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Building a Map Dynamically [message #1566016]

Thu, 15 January 2015 16:23

Ronan B

Messages: 273
Registered: July 2009

Senior Member

Hi,
I want to build a Map dynamically from within a helper def. This Map will help later in the transformation rules for mapping local namespace prefixes to non-local namespace prefixes. It seems very difficult to build a map dynamically in ATL.

I started as follows:

helper def : prefixMap : Map(String,String) = MM1!X.allInstances()->select(e|MM1!Y.allInstances()->exists(f|f.name=e.name))->collect(e|Map{(e.name,MM1!Y.allInstances()->select(f|f.name=e.name)->first().prefix.name)});

or put simpler to show the issue:
helper def : prefixMap : Map(String,String) = MM1!X.allInstances()->collect(e|Map{(e.name,e.name)});

but this results in a Sequence containing a nested Map for each entry. I want a single Map containing pairs of namespace prefixes for each entry e.g. Sequence {Map{(a, az), (b, bz)}}

Thanks,
Ronan

[Updated on: Thu, 15 January 2015 16:23]

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Re: Building a Map Dynamically [message #1574982 is a reply to message #1566016]

Tue, 20 January 2015 15:03

Dennis Wagelaar

Messages: 589
Registered: September 2012
Location: Belgium

Senior Member

Use iterate() with Map::including(), e.g.:

--- Returns the existing EMRS!AbstractUser for the given INSS.
helper def : existingUsersByINSS : Map(String,EMRS!AbstractUser) =
	thisModule.existingUsersWithPersons->iterate(u; acc : Map(String,EMRS!AbstractUser) = Map{} |
		if u.person.inss.oclIsUndefined() or u.person.inss.isEmpty() then
			acc
		else
			acc->including(u.person.inss, u)
		endif
	);

Cheers,
Dennis

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