org.eclipse.incquery.runtime.matchers.context

Interface IInputKey

All Known Implementing Classes:

BaseEMFTypeKey, BaseInputKeyWrapper, EClassTransitiveInstancesKey, EDataTypeInSlotsKey, EStructuralFeatureInstancesKey, JavaTransitiveInstancesKey

public interface IInputKey

An input key identifies an input (extensional) relation, such as the instance set of a given node or edge type, or the direct containment relation.

The input key, at the very minimum, is associated with an arity (number of columns), a user-friendly name, and a string identifier (for distributive purposes).

The input key itself must be an immutable data object that properly overrides equals() and hashCode(). It must be instantiable without using the query context object, so that query specifications may construct the appropriate PQueries.

Author:

Bergmann Gabor

Method Summary

Modifier and Type	Method and Description
int	getArity() The width of tuples in this relation.
java.lang.String	getPrettyPrintableName() A user-friendly name that can be shown on screen for degug purposes, included in exceptions, etc.
java.lang.String	getStringID() An internal string identifier that can be used to uniquely identify to input key (relevant for distributed applications).
boolean	isEnumerable() Returns true iff instance tuples of the key can be enumerated.

Method Detail

getPrettyPrintableName

java.lang.String getPrettyPrintableName()

A user-friendly name that can be shown on screen for degug purposes, included in exceptions, etc.

getStringID

java.lang.String getStringID()

An internal string identifier that can be used to uniquely identify to input key (relevant for distributed applications).

getArity

int getArity()

The width of tuples in this relation.

isEnumerable

boolean isEnumerable()

Returns true iff instance tuples of the key can be enumerated.

If false, the runtime can only test tuple membership in the extensional relation identified by the key, but not enumerate member tuples in general.