/**
* 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.ref.rops;
import java.util.List;
import org.apache.drill.common.logical.data.SingleInputOperator;
import org.apache.drill.exec.ref.IteratorRegistry;
import org.apache.drill.exec.ref.RecordIterator;
import org.apache.drill.exec.ref.RecordPointer;
import org.apache.drill.exec.ref.exceptions.SetupException;
public abstract class SingleInputROPBase<T extends SingleInputOperator> extends ROPBase<T>{
protected RecordPointer record;
public SingleInputROPBase(T config) {
super(config);
}
@Override
protected void setupIterators(IteratorRegistry registry) {
List<RecordIterator> iters = registry.getOperator(config.getInput());
if(iters.size() != 1) throw new IllegalArgumentException(String.format("Expected one input iterator for class %s. Received %d", this.getClass().getCanonicalName(), iters.size()));
RecordIterator i = iters.get(0);
this.record = i.getRecordPointer();
if(record == null) throw new SetupException(String.format("The %s op iterator return a null record pointer.", i.getParent()));
setInput(i);
}
protected abstract void setInput(RecordIterator incoming);
}