/*
* 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.flink.api.java.summarize.aggregation;
import static org.apache.flink.api.java.summarize.aggregation.CompensatedSum.ZERO;
import org.apache.flink.annotation.Internal;
/**
* Aggregator that can handle Double types
*/
@Internal
public class DoubleSummaryAggregator extends NumericSummaryAggregator<Double> {
// Nested classes are only "public static" for Kryo serialization, otherwise they'd be private
public static class MinDoubleAggregator implements Aggregator<Double,Double> {
private double min = Double.MAX_VALUE;
@Override
public void aggregate(Double value) {
min = Math.min(min, value);
}
@Override
public void combine(Aggregator<Double, Double> other) {
min = Math.min(min,((MinDoubleAggregator)other).min);
}
@Override
public Double result() {
return min;
}
}
public static class MaxDoubleAggregator implements Aggregator<Double,Double> {
private double max = Double.MIN_VALUE;
@Override
public void aggregate(Double value) {
max = Math.max(max, value);
}
@Override
public void combine(Aggregator<Double, Double> other) {
max = Math.max(max, ((MaxDoubleAggregator) other).max);
}
@Override
public Double result() {
return max;
}
}
public static class SumDoubleAggregator implements Aggregator<Double,Double> {
private CompensatedSum sum = ZERO;
@Override
public void aggregate(Double value) {
sum = sum.add(value);
}
@Override
public void combine(Aggregator<Double, Double> other) {
sum = sum.add(((SumDoubleAggregator)other).sum);
}
@Override
public Double result() {
return sum.value();
}
}
@Override
protected Aggregator<Double, Double> initMin() {
return new MinDoubleAggregator();
}
@Override
protected Aggregator<Double, Double> initMax() {
return new MaxDoubleAggregator();
}
@Override
protected Aggregator<Double, Double> initSum() {
return new SumDoubleAggregator();
}
@Override
protected boolean isNan(Double number) {
return number.isNaN();
}
@Override
protected boolean isInfinite(Double number) {
return number.isInfinite();
}
}