org.apache.drill.exec.planner.AbstractOpWrapperVisitor Maven / Gradle / Ivy

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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.planner;

import org.apache.drill.exec.physical.base.AbstractPhysicalVisitor;
import org.apache.drill.exec.physical.base.Exchange;
import org.apache.drill.exec.planner.fragment.Wrapper;

public abstract class AbstractOpWrapperVisitor extends
    AbstractPhysicalVisitor {
  static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(AbstractOpWrapperVisitor.class);

  @Override
  public final RET visitExchange(Exchange exchange, Wrapper wrapper) throws EXCEP {
    if (wrapper.getNode().getSendingExchange() == exchange) {
      return visitSendingExchange(exchange, wrapper);
    } else {
      return visitReceivingExchange(exchange, wrapper);
    }
  }

  public RET visitSendingExchange(Exchange exchange, Wrapper wrapper) throws EXCEP {
    return visitOp(exchange, wrapper);
  }

  public RET visitReceivingExchange(Exchange exchange, Wrapper wrapper) throws EXCEP {
    return visitOp(exchange, wrapper);
  }

}