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Acceleo/OCL Operations Reference

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OCL operation reference

Ocl operations for type *Classifier*

allInstances () : Set{T}

Returns a Set containing all of the existing instances of the current classifier (along with instances of all its inherited classifiers).

Expression Result
let a : String = 'a', b : String = 'b', c : Integer = 2 in String.allInstances() Set{'a','b'}


Ocl operations for type *OclAny*

oclAsType ( typespec : Classifier ) : T

Returns self statically typed as typespec if it is an instance of this type. *Note* that this does not alter the runtime value of self, it only enables access to subtype operations. This operation allows users to cast self to another type.

Expression Result
aPerson.oclAsType(Employee) an object of Employee type


oclIsInvalid () : Boolean

Returns true if self is equal to *invalid*.

Expression Result
let anObject : String = null in anObject.oclIsInvalid() false
let anObject : String = invalid in anObject.oclIsInvalid() true
let anObject : String = 'null' in anObject.oclIsInvalid() false

oclIsKindOf( Classifier typespec ) : Boolean

Returns true if the type of self corresponds to the type or supertype of typespec, false otherwise. This operation allows users to check the class hierarchy of self much like would an instanceof Java.

Expression Result
anEmployee.oclIsKindOf(Employee) true
anEmployee.oclIsKindOf(Person) true
aCat.oclIsKindOf(Person) false


oclIsTypeOf( typespec : Classifier ) : Boolean

Returns true if the type of self is the same as typespec, or false otherwise. This operation allows users to check the exact class type of self.

Expression Result
anEmployee.oclIsTypeOf(Employee) true
anEmployee.oclIsTypeOf(Person) false
aCat.oclIsTypeOf(Person) false

oclIsUndefined () : Boolean

Returns true if self is equal to invalid or null.

Expression Result
let anObject : String = null in anObject.oclIsUndefined() true
let anObject : String = invalid in anObject.oclIsUndefined() true
let anObject : String = 'null' in anObject.oclIsUndefined() false

<> ( object : OclAny ) : Boolean

Returns true if self is a different object from object.

Expression Result
let a : String = 'a', b : String = 'a' in a <> b false
let a : Integer = 2, b : Real = 2.0 in a <> b false
let a : Integer = -2, b : Integer = 2 in a <> b true


= ( object : OclAny) : Boolean

Returns true if self is equal to object.

Expression Result
let a : String = 'a', b : String = 'a' in a = b true
let a : Integer = 2, b : Real = 2.0 in a = b true
let a : Integer = -2, b : Integer = 2 in a = b false


< ( object : T ) : Boolean

Returns true if self is comparable to object and less than object.

Expression Result
let a : Integer = 1, b : Integer = 2 in a < b true
let a : Real = 1.5, b : Integer = 2 in a < b true
let a : String = 'Anteater', b : String = 'Aardvark' in a < b false


> ( object : T ) : Boolean

Returns true if self is comparable to object and greater than object.

Expression Result
let a : Integer = 1, b : Integer = 2 in a > b false
let a : Real = 1.5, b : Integer = 2 in a > b false
let a : String = 'Anteater', b : String = 'Aardvark' in a > b true


<= ( object : T ) : Boolean

Returns true if self is comparable to object and less than or equal to object.

Expression Result
let a : Integer = 1, b : Integer = 2 in a <= b true
let a : Real = 1.5, b : Integer = 2 in a <= b true
let a : String = 'Anteater', b : String = 'Aardvark' in a <= b false


>= ( object : T ) : Boolean

Returns true if self is comparable to object and greater than or equal to object.

Expression Result
let a : Integer = 1, b : Integer = 2 in a >= b false
let a : Real = 1.5, b : Integer = 2 in a >= b false
let a : String = 'Anteater', b : String = 'Aardvark' in a >= b true


Ocl operations for type *String*

    • A note on Strings** : OCL Strings begin at index *1*, not *0* as in most languages. Thus *'test'.at(0)* fails in
  • invalid* whereas *'test'.at(1)* yields *'t'*. Likewise, *'test'.substring(2, 2)* returns *'e'*.

concat ( s : String ) : String

Returns a string containing self followed by *s*.

