org.elasticsearch.search.aggregations.metrics.scripted.ScriptedMetricAggregatorFactory Maven / Gradle / Ivy

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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.scripted;

import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.SearchParseException;
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.elasticsearch.search.lookup.SearchLookup;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;

public class ScriptedMetricAggregatorFactory extends AggregatorFactory {

    private final SearchScript.Factory mapScript;
    private final ExecutableScript.Factory combineScript;
    private final Script reduceScript;
    private final Map params;
    private final SearchLookup lookup;
    private final ExecutableScript.Factory initScript;

    public ScriptedMetricAggregatorFactory(String name, SearchScript.Factory mapScript, ExecutableScript.Factory initScript,
                                           ExecutableScript.Factory combineScript, Script reduceScript, Map params,
                                           SearchLookup lookup, SearchContext context, AggregatorFactory parent,
                                           AggregatorFactories.Builder subFactories, Map metaData) throws IOException {
        super(name, context, parent, subFactories, metaData);
        this.mapScript = mapScript;
        this.initScript = initScript;
        this.combineScript = combineScript;
        this.reduceScript = reduceScript;
        this.lookup = lookup;
        this.params = params;
    }

    @Override
    public Aggregator createInternal(Aggregator parent, boolean collectsFromSingleBucket, List pipelineAggregators,
            Map metaData) throws IOException {
        if (collectsFromSingleBucket == false) {
            return asMultiBucketAggregator(this, context, parent);
        }
        Map params = this.params;
        if (params != null) {
            params = deepCopyParams(params, context);
        } else {
            params = new HashMap<>();
        }
        if (params.containsKey("_agg") == false) {
            params.put("_agg", new HashMap());
        }

        final ExecutableScript initScript = this.initScript.newInstance(params);
        final SearchScript.LeafFactory mapScript = this.mapScript.newFactory(params, lookup);
        final ExecutableScript combineScript = this.combineScript.newInstance(params);

        final Script reduceScript = deepCopyScript(this.reduceScript, context);
        if (initScript != null) {
            initScript.run();
        }
        return new ScriptedMetricAggregator(name, mapScript,
                combineScript, reduceScript, params, context, parent,
                pipelineAggregators, metaData);
    }

    private static Script deepCopyScript(Script script, SearchContext context) {
        if (script != null) {
            Map params = script.getParams();
            if (params != null) {
                params = deepCopyParams(params, context);
            }
            return new Script(script.getType(), script.getLang(), script.getIdOrCode(), params);
        } else {
            return null;
        }
    }

    @SuppressWarnings({ "unchecked" })
    private static  T deepCopyParams(T original, SearchContext context) {
        T clone;
        if (original instanceof Map) {
            Map originalMap = (Map) original;
            Map clonedMap = new HashMap<>();
            for (Map.Entry e : originalMap.entrySet()) {
                clonedMap.put(deepCopyParams(e.getKey(), context), deepCopyParams(e.getValue(), context));
            }
            clone = (T) clonedMap;
        } else if (original instanceof List) {
            List originalList = (List) original;
            List