/**
* Gets a copy of this Partial with the specified period added.
*
* <p>If the addition is zero, then <code>this</code> is returned. Fields in the period that
* aren't present in the partial are ignored.
*
* <p>This method is typically used to add multiple copies of complex period instances. Adding one
* field is best achieved using the method {@link #withFieldAdded(DurationFieldType, int)}.
*
* @param period the period to add to this one, null means zero
* @param scalar the amount of times to add, such as -1 to subtract once
* @return a copy of this instance with the period added
* @throws ArithmeticException if the new datetime exceeds the capacity
*/
public Partial withPeriodAdded(ReadablePeriod period, int scalar) {
if (period == null || scalar == 0) {
return this;
}
int[] newValues = getValues();
for (int i = 0; i < period.size(); i++) {
DurationFieldType fieldType = period.getFieldType(i);
int index = indexOf(fieldType);
if (index >= 0) {
newValues =
getField(index)
.add(this, index, newValues, FieldUtils.safeMultiply(period.getValue(i), scalar));
}
}
return new Partial(this, newValues);
}
/**
* Gets the indexed field part of the period.
*
* @param period the period to query
* @param index the index to use
* @return the value of the field, zero if unsupported
*/
int getIndexedField(ReadablePeriod period, int index) {
int realIndex = iIndices[index];
return (realIndex == -1 ? 0 : period.getValue(realIndex));
}
