org.apache.druid.query.movingaverage.AveragerFactoryWrapper Maven / Gradle / Ivy
/*
* 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.druid.query.movingaverage;
import org.apache.druid.query.aggregation.Aggregator;
import org.apache.druid.query.aggregation.AggregatorFactory;
import org.apache.druid.query.aggregation.BufferAggregator;
import org.apache.druid.query.movingaverage.averagers.AveragerFactory;
import org.apache.druid.segment.ColumnSelectorFactory;
import javax.annotation.Nullable;
import java.util.Comparator;
import java.util.List;
/**
* A wrapper around averagers that makes them appear to be aggregators.
* This is necessary purely to allow existing common druid code that only knows
* about aggregators to work with the MovingAverageQuery query as well.
*
* NOTE: The {@link AggregatorFactory} abstract class is only partially extended.
* Most methods are not implemented and throw {@link UnsupportedOperationException} if called.
* This is becsuse these methods are invalid for the AveragerFactoryWrapper.
*
* @param Result type
* @param Finalized Result type
*/
public class AveragerFactoryWrapper extends AggregatorFactory
{
private final AveragerFactory af;
private final String prefix;
/**
* Simple constructor
*
* @param af
* @param prefix
*/
public AveragerFactoryWrapper(AveragerFactory af, String prefix)
{
this.af = af;
this.prefix = prefix;
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public Aggregator factorize(ColumnSelectorFactory metricFactory) throws UnsupportedOperationException
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public BufferAggregator factorizeBuffered(ColumnSelectorFactory metricFactory)
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/* (non-Javadoc)
* @see org.apache.druid.query.aggregation.AggregatorFactory#getComparator()
*/
@Override
public Comparator getComparator()
{
return af.getComparator();
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public Object combine(Object lhs, Object rhs)
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public AggregatorFactory getCombiningFactory()
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public List getRequiredColumns()
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public Object deserialize(Object object)
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@SuppressWarnings("unchecked")
@Nullable
@Override
public Object finalizeComputation(@Nullable Object object)
{
return af.finalizeComputation((T) object);
}
/* (non-Javadoc)
* @see org.apache.druid.query.aggregation.AggregatorFactory#getName()
*/
@Override
public String getName()
{
return prefix + af.getName();
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public List requiredFields()
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public byte[] getCacheKey()
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public String getTypeName()
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
/**
* Not implemented. Throws UnsupportedOperationException.
*/
@Override
public int getMaxIntermediateSize()
{
throw new UnsupportedOperationException("Invalid operation for AveragerFactoryWrapper.");
}
}