OCL Collection Operators
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See also: https://wiki.mdriven.net/index.php/OCLOperators

Revision as of 07:40, 26 April 2023

This page was created by Stephanie@mdriven.net on 2023-04-12. Last edited by Stephanie@mdriven.net on 2025-03-10.

Once you have a collection of objects, there are certain operators applicable to them.

See this page for examples on collection operators.

Again, you can use the OCL-Editor to see what they are:

Collection of objects operators.png

Operators Description
->append Add another object last
->asBag Returns a Bag containing all elements of self.
->asSequence Returns a Sequence containing all elements of self. Element ordering is preserved when possible.
->asSet Returns a Set containing all elements of self.
->at Get the objects at X where the first index is 1
->at0 Get the objects at X where the first index is 0
->collect Returns a collection containing the result of applying expr on all elements contained in self.
->count Count how many meet a certain criteria
->dictionary Efficiently looks up values
->difference The difference between 2 collections
->excluding The collection except for this single object
->exists Returns true if at least one element in self validates the condition expr, false otherwise.
->filterOnType Only keep the ones of a certain type
->first Return the first object
->forAll Returns true if all the elements contained in self validate the condition expr, false otherwise.
->groupBy Build a collection of tuples grouped by some aspect
->includes Does the collection include the object
->includesAll Does the collection include the whole other collection
->including Returns the list with the element in the parameter included.
->IndexOf The 1 based index of an object in the collection possibly -1 if not existing
->indexOf0 The 0 based index of an object in the collection possibly -1 if not existing
->intersection The intersection of two collections
->isEmpty Returns true if the collection is empty
->notEmpty Returns true if self contains at least one element, false otherwise.
->reject Returns a collection with all elements of self except for those who validate the OclExpression expr.
->select Returns a collection with all elements of self that validate the OclExpression expr.
->size Returns the number of elements contained in self.
->sum Returns the sum of all elements contained in self if they support the '+' operation.
->last Returns the last object in the collection
->orderBy Sorts the collection on one or more properties
->orderDescending Sort the from biggest to smallest
->orderGeneric Sorts the list of properties with interchangeable sort order: (expr1, OclSortDirection::ascending, expr2, OclSortDirection::descending...)
->prepend Returns an OrderedSet containing object followed by all elements of self.
->subsequence Returns a smaller collection from a start to stop
->symmetricDifference The symmetric difference between the collections; ie all the objects in collection1 or collection2 but not in both
->union The set of objects in collection1 and objects in collection2

See also: https://wiki.mdriven.net/index.php/OCLOperators

Pages in category "OCL Collection Operators"

The following 41 pages are in this category, out of 41 total.

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