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Beginner OCLOperators

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General operators

To find all available you can open the OCL-Editor and type in a class:

Ocl-editor 1.png

Operators Description
allInstances All the objects of the class
allinstancesAtTime All the currently loaded instances
allLoadedObjects All objects currently in memory, exckluding deleted objects
allStates Meta information about available states in state machines the class may contain
allSubClasses Meta information on all the sub classes this class has
allSuperTypes Meta information on all the super classes – in inheritance order the class has
associationEnds Returns a collection of strings with association names for the class
associationEndsWithType Returns a collection of strings with association names and type information for the class
asString The string representation of the class – the asString operation is available on everything
asTaJson Returns a json string defined by the ViewModel
Attributes Meta information about what attributes the class has
brokenConstraints Returns a collection of the names of broken constraints for the class and object.
canAccess Check viewmodels Access expression for root
Contraints Meta information on what constraints the class has
count Returns how many times object is in the collection self.
emptylist Returns an empty list typed to hold objects of the class
externalId Returns the external ID for the object operated on.
IsNew IsNew operator returns true if the object has never been saved to the database.
maxValue Gets the maximum value in a collection of values
minValue Gets the minimum value in a collection of values
nullValue A typed null value
objectFromExternalId An external identity will be resolved to the object
oclAsType The type of the class
oclIsInvalid Returns true if self is equal to *invalid*.
oclIsKindOf This is to if a class is a subclass or a the class itself and not unrelated
oclIsTypeOf Returns true if
oclIsUndefined Returns true if self is equal to invalid or null.
sqlpassthrough Calls a stored procedure
sqlpassthroughobjects Return a primary key of SomeClass. This can be combined with other Ocl-PS via ->intersection or union.
superTypes Returns the set of all direct supertypes of the type.
TaggedValue Meta information on tagged values set in the class
TaggedValueOnFeature Meta information on Tagged values set on a named feature in the class
Typename The type name as a string
ViewModels A tuple with the ViewModels for this class a members

Collection operators

Once you have a collection of objects there are certain operators that are applicable to it.

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 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 the all the elements contained in self validate the condition expr, false otherwise.
->groupBy Build 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
->notEmpty Returns true of the collection is not empty
->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.
->reject Returns the objects not matching the criteria
->select Returns the objects matching the criteria
->size Returns the number of elements in the collection
->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

String operators

Operators Description
Escape codes Escape (special) characters used in OCL
StringToAnsiBase64 Convert a string to an ANSI (1252) and as a base64 string
StringToEncodedBase64 Convert a string to a specific encoding and as a base64 string. For example Western Eauropean (ISO) Codepage 28591
size () : Integer Returns the number of characters composing self.
subString Returns the substring of the string operated on. The substring starts at parameter 1 and ends at parameter 2. The counting is 1-based.
toInteger () : Integer Returns self with all characters converted to lowercase.
toLower () : String Returns self with all characters converted to lowercase.
toReal () : Real Returns a Real of value equal to self, or |invalid| if self does not represent a real.
toUpper () : String Returns self with all characters converted to uppercase.

Number operators

In addition to the basic math functions (+, -, /, \*) are a number of advanced functions. Take note that *Number* denotes both *Integer* and *Real*, and they're substitutive unless otherwise specified.

Operators Description
Number::abs () : Number Returns the absolute value of selfself if it is already a positive number.
Number::floor () : Integer Returns the integer part of self if it is a Real, self if it is an Integer.
Number::max ( r : Number ) : Number Returns the greatest number between self and *r*.
Number::min ( r : Number ) : Number Returns the lowest number between self and *r*.
Number::round () : Integer Returns the nearest integer to self if it is a Real, self if it is an Integer.
Number::ieeereminder(r:Number):Integer Reminder of division with r, ie modulus or mod or %
Integer::div ( i : Integer ) : Integer Returns the integer quotient of the division of self by *i*.
Integer::mod ( i : Integer ) : Integer Returns the integer remainder of the division of self by *i*.

Boolean operators

Operators Description

Viewmodel operators (on selfVM variable)

See page SelfVM