Package org.drools.core.base.accumulators

Class CollectListAccumulateFunction

java.lang.Object

org.drools.core.base.accumulators.AbstractAccumulateFunction<CollectListAccumulateFunction.CollectListData>

org.drools.core.base.accumulators.CollectListAccumulateFunction

All Implemented Interfaces:

Externalizable, Serializable, AccumulateFunction<CollectListAccumulateFunction.CollectListData>

public class CollectListAccumulateFunction
extends AbstractAccumulateFunction<CollectListAccumulateFunction.CollectListData>

An implementation of an accumulator capable of collecting lists of values. This is similar to the "collect" CE, but allows us to collect any value, not only facts.

Example:

 rule "List employee names"
 when
     $names : List() from accumulate(
             Employee( $n : firstName, $l : lastName ),
             collectList( $n + " " + $l ) )
 then
     // do something
 end
 

The list accepts duplications and the order of the elements in the list is not guaranteed.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CollectListAccumulateFunction.CollectListData

Constructor Summary

Constructors

Constructor	Description
CollectListAccumulateFunction()

Method Summary

Modifier and Type	Method	Description
void	accumulate(CollectListAccumulateFunction.CollectListData data, Object value)
CollectListAccumulateFunction.CollectListData	createContext()
Object	getResult(CollectListAccumulateFunction.CollectListData data)
Class<?>	getResultType()
void	init(CollectListAccumulateFunction.CollectListData data)
void	readExternal(ObjectInput in)
void	reverse(CollectListAccumulateFunction.CollectListData data, Object value)
boolean	supportsReverse()
void	writeExternal(ObjectOutput out)

Methods inherited from class org.drools.core.base.accumulators.AbstractAccumulateFunction

equals, hashCode

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.kie.api.runtime.rule.AccumulateFunction

accumulateValue, initContext, tryReverse

Constructor Details

CollectListAccumulateFunction

public CollectListAccumulateFunction()

Method Details

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Throws:

IOException

createContext

public CollectListAccumulateFunction.CollectListData createContext()

init

public void init(CollectListAccumulateFunction.CollectListData data)

accumulate

public void accumulate(CollectListAccumulateFunction.CollectListData data,
 Object value)

reverse

public void reverse(CollectListAccumulateFunction.CollectListData data,
 Object value)

getResult

public Object getResult(CollectListAccumulateFunction.CollectListData data)

supportsReverse

public boolean supportsReverse()

getResultType

public Class<?> getResultType()