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A module that is everything required to understands Druid Segments
/*
* 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.aggregation;
import com.google.common.collect.Ordering;
import org.apache.druid.segment.BaseFloatColumnValueSelector;
import java.util.Comparator;
/**
*/
public class FloatSumAggregator implements Aggregator
{
static final Comparator COMPARATOR = new Ordering()
{
@Override
public int compare(Object o, Object o1)
{
return Float.compare(((Number) o).floatValue(), ((Number) o1).floatValue());
}
}.nullsFirst();
static double combineValues(Object lhs, Object rhs)
{
return ((Number) lhs).floatValue() + ((Number) rhs).floatValue();
}
private final BaseFloatColumnValueSelector selector;
private float sum;
public FloatSumAggregator(BaseFloatColumnValueSelector selector)
{
this.selector = selector;
this.sum = 0;
}
@Override
public void aggregate()
{
sum += selector.getFloat();
}
@Override
public Object get()
{
return sum;
}
@Override
public float getFloat()
{
return sum;
}
@Override
public long getLong()
{
return (long) sum;
}
@Override
public double getDouble()
{
return (double) sum;
}
@Override
public void close()
{
// no resources to cleanup
}
}