package net.iponweb.disthene.reader.graphite.functions;
import net.iponweb.disthene.reader.beans.TimeSeries;
import net.iponweb.disthene.reader.exceptions.EvaluationException;
import net.iponweb.disthene.reader.exceptions.InvalidArgumentException;
import net.iponweb.disthene.reader.exceptions.TimeSeriesNotAlignedException;
import net.iponweb.disthene.reader.graphite.Target;
import net.iponweb.disthene.reader.graphite.evaluation.TargetEvaluator;
import net.iponweb.disthene.reader.utils.CollectionUtils;
import net.iponweb.disthene.reader.utils.TimeSeriesUtils;
import java.util.*;
/**
* @author Andrei Ivanov
*/
public class HighestMaxFunction extends DistheneFunction {
public HighestMaxFunction(String text) {
super(text, "highestMax");
}
@Override
public List<TimeSeries> evaluate(TargetEvaluator evaluator) throws EvaluationException {
int number = ((Double) arguments.get(1)).intValue();
if (number <= 0) return Collections.emptyList();
List<TimeSeries> processedArguments = new ArrayList<>();
processedArguments.addAll(evaluator.eval((Target) arguments.get(0)));
if (processedArguments.size() == 0) return new ArrayList<>();
if (!TimeSeriesUtils.checkAlignment(processedArguments)) {
throw new TimeSeriesNotAlignedException();
}
SortedMap<Double, List<TimeSeries>> sorted = new TreeMap<>(Collections.reverseOrder());
for(TimeSeries ts : processedArguments) {
Double max = CollectionUtils.max(Arrays.asList(ts.getValues()));
if (max != null) {
if (sorted.get(max) == null) sorted.put(max, new ArrayList<TimeSeries>());
sorted.get(max).add(ts);
}
}
List<TimeSeries> result = new ArrayList<>();
for(Map.Entry<Double, List<TimeSeries>> entry : sorted.entrySet()) {
for (TimeSeries ts : entry.getValue()) {
result.add(ts);
}
if (result.size() >= number) break;
}
return result.subList(0, Math.min(number, result.size()));
}
@Override
public void checkArguments() throws InvalidArgumentException {
if (arguments.size() != 2) throw new InvalidArgumentException("highestMax: number of arguments is " + arguments.size() + ". Must be one.");
if (!(arguments.get(0) instanceof Target)) throw new InvalidArgumentException("highestMax: argument is " + arguments.get(0).getClass().getName() + ". Must be series");
if (!(arguments.get(1) instanceof Double)) throw new InvalidArgumentException("highestMax: argument is " + arguments.get(1).getClass().getName() + ". Must be a number");
}
}