/*
* Licensed 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 com.facebook.presto.testing;
import com.facebook.presto.operator.DriverContext;
import com.facebook.presto.operator.Operator;
import com.facebook.presto.operator.OperatorContext;
import com.facebook.presto.operator.OperatorFactory;
import com.facebook.presto.operator.OutputFactory;
import com.facebook.presto.operator.Page;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
import static com.google.common.base.Preconditions.checkNotNull;
public class NullOutputOperator
implements Operator
{
public static class NullOutputFactory
implements OutputFactory
{
@Override
public OperatorFactory createOutputOperator(int operatorId, List<Type> sourceType)
{
return new NullOutputOperatorFactory(operatorId, sourceType);
}
}
public static class NullOutputOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final List<Type> types;
public NullOutputOperatorFactory(int operatorId, List<Type> types)
{
this.operatorId = operatorId;
this.types = types;
}
@Override
public List<Type> getTypes()
{
return types;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, NullOutputOperator.class.getSimpleName());
return new NullOutputOperator(operatorContext, types);
}
@Override
public void close()
{
}
}
private final OperatorContext operatorContext;
private final List<Type> types;
private boolean finished;
public NullOutputOperator(OperatorContext operatorContext, List<Type> types)
{
this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");
this.types = ImmutableList.copyOf(checkNotNull(types, "types is null"));
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<Type> getTypes()
{
return types;
}
@Override
public void finish()
{
finished = true;
}
@Override
public boolean isFinished()
{
return finished;
}
@Override
public ListenableFuture<?> isBlocked()
{
return NOT_BLOCKED;
}
@Override
public boolean needsInput()
{
return true;
}
@Override
public void addInput(Page page)
{
operatorContext.recordGeneratedOutput(page.getDataSize(), page.getPositionCount());
}
@Override
public Page getOutput()
{
return null;
}
}