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/*
* Copyright (C) 2021 Samsung Electronics
* Licensed 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.onap.rapp.sleepingcelldetector.service.scd;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.List;
import java.util.Objects;
import java.util.OptionalDouble;
import java.util.stream.Collectors;
public class CalculationUtil {
private static final Logger logger = LoggerFactory.getLogger(CalculationUtil .class);
public static final int MIN_PERCENTAGE_OF_DATA_FILLING = 30;
private CalculationUtil(){
}
public static Integer calculateAverage(List<Integer> values){
OptionalDouble average = values.stream().mapToDouble(l -> l).average();
if (average.isPresent()) {
return (int) average.getAsDouble();
} else {
throw new ArithmeticException("Can't calculate average");
}
}
public static List<Integer> fillGaps(List<Integer> values){
verifyDataFilling(values);
Integer average = calculateAverage(values.stream().filter(Objects::nonNull).collect(Collectors.toList()));
for (int i=0; i<values.size(); i++){
if(values.get(i) == null){
values.set(i, average);
}
}
return values;
}
public static void verifyDataFilling(List<Integer> values) {
double measurementsNumber = values.stream().filter(Objects::nonNull).count();
double listSize = values.size();
double dataFillingPercentage = measurementsNumber/listSize * 100;
if (dataFillingPercentage < MIN_PERCENTAGE_OF_DATA_FILLING){
logger.warn("Not enough data to make prediction, must be at least 30%; Data filling: {}%", dataFillingPercentage);
throw new ArithmeticException("Not enough performance data for prediction, data filling: " + dataFillingPercentage + "%");
}
}
}
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