org.optaplanner.core.impl.domain.variable.anchor

## Class AnchorVariableListener<Solution_>

- java.lang.Object
- - org.optaplanner.core.impl.domain.variable.anchor.AnchorVariableListener<Solution_>

- Type Parameters:
    `Solution_` - the solution type, the class with the `PlanningSolution` annotation
  All Implemented Interfaces:
    AnchorVariableSupply, VariableListener<Object>, Supply

      public class AnchorVariableListener<Solution_>
      extends Object
      implements VariableListener<Object>, AnchorVariableSupply

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected AnchorShadowVariableDescriptor<Solution_>` | `anchorShadowVariableDescriptor`
    `protected SingletonInverseVariableSupply` | `nextVariableSupply`
    `protected VariableDescriptor<Solution_>` | `previousVariableDescriptor`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `AnchorVariableListener(AnchorShadowVariableDescriptor<Solution_> anchorShadowVariableDescriptor, VariableDescriptor<Solution_> previousVariableDescriptor, SingletonInverseVariableSupply nextVariableSupply)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `afterEntityAdded(ScoreDirector scoreDirector, Object entity)`
    `void` | `afterEntityRemoved(ScoreDirector scoreDirector, Object entity)`
    `void` | `afterVariableChanged(ScoreDirector scoreDirector, Object entity)`
    `void` | `beforeEntityAdded(ScoreDirector scoreDirector, Object entity)`
    `void` | `beforeEntityRemoved(ScoreDirector scoreDirector, Object entity)`
    `void` | `beforeVariableChanged(ScoreDirector scoreDirector, Object entity)`
    `Object` | `getAnchor(Object entity)`
    `protected void` | `insert(ScoreDirector scoreDirector, Object entity)`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.optaplanner.core.impl.domain.variable.listener.VariableListener

      `requiresUniqueEntityEvents`

- - ### Field Detail

    - #### anchorShadowVariableDescriptor

          protected final AnchorShadowVariableDescriptor<Solution_> anchorShadowVariableDescriptor

    - #### previousVariableDescriptor

          protected final VariableDescriptor<Solution_> previousVariableDescriptor

    - #### nextVariableSupply

          protected final SingletonInverseVariableSupply nextVariableSupply

  - ### Constructor Detail

    - #### AnchorVariableListener

          public AnchorVariableListener(AnchorShadowVariableDescriptor<Solution_> anchorShadowVariableDescriptor,
                                        VariableDescriptor<Solution_> previousVariableDescriptor,
                                        SingletonInverseVariableSupply nextVariableSupply)

  - ### Method Detail

    - #### beforeEntityAdded

          public void beforeEntityAdded(ScoreDirector scoreDirector,
                                        Object entity)

      Specified by:
        `beforeEntityAdded` in interface `VariableListener<Object>`
      Parameters:
        `scoreDirector` - never null
        `entity` - never null

    - #### afterEntityAdded

          public void afterEntityAdded(ScoreDirector scoreDirector,
                                       Object entity)

      Specified by:
        `afterEntityAdded` in interface `VariableListener<Object>`
      Parameters:
        `scoreDirector` - never null
        `entity` - never null

    - #### beforeVariableChanged

          public void beforeVariableChanged(ScoreDirector scoreDirector,
                                            Object entity)

      Specified by:
        `beforeVariableChanged` in interface `VariableListener<Object>`
      Parameters:
        `scoreDirector` - never null
        `entity` - never null

    - #### afterVariableChanged

          public void afterVariableChanged(ScoreDirector scoreDirector,
                                           Object entity)

      Specified by:
        `afterVariableChanged` in interface `VariableListener<Object>`
      Parameters:
        `scoreDirector` - never null
        `entity` - never null

    - #### beforeEntityRemoved

          public void beforeEntityRemoved(ScoreDirector scoreDirector,
                                          Object entity)

      Specified by:
        `beforeEntityRemoved` in interface `VariableListener<Object>`
      Parameters:
        `scoreDirector` - never null
        `entity` - never null

    - #### afterEntityRemoved

          public void afterEntityRemoved(ScoreDirector scoreDirector,
                                         Object entity)

      Specified by:
        `afterEntityRemoved` in interface `VariableListener<Object>`
      Parameters:
        `scoreDirector` - never null
        `entity` - never null

    - #### insert

          protected void insert(ScoreDirector scoreDirector,
                                Object entity)

    - #### getAnchor

          public Object getAnchor(Object entity)

      Specified by:
        `getAnchor` in interface `AnchorVariableSupply`
      Parameters:
        `entity` - never null
      Returns:
        sometimes null, the anchor for the entity

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