org.drools.rule
Class VariableConstraint

java.lang.Object
  org.drools.rule.MutableTypeConstraint
      org.drools.rule.VariableConstraint

All Implemented Interfaces:

Externalizable, Serializable, Cloneable, Acceptor, AcceptsReadAccessor, AlphaNodeFieldConstraint, BetaNodeFieldConstraint, Constraint, RuleComponent

public class VariableConstraint
extends MutableTypeConstraint
implements AcceptsReadAccessor, Externalizable

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.drools.spi.Constraint

Constraint.ConstraintType

Constructor Summary

VariableConstraint()

VariableConstraint(InternalReadAccessor fieldExtractor, Declaration declaration, Evaluator evaluator)

VariableConstraint(InternalReadAccessor fieldExtractor, Restriction restriction)

Method Summary

Object	clone() Clones the constraint
ContextEntry	createContextEntry()
boolean	equals(Object object)
Evaluator	getEvaluator()
InternalReadAccessor	getFieldExtractor()
Interval	getInterval()
Declaration[]	getRequiredDeclarations() Returns all the declarations required by the given constraint implementation.
Restriction	getRestriction()
int	hashCode()
boolean	isAllowed(InternalFactHandle handle, InternalWorkingMemory workingMemory, ContextEntry context)
boolean	isAllowedCachedLeft(ContextEntry context, InternalFactHandle handle)
boolean	isAllowedCachedRight(LeftTuple tuple, ContextEntry context)
boolean	isTemporal() Returns true in case this constraint is a temporal constraint
void	readExternal(ObjectInput in)
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.
void	setReadAccessor(InternalReadAccessor readAccessor)
void	setRestriction(Restriction restriction)
String	toString()
void	writeExternal(ObjectOutput out)

Methods inherited from class org.drools.rule.MutableTypeConstraint

getType, setType

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

VariableConstraint

public VariableConstraint()

VariableConstraint

public VariableConstraint(InternalReadAccessor fieldExtractor,
                          Declaration declaration,
                          Evaluator evaluator)

VariableConstraint

public VariableConstraint(InternalReadAccessor fieldExtractor,
                          Restriction restriction)

Method Detail

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class MutableTypeConstraint

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class MutableTypeConstraint

Throws:

IOException

setRestriction

public void setRestriction(Restriction restriction)

setReadAccessor

public void setReadAccessor(InternalReadAccessor readAccessor)

Specified by:

setReadAccessor in interface AcceptsReadAccessor

getRequiredDeclarations

public Declaration[] getRequiredDeclarations()

Description copied from interface: Constraint

Returns all the declarations required by the given constraint implementation.

Specified by:

getRequiredDeclarations in interface Constraint

Returns:

replaceDeclaration

public void replaceDeclaration(Declaration oldDecl,
                               Declaration newDecl)

Description copied from interface: Constraint

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.

Specified by:

replaceDeclaration in interface Constraint

getFieldExtractor

public InternalReadAccessor getFieldExtractor()

getEvaluator

public Evaluator getEvaluator()

getRestriction

public Restriction getRestriction()

isAllowed

public boolean isAllowed(InternalFactHandle handle,
                         InternalWorkingMemory workingMemory,
                         ContextEntry context)

Specified by:

isAllowed in interface AlphaNodeFieldConstraint

isAllowedCachedLeft

public boolean isAllowedCachedLeft(ContextEntry context,
                                   InternalFactHandle handle)

Specified by:

isAllowedCachedLeft in interface BetaNodeFieldConstraint

isAllowedCachedRight

public boolean isAllowedCachedRight(LeftTuple tuple,
                                    ContextEntry context)

Specified by:

isAllowedCachedRight in interface BetaNodeFieldConstraint

isTemporal

public boolean isTemporal()

Description copied from interface: Constraint

Returns true in case this constraint is a temporal constraint

Specified by:

isTemporal in interface Constraint

Returns:

getInterval

public Interval getInterval()

toString

public String toString()

Overrides:

toString in class Object

createContextEntry

public ContextEntry createContextEntry()

Specified by:

createContextEntry in interface AlphaNodeFieldConstraint

Specified by:

createContextEntry in interface BetaNodeFieldConstraint

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object object)

Overrides:

equals in class Object

clone

public Object clone()

Description copied from interface: Constraint

Clones the constraint

Specified by:

clone in interface Constraint

Specified by:

clone in class MutableTypeConstraint

Returns: