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<title>RE: [gme-users] OCL Question</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It makes more sense to loop through the
connections. However I am getting a Syntax error with the “meta::B”,
I am not sure what that defines.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>What is Meta::B ?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> Ryan<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
gme-users-bounces@list.isis.vanderbilt.edu [mailto:gme-users-bounces@list.isis.vanderbilt.edu]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Matthew J. Emerson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, August 02, 2006
11:15 AM<br>
<b><span style='font-weight:bold'>To:</span></b> gme-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [gme-users] OCL
Question</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>To keep with your example, you need to edit your definition
of dest:</span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Let dest =
self.connectedFCOs(“dst”)->theOnly().oclAsType(meta::WhateverTheTypeIs).DataType.trim()
in</span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>But I don’t recommend using theOnly because if one atom
connects to zero or more than one other</span></font> <font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>atoms it
returns undefined.</span></font> <font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>I also don’t think
you need to use trim(). For the metamodel fragment in the image, I would write
the constraint:</span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>self.connectedFCOs(meta::Conn)->forAll(other : meta::B |
self.DataType = other.DataType)</span></font><o:p></o:p></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>The context of the constraint is the</span></font> <font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>‘A’ type. Flag the constraint to be checked on connect.</span></font><o:p></o:p></p>
<p><b><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
font-weight:bold'>From:</span></font></b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>
gme-users-bounces@list.isis.vanderbilt.edu [<a
href="mailto:gme-users-bounces@list.isis.vanderbilt.edu">mailto:gme-users-bounces@list.isis.vanderbilt.edu</a>]</span></font><b><span
style='font-weight:bold'> </span></b><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>On Behalf Of</span></font></b>
<st1:PersonName w:st="on"><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Raub, Ryan W</span></font></st1:PersonName><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> (FMSCOE)<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, August 01, 2006
4:42 PM<br>
<b><span style='font-weight:bold'>To:</span></b> gme-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> [gme-users] OCL Question</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
am trying to write a constraint to compare a common attribute on two atoms that
are connected, to allow or disallow the connection.</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
have not been able to access the 2<sup>nd</sup> connecting atom’s
attribute. The source atom can be referred to as “self”, but
I can not find any method combination that leads me to the destination
atom. </span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>So
far this is what I have:</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>--
DataType is the name of the string attribute I wish to compare on both SRC and
DST atoms. </span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>let
dest = self.connectedFCOs("dst")->theOnly() in </span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>let
src = self.DataType.trim() in</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>dest
= src</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks,</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
Ryan</span></font> <o:p></o:p></p>
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