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

All Superinterfaces:

IConstraint, INRLAstNode

public interface IExistsStatement
extends IConstraint

One of the "exists" statements. Expresses that an element in a collection exists, or that a simple attribute exists. The statement contains an optional "cardinality constraint", which declares how many elements exist in a collection, and an optional "constraint", which specifies a constraint that has to hold for each element in the collection that is checked for existence.

Abstract syntax reference: exists (count:CardinalityConstraint)? element:ModelReference (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 each collection member being iterated over.
ICardinalityConstraint	getCount() Return the cardinality constraint (one, two, three, at least one, etc.), if there is one.
IModelReference	getElement() Return the model reference being checked for existence.
boolean	hasConstraint() Return true if there is a constraint attached that is to be executed relative to collection members.
boolean	hasCount() Return true if the exists statement has a counter attached to it.

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 each collection member being iterated over. Use hasConstraint() to check if it exists first.

Returns:

the constraint or null

getCount

ICardinalityConstraint getCount()

Return the cardinality constraint (one, two, three, at least one, etc.), if there is one. Else returns null. Call hasCount() to check first.

Returns:

the cardinality constraint or null

getElement

IModelReference getElement()

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

Returns:

the model reference

hasConstraint

boolean hasConstraint()

Return true if there is a constraint attached that is to be executed relative to collection members.

Returns:

true if a constraint is attached

hasCount

boolean hasCount()

Return true if the exists statement has a counter attached to it.

Returns:

true if there is a counter