Package tools.refinery.interpreter.matchers.psystem.basicdeferred

Class Equality

java.lang.Object

tools.refinery.interpreter.matchers.psystem.BasePConstraint

tools.refinery.interpreter.matchers.psystem.DeferredPConstraint

tools.refinery.interpreter.matchers.psystem.basicdeferred.Equality

All Implemented Interfaces:

PConstraint, PTraceable

public class Equality
extends DeferredPConstraint

Field Summary

Fields inherited from class tools.refinery.interpreter.matchers.psystem.BasePConstraint

pBody

Fields inherited from interface tools.refinery.interpreter.matchers.psystem.PConstraint

COMPARE_BY_MONOTONOUS_ID

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
void	doReplaceVariable(PVariable obsolete, PVariable replacement)
Set<PVariable>	getDeducedVariables()	The set of variables whose potential values can be enumerated (once all non-deduced variables have known values).
Map<Set<PVariable>,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)
protected String	toStringRest()

Methods inherited from class tools.refinery.interpreter.matchers.psystem.BasePConstraint

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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Equality

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

Method Details

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)

Specified by:

doReplaceVariable in class BasePConstraint

toStringRest

protected String toStringRest()

Specified by:

toStringRest in class BasePConstraint

getWho

public PVariable getWho()

getWithWhom

public PVariable getWithWhom()

getDeducedVariables

public 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 Map<Set<PVariable>,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