/*
* Copyright (c) 2015 Vincent Royer (vroyer@vroyer.org).
* Contains some code from Elasticsearch (http://www.elastic.co)
*
* Licensed 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.elassandra.shard.aggregations.bucket.token;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
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.InternalMultiBucketAggregation;
import org.elasticsearch.search.aggregations.bucket.BucketStreamContext;
import org.elasticsearch.search.aggregations.bucket.BucketStreams;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.format.ValueFormatter;
import org.elasticsearch.search.aggregations.support.format.ValueFormatterStreams;
/**
*
*/
public class InternalRange<B extends InternalRange.Bucket, R extends InternalRange<B, R>> extends InternalMultiBucketAggregation<R, B>
implements Range {
static final Factory FACTORY = new Factory();
public final static Type TYPE = new Type("token_range");
private final static AggregationStreams.Stream STREAM = new AggregationStreams.Stream() {
@Override
public InternalRange readResult(StreamInput in) throws IOException {
InternalRange ranges = new InternalRange();
ranges.readFrom(in);
return ranges;
}
};
private final static BucketStreams.Stream<Bucket> BUCKET_STREAM = new BucketStreams.Stream<Bucket>() {
@Override
public Bucket readResult(StreamInput in, BucketStreamContext context) throws IOException {
Bucket buckets = new Bucket(context.keyed(), context.formatter());
buckets.readFrom(in);
return buckets;
}
@Override
public BucketStreamContext getBucketStreamContext(Bucket bucket) {
BucketStreamContext context = new BucketStreamContext();
context.formatter(bucket.formatter);
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 extends InternalMultiBucketAggregation.InternalBucket implements Range.Bucket {
protected transient final boolean keyed;
protected transient final ValueFormatter formatter;
protected long from;
protected long to;
private long docCount;
InternalAggregations aggregations;
private String key;
public Bucket(boolean keyed, ValueFormatter formatter) {
this.keyed = keyed;
this.formatter = formatter;
}
public Bucket(String key, long from, long to, long docCount, InternalAggregations aggregations, boolean keyed,
ValueFormatter formatter) {
this(keyed, formatter);
this.key = key != null ? key : generateKey(from, to, formatter);
this.from = from;
this.to = to;
this.docCount = docCount;
this.aggregations = aggregations;
}
@Override
public String getKey() {
return getKeyAsString();
}
@Override
public String getKeyAsString() {
return key;
}
@Override
public Object getFrom() {
return from;
}
@Override
public Object getTo() {
return to;
}
public boolean getKeyed() {
return keyed;
}
public ValueFormatter getFormatter() {
return formatter;
}
@Override
public String getFromAsString() {
return formatter.format(from);
}
@Override
public String getToAsString() {
return formatter.format(to);
}
@Override
public long getDocCount() {
return docCount;
}
@Override
public Aggregations getAggregations() {
return aggregations;
}
protected Factory<? extends Bucket, ?> getFactory() {
return FACTORY;
}
Bucket reduce(List<Bucket> ranges, ReduceContext context) {
long docCount = 0;
List<InternalAggregations> aggregationsList = new ArrayList<>(ranges.size());
for (Bucket range : ranges) {
docCount += range.docCount;
aggregationsList.add(range.aggregations);
}
final InternalAggregations aggs = InternalAggregations.reduce(aggregationsList, context);
return getFactory().createBucket(key, from, to, docCount, aggs, keyed, formatter);
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
if (keyed) {
builder.startObject(key);
} else {
builder.startObject();
builder.field(CommonFields.KEY, key);
}
if (!Double.isInfinite(from)) {
builder.field(CommonFields.FROM, from);
if (formatter != null) {
builder.field(CommonFields.FROM_AS_STRING, formatter.format(from));
}
}
if (!Double.isInfinite(to)) {
builder.field(CommonFields.TO, to);
if (formatter != null) {
builder.field(CommonFields.TO_AS_STRING, formatter.format(to));
}
}
builder.field(CommonFields.DOC_COUNT, docCount);
aggregations.toXContentInternal(builder, params);
builder.endObject();
return builder;
