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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.search.facet.termsstats.strings;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.CacheRecycler;
import org.elasticsearch.common.lucene.HashedBytesRef;
import org.elasticsearch.common.trove.ExtTHashMap;
import org.elasticsearch.index.fielddata.BytesValues;
import org.elasticsearch.index.fielddata.DoubleValues;
import org.elasticsearch.index.fielddata.IndexFieldData;
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.facet.terms.strings.HashedAggregator;
import org.elasticsearch.search.facet.termsstats.TermsStatsFacet;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
public class TermsStatsStringFacetExecutor extends FacetExecutor {
private final TermsStatsFacet.ComparatorType comparatorType;
final IndexFieldData keyIndexFieldData;
final IndexNumericFieldData valueIndexFieldData;
final SearchScript script;
private final int size;
final ExtTHashMap entries;
long missing;
public TermsStatsStringFacetExecutor(IndexFieldData keyIndexFieldData, IndexNumericFieldData valueIndexFieldData, SearchScript valueScript,
int size, TermsStatsFacet.ComparatorType comparatorType, SearchContext context) {
this.keyIndexFieldData = keyIndexFieldData;
this.valueIndexFieldData = valueIndexFieldData;
this.script = valueScript;
this.size = size;
this.comparatorType = comparatorType;
this.entries = CacheRecycler.popHashMap();
}
@Override
public Collector collector() {
return new Collector();
}
@Override
public InternalFacet buildFacet(String facetName) {
if (entries.isEmpty()) {
return new InternalTermsStatsStringFacet(facetName, comparatorType, size, ImmutableList.of(), missing);
}
if (size == 0) { // all terms
// all terms, just return the collection, we will sort it on the way back
return new InternalTermsStatsStringFacet(facetName, comparatorType, 0 /* indicates all terms*/, entries.values(), missing);
}
Object[] values = entries.internalValues();
Arrays.sort(values, (Comparator) comparatorType.comparator());
List ordered = Lists.newArrayList();
int limit = size;
for (int i = 0; i < limit; i++) {
InternalTermsStatsStringFacet.StringEntry value = (InternalTermsStatsStringFacet.StringEntry) values[i];
if (value == null) {
break;
}
ordered.add(value);
}
CacheRecycler.pushHashMap(entries); // fine to push here, we are done with it
return new InternalTermsStatsStringFacet(facetName, comparatorType, size, ordered, missing);
}
class Collector extends FacetExecutor.Collector {
private final Aggregator aggregator;
private BytesValues keyValues;
public Collector() {
if (script != null) {
this.aggregator = new ScriptAggregator(entries, script);
} else {
this.aggregator = new Aggregator(entries);
}
}
@Override
public void setScorer(Scorer scorer) throws IOException {
if (script != null) {
script.setScorer(scorer);
}
}
@Override
public void setNextReader(AtomicReaderContext context) throws IOException {
keyValues = keyIndexFieldData.load(context).getBytesValues();
if (script != null) {
script.setNextReader(context);
} else {
aggregator.valueValues = valueIndexFieldData.load(context).getDoubleValues();
}
}
@Override
public void collect(int doc) throws IOException {
aggregator.onDoc(doc, keyValues);
}
@Override
public void postCollection() {
TermsStatsStringFacetExecutor.this.missing = aggregator.missing;
aggregator.release();
}
}
public static class Aggregator extends HashedAggregator {
final ExtTHashMap entries;
final HashedBytesRef spare = new HashedBytesRef();
int missing = 0;
DoubleValues valueValues;
ValueAggregator valueAggregator = new ValueAggregator();
public Aggregator(ExtTHashMap entries) {
this.entries = entries;
}
@Override
public void onValue(int docId, BytesRef value, int hashCode, BytesValues values) {
spare.reset(value, hashCode);
InternalTermsStatsStringFacet.StringEntry stringEntry = entries.get(spare);
if (stringEntry == null) {
HashedBytesRef theValue = new HashedBytesRef(values.makeSafe(value), hashCode);
stringEntry = new InternalTermsStatsStringFacet.StringEntry(theValue, 0, 0, 0, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY);
entries.put(theValue, stringEntry);
}
stringEntry.count++;
valueAggregator.stringEntry = stringEntry;
valueAggregator.onDoc(docId, valueValues);
}
public static class ValueAggregator extends DoubleFacetAggregatorBase {
InternalTermsStatsStringFacet.StringEntry stringEntry;
@Override
public void onValue(int docId, double value) {
if (value < stringEntry.min) {
stringEntry.min = value;
}
if (value > stringEntry.max) {
stringEntry.max = value;
}
stringEntry.total += value;
stringEntry.totalCount++;
}
}
}
public static class ScriptAggregator extends Aggregator {
private final SearchScript script;
public ScriptAggregator(ExtTHashMap entries, SearchScript script) {
super(entries);
this.script = script;
}
@Override
public void onValue(int docId, BytesRef value, int hashCode, BytesValues values) {
spare.reset(value, hashCode);
InternalTermsStatsStringFacet.StringEntry stringEntry = entries.get(spare);
if (stringEntry == null) {
HashedBytesRef theValue = new HashedBytesRef(values.makeSafe(value), hashCode);
stringEntry = new InternalTermsStatsStringFacet.StringEntry(theValue, 1, 0, 0, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY);
entries.put(theValue, stringEntry);
} else {
stringEntry.count++;
}
script.setNextDocId(docId);
double valueValue = script.runAsDouble();
if (valueValue < stringEntry.min) {
stringEntry.min = valueValue;
}
if (valueValue > stringEntry.max) {
stringEntry.max = valueValue;
}
stringEntry.total += valueValue;
stringEntry.totalCount++;
}
}
}
