/** Creates new Staff from the parentInput's input stream.
* The next object in the input stream must be of this type.
* This also reads all the enclosed MeasureStartTimeSlice objects
* which themselves contain the event TimeSlice and MusicSymbol objects.
*
* @param parentInput the parent RIFF object being used to read the input stream
*/
public static Staff newInstance(Riff parentInput)
{
Riff riffInput = new Riff(parentInput, "LIST");
riffInput.requireFOURCC(RIFF_ID);
Staff staff = new Staff(RiffStaffHeader.newInstance(riffInput));
if (riffInput.getBytesRemaining() <= 0)
// the staff is empty
return staff;
MeasureStartTimeSlice measureStart =
RiffMeasureStartTimeSlice.maybeNew(riffInput);
if (measureStart == null) {
// For some reason, the first chunk in this staff is not a
// measure start time slice. Create a fake one based
// on the previous staff system's end time
// DEBUG: must implement this! For now use start time of 0/1
measureStart = new MeasureStartTimeSlice(new Rational(0, 1), null);
}
while (true) {
if (staff.getMeasureStartCount() > 0 &&
staff.getMeasureStart
(staff.getMeasureStartCount() - 1).getStartTime().Equals
(measureStart.getStartTime()))
// This new measure start time is the same as the last one,
// so just continue using the last one.
// DEBUG: this still doesn't ensure increasing order
// DEBUG: This discards the tags in the newly read measure start
measureStart =
staff.getMeasureStart(staff.getMeasureStartCount() - 1);
else
staff.addMeasureStart(measureStart);
// Read event time slices until the next measure start time slice or
// end of the staff
RiffMeasureStartTimeSlice.addTimeSlices(riffInput, measureStart);
if (riffInput.getBytesRemaining() <= 0)
// reached the end of the staff
break;
// The previous call to readTimeSlices has already
// ensured that the next chunk is a measure start time slice.
measureStart = RiffMeasureStartTimeSlice.newInstance(riffInput);
}
return staff;
}
/** Add the given staff to the Staff list.
* This does not call invalidate(), but you may need to before displaying.
*
* @param staff the Staff to add. It is an error if
* this is already the child of an object.
* @throws HeirarchyException if the staff has already
* been added as a child to another object.
* @see #invalidate
*/
public void addStaff(Staff staff)
{
addChild(staff);
}
