/*
* 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 org.apache.flink.annotation.Internal;
/**
* Aggregator that can handle Integer types
*/
@Internal
public class IntegerSummaryAggregator extends NumericSummaryAggregator<Integer> {
private static final long serialVersionUID = 1L;
// Nested classes are only "public static" for Kryo serialization, otherwise they'd be private
public static class MinIntegerAggregator implements Aggregator<Integer,Integer> {
private int min = Integer.MAX_VALUE;
@Override
public void aggregate(Integer value) {
min = Math.min(min, value);
}
@Override
public void combine(Aggregator<Integer, Integer> other) {
min = Math.min(min,((MinIntegerAggregator)other).min);
}
@Override
public Integer result() {
return min;
}
}
public static class MaxIntegerAggregator implements Aggregator<Integer,Integer> {
private int max = Integer.MIN_VALUE;
@Override
public void aggregate(Integer value) {
max = Math.max(max, value);
}
@Override
public void combine(Aggregator<Integer, Integer> other) {
max = Math.max(max, ((MaxIntegerAggregator) other).max);
}
@Override
public Integer result() {
return max;
}
}
public static class SumIntegerAggregator implements Aggregator<Integer,Integer> {
private int sum = 0;
@Override
public void aggregate(Integer value) {
sum += value;
}
@Override
public void combine(Aggregator<Integer, Integer> other) {
sum += ((SumIntegerAggregator)other).sum;
}
@Override
public Integer result() {
return sum;
}
}
@Override
protected Aggregator<Integer, Integer> initMin() {
return new MinIntegerAggregator();
}
@Override
protected Aggregator<Integer, Integer> initMax() {
return new MaxIntegerAggregator();
}
@Override
protected Aggregator<Integer, Integer> initSum() {
return new SumIntegerAggregator();
}
@Override
protected boolean isNan(Integer number) {
// NaN never applies here because only types like Float and Double have NaN
return false;
}
@Override
protected boolean isInfinite(Integer number) {
// Infinity never applies here because only types like Float and Double have Infinity
return false;
}
}