org.eclipse.ocl

Interface TypeChecker<C,O,P>

All Known Subinterfaces:

TypeChecker.Cached<C,O,P>

All Known Implementing Classes:

AbstractTypeChecker, BasicTypeChecker, CachedTypeChecker

public interface TypeChecker<C,O,P>

This optional interface is to be implemented by clients that want to add type checking capabilities to their Environment.

The AbstractTypeChecker provides the default implementation for the OCL type system. Rather than implement this interface, it is suggested that, if at al possible, clients extend the AbstractTypeChecker class, instead.

See the Environment interface for a description of the generic type parameters of this class. See the AbstractTypeChecker class for classes for implementation details.

Since:

1.3

Author:

Adolfo Sanchez-Barbudo Herrera (adolfosbh)

See Also:

AbstractTypeChecker

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	TypeChecker.Cached<C,O,P> The extended Cached interface supports dynamic dsiaptch and more focussed lookups.

Method Summary

Modifier and Type	Method and Description
boolean	checkMutuallyComparable(java.lang.Object problemObject, C type1, C type2, int opcode) Checks whether two types are mutually comparable in the determination of the applicability of = and <> operations.
C	commonSuperType(java.lang.Object problemObject, C type1, C type2) Get the common supertype of two types.
boolean	compatibleTypeMatch(C type1, C type2) Compare two types.
boolean	exactTypeMatch(C type1, C type2) Compare two types.
P	findAttribute(C owner, java.lang.String name) Finds the most specific (re)definition of an attribute in the specified classifier.
O	findOperationMatching(C owner, java.lang.String name, java.util.List<? extends TypedElement<C>> args) Finds an operation by signature in the specified classifier.
C	findSignalMatching(C receiver, java.util.List<C> signals, java.lang.String name, java.util.List<? extends TypedElement<C>> args) Find a matching signal in the specified list.
java.util.List<P>	getAttributes(C owner) Obtains all of the OCL attributes applicable to the specified owner type, including any that were defined in the OCL environment as additional attributes.
java.util.List<O>	getOperations(C owner) Obtains all of the OCL operations applicable to the specified owner type, including any that were defined in the OCL environment as additional operations.
C	getPropertyType(C owner, P property) Gets the type of a property, accounting for the fact that we may be navigating to it from an association class (in which the member ends of an association always have multiplicity 1) or not.
int	getRelationship(C type1, C type2) Queries the relationship, according to generalizations, of two types.
C	getResultType(java.lang.Object problemObject, C owner, O operation, java.util.List<? extends TypedElement<C>> args) Obtains the effective result type of the specified operation, which may or may not have parameters type by generic type variables.
boolean	isStandardLibraryFeature(C owner, java.lang.Object feature) Queries whether the specified feature (operation or attribute), as applied to a particular owner classifier, is defined by the standard library or not (in which case it would, presumably, be user-defined).
boolean	matchArgs(C owner, java.util.List<?> paramsOrProperties, java.util.List<? extends TypedElement<C>> args) Compares an actual argument list against the signature of an operation or a signal.
O	resolveGenericSignature(C owner, O oper) Resolves the signature of a generic operation (where it has parameters of type and/or T or T2) against the source type of the operation, as appropriate.

Method Detail

getRelationship

int getRelationship(C type1,
                    C type2)

Queries the relationship, according to generalizations, of two types. This operation accounts for the OCL Standard Library types, which the otherwise similar UMLReflection.getRelationship(Object, Object) method does not.

Parameters:

type1 - a type

type2 - another type

Returns:

the nature of their hierarchical relationship of type1 to type2, as enumerated in the UMLReflection interface

See Also:

UMLReflection.getRelationship(Object, Object)

getResultType

C getResultType(java.lang.Object problemObject,
                C owner,
                O operation,
                java.util.List<? extends TypedElement<C>> args)

Obtains the effective result type of the specified operation, which may or may not have parameters type by generic type variables. Many of the OCL Standard Library operations are either generic themselves or defined by generic types, so the return results depend on the argument and source types.

Parameters:

problemObject - the context object on which to report any problem that we may find in computing the result type. Usually this is some abstract or concrete syntax tree node

owner - the owner of the operation (type on which the operation is called)

operation - the operation signature

args - the arguments of the operation call, which are expressions or variables

Returns:

the effective result type of the corresponding operation, or null after reporting a problem if any of the argument types do not correspond to the source type and/or expected parameter types of the operation

getPropertyType

C getPropertyType(C owner,
                  P property)

Gets the type of a property, accounting for the fact that we may be navigating to it from an association class (in which the member ends of an association always have multiplicity 1) or not.

