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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.filters;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.Weight;
import org.apache.lucene.util.Bits;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.lucene.Lucene;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.index.query.EmptyQueryBuilder;
import org.elasticsearch.index.query.MatchAllQueryBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.search.aggregations.LeafBucketCollector;
import org.elasticsearch.search.aggregations.LeafBucketCollectorBase;
import org.elasticsearch.search.aggregations.bucket.BucketsAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
/**
*
*/
public class FiltersAggregator extends BucketsAggregator {
public static final ParseField FILTERS_FIELD = new ParseField("filters");
public static final ParseField OTHER_BUCKET_FIELD = new ParseField("other_bucket");
public static final ParseField OTHER_BUCKET_KEY_FIELD = new ParseField("other_bucket_key");
public static class KeyedFilter implements Writeable, ToXContent {
private final String key;
private final QueryBuilder filter;
public KeyedFilter(String key, QueryBuilder filter) {
if (key == null) {
throw new IllegalArgumentException("[key] must not be null");
}
if (filter == null) {
throw new IllegalArgumentException("[filter] must not be null");
}
this.key = key;
if (filter instanceof EmptyQueryBuilder) {
this.filter = new MatchAllQueryBuilder();
} else {
this.filter = filter;
}
}
/**
* Read from a stream.
*/
public KeyedFilter(StreamInput in) throws IOException {
key = in.readString();
filter = in.readNamedWriteable(QueryBuilder.class);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeString(key);
out.writeNamedWriteable(filter);
}
public String key() {
return key;
}
public QueryBuilder filter() {
return filter;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.field(key, filter);
return builder;
}
@Override
public int hashCode() {
return Objects.hash(key, filter);
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
KeyedFilter other = (KeyedFilter) obj;
return Objects.equals(key, other.key)
&& Objects.equals(filter, other.filter);
}
}
private final String[] keys;
private Weight[] filters;
private final boolean keyed;
private final boolean showOtherBucket;
private final String otherBucketKey;
private final int totalNumKeys;
public FiltersAggregator(String name, AggregatorFactories factories, String[] keys, Weight[] filters, boolean keyed, String otherBucketKey,
AggregationContext aggregationContext,
Aggregator parent, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
throws IOException {
super(name, factories, aggregationContext, parent, pipelineAggregators, metaData);
this.keyed = keyed;
this.keys = keys;
this.filters = filters;
this.showOtherBucket = otherBucketKey != null;
this.otherBucketKey = otherBucketKey;
if (showOtherBucket) {
this.totalNumKeys = keys.length + 1;
} else {
this.totalNumKeys = keys.length;
}
}
@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext ctx,
final LeafBucketCollector sub) throws IOException {
// no need to provide deleted docs to the filter
final Bits[] bits = new Bits[filters.length];
for (int i = 0; i < filters.length; ++i) {
bits[i] = Lucene.asSequentialAccessBits(ctx.reader().maxDoc(), filters[i].scorer(ctx));
}
return new LeafBucketCollectorBase(sub, null) {
@Override
public void collect(int doc, long bucket) throws IOException {
boolean matched = false;
for (int i = 0; i < bits.length; i++) {
if (bits[i].get(doc)) {
collectBucket(sub, doc, bucketOrd(bucket, i));
matched = true;
}
}
if (showOtherBucket && !matched) {
collectBucket(sub, doc, bucketOrd(bucket, bits.length));
}
}
};
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) throws IOException {
List<InternalFilters.InternalBucket> buckets = new ArrayList<>(filters.length);
for (int i = 0; i < keys.length; i++) {
long bucketOrd = bucketOrd(owningBucketOrdinal, i);
InternalFilters.InternalBucket bucket = new InternalFilters.InternalBucket(keys[i], bucketDocCount(bucketOrd), bucketAggregations(bucketOrd), keyed);
buckets.add(bucket);
}
// other bucket
if (showOtherBucket) {
long bucketOrd = bucketOrd(owningBucketOrdinal, keys.length);
InternalFilters.InternalBucket bucket = new InternalFilters.InternalBucket(otherBucketKey, bucketDocCount(bucketOrd),
bucketAggregations(bucketOrd), keyed);
buckets.add(bucket);
}
return new InternalFilters(name, buckets, keyed, pipelineAggregators(), metaData());
}
@Override
public InternalAggregation buildEmptyAggregation() {
InternalAggregations subAggs = buildEmptySubAggregations();
List<InternalFilters.InternalBucket> buckets = new ArrayList<>(filters.length);
for (int i = 0; i < keys.length; i++) {
InternalFilters.InternalBucket bucket = new InternalFilters.InternalBucket(keys[i], 0, subAggs, keyed);
buckets.add(bucket);
}
if (showOtherBucket) {
InternalFilters.InternalBucket bucket = new InternalFilters.InternalBucket(otherBucketKey, 0, subAggs, keyed);
buckets.add(bucket);
}
return new InternalFilters(name, buckets, keyed, pipelineAggregators(), metaData());
}
final long bucketOrd(long owningBucketOrdinal, int filterOrd) {
return owningBucketOrdinal * totalNumKeys + filterOrd;
}
}
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