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collect equivalent for one element [message #1752332]

Sat, 21 January 2017 13:05

Eclipse User

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

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

[Updated on: Sat, 21 January 2017 13:06] by Moderator

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

Sat, 21 January 2017 14:01

Eclipse User

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

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

Sun, 22 January 2017 13:45

Eclipse User

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?

Re: collect equivalent for one element [message #1752348 is a reply to message #1752346]

Sun, 22 January 2017 14:12

Eclipse User

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

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

Mon, 23 January 2017 01:36

Eclipse User

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

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

Mon, 23 January 2017 04:24

Eclipse User

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

Re: collect equivalent for one element [message #1752440 is a reply to message #1752384]

Mon, 23 January 2017 13:51

Eclipse User

I get my answer in another site. thanks for your time.

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