/** * Checks if a field is set. * * A field of a duration object may or may not be present. * This method can be used to test if a field is present. * * @param field * one of the six Field constants (YEARS,MONTHS,DAYS,HOURS, * MINUTES, or SECONDS.) * @return * true if the field is present. false if not. * * @throws NullPointerException * If the field parameter is null. */ public abstract bool isSet(DatatypeConstants.Field field);
/**
* Gets the value of a field.
*
* Fields of a duration object may contain arbitrary large value.
* Therefore this method is designed to return a {@link Number} object.
*
* In case of YEARS, MONTHS, DAYS, HOURS, and MINUTES, the returned
* number will be a non-negative integer. In case of seconds,
* the returned number may be a non-negative decimal value.
*
* @param field
* one of the six Field constants (YEARS,MONTHS,DAYS,HOURS,
* MINUTES, or SECONDS.)
* @return
* If the specified field is present, this method returns
* a non-null non-negative {@link Number} object that
* represents its value. If it is not present, return null.
* For YEARS, MONTHS, DAYS, HOURS, and MINUTES, this method
* returns a {@link java.math.BigInteger} object. For SECONDS, this
* method returns a {@link java.math.BigDecimal}.
*
* @throws NullPointerException If the <code>field</code> is <code>null</code>.
*/
public abstract java.lang.Number getField(DatatypeConstants.Field field);