Expression Result
'concat'.concat(' ').concat('operation') 'concat operation'


size () : Integer

Returns the number of characters composing self.

Expression Result
'size operation'.size() 14


substring ( lower : Integer, upper : Integer ) : String

Returns a string containing all characters from self starting from index *lower* up to index *upper* included. Both *lower* and *upper* parameters should be contained between *1* and *self.size()* included. *lower* cannot be greater than *upper*.

Expression Result
'substring operation'.substring(11, 19) 'operation'
'substring operation'.substring(1, 1) 's'
'substring operation'.substring(0, 1) invalid


toInteger () : Integer

Returns an Integer of value equal to self, or |invalid| if self does not represent an integer.

Expression Result
'3.0'.toInteger() invalid
'4'.toInteger() 4
'toInteger'.toInteger() invalid


toLower () : String

Returns self with all characters converted to lowercase.

Expression Result
'LoWeR OpErAtIoN'.toLower() 'lower operation'


toReal () : Real

Returns a Real of value equal to self, or |invalid| if self does not represent a real.

Expression Result
'3.0'.toReal() 3.0
'4'.toReal() 4.0
'toReal'.toReal() invalid


toUpper () : String

Returns self with all characters converted to uppercase.

Expression Result
'UpPeR OpErAtIoN'.toUpper() 'UPPER OPERATION'


Ocl operations for type *Number*

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.

Number::abs () : Number

Returns the absolute value of self, self if it is already a positive number.

Expression Result
(-2.3).abs() 2.3
-5.abs() 5


Number::floor () : Integer

Returns the integer part of self if it is a Real, self if it is an Integer.

Expression Result
(2.3).floor() 2
(2.8).floor() 2
2.floor() 2


Number::max ( r : Number ) : Number

Returns the greatest number between self and *r*.

Expression Result
6.max(3) 6
6.max(5.2) 6.0
(2.3).max(3) 3.0
(2.3).max(5.2) 5.2


Number::min ( r : Number ) : Number

Returns the lowest number between self and *r*.

Expression Result
6.min(3) 3
6.min(5.2) 5.2
(2.3).min(3) 2.3
(2.3).min(5.2) 2.3


Number::round () : Integer

Returns the nearest integer to self if it is a Real, self if it is an Integer.

Expression Result
(2.3).round() 2
(2.5).round() 3
(2.8).round() 3
2.round() 2


Integer::div ( i : Integer ) : Integer

Returns the integer quotient of the division of self by *i*.

Expression Result
3.div(2) 1
11.div(3) 3


Integer::mod ( i : Integer ) : Integer

Returns the integer remainder of the division of self by *i*.

Expression Result
3.mod(2) 1
11.mod(3) 2


Ocl operations for type *Collection*

Please note that OCL collections can contain the *null* value (null) but not the *invalid* value (|invalid|). Trying to add |invalid| within a new or existing collection will yield |invalid| as a result. OCL proposes four distinct kinds of collections offering all possibilities of ordering/unicity.


Collection type Ordered Unique
Sequence true false
OrderedSet true true
Bag false false
Set false true


any ( expr : OclExpression ) : T

Returns any element contained in self that validates the condition expr, null otherwise. Evaluation is shortcut as soon as an element validating expr is found. Note that the result of this on unordered collections will be random if more than one element validates expr.

Expression Result
Sequence{1.2, 2.3, 5.2, 0.9}->any(self < 1) 0.9
Sequence{1.2, 2.3, 5.2, 0.9}->any(self < 2) 1.2


asBag () : Bag(T)

Returns a Bag containing all elements of self.

