net.sourceforge.nrl.parser.ast.constraints
Interface IGlobalExistsStatement

All Superinterfaces:

IConstraint, INRLAstNode

public interface IGlobalExistsStatement
extends IConstraint

A "global" exists statement. This tests for the existence or absence of an object - rather than of an attribute or a member of a collection, like the exists statement.

Abstract syntax reference: thereIs ("no")? element:ModelReference (Variable)? (constraint:Constraint)?

Field Summary

Fields inherited from interface net.sourceforge.nrl.parser.ast.INRLAstNode

NEWLINE

Method Summary

IConstraint	getConstraint() Return the constraint to check relative to the object being iterated over.
int	getCount() Return the cardinality constraint if there is one.
IModelElement	getElement() Return the model element being checked for existence.
IVariable	getVariable() If the statement is used to check for the existence (rather than absence) of an element, the element can be assigned to a variable if found.
boolean	hasConstraint() Return true if there is a constraint attached that is to be executed relative to the model element.

Methods inherited from interface net.sourceforge.nrl.parser.ast.constraints.IConstraint

getNRLDataType, setNRLDataType

Methods inherited from interface net.sourceforge.nrl.parser.ast.INRLAstNode

accept, dump, getColumn, getLine, getUserData, setUserData

Method Detail

getConstraint

IConstraint getConstraint()

Return the constraint to check relative to the object being iterated over. Use hasConstraint() to check if it exists first.

Returns:

the constraint or null

getCount

int getCount()

Return the cardinality constraint if there is one. This will always return one or zero for the time being, zero indicating 'none'.

It never returns null.

Returns:

the cardinality constraint, as a number

getElement

IModelElement getElement()

Return the model element being checked for existence. Never returns null.

Returns:

the model element

getVariable

IVariable getVariable()

If the statement is used to check for the existence (rather than absence) of an element, the element can be assigned to a variable if found. If a variable is assigned, it is returned here.

Returns:

the variable or null if none was assigned

hasConstraint

boolean hasConstraint()

Return true if there is a constraint attached that is to be executed relative to the model element.

Returns:

true if a constraint is attached