# Package org.optaplanner.core.api.score.stream.quad

The `ConstraintStream` API for four matched facts.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  QuadConstraintCollector<A,B,C,D,ResultContainer_,Result_> | Usually created with `ConstraintCollectors`.
  QuadConstraintStream<A,B,C,D> | A `ConstraintStream` that matches four facts.
  QuadJoiner<A,B,C,D> | Created with `Joiners`.

## Package org.optaplanner.core.api.score.stream.quad Description

The `ConstraintStream` API for four matched facts.

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