org.drools.common
Class TupleStartEqualsConstraint

java.lang.Object
  extended by org.drools.common.TupleStartEqualsConstraint
All Implemented Interfaces:
Externalizable, Serializable, Cloneable, BetaNodeFieldConstraint, Constraint, RuleComponent

public class TupleStartEqualsConstraint
extends Object
implements BetaNodeFieldConstraint

Checks if one tuple is the start subtuple of other tuple. For instance, if we have two tuples: T1 = [ a, b, c ] T2 = [ a, b, c, d, e] This constraint will evaluate to true as T1 is the starting subtuple of T2. On the other hand, if we have: T1 = [ a, c, b ] T2 = [ a, b, c, d, e ] This constraint will evaluate to false, as T1 is not the starting subtuple of T2. Besides having the same elements, the order is different. This constraint is used when joining subnetworks back into the main network.

See Also:
Serialized Form

Nested Class Summary
static class TupleStartEqualsConstraint.TupleStartEqualsConstraintContextEntry
           
 
Nested classes/interfaces inherited from interface org.drools.spi.Constraint
Constraint.ConstraintType
 
Constructor Summary
TupleStartEqualsConstraint()
           
 
Method Summary
 Object clone()
          Clones the constraint
 ContextEntry createContextEntry()
           
 boolean equals(Object object)
           
static TupleStartEqualsConstraint getInstance()
           
 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
 int hashCode()
           
 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.
 String toString()
           
 void writeExternal(ObjectOutput out)
           
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

TupleStartEqualsConstraint

public TupleStartEqualsConstraint()
Method Detail

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException
Specified by:
readExternal in interface Externalizable
Throws:
IOException
ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException
Specified by:
writeExternal in interface Externalizable
Throws:
IOException

getInstance

public static TupleStartEqualsConstraint getInstance()

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

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:

createContextEntry

public ContextEntry createContextEntry()
Specified by:
createContextEntry in interface BetaNodeFieldConstraint

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

toString

public String toString()
Overrides:
toString in class Object

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
Overrides:
clone in class Object
Returns:

getType

public Constraint.ConstraintType getType()
Description copied from interface: Constraint
Returns the type of the constraint, either ALPHA, BETA or UNKNOWN

Specified by:
getType in interface Constraint
Returns:


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