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## org.optaplanner.core.impl.solver
Interface ProblemFactChange

    public interface ProblemFactChange

A ProblemFactChange represents a change in 1 or more problem facts of a `Solution`. Problem facts used by a `Solver` must not be changed while it is solving, but by scheduling this command to the `Solver`, you can change them when the time is right.

Note that the `Solver` clones a `Solution` at will. So any change must be done on the problem facts and planning entities referenced by the `Solution` of the `ScoreDirector`. On each change it should also notify the `ScoreDirector` accordingly.

Method Summary
`void` | `doChange(ScoreDirector scoreDirector)` Does the change on the `Solution` of the `ScoreDirector` and notifies the `ScoreDirector` accordingly.

Method Detail

### doChange

    void doChange(ScoreDirector scoreDirector)

  Does the change on the `Solution` of the `ScoreDirector` and notifies the `ScoreDirector` accordingly. Every modification to the `Solution`, must be correctly notified to the `ScoreDirector`, otherwise the `Score` calculation will be corrupted.

  Parameters:
    `scoreDirector` - never null Contains the working `Solution` which contains the planning facts (and planning entities) to change. Also needs to get notified of those changes.

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