io.crate.planner.consumer.ConsumingPlanner.java Source code

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Here is the source code for io.crate.planner.consumer.ConsumingPlanner.java

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/*
 * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
 * license agreements.  See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial agreement.
 */

package io.crate.planner.consumer;

import com.google.common.collect.Iterables;
import io.crate.analyze.AnalysisMetaData;
import io.crate.analyze.relations.AnalyzedRelation;
import io.crate.analyze.relations.PlannedAnalyzedRelation;
import io.crate.analyze.relations.TableRelation;
import io.crate.planner.Plan;
import io.crate.sql.tree.QualifiedName;

import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class ConsumingPlanner {

    private final List<Consumer> consumers = new ArrayList<>();

    public ConsumingPlanner(AnalysisMetaData analysisMetaData) {
        consumers.add(new NonDistributedGroupByConsumer(analysisMetaData));
        consumers.add(new ReduceOnCollectorGroupByConsumer(analysisMetaData));
        consumers.add(new DistributedGroupByConsumer(analysisMetaData));
        consumers.add(new ESCountConsumer(analysisMetaData));
        consumers.add(new GlobalAggregateConsumer(analysisMetaData));
        consumers.add(new ESGetConsumer(analysisMetaData));
        consumers.add(new QueryThenFetchConsumer(analysisMetaData));
        consumers.add(new UpdateConsumer(analysisMetaData));
        consumers.add(new InsertFromSubQueryConsumer(analysisMetaData));
        consumers.add(new QueryAndFetchConsumer(analysisMetaData));
    }

    @Nullable
    public Plan plan(AnalyzedRelation rootRelation) {
        ConsumerContext consumerContext = new ConsumerContext(rootRelation);

        for (int i = 0; i < consumers.size(); i++) {
            Consumer consumer = consumers.get(i);
            if (consumer.consume(consumerContext.rootRelation(), consumerContext)) {
                if (consumerContext.rootRelation() instanceof PlannedAnalyzedRelation) {
                    Plan plan = ((PlannedAnalyzedRelation) consumerContext.rootRelation()).plan();
                    assert plan != null;
                    return plan;
                } else {
                    i = 0;
                }
            }
        }
        if (consumerContext.validationException() != null) {
            throw consumerContext.validationException();
        }
        return null;
    }

    @Nullable
    public static TableRelation getSingleTableRelation(Map<QualifiedName, AnalyzedRelation> sources) {
        if (sources.size() != 1) {
            return null;
        }
        AnalyzedRelation sourceRelation = Iterables.getOnlyElement(sources.values());
        if (sourceRelation instanceof TableRelation) {
            return (TableRelation) sourceRelation;
        }
        return null;
    }
}