Expression Result
Sequence{'3', 1, 2.0, '3'}->asBag() Bag{2.0, '3', 1, '3'}
Bag{1, 2.0, '3'}->asBag() Bag{2.0, 1, '3'}
OrderedSet{1, 2.0, '3'}->asBag() Bag{2.0, 1, '3'}
OrderedSet{1, 1, 2.0, '3'}->asBag() Bag{'3', 1, 2.0}
Set{1, 2.0, '3'}->asBag() Bag{2.0, 1, '3'}
Set{1, 1, 2.0, '3'}->asBag() Bag{2.0, '3', 1}


asOrderedSet () : OrderedSet(T)

Returns an OrderedSet containing all elements of self. Element ordering is preserved when possible.

Expression Result
Sequence{1, 2.0, '3'}->asOrderedSet() OrderedSet{1, '3', 2.0}
Sequence{1, 1, 2.0, '3'}->asOrderedSet() OrderedSet{'3', 1, 2.0}
Bag{1, 2.0, '3'}->asOrderedSet() OrderedSet{2.0, 1, '3'}
Bag{1, 1, 2.0, '3'}->asOrderedSet() OrderedSet{1, '3', 2.0}
OrderedSet{1, 2.0, '3'}->asOrderedSet() OrderedSet{1, 2.0, '3'}
Set{1, 2.0, '3'}->asOrderedSet() OrderedSet{'3', 1, 2.0}


asSequence () : Boolean

Returns a Sequence containing all elements of self. Element ordering is preserved when possible.

Expression Result
Sequence{1, 2.0, '3'}->asSequence() Sequence{1, 2.0, '3'}
Bag{1, 2.0, '3'}->asSequence() Sequence{2.0, 1, '3'}
OrderedSet{1, 2.0, '3'}->asSequence() Sequence{1, 2.0, '3'}
Set{1, 2.0, '3'}->asSequence() Sequence{'3', 1, 2.0}


asSet () : Set(T)

Returns a Set containing all elements of self.

Expression Result
Sequence{1, 2.0, '3'}->asSet() Set{1, '3', 2.0}
Sequence{1, 1, 2.0, '3'}->asSet() Set{'3', 1, 2.0}
Bag{1, 2.0, '3'}->asSet() Set{2.0, 1, '3'}
Bag{1, 1, 2.0, '3'}->asSet() Set{1, '3', 2.0}
OrderedSet{1, 2.0, '3'}->asSet() Set{1, '3', 2.0}
OrderedSet{1, 1, 2.0, '3'}->asSet() Set{'3', 1, 2.0}
Set{1, 2.0, '3'}->asSet() Set{2.0, 1, '3'}
Set{1, 1, 2.0, '3'}->asSet() Set{'3', 1, 2.0}


collect ( expr : OclExpression ) : Collection(T2)

Returns a collection containing the result of applying expr on all elements contained in self.

Expression Result
Sequence{'first', 'second'}->collect(toUpper()) Sequence{'FIRST', 'SECOND'}


collectNested ( expr : OclExpression ) : Collection(T2)

Returns a collection containing all the elements contained in self on which we applied the OclExpression expr. The results won't be flattened. The type of the resulting collection depends on the type of self.

For the purpose of these examples we'll assume here that we have a Class *Person* with a reference *children*. Our model contains two persons such as *person1.children = {James, Jane}* and *person2.children = {John}*.

Expression Result
self.persons->collectNested(children.firstname) Sequence{Sequence{James, Jane}, Sequence{John}}


count ( object : T ) : Integer

Returns how many times object is in the collection self.

Expression Result
Sequence{2.3, 5.2}->count(5.2) 1
Set{3, 'test', 4.0, 4, 4.0, 'test'}->count(null) 0
Set{3, null, 4.0, null, 'test'}->count(null) 1
Bag{3, null, 4.0, null, 'test'}->count(null) 2


excludes ( object : T ) : Boolean

Returns true if object is not contained in self, false otherwise.

