ValuesSourceAggregatorFactory.java example

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package org.elasticsearch.search.aggregations.support;

import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.internal.SearchContext;
import org.joda.time.DateTimeZone;

import java.io.IOException;
import java.util.List;
import java.util.Map;

public abstract class ValuesSourceAggregatorFactory<VS extends ValuesSource, AF extends ValuesSourceAggregatorFactory<VS, AF>>
        extends AggregatorFactory<AF> {

    protected ValuesSourceConfig<VS> config;

    public ValuesSourceAggregatorFactory(String name, ValuesSourceConfig<VS> config, SearchContext context,
            AggregatorFactory<?> parent, AggregatorFactories.Builder subFactoriesBuilder, Map<String, Object> metaData) throws IOException {
        super(name, context, parent, subFactoriesBuilder, metaData);
        this.config = config;
    }

    public DateTimeZone timeZone() {
        return config.timezone();
        }

    @Override
    public Aggregator createInternal(Aggregator parent, boolean collectsFromSingleBucket,
            List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) throws IOException {
        VS vs = config.toValuesSource(context.getQueryShardContext());
        if (vs == null) {
            return createUnmapped(parent, pipelineAggregators, metaData);
        }
        return doCreateInternal(vs, parent, collectsFromSingleBucket, pipelineAggregators, metaData);
    }

    protected abstract Aggregator createUnmapped(Aggregator parent,
            List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) throws IOException;

    protected abstract Aggregator doCreateInternal(VS valuesSource, Aggregator parent,
            boolean collectsFromSingleBucket, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
            throws IOException;

}