/*
* 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 com.google.common.collect.Lists;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.text.StringText;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.aggregations.AggregationStreams;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.search.aggregations.bucket.BucketStreamContext;
import org.elasticsearch.search.aggregations.bucket.BucketStreams;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
*
*/
public class InternalFilters extends InternalAggregation implements Filters {
public final static Type TYPE = new Type("filters");
private final static AggregationStreams.Stream STREAM = new AggregationStreams.Stream() {
@Override
public InternalFilters readResult(StreamInput in) throws IOException {
InternalFilters filters = new InternalFilters();
filters.readFrom(in);
return filters;
}
};
private final static BucketStreams.Stream<Bucket> BUCKET_STREAM = new BucketStreams.Stream<Bucket>() {
@Override
public Bucket readResult(StreamInput in, BucketStreamContext context) throws IOException {
Bucket filters = new Bucket(context.keyed());
filters.readFrom(in);
return filters;
}
@Override
public BucketStreamContext getBucketStreamContext(Bucket bucket) {
BucketStreamContext context = new BucketStreamContext();
context.keyed(bucket.keyed);
return context;
}
};
public static void registerStream() {
AggregationStreams.registerStream(STREAM, TYPE.stream());
BucketStreams.registerStream(BUCKET_STREAM, TYPE.stream());
}
public static class Bucket implements Filters.Bucket {
private final boolean keyed;
private String key;
private long docCount;
InternalAggregations aggregations;
private Bucket(boolean keyed) {
// for serialization
this.keyed = keyed;
}
public Bucket(String key, long docCount, InternalAggregations aggregations, boolean keyed) {
this.key = key;
this.docCount = docCount;
this.aggregations = aggregations;
this.keyed = keyed;
}
public String getKey() {
return key;
}
@Override
public Text getKeyAsText() {
return new StringText(getKey());
}
@Override
public long getDocCount() {
return docCount;
}
@Override
public Aggregations getAggregations() {
return aggregations;
}
Bucket reduce(List<Bucket> buckets, ReduceContext context) {
Bucket reduced = null;
List<InternalAggregations> aggregationsList = Lists.newArrayListWithCapacity(buckets.size());
for (Bucket bucket : buckets) {
if (reduced == null) {
reduced = new Bucket(bucket.key, bucket.docCount, bucket.aggregations, bucket.keyed);
} else {
reduced.docCount += bucket.docCount;
}
aggregationsList.add(bucket.aggregations);
}
reduced.aggregations = InternalAggregations.reduce(aggregationsList, context);
return reduced;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
if (keyed) {
builder.startObject(key);
} else {
builder.startObject();
}
builder.field(CommonFields.DOC_COUNT, docCount);
aggregations.toXContentInternal(builder, params);
builder.endObject();
return builder;
}
@Override
public void readFrom(StreamInput in) throws IOException {
key = in.readOptionalString();
docCount = in.readVLong();
aggregations = InternalAggregations.readAggregations(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeOptionalString(key);
out.writeVLong(docCount);
aggregations.writeTo(out);
}
}
private List<Bucket> buckets;
private Map<String, Bucket> bucketMap;
private boolean keyed;
public InternalFilters() {} // for serialization
public InternalFilters(String name, List<Bucket> buckets, boolean keyed, Map<String, Object> metaData) {
super(name, metaData);
this.buckets = buckets;
this.keyed = keyed;
}
@Override
public Type type() {
return TYPE;
}
@Override
public List<Bucket> getBuckets() {
return buckets;
}
@Override
public Bucket getBucketByKey(String key) {
if (bucketMap == null) {
bucketMap = new HashMap<>(buckets.size());
for (Bucket bucket : buckets) {
bucketMap.put(bucket.getKey(), bucket);
}
}
return bucketMap.get(key);
}
@Override
public InternalAggregation reduce(ReduceContext reduceContext) {
List<InternalAggregation> aggregations = reduceContext.aggregations();
List<List<Bucket>> bucketsList = null;
for (InternalAggregation aggregation : aggregations) {
InternalFilters filters = (InternalFilters) aggregation;
if (bucketsList == null) {
bucketsList = new ArrayList<>(filters.buckets.size());
for (Bucket bucket : filters.buckets) {
List<Bucket> sameRangeList = new ArrayList<>(aggregations.size());
sameRangeList.add(bucket);
bucketsList.add(sameRangeList);
}
} else {
int i = 0;
for (Bucket bucket : filters.buckets) {
bucketsList.get(i++).add(bucket);
}
}
}
InternalFilters reduced = new InternalFilters(name, new ArrayList<Bucket>(bucketsList.size()), keyed, getMetaData());
for (List<Bucket> sameRangeList : bucketsList) {
reduced.buckets.add((sameRangeList.get(0)).reduce(sameRangeList, reduceContext));
}
return reduced;
}
@Override
protected void doReadFrom(StreamInput in) throws IOException {
keyed = in.readBoolean();
int size = in.readVInt();
List<Bucket> buckets = Lists.newArrayListWithCapacity(size);
for (int i = 0; i < size; i++) {
Bucket bucket = new Bucket(keyed);
bucket.readFrom(in);
buckets.add(bucket);
}
this.buckets = buckets;
this.bucketMap = null;
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeBoolean(keyed);
out.writeVInt(buckets.size());
for (Bucket bucket : buckets) {
bucket.writeTo(out);
}
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
if (keyed) {
builder.startObject(CommonFields.BUCKETS);
} else {
builder.startArray(CommonFields.BUCKETS);
}
for (Bucket bucket : buckets) {
bucket.toXContent(builder, params);
}
if (keyed) {
builder.endObject();
} else {
builder.endArray();
}
return builder;
}
}