Expression Result
Sequence{2.3}->excludes(2.1) true
Sequence{2.0}->excludes(2) false


excludesAll ( c2 : Collection(T) ) : Boolean

Returns true if no element of *c2* is contained in self, false otherwise.

Expression Result
Sequence{2.3, 5.2, 'a', 3, null}->excludesAll(Set{4, null}) false
Sequence{2.3, 5.2, 'a', 3}->excludesAll(Set{4, null}) true


excluding ( object : T ) : Collection(T)

Returns a collection containing all elements of self minus all occurences of object. **Note** : at the time of writing, the OCL standard library sports a bug which changes *OrderedSets* in *Sets* when excluding elements.

Expression Result
Sequence{'b', 'a', 'b', 'c'}->excluding('b') Sequence{'a', 'c'}
Bag{'b', 'a', 'b', 'c'}->excluding('b') Bag{'c', 'a'}
OrderedSet{'b', 'a', 'b', 'c'}->excluding('b') Set{'c', 'a'}
Set{'b', 'a', 'b', 'c'}->excluding('b') Set{'c', 'a'}


exists ( expr : OclExpression ) : Boolean

Returns true if at least one element in self validates the condition expr, false otherwise. The evaluation stops as soon as one element validating expr is found.

Expression Result
Sequence{2.3, 5.2}->exists(self > 3) true


flatten () : Collection(T2)

Returns a collection containing all elements of self recursively flattened. **Note** : at the time of writing, the OCL standard library sports a bug which changes *OrderedSets* in *Sets* when flattening.

Expression Result
Sequence{Set{1, 2, 3}, Sequence{2.0, 3.0}, Bag{'test'}}->flatten() Sequence{1, 2, 3, 2.0, 3.0, 'test'}
Bag{Set{Bag{'test', 2, 3.0}}, Sequence{OrderedSet{2.0, 3, 1}}}->flatten() Bag{1, 2, 3, 2.0, 3.0, 'test'}
OrderedSet{Set{Bag{'test', 2, 3.0}}, Sequence{Set{2.0, 3, 1}}}->flatten() Set{3.0, 2, 1, 3, 'test', 2.0}
Set{Set{Bag{'test', 2, 3.0}}, Sequence{OrderedSet{2.0, 3, 1}}}->flatten() Set{3.0, 2, 1, 3, 'test', 2.0}


forAll ( expr : OclExpression ) : Boolean

Returns true if the all the elements contained in self validate the condition expr, false otherwise.

Expression Result
Sequence{2.3, 5.2}->forAll(self > 3) false
Sequence{2.3, 5.2}->forAll(self > 1.2) true


includes ( object : T ) : Boolean

Returns true if object is contained in self, false otherwise.

Expression Result
Sequence{2.3}->includes(2.1) false
Sequence{2.0}->includes(2) true


includesAll ( c2 : Collection(T) ) : Boolean

Returns true if all element of *c2* are contained in self, false otherwise.

Expression Result
Sequence{2.3, 5.2, 'a', 3, null}->includesAll(Set{3, null}) true
Sequence{2.3, 5.2, 'a', 3}->includesAll(Set{3, null}) false


including ( object : T ) : Collection(T)

Returns a collection containing all elements of self followed by object. **Note** : at the time of writing, the OCL standard library sports a bug which changes *OrderedSets* in *Sets* when including elements.

Expression Result
Sequence{'a', 'b'}->including('c') Sequence{'a', 'b', 'c'}
Bag{'a', 'b'}->including('c') Bag{'a', 'c', 'b'}
OrderedSet{'a', 'b'}->including('c') Set{'a', 'c', 'b'}
Set{'a', 'b'}->including('c') Set{'a', 'c', 'b'}


isEmpty () : Boolean

Returns true if self is empty, false otherwise.

Expression Result
Sequence{2, 'a'}->isEmpty() false
Sequence{null}->isEmpty() false
Sequence{}->isEmpty() true


isUnique ( expr : OclExpression ) : Boolean

Returns true if all elements contained in self evaluate to a distinct value for expr.

