io.druid.query.aggregation.FloatMaxAggregator Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.query.aggregation;
import io.druid.segment.FloatColumnSelector;
/**
*/
public class FloatMaxAggregator implements Aggregator
{
static double combineValues(Object lhs, Object rhs)
{
return Math.max(((Number) lhs).floatValue(), ((Number) rhs).floatValue());
}
private final FloatColumnSelector selector;
private float max;
public FloatMaxAggregator(FloatColumnSelector selector)
{
this.selector = selector;
reset();
}
@Override
public void aggregate()
{
max = Math.max(max, selector.getFloat());
}
@Override
public void reset()
{
max = Float.NEGATIVE_INFINITY;
}
@Override
public Object get()
{
return max;
}
@Override
public float getFloat()
{
return max;
}
@Override
public long getLong()
{
return (long) max;
}
@Override
public double getDouble()
{
return (double) max;
}
@Override
public Aggregator clone()
{
return new FloatMaxAggregator(selector);
}
@Override
public void close()
{
// no resources to cleanup
}
}