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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.sampler;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.search.aggregations.AbstractAggregationBuilder;
import org.elasticsearch.search.aggregations.AggregatorFactories.Builder;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Objects;
public class SamplerAggregationBuilder extends AbstractAggregationBuilder<SamplerAggregationBuilder> {
public static final String NAME = "sampler";
public static final int DEFAULT_SHARD_SAMPLE_SIZE = 100;
private int shardSize = DEFAULT_SHARD_SAMPLE_SIZE;
public SamplerAggregationBuilder(String name) {
super(name);
}
/**
* Read from a stream.
*/
public SamplerAggregationBuilder(StreamInput in) throws IOException {
super(in);
shardSize = in.readVInt();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeVInt(shardSize);
}
/**
* Set the max num docs to be returned from each shard.
*/
public SamplerAggregationBuilder shardSize(int shardSize) {
this.shardSize = shardSize;
return this;
}
/**
* Get the max num docs to be returned from each shard.
*/
public int shardSize() {
return shardSize;
}
@Override
protected SamplerAggregatorFactory doBuild(SearchContext context, AggregatorFactory<?> parent, Builder subFactoriesBuilder)
throws IOException {
return new SamplerAggregatorFactory(name, shardSize, context, parent, subFactoriesBuilder, metaData);
}
@Override
protected XContentBuilder internalXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
builder.field(SamplerAggregator.SHARD_SIZE_FIELD.getPreferredName(), shardSize);
builder.endObject();
return builder;
}
public static SamplerAggregationBuilder parse(String aggregationName, XContentParser parser) throws IOException {
XContentParser.Token token;
String currentFieldName = null;
Integer shardSize = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.VALUE_NUMBER) {
if (SamplerAggregator.SHARD_SIZE_FIELD.match(currentFieldName)) {
shardSize = parser.intValue();
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unsupported property \"" + currentFieldName + "\" for aggregation \"" + aggregationName);
}
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unsupported property \"" + currentFieldName + "\" for aggregation \"" + aggregationName);
}
}
SamplerAggregationBuilder factory = new SamplerAggregationBuilder(aggregationName);
if (shardSize != null) {
factory.shardSize(shardSize);
}
return factory;
}
@Override
protected int doHashCode() {
return Objects.hash(shardSize);
}
@Override
protected boolean doEquals(Object obj) {
SamplerAggregationBuilder other = (SamplerAggregationBuilder) obj;
return Objects.equals(shardSize, other.shardSize);
}
@Override
public String getType() {
return NAME;
}
}
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