Expression Result
Sequence{2.3, 5.2}->isUnique(self > 3) true
Sequence{2.3, 5.2}->isUnique(self > 1) false


notEmpty () : Boolean

Returns true if self contains at least one element, false otherwise.

Expression Result
Sequence{2, 'a'}->notEmpty() true
Sequence{null}->notEmpty() true
Sequence{}->notEmpty() false


one ( expr : OclExpression ) : Boolean

Returns true if there is only one element contained in self that validates the condition expr, false otherwise.

Expression Result
Sequence{1.2, 2.3, 5.2, 0.9}->one(self < 1) true
Sequence{1.2, 2.3, 5.2, 0.9}->one(self < 2) false


product ( c2 : Collection(T2) ) : Set(Tuple(first : T, second : T2))

Returns a Set of Tuples which represents the cartesian product of self with *c2*.

Expression Result
Sequence{3, 4}->product(Bag{3.0, 4.0}) Set{Tuple{3, 3.0}, Tuple{3, 4.0}, Tuple{4, 3.0}, Tuple{4, 4.0}}
Set{3, 4}->product(OrderedSet{3.0, 4.0}) Set{Tuple{3, 3.0}, Tuple{3, 4.0}, Tuple{4, 3.0}, Tuple{4, 4.0}}


reject ( expr : OclExpression ) : Collection(T)

Returns a collection with all elements of self except for those who validate the OclExpression expr.

Expression Result
i > 1 ) Sequence{1}
i > 1 ) Bag{1}
i > 1 ) OrderedSet{1}
i > 1 ) Set{1}


select ( expr : OclExpression ) : Collection(T)

Returns a collection with all elements of self that validate the OclExpression expr.

Expression Result
i > 1) Sequence{2, 3}
i > 1 ) Bag{3, 2}
i > 1 ) OrderedSet{2, 3}
i > 1 ) Set{3, 2}


size () : Integer

Returns the number of elements contained in self.

Expression Result
Sequence{2.3, 5}->size() 2
Sequence{}->size() 0


sortedBy ( expr : OclExpression ) : Sequence(T)

Returns a sorted collection containing all elements from self sorted in accordance with the OclExpression expr. This can be used on all kind of collections yet will always yield a Sequence-typed result except for OrderedSet which returns an OrderedSet.

For the purpose of these examples we'll assume here that we have a Class *Employee* with an attribute *age*. Our model contains two employees such as *employee1.age = 24* and *employee2.age = 27*.

Expression Result
self.employees->sortedBy(age) Sequence{employee1, employee2}


sum () : Real

Returns the sum of all elements contained in self if they support the '+' operation.

Expression Result
Sequence{2.3, 5.2} in c->sum() 7.5
Sequence{2, 4} in c->sum() 6
Sequence{2, '4'} in c->sum() invalid


Ocl operations for type *Sequence*

= ( seq : Sequence(T) ) : Boolean

Returns true if self contains the very same objects as *seq* in the very same order as they are in *seq*.

Expression Result
Sequence{4, 5, 'test'} = Sequence{4, 5, 'test'} true
Sequence{4, 5, 'test'} = Sequence{4, 'test', 5} false
Sequence{4, 5, 'test', 5} = Sequence{4, 5, 'test'} false


<> ( seq : Sequence(T) ) : Boolean

Returns true if self does not contain the same objects as *seq*, or if these objects are not in the same order as they are in *seq*.

Expression Result
Sequence{4, 5, 'test'} = Sequence{4, 5, 'test'} false
Sequence{4, 5, 'test'} = Sequence{4, 'test', 5} true
Sequence{4, 5, 'test', 5} = Sequence{4, 5, 'test'} true


append ( object : T ) : Sequence(T)

Returns a Sequence containing all elements of self followed by object.

Expression Result
Sequence{'a', 'b'}->append('c') Sequence{'a', 'b', 'c'}


at ( index : Integer ) : T

Returns the element of self at the *index* position.

