org.drools.rule.constraint
Class MvelConstraint

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

All Implemented Interfaces:

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

public class MvelConstraint
extends MutableTypeConstraint
implements IndexableConstraint

See Also:

Serialized Form

Nested Class Summary

static class	MvelConstraint.MvelContextEntry
static class	MvelConstraint.PlainIndexEvaluator
static class	MvelConstraint.UnificationContextEntry

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

Constraint.ConstraintType

Field Summary

static IndexEvaluator

INDEX_EVALUATOR

Constructor Summary

MvelConstraint()

MvelConstraint(String packageName, String expression, String operator)

MvelConstraint(String packageName, String expression, String operator, Declaration[] declarations, Declaration indexingDeclaration, InternalReadAccessor extractor)

Method Summary

Object	clone() Clones the constraint
ContextEntry	createContextEntry()
boolean	equals(Object object)
InternalReadAccessor	getFieldExtractor()
IndexEvaluator	getIndexEvaluator()
Declaration	getIndexingDeclaration()
Declaration[]	getRequiredDeclarations() Returns all the declarations required by the given constraint implementation.
int	hashCode()
boolean	isAllowed(InternalFactHandle handle, InternalWorkingMemory workingMemory, ContextEntry context)
boolean	isAllowedCachedLeft(ContextEntry context, InternalFactHandle handle)
boolean	isAllowedCachedRight(LeftTuple tuple, ContextEntry context)
boolean	isIndexable()
boolean	isJITAllowed(InternalFactHandle handle, InternalWorkingMemory workingMemory, ContextEntry context)
boolean	isTemporal() Returns true in case this constraint is a temporal constraint
boolean	isUnification()
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	unsetUnification()
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, toString, wait, wait, wait

Methods inherited from interface org.drools.spi.Constraint

getType

Field Detail

INDEX_EVALUATOR

public static final IndexEvaluator INDEX_EVALUATOR

Constructor Detail

MvelConstraint

public MvelConstraint()

MvelConstraint

public MvelConstraint(String packageName,
                      String expression,
                      String operator)

MvelConstraint

public MvelConstraint(String packageName,
                      String expression,
                      String operator,
                      Declaration[] declarations,
                      Declaration indexingDeclaration,
                      InternalReadAccessor extractor)

Method Detail

isUnification

public boolean isUnification()

Specified by:

isUnification in interface IndexableConstraint

unsetUnification

public void unsetUnification()

isIndexable

public boolean isIndexable()

Specified by:

isIndexable in interface IndexableConstraint

getIndexEvaluator

public IndexEvaluator getIndexEvaluator()

Specified by:

getIndexEvaluator in interface IndexableConstraint

isAllowed

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

Specified by:

isAllowed in interface AlphaNodeFieldConstraint

isJITAllowed

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

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

createContextEntry

public ContextEntry createContextEntry()

Specified by:

createContextEntry in interface AlphaNodeFieldConstraint

Specified by:

createContextEntry in interface BetaNodeFieldConstraint

getFieldExtractor

public InternalReadAccessor getFieldExtractor()

Specified by:

getFieldExtractor in interface IndexableConstraint

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:

getIndexingDeclaration

public Declaration getIndexingDeclaration()

Specified by:

getIndexingDeclaration in interface IndexableConstraint

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

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

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:

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:

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object object)

Overrides:

equals in class Object