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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.percentiles;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.Version;
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.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.InternalNumericMetricsAggregation;
import org.elasticsearch.search.aggregations.metrics.percentiles.tdigest.TDigestState;
import org.elasticsearch.search.aggregations.support.format.ValueFormatterStreams;
import java.io.IOException;
import java.util.List;
import java.util.Map;
abstract class AbstractInternalPercentiles extends InternalNumericMetricsAggregation.MultiValue {
protected double[] keys;
protected TDigestState state;
private boolean keyed;
AbstractInternalPercentiles() {} // for serialization
public AbstractInternalPercentiles(String name, double[] keys, TDigestState state, boolean keyed, Map<String, Object> metaData) {
super(name, metaData);
this.keys = keys;
this.state = state;
this.keyed = keyed;
}
@Override
public double value(String name) {
return value(Double.parseDouble(name));
}
public abstract double value(double key);
@Override
public AbstractInternalPercentiles reduce(ReduceContext reduceContext) {
List<InternalAggregation> aggregations = reduceContext.aggregations();
TDigestState merged = null;
for (InternalAggregation aggregation : aggregations) {
final AbstractInternalPercentiles percentiles = (AbstractInternalPercentiles) aggregation;
if (merged == null) {
merged = new TDigestState(percentiles.state.compression());
}
merged.add(percentiles.state);
}
return createReduced(getName(), keys, merged, keyed, getMetaData());
}
protected abstract AbstractInternalPercentiles createReduced(String name, double[] keys, TDigestState merged, boolean keyed, Map<String, Object> metaData);
@Override
protected void doReadFrom(StreamInput in) throws IOException {
valueFormatter = ValueFormatterStreams.readOptional(in);
if (in.getVersion().before(Version.V_1_2_0)) {
final byte id = in.readByte();
if (id != 0) {
throw new ElasticsearchIllegalArgumentException("Unexpected percentiles aggregator id [" + id + "]");
}
}
keys = new double[in.readInt()];
for (int i = 0; i < keys.length; ++i) {
keys[i] = in.readDouble();
}
state = TDigestState.read(in);
keyed = in.readBoolean();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
ValueFormatterStreams.writeOptional(valueFormatter, out);
if (out.getVersion().before(Version.V_1_2_0)) {
out.writeByte((byte) 0);
}
out.writeInt(keys.length);
for (int i = 0 ; i < keys.length; ++i) {
out.writeDouble(keys[i]);
}
TDigestState.write(state, out);
out.writeBoolean(keyed);
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
if (keyed) {
builder.startObject(CommonFields.VALUES);
for(int i = 0; i < keys.length; ++i) {
String key = String.valueOf(keys[i]);
double value = value(keys[i]);
builder.field(key, value);
if (valueFormatter != null) {
builder.field(key + "_as_string", valueFormatter.format(value));
}
}
builder.endObject();
} else {
builder.startArray(CommonFields.VALUES);
for (int i = 0; i < keys.length; i++) {
double value = value(keys[i]);
builder.startObject();
builder.field(CommonFields.KEY, keys[i]);
builder.field(CommonFields.VALUE, value);
if (valueFormatter != null) {
builder.field(CommonFields.VALUE_AS_STRING, valueFormatter.format(value));
}
builder.endObject();
}
builder.endArray();
}
return builder;
}
}