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With inspiration from other libraries

There is a newer version: 2.12.15

package io.virtdata.libbasics.shared.from_long.to_byte;

import io.virtdata.annotations.Categories;
import io.virtdata.annotations.Category;
import io.virtdata.annotations.ThreadSafeMapper;

import java.util.function.LongFunction;

/**
 * Return a byte value as the result of modulo division with the specified divisor.
 */
@ThreadSafeMapper
@Categories({Category.conversion})
public class ModuloToByte implements LongFunction {

    private final long modulo;

    public ModuloToByte(long modulo) {
        this.modulo = modulo;
    }

    @Override
    public Byte apply(long value) {
        return (byte) ((value % modulo) % Byte.MAX_VALUE);
    }
}