Method Detail

• getObservable

  ObservableValue<V> getObservable()

  Returns:

  the ObservableValue that changed and send this event.

• getValue

  V getValue()

  Returns:

  the current value.

• getOldValue

  V getOldValue()

  Returns:

  the value before the change. May be null if the previous value was null or the old value is not available.

• hasOldValue

  boolean hasOldValue()

  Returns:

  true if the old value is available, false otherwise. For advanced performance the old value is not available for dynamically computed ObservableValues by default. It is guaranteed to be available if at least one of the registered ObservableEventListeners has called getValue() on the previous ObservableEvent forcing an eager evaluation.

• getChange

  <M> M getChange()

  Type Parameters:

  M - type of the change.

  Returns:

  the modification in case of a value change, null otherwise.

  See Also:

  ListChange, MapChange, SetChange

• isChange

  default boolean isChange()

  Returns:

  true if the value object instance itself has changed. Most ObservableValues contain immutable value types (such as String, Boolean, Integer, BigDecimal, Instant, etc.). However, values like e.g. Collection are mutable and may support notifying changes. Otherwise, if false the observable itself was modified and its value has changed (or was invalidated and needs to be recalculated).

  See Also:

  getChange()