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[jsr363-experts] Re: Quantity.doubleValue(...) ?
- From: Martin Desruisseaux <
>
- To:
- Subject: [jsr363-experts] Re: Quantity.doubleValue(...) ?
- Date: Tue, 16 Dec 2014 00:08:44 +0900
- Organization: Geomatys
Le 15/12/14 22:03, Werner Keil a écrit :
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(...snip...) The concept of base units exists no matter how we
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represent it. Whether a particular implementation decides to
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define a BaseUnit class for holding that concept or not is an
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implementation details.
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As there are so many possible systems (custom implementations like
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"Health" or "Fitness" or country-specific ones, what should they all
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return there?
They would return their own set of base units, which are different than
the SI ones.
Base units is at the very core of the whole JSR-363 project, even if
there is no explicit BaseUnit type (because this is not necessary): all
SystemOfUnits is defined by a small set of base units, from which other
units are derived.
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(...snip...) it is not impossible to pull the Measurement interface
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into the API if found appropriate.
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Last time it was discussed, it seems most who participated felt it
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should be in the RI.
But I do *not* want to pull the Measurement interface into the API! It
is too problematic to define its right position in a hierarchy of
classes. But we do not need to have a Measurement interface in order to
talk about measurement! Repeating what I said in my previous email: we
do not need to have an Accuracy interface in order to talk about accuracy!
Martin