Class PreviousElementVariableListener<Solution_>
java.lang.Object
org.optaplanner.core.impl.domain.variable.nextprev.PreviousElementVariableListener<Solution_>
- All Implemented Interfaces:
Closeable
,AutoCloseable
,AbstractVariableListener<Solution_,
,Object> ListVariableListener<Solution_,
Object, Object>
public class PreviousElementVariableListener<Solution_>
extends Object
implements ListVariableListener<Solution_,Object,Object>
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected final PreviousElementShadowVariableDescriptor<Solution_>
protected final ListVariableDescriptor<Solution_>
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Constructor Summary
ConstructorsConstructorDescriptionPreviousElementVariableListener
(PreviousElementShadowVariableDescriptor<Solution_> shadowVariableDescriptor, ListVariableDescriptor<Solution_> sourceVariableDescriptor) -
Method Summary
Modifier and TypeMethodDescriptionvoid
afterEntityAdded
(ScoreDirector<Solution_> scoreDirector, Object entity) void
afterEntityRemoved
(ScoreDirector<Solution_> scoreDirector, Object entity) void
afterListVariableChanged
(ScoreDirector<Solution_> scoreDirector, Object entity, int fromIndex, int toIndex) Tells the listener that some elements within the range starting atfromIndex
(inclusive) and ending attoIndex
(exclusive) changed.void
afterListVariableElementUnassigned
(ScoreDirector<Solution_> scoreDirector, Object element) The listener must unset all shadow variables it is responsible for when an element is unassigned from the source list variable.void
beforeEntityAdded
(ScoreDirector<Solution_> scoreDirector, Object entity) void
beforeEntityRemoved
(ScoreDirector<Solution_> scoreDirector, Object entity) void
beforeListVariableChanged
(ScoreDirector<Solution_> scoreDirector, Object entity, int fromIndex, int toIndex) Tells the listener that some elements within the range starting atfromIndex
(inclusive) and ending attoIndex
(exclusive) will change.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.api.domain.variable.AbstractVariableListener
close, resetWorkingSolution
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Field Details
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shadowVariableDescriptor
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sourceVariableDescriptor
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Constructor Details
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PreviousElementVariableListener
public PreviousElementVariableListener(PreviousElementShadowVariableDescriptor<Solution_> shadowVariableDescriptor, ListVariableDescriptor<Solution_> sourceVariableDescriptor)
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Method Details
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beforeEntityAdded
- Specified by:
beforeEntityAdded
in interfaceAbstractVariableListener<Solution_,
Object> - Parameters:
scoreDirector
- never nullentity
- never null
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afterEntityAdded
- Specified by:
afterEntityAdded
in interfaceAbstractVariableListener<Solution_,
Object> - Parameters:
scoreDirector
- never nullentity
- never null
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beforeEntityRemoved
- Specified by:
beforeEntityRemoved
in interfaceAbstractVariableListener<Solution_,
Object> - Parameters:
scoreDirector
- never nullentity
- never null
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afterEntityRemoved
- Specified by:
afterEntityRemoved
in interfaceAbstractVariableListener<Solution_,
Object> - Parameters:
scoreDirector
- never nullentity
- never null
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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, aTask
'sstartTime
shadow variable must be reset tonull
after a task is unassigned fromEmployee.tasks
when the move that assigned it there is undone during Construction Heuristic phase.- Specified by:
afterListVariableElementUnassigned
in interfaceListVariableListener<Solution_,
Object, Object> - Parameters:
scoreDirector
- score directorelement
- the unassigned element
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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 atfromIndex
(inclusive) and ending attoIndex
(exclusive) will change. Be aware that theListVariableListener.afterListVariableChanged(org.optaplanner.core.api.score.director.ScoreDirector<Solution_>, Entity_, int, int)
call after the change is done often has a differentfromIndex
andtoIndex
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:
fromIndex
is greater than or equal to 0;toIndex
is less than or equal to the list variable size.toIndex
is greater than or equal tofromIndex
.- The range contains all elements that are going to be changed.
- The range may contain elements that are not going to be changed.
- The range may be empty (
fromIndex
equalstoIndex
) if none of the existing list variable elements are going to be changed.- Specified by:
beforeListVariableChanged
in interfaceListVariableListener<Solution_,
Object, Object> - Parameters:
scoreDirector
- score directorentity
- entity with the changed list variablefromIndex
- low endpoint (inclusive) of the changed rangetoIndex
- high endpoint (exclusive) of the changed range
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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 atfromIndex
(inclusive) and ending attoIndex
(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:
fromIndex
is greater than or equal to 0;toIndex
is less than or equal to the list variable size.toIndex
is greater than or equal tofromIndex
.- The range contains all elements that have changed.
- The range may contain elements that have not changed.
- The range may be empty (
fromIndex
equalstoIndex
) if none of the existing list variable elements have changed.- Specified by:
afterListVariableChanged
in interfaceListVariableListener<Solution_,
Object, Object> - Parameters:
scoreDirector
- score directorentity
- entity with the changed list variablefromIndex
- low endpoint (inclusive) of the changed rangetoIndex
- high endpoint (exclusive) of the changed range
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