/**
* Checks if the specified field is supported.
*
* <p>This checks if this offset can be queried for the specified field. If false, then calling
* the {@link #range(TemporalField) range} and {@link #get(TemporalField) get} methods will throw
* an exception.
*
* <p>If the field is a {@link ChronoField} then the query is implemented here. The {@code
* OFFSET_SECONDS} field returns true. All other {@code ChronoField} instances will return false.
*
* <p>If the field is not a {@code ChronoField}, then the result of this method is obtained by
* invoking {@code TemporalField.isSupportedBy(TemporalAccessor)} passing {@code this} as the
* argument. Whether the field is supported is determined by the field.
*
* @param field the field to check, null returns false
* @return true if the field is supported on this offset, false if not
*/
@Override
public boolean isSupported(TemporalField field) {
if (field instanceof ChronoField) {
return field == OFFSET_SECONDS;
}
return field != null && field.isSupportedBy(this);
}
/**
* Gets the value of the specified field from this offset as a {@code long}.
*
* <p>This queries this offset for the value for the specified field. If it is not possible to
* return the value, because the field is not supported or for some other reason, an exception is
* thrown.
*
* <p>If the field is a {@link ChronoField} then the query is implemented here. The {@code
* OFFSET_SECONDS} field returns the value of the offset. All other {@code ChronoField} instances
* will throw an {@code UnsupportedTemporalTypeException}.
*
* <p>If the field is not a {@code ChronoField}, then the result of this method is obtained by
* invoking {@code TemporalField.getFrom(TemporalAccessor)} passing {@code this} as the argument.
* Whether the value can be obtained, and what the value represents, is determined by the field.
*
* @param field the field to get, not null
* @return the value for the field
* @throws DateTimeException if a value for the field cannot be obtained
* @throws UnsupportedTemporalTypeException if the field is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public long getLong(TemporalField field) {
if (field == OFFSET_SECONDS) {
return totalSeconds;
} else if (field instanceof ChronoField) {
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
return field.getFrom(this);
}
