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.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* @author Andrei Ivanov
*/
public class AverageBelowFunction extends DistheneFunction {
public AverageBelowFunction(String text) {
super(text, "averageBelow");
}
@Override
public List<TimeSeries> evaluate(TargetEvaluator evaluator) throws EvaluationException {
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();
}
double threshold = (Double) arguments.get(1);
List<TimeSeries> result = new ArrayList<>();
for(TimeSeries ts : processedArguments) {
Double average = CollectionUtils.average(Arrays.asList(ts.getValues()));
if (average != null && average < threshold) {
result.add(ts);
}
}
return result;
}
@Override
public void checkArguments() throws InvalidArgumentException {
if (arguments.size() != 2) throw new InvalidArgumentException("averageBelow: number of arguments is " + arguments.size() + ". Must be one.");
if (!(arguments.get(0) instanceof Target)) throw new InvalidArgumentException("averageBelow: argument is " + arguments.get(0).getClass().getName() + ". Must be series");
if (!(arguments.get(1) instanceof Double)) throw new InvalidArgumentException("averageBelow: argument is " + arguments.get(1).getClass().getName() + ". Must be a number");
}
}