/*
* 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;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.common.lease.Releasable;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.LongHash;
import java.io.IOException;
/**
* Filters a collection stream of docIds and related buckets using a sorted
* list of valid bucket ordinals.
*/
public class FilteringBucketCollector extends BucketCollector implements Releasable {
private final LongHash denseMap;
private final BucketCollector delegate;
/**
*
* @param the valid BucketOrds
* @param delegate The collector that will be called for any buckets listed in sortedBucketOrds
*/
public FilteringBucketCollector(long[] validBucketOrds, BucketCollector delegate, BigArrays bigArrays) {
denseMap = new LongHash(validBucketOrds.length, bigArrays);
for (int i = 0; i < validBucketOrds.length; i++) {
denseMap.add(validBucketOrds[i]);
}
this.delegate = delegate;
}
@Override
public final void setNextReader(LeafReaderContext reader) {
delegate.setNextReader(reader);
}
@Override
public final void collect(int docId, long bucketOrdinal) throws IOException {
long ordinal = denseMap.find(bucketOrdinal);
if (ordinal >= 0) {
delegate.collect(docId, ordinal);
}
}
@Override
public final void postCollection() throws IOException {
delegate.postCollection();
}
@Override
public void close() throws ElasticsearchException {
Releasables.close(denseMap);
}
@Override
public void gatherAnalysis(BucketAnalysisCollector analysisCollector, long bucketOrdinal){
long ordinal = denseMap.find(bucketOrdinal);
if (ordinal >= 0) {
delegate.gatherAnalysis(analysisCollector, ordinal);
} else {
throw new ElasticsearchIllegalArgumentException("Aggregation requested on a missing bucket #" + bucketOrdinal);
}
}
}