org.apache.drill.exec.physical.PhysicalPlan.java Source code

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Here is the source code for org.apache.drill.exec.physical.PhysicalPlan.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.drill.exec.physical;

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

import org.apache.drill.common.graph.Graph;
import org.apache.drill.common.graph.GraphAlgos;
import org.apache.drill.common.logical.PlanProperties;
import org.apache.drill.exec.physical.base.Leaf;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.base.Root;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectReader;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.google.common.collect.Lists;

@JsonPropertyOrder({ "head", "graph" })
public class PhysicalPlan {
    static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(PhysicalPlan.class);

    PlanProperties properties;

    Graph<PhysicalOperator, Root, Leaf> graph;

    @JsonCreator
    public PhysicalPlan(@JsonProperty("head") PlanProperties properties,
            @JsonProperty("graph") List<PhysicalOperator> operators) {
        this.properties = properties;
        this.graph = Graph.newGraph(operators, Root.class, Leaf.class);
    }

    @JsonProperty("graph")
    public List<PhysicalOperator> getSortedOperators() {
        // reverse the list so that nested references are flattened rather than nested.
        return getSortedOperators(true);
    }

    public List<PhysicalOperator> getSortedOperators(boolean reverse) {
        List<PhysicalOperator> list = GraphAlgos.TopoSorter.sort(graph);
        if (reverse) {
            return Lists.reverse(list);
        } else {
            return list;
        }

    }

    @JsonProperty("head")
    public PlanProperties getProperties() {
        return properties;
    }

    /** Parses a physical plan. */
    public static PhysicalPlan parse(ObjectReader reader, String planString) {
        try {
            PhysicalPlan plan = reader.readValue(planString);
            return plan;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /** Converts a physical plan to a string. (Opposite of {@link #parse}.) */
    public String unparse(ObjectWriter writer) {
        try {
            return writer.writeValueAsString(this);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

}