Expression Result
Sequence{'a', 'b'}->at(1) a


first () : T

Returns the first element of self.

Expression Result
Sequence{1, 2.0, '3'}->first() 1


indexOf ( object : T ) : Integer

Returns the position of object in sequence self.

Expression Result
Sequence{'a', 'b'}->indexOf('a') 1


insertAt ( index : Integer, object : T) : Sequence(T)

Returns a Sequence containing self with object inserted at the *index* position.

Expression Result
Sequence{'a', 'b'}->insertAt(0, 'c') invalid
Sequence{'a', 'b'}->insertAt(1, 'c') Sequence{'c', 'a', 'b'}
Sequence{'a', 'b'}->insertAt(3, 'c') Sequence{'a', 'b', 'c'}
Sequence{'a', 'b'}->insertAt(4, 'c') invalid


last () : T

Returns the last element of self.

Expression Result
Sequence{1, 2.0, '3'}->last() '3'


prepend ( object : T ) : Sequence(T)

Returns a Sequence containing object followed by all elements of self .

Expression Result
Sequence{'a', 'b'}->prepend('c') Sequence{'c', 'a', 'b'}


subSequence ( startIndex : Integer, endIndex : Integer ) : Sequence(T)

Returns a Sequence containing all elements of self between the positions 'startIndex' and 'endIndex'.

Expression Result
Sequence{'a', 'b', 'c', 'd'}->subSequence(2, 3) Sequence{'b', 'c'}
Sequence{'a', 'b', 'c', 'd'}->subSequence(4, 4) Sequence{'d'}


union ( seq : Sequence(T) ) : Sequence(T)

Returns a Sequence containing all elements of self followed by all elements of *seq*.

Expression Result
Sequence{'a', 'b', 'a'}->union(Sequence{'b', 'c'}) Sequence{'a', 'b', 'a', 'b', 'c'}


Ocl operations for type *Bag*

= ( bag : Bag(T) ) : Boolean

Returns true if self contains the same objects as *bag* in the same quantities.

Expression Result
Bag{4, 5, 'test', 4} = Bag{4, 'test', 5, 4} true
Bag{4, 5, 'test'} = Bag{4, 'test', 5} true
Bag{4, 5, 'test', 5} = Bag{4, 5, 'test'} false


<> ( bag : Bag(T) ) : Boolean

Returns true if self does not contain the same objects as *bag* in the same quantities.

Expression Result
Bag{4, 5, 'test'} = Bag{4, 5, 'test'} false
Bag{4, 5, 'test'} = Bag{4, 'test', 5} false
Bag{4, 5, 'test', 5} = Bag{4, 5, 'test'} true


intersection ( bag : Bag(T) ) : Bag(T)

Returns a Bag containing all elements of self that are also contained by *bag*.

Expression Result
Bag{'a', 'b', 'a'}->intersection(Bag{'a', 'b'}) Bag{'a', 'b'}
Bag{'a', 'b', 'a', 'b'}->intersection(Bag{'a', 'b', 'b'}) Bag{'b', 'a', 'b'}


intersection ( set : Set(T) ) : Set(T)

Returns a Set containing all elements of self that are also contained by *set*.

Expression Result
Bag{'a', 'b', 'a'}->intersection(Set{'a', 'b', 'c'}) Set{'a', 'b'}


union ( bag : Bag(T) ) : Bag(T)

Returns a Bag containing all elements of self and all elements of *bag*.

Expression Result
Bag{'a', 'b', 'a'}->union(Bag{'b', 'c'}) Bag{'b', 'a', 'b', 'a', 'c'}


union ( set : Set(T) ) : Bag(T)

Returns a Bag containing all elements of self and all elements of *set*.

Expression Result
Bag{'a', 'b', 'a'}->union(Set{'b', 'c'}) Bag{'b', 'c', 'a', 'b', 'a'}


Ocl operations for type *OrderedSet*

= ( set : Set(T) ) : Boolean

Returns true if self contains the same objects as *set*.

