net.acesinc.data.binner.MergedBinner Maven / Gradle / Ivy

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package net.acesinc.data.binner;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author andrewserff
 */
public class MergedBinner extends Binner {

    private List binners;

    public MergedBinner(List binners) {
        super(null);
        this.binners = binners;
    }

    @Override
    public List generateBinNames(Object data) {
        //generate all the binners bins
        List> generatedBins = new ArrayList<>();

        binners.stream().map((b) -> {
            if (b.getGeneratedBinNames() == null) {
                b.generateBinNames(data);
            }
            return b;
        }).forEach((b) -> {
            generatedBins.add(b.getGeneratedBinNames());
        });

        //then merge those bins in the order the binners were specified
        List binNames = new ArrayList<>();
        List startingBins = generatedBins.get(0);

        for (List bins : generatedBins.subList(1, generatedBins.size())) {
            List newBins = new ArrayList<>();
            if (bins != null) {
                for (String bin : bins) {
                    for (String prefix : startingBins) {
                        newBins.add(prefix + "." + bin);
                    }
                }
            }
            binNames.addAll(newBins);
            startingBins = binNames;
        }

        return binNames;
    }

    @Override
    protected List generateBinNamesForData(Object value) {
        //this is unused for this Binner
        return null;
    }

}