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Home » Modeling » EMF "Technology" (Ecore Tools, EMFatic, etc)  » EDataType and '<' operation in OCL expression
EDataType and '<' operation in OCL expression [message #566104] Tue, 07 February 2006 17:07
Radomil Dvorak is currently offline Radomil DvorakFriend
Messages: 249
Registered: July 2009
Senior Member
Hi,

Is '<' operation defined for EDataType which points by
EDataType::instanceClass to a java class which
implements Comparable?
As mentioned in the thread 'order of returned items', the 'sortedBy'
operation on collections implemented by EMFT
understands the definition of '<' operation as implementation of
'java.lang.Comparable' interface.

It works for me in the following example with use of ecore::EDate:
This is the context classifier described in emfatic source.
class Topic {
attr String[1] name;
attr Date startDate;
attr Date endDate;
}

1) the following expression works fine and is evaluated by using
'java.util.Date.compareTo'.
Bag { startDate, endDate }->sortedBy(d|d)->last() = endDate

2) but the expression below fails with: "AnyType: the source of operation:
(lessThan) must be an EClass"
startDate < endDate

Am I wrong to expect that if '<' was found as defined in 'sortedBy' it
should be resolved also in the second expression?

Regards,
/Radek
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