# Package org.optaplanner.core.impl.score.stream.drools.common

- Interface Summary
  Interface | Description
  --- | ---
  DroolsCondition.Mutator<InTuple,OutPatternVar,R extends DroolsRuleStructure<OutPatternVar>,C extends DroolsCondition<OutPatternVar,R>> |
  FactTuple |
  GroupByCollectorProcessor<InTuple,OutTuple> |

- Class Summary
  Class | Description
  --- | ---
  BiTuple<A,B> |
  DroolsAbstractAccumulateFunction<ResultContainer_,InTuple,OutTuple> |
  DroolsAbstractBiCollectingGroupByCollectorProcessor<ResultContainer1,ResultContainer2,InTuple,KeyTuple,OutTuple> |
  DroolsAbstractConstraintStream<Solution_> |
  DroolsAbstractGroupBy<InTuple,OutTuple> |
  DroolsAbstractGroupByAccumulator<InTuple> |
  DroolsAbstractUniCollectingGroupByCollectorProcessor<ResultContainer,InTuple,KeyTuple,OutTuple> |
  DroolsAccumulateContext<ResultContainer_> | Each context is uniquely identified by its `System.identityHashCode(Object)`.
  DroolsCondition<PatternVar,T extends DroolsRuleStructure<PatternVar>> | Encapsulates the low-level rule creation and manipulation operations via the Drools executable model DSL (see `PatternDSL`.
  DroolsPatternBuilder<T> | Instances of `PatternDSL.PatternDef` are mutable and as such can not be reused by constraint streams that could result in mutually different rules.
  DroolsRuleStructure<PatternVar> | Represents the left-hand side of a Drools rule.
  QuadTuple<A,B,C,D> |
  TriTuple<A,B,C> |

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