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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.metrics.valuecount;
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.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.InternalNumericMetricsAggregation;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.format.ValueFormatter;
import org.elasticsearch.search.aggregations.support.format.ValueFormatterStreams;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/**
* An internal implementation of {@link ValueCount}.
*/
public class InternalValueCount extends InternalNumericMetricsAggregation.SingleValue implements ValueCount {
public static final Type TYPE = new Type("value_count", "vcount");
private static final AggregationStreams.Stream STREAM = new AggregationStreams.Stream() {
@Override
public InternalValueCount readResult(StreamInput in) throws IOException {
InternalValueCount count = new InternalValueCount();
count.readFrom(in);
return count;
}
};
public static void registerStreams() {
AggregationStreams.registerStream(STREAM, TYPE.stream());
}
private long value;
InternalValueCount() {} // for serialization
public InternalValueCount(String name, long value, ValueFormatter formatter, List pipelineAggregators,
Map metaData) {
super(name, pipelineAggregators, metaData);
this.value = value;
this.valueFormatter = formatter;
}
@Override
public long getValue() {
return value;
}
@Override
public double value() {
return value;
}
@Override
public Type type() {
return TYPE;
}
@Override
public InternalAggregation doReduce(List aggregations, ReduceContext reduceContext) {
long valueCount = 0;
for (InternalAggregation aggregation : aggregations) {
valueCount += ((InternalValueCount) aggregation).value;
}
return new InternalValueCount(name, valueCount, valueFormatter, pipelineAggregators(), getMetaData());
}
@Override
protected void doReadFrom(StreamInput in) throws IOException {
valueFormatter = ValueFormatterStreams.readOptional(in);
value = in.readVLong();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
ValueFormatterStreams.writeOptional(valueFormatter, out);
out.writeVLong(value);
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
builder.field(CommonFields.VALUE, value);
if (!(valueFormatter instanceof ValueFormatter.Raw)) {
builder.field(CommonFields.VALUE_AS_STRING, valueFormatter.format(value));
}
return builder;
}
@Override
public String toString() {
return "count[" + value + "]";
}
}