io.split.client.impressions.ImpressionHasher Maven / Gradle / Ivy

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package io.split.client.impressions;

import io.split.client.utils.MurmurHash3;

public class ImpressionHasher {

    private static final String HASHABLE_FORMAT = "%s:%s:%s:%s:%d";
    private static final String UNKNOWN = "UNKNOWN";

    private static String unknownIfNull(String s) {
        return (s == null) ? UNKNOWN : s;
    }

    private static Long zeroIfNull(Long l) {
        return (l == null) ? 0 : l;
    }

    public static Long process(Impression impression) {
        if (null == impression) {
            return null;
        }
        return MurmurHash3.hash128x64(String.format(HASHABLE_FORMAT,
                unknownIfNull(impression.key()),
                unknownIfNull(impression.split()),
                unknownIfNull(impression.treatment()),
                unknownIfNull(impression.appliedRule()),
                zeroIfNull(impression.changeNumber())).getBytes())[0];
    }
}