Expression Result
OrderedSet{3, 5, 4} = Set{3, 5, 4} true
OrderedSet{3, 5, 4} = Set{4, 3, 5, 4, 4} true
OrderedSet{3, 5, 4} = Set{2, 5 ,4, 4} false


= ( orderedset : OrderedSet(T) ) : Boolean

Returns true if self contains the same objects as *orderedset* regardless of element ordering.

Expression Result
OrderedSet{3, 5, 4} = OrderedSet{3, 5, 4} true
OrderedSet{4, 5, 'test', 5} = OrderedSet{4, 5, 'test'} true
OrderedSet{4, 5, 'test'} = OrderedSet{4, 'test', 5} true
OrderedSet{4, 5, 'test'} = OrderedSet{4, 'test'} false


<> ( set : Set(T) ) : Boolean

Returns true if self does not contain the same objects as *set*.

Expression Result
OrderedSet{4, 5, 'test', 4} <> Set{4, 5, 'test'} false
OrderedSet{4, 5, 'test', 4} <> Set{4, 'test', 5, 4} false
OrderedSet{4, 5, 'test', 4} <> Set{4, 5, 'test', 2} true


<> ( orderedset : OrderedSet(T) ) : Boolean

Returns true if self does not contain the same objects as *orderedset*.

Expression Result
OrderedSet{4, 5, 'test', 4} <> OrderedSet{4, 5, 'test') false
OrderedSet{4, 5, 'test', 4} <> OrderedSet{4, 'test', 5, 4} false
OrderedSet{4, 5, 'test', 4} <> OrderedSet{4, 5, 'test', 2} true


`-` ( set : Set(T) ) : Set(T)

Returns a Set containing all elements of self minus all elements of *set*.

Expression Result
OrderedSet{'a', 'b', 'c'} - Set{'c', 'a'} Set{'b'}


append ( object : T ) : OrderedSet(T)

Returns an OrderedSet containing all elements of self followed by object.

Expression Result
OrderedSet{'a', 'b'}->append('c') OrderedSet{'a', 'b', 'c'}


at ( index : Integer ) : T

Returns the element of self located at position *index* in the collection.

Expression Result
OrderedSet{'a', 'b'}->at(1) 'a'


first () : T

Returns the first element of self.

Expression Result
OrderedSet{1, 2.0, '3'}->first() 1


indexOf ( object : T ) : Integer

Returns the position of object in self.

Expression Result
OrderedSet{'a', 'b'}->indexOf('a') 1


insertAt ( index : Integer, object : T ) : OrderedSet(T)

Returns an OrderedSet containing self with object inserted at the *index* position.

Expression Result
OrderedSet{'a', 'b'}->insertAt(1, 'c') OrderedSet{'c', 'a', 'b'}
OrderedSet{'a', 'b'}->insertAt(3, 'c') OrderedSet{'a', 'b', 'c'}


intersection ( bag : Bag(T) ) : Set(T)

Returns a Set containing all elements of self that are also contained by *bag*.

Expression Result
OrderedSet{'a', 'b', 'a'}->intersection(Bag{'a', 'b'}) Set{'a', 'b'}


intersection ( set : Set(T) ) : Set(T)

Returns a Set containing all elements of self that are also contained by *set*.

Expression Result
OrderedSet{'a', 'b', 'a'}->intersection(Set{'a', 'b'}) Set{'a', 'b'}


last () : T

Returns the last element of self.

Expression Result
OrderedSet{1, 2.0, '3'}->last() '3'


prepend ( object : T ) : OrderedSet(T)

Returns an OrderedSet containing object followed by all elements of self.

Expression Result
OrderedSet{'a', 'b'}->prepend('c') OrderedSet{'c', 'a', 'b'}


subOrderedSet ( startIndex : Integer, endIndex : Integer ) : OrderedSet(T)

Returns an OrderedSet containing all elements of self between the positions *startIndex* and *endIndex*.