}
protected String generateKey(long from, long to, ValueFormatter formatter) {
StringBuilder sb = new StringBuilder();
sb.append('(').append(formatter.format(from)).append(',').append(formatter.format(to)).append(']');
return sb.toString();
}
@Override
public void readFrom(StreamInput in) throws IOException {
}
@Override
public void writeTo(StreamOutput out) throws IOException {
}
}
public static class Factory<B extends Bucket, R extends InternalRange<B, R>> {
public String type() {
return TYPE.name();
}
public R create(String name, List<B> ranges, ValueFormatter formatter, boolean keyed, List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) {
return (R) new InternalRange<>(name, ranges, formatter, keyed, pipelineAggregators, metaData);
}
public B createBucket(String key, long from, long to, long docCount, InternalAggregations aggregations, boolean keyed,
ValueFormatter formatter) {
return (B) new Bucket(key, from, to, docCount, aggregations, keyed, formatter);
}
public R create(List<B> ranges, R prototype) {
return (R) new InternalRange<>(prototype.name, ranges, prototype.formatter, prototype.keyed, prototype.pipelineAggregators(),
prototype.metaData);
}
public B createBucket(InternalAggregations aggregations, B prototype) {
return (B) new Bucket(prototype.getKey(), prototype.from, prototype.to, prototype.getDocCount(), aggregations, prototype.keyed,
prototype.formatter);
}
}
private List<B> ranges;
private Map<String, B> rangeMap;
protected ValueFormatter formatter;
protected boolean keyed;
public InternalRange() {} // for serialization
public InternalRange(String name, List<B> ranges, ValueFormatter formatter, boolean keyed,
List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) {
super(name, pipelineAggregators, metaData);
this.ranges = ranges;
this.formatter = formatter;
this.keyed = keyed;
}
@Override
public Type type() {
return TYPE;
}
@Override
public List<B> getBuckets() {
return ranges;
}
public Factory<B, R> getFactory() {
return FACTORY;
}
@Override
public R create(List<B> buckets) {
return getFactory().create(buckets, (R) this);
}
@Override
public B createBucket(InternalAggregations aggregations, B prototype) {
return getFactory().createBucket(aggregations, prototype);
}
@Override
public InternalAggregation doReduce(List<InternalAggregation> aggregations, ReduceContext reduceContext) {
@SuppressWarnings("unchecked")
List<Bucket>[] rangeList = new List[ranges.size()];
for (int i = 0; i < rangeList.length; ++i) {
rangeList[i] = new ArrayList<Bucket>();
}
for (InternalAggregation aggregation : aggregations) {
InternalRange<B, R> ranges = (InternalRange<B, R>) aggregation;
int i = 0;
for (Bucket range : ranges.ranges) {
rangeList[i++].add(range);
}
}
final List<B> ranges = new ArrayList<>();
for (int i = 0; i < this.ranges.size(); ++i) {
ranges.add((B) rangeList[i].get(0).reduce(rangeList[i], reduceContext));
}
return getFactory().create(name, ranges, formatter, keyed, pipelineAggregators(), getMetaData());
}
@Override
protected void doReadFrom(StreamInput in) throws IOException {
formatter = ValueFormatterStreams.readOptional(in);
keyed = in.readBoolean();
int size = in.readVInt();
List<B> ranges = new ArrayList<>(size);
for (int i = 0; i < size; i++) {
String key = in.readOptionalString();
ranges.add(getFactory().createBucket(key, in.readLong(), in.readLong(), in.readVLong(), InternalAggregations.readAggregations(in), keyed, formatter));
}
this.ranges = ranges;
this.rangeMap = null;
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
ValueFormatterStreams.writeOptional(formatter, out);
out.writeBoolean(keyed);
out.writeVInt(ranges.size());
for (B bucket : ranges) {
out.writeOptionalString(((Bucket) bucket).key);
out.writeDouble(((Bucket) bucket).from);
out.writeDouble(((Bucket) bucket).to);
out.writeVLong(((Bucket) bucket).docCount);
bucket.aggregations.writeTo(out);
}
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
if (keyed) {
builder.startObject(CommonFields.BUCKETS);
} else {
builder.startArray(CommonFields.BUCKETS);
}
for (B range : ranges) {
range.toXContent(builder, params);
}
if (keyed) {
builder.endObject();
} else {
builder.endArray();
}
return builder;
}
}