exec/java-exec/src/main/java/org/apache/drill/exec/physical/config/MetadataControllerPOP.java

/*
 * 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.config;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import org.apache.drill.exec.physical.base.AbstractBase;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.base.PhysicalVisitor;
import org.apache.drill.exec.metastore.analyze.MetadataControllerContext;
import com.google.common.base.Preconditions;

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

@JsonTypeName("metadataController")
public class MetadataControllerPOP extends AbstractBase {

  public static final String OPERATOR_TYPE = "METADATA_CONTROLLER";

  private final MetadataControllerContext context;
  private final PhysicalOperator left;
  private final PhysicalOperator right;

  @JsonCreator
  public MetadataControllerPOP(@JsonProperty("left") PhysicalOperator left,
      @JsonProperty("right") PhysicalOperator right, @JsonProperty("context") MetadataControllerContext context) {
    this.context = context;
    this.left = left;
    this.right = right;
  }

  @Override
  public <T, X, E extends Throwable> T accept(PhysicalVisitor<T, X, E> physicalVisitor, X value) throws E {
    return physicalVisitor.visitOp(this, value);
  }

  @Override
  public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children) {
    Preconditions.checkArgument(children.size() == 2);
    return new MetadataControllerPOP(children.get(0), children.get(1), context);
  }

  @Override
  public String getOperatorType() {
    return OPERATOR_TYPE;
  }

  @Override
  public Iterator<PhysicalOperator> iterator() {
    return Arrays.asList(left, right).iterator();
  }

  @JsonProperty
  public MetadataControllerContext getContext() {
    return context;
  }

  @JsonProperty
  public PhysicalOperator getLeft() {
    return left;
  }

  @JsonProperty
  public PhysicalOperator getRight() {
    return right;
  }
}