Part 3 OCL: Derivation properties
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   An introduction to OCL - the Object Constraint Language - through an example. This session also introduces the new MDriven Debugger
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   and shows how to get instant results from modeling efforts. Learn more about percentages and other useful properties to operate
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   and moderate your model properly.
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An introduction to OCL - the object constraints language - by example. The session also introduce the new MDriven debugger and shows how to get instant results of modelling efforts. Learn more about percentage and other useful properties to operate and moderate your model properly.


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     <span data-video="di3GScdWBxA" data-start="180" tabindex="0"> derivation properties </span>
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     <span data-video="di3GScdWBxA" data-start="41" tabindex="0"> percentage property </span>
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     <span data-video="di3GScdWBxA" data-start="300" tabindex="0"> calculation in oc </span>
     <span class="navigation-item" data-video="QaQu0ojg-Oc" data-start="180" tabindex="0"> Derivation Properties </span>
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     <span class="navigation-item" data-video="QaQu0ojg-Oc" data-start="41" tabindex="0"> Percentage property </span>
     <span data-video="di3GScdWBxA" data-start="250" tabindex="0"> random operator </span>
     <span class="navigation-item" data-video="QaQu0ojg-Oc" data-start="300" tabindex="0"> Calculation in OCL </span>
     <span data-video="di3GScdWBxA" data-start="690" tabindex="0"> toDecimal operation </span>
     <span class="navigation-item" data-video="QaQu0ojg-Oc" data-start="250" tabindex="0"> Random operator </span>
     <span class="navigation-item" data-video="QaQu0ojg-Oc" data-start="690" tabindex="0"> toDecimal operation </span>
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[[Category:OCL]]
'''Raw subtitles text'''
[[Category:OCL Editor]]
 
[[Category:Derivations]]
Hi welcome back to Part3 of Ocl
[[Category:Expressions]]
 
[[Category:Operators]]
let's say someone changes the requirements
{{Edited|July|12|2024}}
 
all of a sudden, the fruit can be in
 
multiple bowls, so I should have changed
 
the cardinality of the inbowl
 
property, but then we need to add a
 
Association object and association class
 
called fruit part in this case
 
I also add a percentage property on it,
 
so I know how much of the fruit that's in
 
the fruit bowl and all of a sudden,
 
we have quite different problem
 
we need to be able to calculate depending on
 
how much of the total fruits that's
 
in the fruit bowl, so fruit.allinstances
 
but we also have the link end
 
so if we watched the innerlink name
 
so these are the names to the fruit part in the association
 
so we find that fruit part
 
so fruit.allinstances and fruit part the
 
percentage, so if we select this you
 
should see, ok,okay I have the fruit allinstances
 
but since I changed the model
 
so all the data I had before is gone
 
so I need to update it
 
ok let's add a new attribute, so that we
 
know how much of the fruit is in  bowls
 
since the fruit is one fruit hundred
 
percent it shouldn't be more than a hundred
 
so we have the fruit parts that
 
this fruit takes part in and the
 
percentage of that and we sum that together
 
yeah we need to reload the model had
 
some changes, saving those okay then
 
I want to, the fruit I want to assign a
 
value to the percentage one just use a
 
random value to get some spreading my
 
data, so this is issuing the ocl editor
 
tend to the percentage int32.random
 
there should be random operator
 
the max value is a hundred so anything
 
between 0 and a hundred, execute that on
 
this glass bowl, okay and on the plastic bowl
 
oh I add semicolon too much
 
ok so now we have some random value in
 
the percentage in the fruit part now
 
we can make some use in the derivation of
 
the weight of the contents of the fruit bowl
 
because this is currently not
 
correct just summing up the weight of the fruits
 
we need to consider the part
 
of the fruits that that we use
 
so we iterate over fruit part the percentage
 
then we divide that by hundred to get a
 
fraction and we multiply it with now we
 
can follow the single link back to fruitInBowl
 
and get the weight of the
 
of the whole fruit
 
and we need to sum that up but that
 
would be a double and we need an int 32
 
so we need first to convert it to a
 
decimal, because that's the highest
 
position and then we can take it to int32 like that
 
ok so now we fix that one
 
let's see how much is in the bowls
 
so are there any bowls that
 
oh I should use two errors in
 
this expression is no one meant I meant
 
first of all this is spelled like wrong
 
but what the type is, ok that's the error it was fruit bowl
 
should have been fruit
 
okay how much is using bowls, if its
 
larger than a hundred then that fruit is overused
 
so we could warn about this in
 
our application of course, now I have the weight of the
 
contents as actually and considering the
 
the percentage of the fruit that's in
 
there the bowl, let's see what's this then
 
adding a new derived attribute and
 
presentation and grab the type name
 
from the fruit that's in the single link
 
fruit bowl, that's not like that with
 
weight of and same thing here back to
 
the single link fruitInBowl weight
 
but we want to multiply it by our percentage
 
how much did we use
 
ok let's do this, we calculate the actual weight
 
in separate drived attribute
 
fruit inbowl, weight, times percentage
 
devided by hundred,  to decimal, we need to go to decimal
 
because there's the conversion
 
to int32 is from decimal, ok it's the actual
 
weight now we have that and we can head back
 
yeah we have an error in
 
this expression presentation expression
 
because you can't just add int32 to a
 
string, we need to make it ok
 
and back to the debugger, re-read the model
 
check the fruit bowl hasn't change
 
that's because we haven't actually made
 
use of your presentation on the
 
fruit part, we're going to need to have
 
back to fruit bowl, in this one fruitinbowl presentation
 
that's not correct we should use the
 
fruit part of that, but we need to say
 
self in front of it, like so
 
reloading the model, now we can see that
 
we have detailed information about
 
what we actually have in the bowl and since
 
the weight of the contents now actually
 
is calculated in the fruit part for each
 
and the weight of each part is
 
calculated we might as well just sum
 
those up to reduced the need for definition
 
and like that doesn't change anything so
 
these are some examples on how you can
 
use ocl to navigate your data to
 
calculate your data to derive data
 
new information from your existing data and
 
there's loads of applications for
 
this and following these rules you can
 
actually complete the whole software
 
system only with business rules
 
expressed in icl, so hopefully
 
ypu will check out some of our other videos to
 
learn more about that, thank you for watching this Ocl introduction

Latest revision as of 15:44, 10 February 2024

An introduction to OCL - the Object Constraint Language - through an example. This session also introduces the new MDriven Debugger and shows how to get instant results from modeling efforts. Learn more about percentages and other useful properties to operate and moderate your model properly.

To make your experience smooth, we set the main tags mentioned in the video to the right bar menu of this mini-player. Choose an interesting subtitle on the list and immediately get to the exact theme navigation item place in the video. Now you can pick any topic to be instructed on without watching the whole video.


Derivation Properties Percentage property Calculation in OCL Random operator toDecimal operation

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