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collect equivalent for one element [message #1752332]

Sat, 21 January 2017 18:05

Banafsheh Azizi

Messages: 328
Registered: July 2016

Senior Member

I am new in OCL. How can I write OCL expression below for one element?

s.source.elements -> collect (s|thisModule.CreateMatchClass(s))

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http://mdse.ui.ac.ir

[Updated on: Sat, 21 January 2017 18:06]

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Re: collect equivalent for one element [message #1752333 is a reply to message #1752332]

Sat, 21 January 2017 19:01

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

I have no idea, since I cannot understand your question.

Once you learn to express your intended computation in a clear (declarative) way you will find that transliteration into OCL is quite straightforward. Practice your exposition.

Regards

Ed Willink

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Re: collect equivalent for one element [message #1752346 is a reply to message #1752333]

Sun, 22 January 2017 18:45

Banafsheh Azizi

Messages: 328
Registered: July 2016

Senior Member

In other words, I don't understand which elements does the above code collect?
Since "collect" is used when we have more than one element, if I have one element (instead of elements), what changes occure to "-> collect (s|thisModule.CreateMatchClass(s))" part of that expression?

Member of MDSE Research Group
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Re: collect equivalent for one element [message #1752348 is a reply to message #1752346]

Sun, 22 January 2017 19:12

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

collect is for multiple elements.

If you only have one element why would you want to collect all one of it? For comparison, if you have a Java loop counter, why would you declare it as "int[] i" rather than "int i", or why would you want to wrap a single calculation in a loop?

You need to express your intent clearly.

Regards

Ed Willink

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Re: collect equivalent for one element [message #1752371 is a reply to message #1752348]

Mon, 23 January 2017 06:36

Banafsheh Azizi

Messages: 328
Registered: July 2016

Senior Member

For one element is below code true?
s.source.thisModule.CreateMatchClass(s)

Member of MDSE Research Group
http://mdse.ui.ac.ir

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Re: collect equivalent for one element [message #1752384 is a reply to message #1752371]

Mon, 23 January 2017 09:24

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

No idea.

What is "s"?
What is "source"?
What is "thisModule"?
What is "CreateMatchClass"?

See https://wiki.eclipse.org/OCL/ForumNetiquette

Regards

Ed Willink

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