org.elasticsearch.search.facet.histogram.ValueScriptHistogramFacetExecutor Maven / Gradle / Ivy
/*
* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.facet.histogram;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.Scorer;
import org.elasticsearch.common.CacheRecycler;
import org.elasticsearch.common.trove.ExtTLongObjectHashMap;
import org.elasticsearch.index.fielddata.DoubleValues;
import org.elasticsearch.index.fielddata.IndexNumericFieldData;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.facet.DoubleFacetAggregatorBase;
import org.elasticsearch.search.facet.FacetExecutor;
import org.elasticsearch.search.facet.InternalFacet;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Map;
/**
* A histogram facet collector that uses the same field as the key as well as the
* value.
*/
public class ValueScriptHistogramFacetExecutor extends FacetExecutor {
private final IndexNumericFieldData indexFieldData;
private final HistogramFacet.ComparatorType comparatorType;
final SearchScript valueScript;
final long interval;
final ExtTLongObjectHashMap entries;
public ValueScriptHistogramFacetExecutor(IndexNumericFieldData indexFieldData, String scriptLang, String valueScript, Map params, long interval, HistogramFacet.ComparatorType comparatorType, SearchContext context) {
this.comparatorType = comparatorType;
this.indexFieldData = indexFieldData;
this.interval = interval;
this.valueScript = context.scriptService().search(context.lookup(), scriptLang, valueScript, params);
this.entries = CacheRecycler.popLongObjectMap();
}
@Override
public Collector collector() {
return new Collector();
}
@Override
public InternalFacet buildFacet(String facetName) {
return new InternalFullHistogramFacet(facetName, comparatorType, entries, true);
}
public static long bucket(double value, long interval) {
return (((long) (value / interval)) * interval);
}
class Collector extends FacetExecutor.Collector {
private DoubleValues values;
private final HistogramProc histoProc;
public Collector() {
histoProc = new HistogramProc(interval, valueScript, entries);
}
@Override
public void setScorer(Scorer scorer) throws IOException {
valueScript.setScorer(scorer);
}
@Override
public void setNextReader(AtomicReaderContext context) throws IOException {
values = indexFieldData.load(context).getDoubleValues();
valueScript.setNextReader(context);
}
@Override
public void collect(int doc) throws IOException {
histoProc.onDoc(doc, values);
}
@Override
public void postCollection() {
}
}
public static class HistogramProc extends DoubleFacetAggregatorBase {
private final long interval;
private final SearchScript valueScript;
final ExtTLongObjectHashMap entries;
public HistogramProc(long interval, SearchScript valueScript, ExtTLongObjectHashMap entries) {
this.interval = interval;
this.valueScript = valueScript;
this.entries = entries;
}
@Override
public void onValue(int docId, double value) {
valueScript.setNextDocId(docId);
long bucket = bucket(value, interval);
double scriptValue = valueScript.runAsDouble();
InternalFullHistogramFacet.FullEntry entry = entries.get(bucket);
if (entry == null) {
entry = new InternalFullHistogramFacet.FullEntry(bucket, 1, scriptValue, scriptValue, 1, scriptValue);
entries.put(bucket, entry);
} else {
entry.count++;
entry.totalCount++;
entry.total += scriptValue;
if (scriptValue < entry.min) {
entry.min = scriptValue;
}
if (scriptValue > entry.max) {
entry.max = scriptValue;
}
}
}
}
}