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

## Interface ChildNode

- All Known Subinterfaces:
    `BiConstraintGraphNode`, `QuadConstraintGraphNode`, `TriConstraintGraphNode`, `UniConstraintGraphChildNode`
  All Known Implementing Classes:
    `AbstractConstraintModelChildNode`, `AbstractConstraintModelGroupingNode`, `AbstractConstraintModelJoiningNode`

      public interface ChildNode

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `List<ConstraintGraphNode>` | `getParentNodes()` | Retrieves an unmodifiable collection of unique nodes which precede this one.

- - ### Method Detail

    - #### getParentNodes

          List<ConstraintGraphNode> getParentNodes()

      Retrieves an unmodifiable collection of unique nodes which precede this one.
      Returns:
        never null, never empty. Most often contains one value, join nodes will have two.