package edu.uci.ics.hivesterix.runtime.factory.hashfunction;

import edu.uci.ics.hivesterix.serde.lazy.LazyUtils;
import edu.uci.ics.hivesterix.serde.lazy.LazyUtils.VLong;
import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunction;
import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;

public class HiveLongBinaryHashFunctionFactory implements IBinaryHashFunctionFactory {
    private static final long serialVersionUID = 1L;

    public static IBinaryHashFunctionFactory INSTANCE = new HiveLongBinaryHashFunctionFactory();

    private HiveLongBinaryHashFunctionFactory() {
    }

    @Override
    public IBinaryHashFunction createBinaryHashFunction() {

        return new IBinaryHashFunction() {
            private VLong value = new VLong();

            @Override
            public int hash(byte[] bytes, int offset, int length) {
                LazyUtils.readVLong(bytes, offset, value);
                return (int) value.value;
            }
        };
    }

}