org.drools.core.spi

Interface Constraint

All Superinterfaces:

Cloneable, Externalizable, RuleComponent, Serializable

All Known Subinterfaces:

AlphaNodeFieldConstraint, BetaNodeFieldConstraint, IndexableConstraint, IntervalProviderConstraint

All Known Implementing Classes:

AbstractCompositeConstraint, EvaluatorConstraint, InstanceEqualsConstraint, InstanceNotEqualsConstraint, MutableTypeConstraint, MvelConstraint, NegConstraint, PredicateConstraint, QueryNameConstraint, TupleStartEqualsConstraint, XpathConstraint

public interface Constraint
extends RuleComponent, Externalizable, Cloneable

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	Constraint.ConstraintType An enum for Constraint Types

Method Summary

Methods

Modifier and Type	Method and Description
Constraint	clone() Clones the constraint
Declaration[]	getRequiredDeclarations() Returns all the declarations required by the given constraint implementation.
Constraint.ConstraintType	getType() Returns the type of the constraint, either ALPHA, BETA or UNKNOWN
boolean	isTemporal() Returns true in case this constraint is a temporal constraint
void	replaceDeclaration(Declaration oldDecl, Declaration newDecl) When a rule contains multiple logical branches, i.e., makes use of 'OR' CE, it is required to clone patterns and declarations for each logical branch.

Methods inherited from interface java.io.Externalizable

readExternal, writeExternal

Method Detail

getRequiredDeclarations

Declaration[] getRequiredDeclarations()

Returns all the declarations required by the given constraint implementation.

Returns:

replaceDeclaration

void replaceDeclaration(Declaration oldDecl,
                      Declaration newDecl)

When a rule contains multiple logical branches, i.e., makes use of 'OR' CE, it is required to clone patterns and declarations for each logical branch. Since this is done at ReteOO build type, when constraints were already created, eventually some constraints need to update their references to the declarations.

Parameters:

oldDecl -

newDecl -

clone

Constraint clone()

Clones the constraint

Returns:

getType

Constraint.ConstraintType getType()

Returns the type of the constraint, either ALPHA, BETA or UNKNOWN

Returns:

isTemporal

boolean isTemporal()

Returns true in case this constraint is a temporal constraint

Returns: