Package org.drools.core.base.accumulators

Class CollectAccumulator

java.lang.Object

org.drools.core.base.accumulators.CollectAccumulator

All Implemented Interfaces:

Externalizable, Serializable, Accumulator, Invoker, RuleComponent

public class CollectAccumulator
extends Object
implements Accumulator, Externalizable

An accumulator to execute "collect" CEs

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.drools.core.spi.Accumulator

Accumulator.SafeAccumulator

Constructor Summary

Constructors

Constructor	Description
CollectAccumulator()
CollectAccumulator(Collect collect, boolean unwrapHandle)

Method Summary

Modifier and Type	Method	Description
Object	accumulate(Object workingMemoryContext, Object context, Tuple leftTuple, InternalFactHandle handle, Declaration[] declarations, Declaration[] innerDeclarations, WorkingMemory workingMemory)	Executes the accumulate (action) code for the given fact handle
Object	createContext()	Creates the context object for an accumulator session.
Object	createWorkingMemoryContext()	Creates and return a context object for each working memory instance
Object	getResult(Object workingMemoryContext, Object context, Tuple leftTuple, Declaration[] declarations, WorkingMemory workingMemory)	Gets the result of the accummulation
Object	init(Object workingMemoryContext, Object context, Tuple leftTuple, Declaration[] declarations, WorkingMemory workingMemory)	Executes the initialization block of code
void	readExternal(ObjectInput in)
boolean	supportsReverse()	Returns true if this accumulator supports operation reversal
boolean	tryReverse(Object workingMemoryContext, Object context, Tuple leftTuple, InternalFactHandle handle, Object value, Declaration[] declarations, Declaration[] innerDeclarations, WorkingMemory workingMemory)	Reverses the accumulate action for the given fact handle
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectAccumulator

public CollectAccumulator()

CollectAccumulator

public CollectAccumulator(Collect collect,
                          boolean unwrapHandle)

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

createContext

public Object createContext()

Description copied from interface: Accumulator

Creates the context object for an accumulator session. The context is passed as a parameter to every subsequent accumulator method call in the same session.

Specified by:

createContext in interface Accumulator

Returns:

init

public Object init(Object workingMemoryContext,
                   Object context,
                   Tuple leftTuple,
                   Declaration[] declarations,
                   WorkingMemory workingMemory)

Description copied from interface: Accumulator

Executes the initialization block of code

Specified by:

init in interface Accumulator

leftTuple - tuple causing the rule fire

declarations - previous declarations

accumulate

public Object accumulate(Object workingMemoryContext,
                         Object context,
                         Tuple leftTuple,
                         InternalFactHandle handle,
                         Declaration[] declarations,
                         Declaration[] innerDeclarations,
                         WorkingMemory workingMemory)

Description copied from interface: Accumulator

Executes the accumulate (action) code for the given fact handle

Specified by:

accumulate in interface Accumulator

tryReverse

public boolean tryReverse(Object workingMemoryContext,
                          Object context,
                          Tuple leftTuple,
                          InternalFactHandle handle,
                          Object value,
                          Declaration[] declarations,
                          Declaration[] innerDeclarations,
                          WorkingMemory workingMemory)

Description copied from interface: Accumulator

Reverses the accumulate action for the given fact handle

Specified by:

tryReverse in interface Accumulator

getResult

public Object getResult(Object workingMemoryContext,
                        Object context,
                        Tuple leftTuple,
                        Declaration[] declarations,
                        WorkingMemory workingMemory)

Description copied from interface: Accumulator

Gets the result of the accummulation

Specified by:

getResult in interface Accumulator

Returns:

supportsReverse

public boolean supportsReverse()

Description copied from interface: Accumulator

Returns true if this accumulator supports operation reversal

Specified by:

supportsReverse in interface Accumulator

Returns:

createWorkingMemoryContext

public Object createWorkingMemoryContext()

Description copied from interface: Accumulator

Creates and return a context object for each working memory instance

Specified by:

createWorkingMemoryContext in interface Accumulator

Returns: