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.TimeSeriesUtils;
import java.util.ArrayList;
import java.util.List;
/**
* @author Andrei Ivanov
*/
public class PerSecondFunction extends DistheneFunction {
public PerSecondFunction(String text) {
super(text, "perSecond");
}
//todo: this implementation comes from graphite, but it doesn't seem right. Why cut at zero??
@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 maxValue = arguments.size() > 1 ? (Double) arguments.get(1) : null;
int length = processedArguments.get(0).getValues().length;
for (TimeSeries ts : processedArguments) {
Double[] values = new Double[length];
Double previous = null;
for (int i = 0; i < length; i++) {
if (previous != null && ts.getValues()[i] != null && (ts.getValues()[i] - previous > 0)) {
values[i] = (ts.getValues()[i] - previous) / ts.getStep();
} else if (previous != null && ts.getValues()[i]!= null && maxValue != null && maxValue >= ts.getValues()[i]) {
values[i] = (maxValue - previous + ts.getValues()[i] + 1) / ts.getStep();
}
previous = ts.getValues()[i];
}
ts.setValues(values);
if (maxValue != null) {
ts.setName("perSecond(" + ts.getName() + "," + maxValue + ")");
} else {
setResultingName(ts);
}
}
return processedArguments;
}
@Override
public void checkArguments() throws InvalidArgumentException {
if (arguments.size() > 2 || arguments.size() < 1) throw new InvalidArgumentException("perSecond: number of arguments is " + arguments.size() + ". Must be two.");
if (!(arguments.get(0) instanceof Target)) throw new InvalidArgumentException("perSecond: argument is " + arguments.get(0).getClass().getName() + ". Must be series");
if (arguments.size()> 1 && !(arguments.get(1) instanceof Double)) throw new InvalidArgumentException("perSecond: argument is " + arguments.get(1).getClass().getName() + ". Must be a number");
}
}