Expression Result
OrderedSet{'a', 'b', 'c', 'd'}->subOrderedSet(2, 3) OrderedSet{'b', 'c'}
OrderedSet{'a', 'b', 'c', 'd'}->subOrderedSet(4, 4) OrderedSet{'d'}


symmetricDifference ( set : Set(T) ) : Set(T)

Returns a Set containing all of the elements of self and *set* that are not present in both.

Expression Result
OrderedSet{'b', 'a', 'b', 'c'}->symmetricDifference(Set{'a', 'c', 'd'}) Set{'d', 'b'}


union ( bag : Bag(T) ) : Bag(T)

Returns a Bag containing all elements of self followed by all elements of *bag*.

Expression Result
OrderedSet{'a', 'b', 'a'}->union(Bag{'b', 'c'}) Bag{'a', 'c', 'b', 'b'}


union ( set : Set(T) ) : Set(T)

Returns a Set containing all elements of self followed by all elements of *set*.

Expression Result
OrderedSet{'a', 'b', 'a'}->union(Set{'b', 'c'}) Set{'a', 'c', 'b'}


Ocl operations for type *Set*

= ( set : Set(T) ) : Boolean

Returns true if self contains the same objects as *set*.

Expression Result
Set{3, 5, 4} = Set{3, 5, 4} true
Set{3, 5, 4} = Set{3, 4, 4, 5} true
Set{3, 5, 4} = Set{2, 3, 5, 4} false


<> ( set : Set(T) ) : Boolean

Returns true if self does not contain the same objects as *set*.

Expression Result
Set{4, 5, 'test', 4} <> Set{4, 5, 'test'} false
Set{4, 5, 'test', 4} <> Set{5, 4, 'test', 4} false
Set{4, 5, 'test', 4} <> Set{4, 'test', 5, 2} true


`-` ( set : Set(T) ) : Set(T)

Returns a Set containing all elements of self minus all elements of *set*.

Expression Result
Set{'a', 'b', 'c'} - Set{'c', 'a'} Set{'b'}


intersection ( bag : Bag(T) ) : Set(T)

Returns a Bag containing all elements of self that are also contained in *bag*.

Expression Result
Set{'a', 'b', 'a'}->intersection(Bag{'a', 'b', 'c'}) Set{'a', 'b'}


intersection ( set : Set(T) ) : Set(T)

Returns a Set containing all elements of self that are also contained in *set*.

Expression Result
Set{'a', 'b', 'a'}->intersection(Set{'a', 'b', 'c'}) Set{'b', 'a'}


symmetricDifference ( set : Set(T) ) : Set(T)

Returns a Set containing all of the elements of self and *set* that are not present in both.

Expression Result
Set{'b', 'a', 'b', 'c'}->symmetricDifference(Set{'a', 'c', 'd'}) Set{'b', 'd'}


union ( bag : Bag(T) ) : Bag(T)

Returns a Bag containing all elements of self and all elements of *bag*.

Expression Result
Set{'a', 'b', 'a'}->union(Bag{'b', 'c'}) Bag{'a', 'c', 'b', 'b'}


union ( set : Set(T) ) : Set(T)

Returns a Set containing all elements of self and all elements of *set*.

Expression Result
Set{'a', 'b', 'a'}->union(Set{'b', 'c'}) Set{'a', 'c', 'b'}


Ocl operations for type *Boolean*

And

And True False Invalid
True true false true
False false false false
Invalid invalid false invalid

Implies

Implies True False Invalid
True true false invalid
False true true true
Invalid true invalid invalid


Or

Or True False Invalid
True true true true
False true false invalid
Invalid true invalid invalid


Not

Not Result
True false
False true
Invalid invalid


Xor

Xor True False Invalid
True false true invalid
False true false invalid
Invalid invalid invalid invalid



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