Parameters:

owner - the source of the navigation of the property, which may be an association class (the interesting scenario)

property - the property to navigate

Returns:

the effective type of the property, which may not be a collection type despite its declared multiplicity in the association class case

commonSuperType

C commonSuperType(java.lang.Object problemObject,
                  C type1,
                  C type2)

Get the common supertype of two types. This operation accounts for the OCL Standard Library types, which the otherwise similar UMLReflection.getCommonSuperType(Object, Object) method does not.

Parameters:

problemObject - the object which could have problems.

type1 - a type

type2 - another type

Returns:

their common supertype, if any, null if the two types have no common supertype

See Also:

UMLReflection.getCommonSuperType(Object, Object)

checkMutuallyComparable

boolean checkMutuallyComparable(java.lang.Object problemObject,
                                C type1,
                                C type2,
                                int opcode)

Checks whether two types are mutually comparable in the determination of the applicability of = and <> operations.

Parameters:

problemObject - the object which could have problems.

type1 - a type

type2 - another type

opcode - the operation code

Returns:

false if the types are not comparable

exactTypeMatch

boolean exactTypeMatch(C type1,
                       C type2)

Compare two types. Returns true if types are exactly equal, false otherwise.

Parameters:

type1 - a type

type2 - another type

Returns:

true if the same type

compatibleTypeMatch

boolean compatibleTypeMatch(C type1,
                            C type2)

Compare two types. Returns true if types are compatible, false otherwise.

Parameters:

type1 - a type

type2 - another type

Returns:

true if the same type or type1 is a strict subtype of type2.

getOperations

java.util.List<O> getOperations(C owner)

Obtains all of the OCL operations applicable to the specified owner type, including any that were defined in the OCL environment as additional operations.

Parameters:

owner - the operation owner type

Returns:

an unmodifiable list of its operations

getAttributes

java.util.List<P> getAttributes(C owner)

Obtains all of the OCL attributes applicable to the specified owner type, including any that were defined in the OCL environment as additional attributes.

Parameters:

owner - the attribute owner type

Returns:

an unmodifiable list of its attributes

resolveGenericSignature

O resolveGenericSignature(C owner,
                          O oper)

Resolves the signature of a generic operation (where it has parameters of type and/or T or T2) against the source type of the operation, as appropriate.

Parameters:

owner - the operation source type

oper - the generic operation

Returns:

the resolved parameter type

findSignalMatching

C findSignalMatching(C receiver,
                     java.util.List<C> signals,
                     java.lang.String name,
                     java.util.List<? extends TypedElement<C>> args)

Find a matching signal in the specified list.

Parameters:

receiver - the type that receives the signal

signals - the signals to search

name - name of signal to find

args - list of arguments to match against the signal signature

Returns:

the matching signal, or null if not found

findOperationMatching

O findOperationMatching(C owner,
                        java.lang.String name,
                        java.util.List<? extends TypedElement<C>> args)

Finds an operation by signature in the specified classifier.

Parameters:

owner - the classifier to search

name - the name of the operation

args - a list of arguments to match against the operation signature, as either expressions or variables

Returns:

the matching operation, or null if not found

matchArgs

boolean matchArgs(C owner,
                  java.util.List<?> paramsOrProperties,
                  java.util.List<? extends TypedElement<C>> args)

Compares an actual argument list against the signature of an operation or a signal.

Parameters:

owner - the type that owns the operation

paramsOrProperties - the operation parameters or signal attributes to match against the arguments

args - a list of OCLExpressions or Variables

Returns:

true or false

findAttribute

P findAttribute(C owner,
                java.lang.String name)

Finds the most specific (re)definition of an attribute in the specified classifier.

Parameters:

owner - the classifier to search

name - the name of the operation

Returns:

the matching operation, or null if not found

isStandardLibraryFeature

boolean isStandardLibraryFeature(C owner,
                                 java.lang.Object feature)

Queries whether the specified feature (operation or attribute), as applied to a particular owner classifier, is defined by the standard library or not (in which case it would, presumably, be user-defined).

Parameters:

owner - a classifier on which a feature is to be accessed

feature - the feature to be accessed

Returns:

whether the feature is defined by the standard library