We don't have any multiplication, division or ratio operations at
present. While I can understand the use case below, I'm not sure that it
is generic enough to form part of Joda-Time itself. Any other views on this?
Stephen
Jim Leask wrote:
I am doing some time calculations on Durations that involve ratios -
basically floating point multiplication operations on Durations an
Intervals.
For example, I have an event with a start/end time (an Interval) and
another event (DateTime) that happened in the middle. I can easily
calculate the Duration of the original event, then from that figure
out the ratio of where the other event happened in the middle.
However, I need to do lots of messing around with millisecond
operations, and converting to/from long and float.
Is there an easier way? It would help quite a bit if the Duration
class had a 'mult' operator.
I'd like to be able to do something like the following:
Duration durationStartToFinish = new Duration( startDateTime,
endDateTime );
Duration durationStartToMiddle = new Duration (startDateTime,
middleDateTime);
float ratio = durationStartToMiddle .divide( durationStartToFinish );
then later....
Interval otherInterval = new Interval( otherStartDateTime,
otherFinishDateTime );
DateTime middleTime = otherInterval.mult( ratio );
or
Duration otherDurationFromStart = otherInterval.toDuration().mult
( ratio );
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