org.drools.rule
Class VariableConstraint

java.lang.Object
  extended by org.drools.rule.MutableTypeConstraint
      extended by 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:


Copyright © 2001-2013 JBoss Inc.. All Rights Reserved.