precision) {
this.valuesSource = valuesSource;
//different GeoPoints could map to the same or different geohash cells.
this.precision = precision;
}
public int precision() {
return precision;
}
@Override
public boolean isFloatingPoint() {
return false;
}
@Override
public SortedNumericDocValues longValues(LeafReaderContext ctx) {
return new CellValues(valuesSource.geoPointValues(ctx), precision);
}
@Override
public SortedNumericDoubleValues doubleValues(LeafReaderContext ctx) {
throw new UnsupportedOperationException();
}
@Override
public SortedBinaryDocValues bytesValues(LeafReaderContext ctx) {
throw new UnsupportedOperationException();
}
}
}
}
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