Package org.drools.core.base.accumulators

Class JavaAccumulatorFunctionExecutor

java.lang.Object

org.drools.core.base.accumulators.JavaAccumulatorFunctionExecutor

All Implemented Interfaces:

Externalizable, Serializable, Accumulator, Invoker, Wireable, RuleComponent

public class JavaAccumulatorFunctionExecutor
extends Object
implements Accumulator, Externalizable, Wireable

A Java accumulator function executor implementation

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.drools.core.rule.accessor.Wireable

Wireable.Immutable

Constructor Summary

Constructors

Constructor	Description
JavaAccumulatorFunctionExecutor()
JavaAccumulatorFunctionExecutor(org.kie.api.runtime.rule.AccumulateFunction function)

Method Summary

Modifier and Type	Method	Description
Object	accumulate(Object workingMemoryContext, Object context, Tuple leftTuple, InternalFactHandle handle, Declaration[] declarations, Declaration[] innerDeclarations, ReteEvaluator reteEvaluator)	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
boolean	equals(Object o)
ReturnValueExpression	getExpression()
Object	getResult(Object workingMemoryContext, Object context, Tuple leftTuple, Declaration[] declarations, ReteEvaluator reteEvaluator)	Gets the result of the accummulation
int	hashCode()
Object	init(Object workingMemoryContext, Object context, Tuple leftTuple, Declaration[] declarations, ReteEvaluator reteEvaluator)	Executes the initialization block of code
void	readExternal(ObjectInput in)
void	setExpression(ReturnValueExpression expression)
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, ReteEvaluator reteEvaluator)	Reverses the accumulate action for the given fact handle
void	wire(Object object)
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.drools.core.rule.accessor.Accumulator

getRequiredDeclarations, replaceDeclaration

Methods inherited from interface org.drools.core.rule.accessor.Invoker

wrapsCompiledInvoker

Constructor Detail

JavaAccumulatorFunctionExecutor

public JavaAccumulatorFunctionExecutor()

JavaAccumulatorFunctionExecutor

public JavaAccumulatorFunctionExecutor(org.kie.api.runtime.rule.AccumulateFunction function)

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,
                   ReteEvaluator reteEvaluator)

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,
                         ReteEvaluator reteEvaluator)

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,
                          ReteEvaluator reteEvaluator)

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,
                        ReteEvaluator reteEvaluator)

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:

getExpression

public ReturnValueExpression getExpression()

wire

public void wire(Object object)

Specified by:

wire in interface Wireable

setExpression

public void setExpression(ReturnValueExpression expression)

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:

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object