public enum DataType {
    BYTE(byte.class, Byte.class),
    SHORT(short.class, Short.class),
    INTEGER(int.class, Integer.class),
    LONG(long.class, Long.class),
    CHARACTER(char.class, Character.class),
    FLOAT(float.class, Float.class),
    DOUBLE(double.class, Double.class),
    BOOLEAN(boolean.class, Boolean.class);

    private static final Map<Class<?>, DataType> CLASS_MAP = new HashMap<Class<?>, DataType>();
    private final Class<?> primitive;
    private final Class<?> reference;

    // Initialize map for quick class lookup
    static {
        for (DataType type : values()) {
            CLASS_MAP.put(type.primitive, type);
            CLASS_MAP.put(type.reference, type);
        }
    }
}