org.drools.rule.constraint
Class EvaluatorConstraint

java.lang.Object
  org.drools.rule.MutableTypeConstraint
      org.drools.rule.constraint.EvaluatorConstraint

All Implemented Interfaces:

Externalizable, Serializable, Cloneable, IntervalProviderConstraint, AlphaNodeFieldConstraint, BetaNodeFieldConstraint, Constraint, RuleComponent

public class EvaluatorConstraint
extends MutableTypeConstraint
implements IntervalProviderConstraint

See Also:

Serialized Form

Nested Class Summary

protected static class

EvaluatorConstraint.LiteralContextEntry

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

Constraint.ConstraintType

Field Summary

protected Declaration[]	declarations
protected Evaluator	evaluator
protected FieldValue	field
protected InternalReadAccessor	rightReadAccessor

Constructor Summary

EvaluatorConstraint()

EvaluatorConstraint(Declaration[] declarations, Evaluator evaluator, InternalReadAccessor extractor)

EvaluatorConstraint(FieldValue field, Evaluator evaluator, InternalReadAccessor extractor)

Method Summary

EvaluatorConstraint	clone() Clones the constraint
ContextEntry	createContextEntry()
Evaluator	getEvaluator()
FieldValue	getField()
Interval	getInterval()
Declaration[]	getRequiredDeclarations() Returns all the declarations required by the given constraint implementation.
protected InternalReadAccessor	getRightReadAccessor()
boolean	isAllowed(InternalFactHandle handle, InternalWorkingMemory workingMemory, ContextEntry context)
boolean	isAllowedCachedLeft(ContextEntry context, InternalFactHandle handle)
boolean	isAllowedCachedRight(LeftTuple tuple, ContextEntry context)
protected boolean	isLiteral()
boolean	isSelf()
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	writeExternal(ObjectOutput out)

Methods inherited from class org.drools.rule.MutableTypeConstraint

getType, setType

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.drools.spi.Constraint

getType

Field Detail

declarations

protected Declaration[] declarations

evaluator

protected Evaluator evaluator

rightReadAccessor

protected InternalReadAccessor rightReadAccessor

field

protected FieldValue field

Constructor Detail

EvaluatorConstraint

public EvaluatorConstraint()

EvaluatorConstraint

public EvaluatorConstraint(FieldValue field,
                           Evaluator evaluator,
                           InternalReadAccessor extractor)

EvaluatorConstraint

public EvaluatorConstraint(Declaration[] declarations,
                           Evaluator evaluator,
                           InternalReadAccessor extractor)

Method Detail

isLiteral

protected boolean isLiteral()

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

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

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:

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()

Specified by:

getInterval in interface IntervalProviderConstraint

getEvaluator

public Evaluator getEvaluator()

isSelf

public boolean isSelf()

getField

public FieldValue getField()

getRightReadAccessor

protected InternalReadAccessor getRightReadAccessor()

clone

public EvaluatorConstraint clone()

Description copied from interface: Constraint

Clones the constraint

Specified by:

clone in interface Constraint

Specified by:

clone in class MutableTypeConstraint

Returns:

createContextEntry

public ContextEntry createContextEntry()

Specified by:

createContextEntry in interface AlphaNodeFieldConstraint

Specified by:

createContextEntry in interface BetaNodeFieldConstraint

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class MutableTypeConstraint

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class MutableTypeConstraint

Throws:

IOException

ClassNotFoundException