org.eclipse.incquery.runtime.matchers.psystem.basicdeferred

Class Equality

java.lang.Object

org.eclipse.incquery.runtime.matchers.psystem.BasePConstraint

org.eclipse.incquery.runtime.matchers.psystem.DeferredPConstraint

org.eclipse.incquery.runtime.matchers.psystem.basicdeferred.Equality

All Implemented Interfaces:

PConstraint

public class Equality
extends DeferredPConstraint

Author:

Gabor Bergmann

Nested Class Summary

Nested classes/interfaces inherited from interface org.eclipse.incquery.runtime.matchers.psystem.PConstraint

PConstraint.CompareByMonotonousID

Constructor Summary

Constructors

Constructor and Description
Equality(PBody pBody, PVariable who, PVariable withWhom)

Method Summary

Modifier and Type	Method and Description
void	doReplaceVariable(PVariable obsolete, PVariable replacement)
java.util.Set<PVariable>	getDeducedVariables() The set of variables whose potential values can be enumerated (once all non-deduced variables have known values).
java.util.Map<java.util.Set<PVariable>,java.util.Set<PVariable>>	getFunctionalDependencies(IQueryMetaContext context) A (preferably minimal) cover of known functional dependencies between variables.
PVariable	getWho()
PVariable	getWithWhom()
boolean	isMoot() An equality is moot if it compares the a variable with itself.
boolean	isReadyAt(SubPlan plan, IQueryMetaContext context)

Methods inherited from class org.eclipse.incquery.runtime.matchers.psystem.BasePConstraint

checkSanity, delete, getAffectedVariables, getMonotonousID, getPSystem, replaceVariable, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Equality

public Equality(PBody pBody,
                PVariable who,
                PVariable withWhom)

Method Detail

isMoot

public boolean isMoot()

An equality is moot if it compares the a variable with itself.

Returns:

true, if the equality is moot

doReplaceVariable

public void doReplaceVariable(PVariable obsolete,
                              PVariable replacement)

getWho

public PVariable getWho()

getWithWhom

public PVariable getWithWhom()

getDeducedVariables

public java.util.Set<PVariable> getDeducedVariables()

Description copied from interface: PConstraint

The set of variables whose potential values can be enumerated (once all non-deduced variables have known values).

getFunctionalDependencies

public java.util.Map<java.util.Set<PVariable>,java.util.Set<PVariable>> getFunctionalDependencies(IQueryMetaContext context)

Description copied from interface: PConstraint

A (preferably minimal) cover of known functional dependencies between variables.

Specified by:

getFunctionalDependencies in interface PConstraint

Overrides:

getFunctionalDependencies in class BasePConstraint

Returns:

non-trivial functional dependencies in the form of {variables} --> {variables}, where dependencies with the same lhs are unified.

isReadyAt

public boolean isReadyAt(SubPlan plan,
                         IQueryMetaContext context)

Specified by:

isReadyAt in class DeferredPConstraint