/**
* 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<RET, EXCEP extends Throwable> extends
AbstractPhysicalVisitor<RET, Wrapper, EXCEP> {
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);
}
}