Package ai.timefold.solver.core.impl.domain.variable.nextprev

Class NextElementVariableListener<Solution_>

java.lang.Object
ai.timefold.solver.core.impl.domain.variable.nextprev.NextElementVariableListener<Solution_>
All Implemented Interfaces:
AbstractVariableListener<Solution_,Object>, ListVariableListener<Solution_,Object,Object>, Closeable, AutoCloseable
public class NextElementVariableListener<Solution_> extends Object implements ListVariableListener<Solution_,Object,Object>

  • Field Details

  • Constructor Details

  • Method Details

    • beforeEntityAdded

      public void beforeEntityAdded(ScoreDirector<Solution_> scoreDirector, Object entity)
      Specified by:
      beforeEntityAdded in interface AbstractVariableListener<Solution_,Object>
      Parameters:
      scoreDirector - never null
      entity - never null

    • afterEntityAdded

      public void afterEntityAdded(ScoreDirector<Solution_> scoreDirector, Object entity)
      Specified by:
      afterEntityAdded in interface AbstractVariableListener<Solution_,Object>
      Parameters:
      scoreDirector - never null
      entity - never null

    • beforeEntityRemoved

      public void beforeEntityRemoved(ScoreDirector<Solution_> scoreDirector, Object entity)
      Specified by:
      beforeEntityRemoved in interface AbstractVariableListener<Solution_,Object>
      Parameters:
      scoreDirector - never null
      entity - never null

    • afterEntityRemoved

      public void afterEntityRemoved(ScoreDirector<Solution_> scoreDirector, Object entity)
      Specified by:
      afterEntityRemoved in interface AbstractVariableListener<Solution_,Object>
      Parameters:
      scoreDirector - never null
      entity - never null

    • afterListVariableElementUnassigned

      public void afterListVariableElementUnassigned(ScoreDirector<Solution_> scoreDirector, Object element)
      Description copied from interface: ListVariableListener
      The listener must unset all shadow variables it is responsible for when an element is unassigned from the source list variable. For example, a Task's startTime shadow variable must be reset to null after a task is unassigned from Employee.tasks when the move that assigned it there is undone during Construction Heuristic phase.
      Specified by:
      afterListVariableElementUnassigned in interface ListVariableListener<Solution_,Object,Object>
      Parameters:
      scoreDirector - score director
      element - the unassigned element

    • beforeListVariableChanged

      public void beforeListVariableChanged(ScoreDirector<Solution_> scoreDirector, Object entity, int fromIndex, int toIndex)
      Description copied from interface: ListVariableListener
      Tells the listener that some elements within the range starting at fromIndex (inclusive) and ending at toIndex (exclusive) will change. Be aware that the ListVariableListener.afterListVariableChanged(ai.timefold.solver.core.api.score.director.ScoreDirector<Solution_>, Entity_, int, int) call after the change is done often has a different fromIndex and toIndex because the number of elements in the list variable can change.

      The list variable change includes:

      • Changing position (index) of one or more elements.
      • Removing one or more elements from the list variable.
      • Adding one or more elements to the list variable.
      • Any mix of the above.

      The range has the following properties:

      1. fromIndex is greater than or equal to 0; toIndex is less than or equal to the list variable size.
      2. toIndex is greater than or equal to fromIndex.
      3. The range contains all elements that are going to be changed.
      4. The range may contain elements that are not going to be changed.
      5. The range may be empty (fromIndex equals toIndex) if none of the existing list variable elements are going to be changed.
      Specified by:
      beforeListVariableChanged in interface ListVariableListener<Solution_,Object,Object>
      Parameters:
      scoreDirector - score director
      entity - entity with the changed list variable
      fromIndex - low endpoint (inclusive) of the changed range
      toIndex - high endpoint (exclusive) of the changed range

    • afterListVariableChanged

      public void afterListVariableChanged(ScoreDirector<Solution_> scoreDirector, Object entity, int fromIndex, int toIndex)
      Description copied from interface: ListVariableListener
      Tells the listener that some elements within the range starting at fromIndex (inclusive) and ending at toIndex (exclusive) changed.

      The list variable change includes:

      • Changing position (index) of one or more elements.
      • Removing one or more elements from the list variable.
      • Adding one or more elements to the list variable.
      • Any mix of the above.

      The range has the following properties:

      1. fromIndex is greater than or equal to 0; toIndex is less than or equal to the list variable size.
      2. toIndex is greater than or equal to fromIndex.
      3. The range contains all elements that have changed.
      4. The range may contain elements that have not changed.
      5. The range may be empty (fromIndex equals toIndex) if none of the existing list variable elements have changed.
      Specified by:
      afterListVariableChanged in interface ListVariableListener<Solution_,Object,Object>
      Parameters:
      scoreDirector - score director
      entity - entity with the changed list variable
      fromIndex - low endpoint (inclusive) of the changed range
      toIndex - high endpoint (exclusive) of the changed range