org.optaplanner.core.api.domain.entity

## Annotation Type PlanningEntity

-     @Target(value=TYPE)
       @Retention(value=RUNTIME)
      public @interface PlanningEntity

  Specifies that the class is a planning entity. Each planning entity must have at least 1 `PlanningVariable` property.

  The class should have a public no-arg constructor, so it can be cloned (unless the `PlanningSolution.solutionCloner()` is specified).

- - ### Optional Element Summary

    Optional Elements
    Modifier and Type | Optional Element and Description
    --- | ---
    `Class<? extends Comparator>` | `difficultyComparatorClass` Allows a collection of planning entities to be sorted by difficulty.
    `Class<? extends SelectionSorterWeightFactory>` | `difficultyWeightFactoryClass` The `SelectionSorterWeightFactory` alternative for `difficultyComparatorClass()`.
    `Class<? extends SelectionFilter>` | `movableEntitySelectionFilter` An immovable planning entity is never changed during planning, this is useful in repeated planning use cases (such as continuous planning and real-time planning).

- - ### Element Detail

    - #### movableEntitySelectionFilter

          public abstract Class<? extends SelectionFilter> movableEntitySelectionFilter

      An immovable planning entity is never changed during planning, this is useful in repeated planning use cases (such as continuous planning and real-time planning).

      This applies to all the planning variables of this planning entity. To make individual variables immovable, see https://issues.jboss.org/browse/PLANNER-124

      The method `SelectionFilter.accept(ScoreDirector, Object)` returns false if the selection entity is immovable and it returns true if the selection entity is movable

      Returns:
        `PlanningEntity.NullMovableEntitySelectionFilter` when it is null (workaround for annotation limitation)
      Default:
        org.optaplanner.core.api.domain.entity.PlanningEntity.NullMovableEntitySelectionFilter.class

  - - #### difficultyComparatorClass

          public abstract Class<? extends Comparator> difficultyComparatorClass

      Allows a collection of planning entities to be sorted by difficulty. A difficultyWeight estimates how hard is to plan a certain PlanningEntity. Some algorithms benefit from planning on more difficult planning entities first/last or from focusing on them.

      The `Comparator` should sort in ascending difficulty (even though many optimization algorithms will reverse it). For example: sorting 3 processes on difficultly based on their RAM usage requirement: Process B (1GB RAM), Process A (2GB RAM), Process C (7GB RAM),

      Do not use together with `difficultyWeightFactoryClass()`.

      Returns:
        `PlanningEntity.NullDifficultyComparator` when it is null (workaround for annotation limitation)
      See Also:
        `difficultyWeightFactoryClass()`
      Default:
        org.optaplanner.core.api.domain.entity.PlanningEntity.NullDifficultyComparator.class

  - - #### difficultyWeightFactoryClass

          public abstract Class<? extends SelectionSorterWeightFactory> difficultyWeightFactoryClass

      The `SelectionSorterWeightFactory` alternative for `difficultyComparatorClass()`.

      Do not use together with `difficultyComparatorClass()`.

      Returns:
        `PlanningEntity.NullDifficultyWeightFactory` when it is null (workaround for annotation limitation)
      See Also:
        `difficultyComparatorClass()`
      Default:
        org.optaplanner.core.api.domain.entity.PlanningEntity.NullDifficultyWeightFactory.class

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