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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;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.BucketCollector;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.LeafBucketCollector;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
/**
* A {@link BucketCollector} that records collected doc IDs and buckets and
* allows to replay a subset of the collected buckets.
*/
public abstract class DeferringBucketCollector extends BucketCollector {
private BucketCollector collector;
/** Sole constructor. */
public DeferringBucketCollector() {}
/** Set the deferred collectors. */
public void setDeferredCollector(Iterable<BucketCollector> deferredCollectors) {
this.collector = BucketCollector.wrap(deferredCollectors);
}
public final void replay(long... selectedBuckets) throws IOException
{
prepareSelectedBuckets(selectedBuckets);
}
public abstract void prepareSelectedBuckets(long... selectedBuckets) throws IOException;
/**
* Wrap the provided aggregator so that it behaves (almost) as if it had
* been collected directly.
*/
public Aggregator wrap(final Aggregator in) {
return new WrappedAggregator(in);
}
protected class WrappedAggregator extends Aggregator {
private Aggregator in;
WrappedAggregator(Aggregator in) {
this.in = in;
}
@Override
public boolean needsScores() {
return in.needsScores();
}
@Override
public void close() {
in.close();
}
@Override
public String name() {
return in.name();
}
@Override
public Aggregator parent() {
return in.parent();
}
@Override
public AggregationContext context() {
return in.context();
}
@Override
public Aggregator subAggregator(String name) {
return in.subAggregator(name);
}
@Override
public InternalAggregation buildAggregation(long bucket) throws IOException {
return in.buildAggregation(bucket);
}
@Override
public InternalAggregation buildEmptyAggregation() {
return in.buildEmptyAggregation();
}
@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext ctx) throws IOException {
throw new IllegalStateException(
"Deferred collectors cannot be collected directly. They must be collected through the recording wrapper.");
}
@Override
public void preCollection() throws IOException {
throw new IllegalStateException(
"Deferred collectors cannot be collected directly. They must be collected through the recording wrapper.");
}
@Override
public void postCollection() throws IOException {
throw new IllegalStateException(
"Deferred collectors cannot be collected directly. They must be collected through the recording wrapper.");
}
}
}
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