cdmlib-io/src/main/java/eu/etaxonomy/cdm/io/common/IIoObservable.java

   1 package eu.etaxonomy.cdm.io.common;
   2
   3 import java.util.Set;
   4
   5 import eu.etaxonomy.cdm.io.common.events.IIoObserver;
   6
   7 public interface IIoObservable {
   8
   9         /**
  10          * Sets the observers for this object
  11          * @return
  12          */
  13         public abstract Set<IIoObserver> getObservers();
  14
  15         /**
  16          * Adds a new observer for this object.
  17          * @param observer
  18          * @return
  19          */
  20         public abstract boolean addObserver(IIoObserver observer);
  21
  22         /**
  23          * Adds a set of new observer for this object.
  24          * @param observer
  25          * @return
  26          */
  27         public abstract void addObservers(Set<IIoObserver> observer);
  28
  29
  30         /**
  31          * Removes an observer from this object
  32          * @param observer
  33          * @return
  34          */
  35         public abstract boolean removeObserver(IIoObserver observer);
  36
  37         /**
  38          *  Clears the observer list so that this object no longer has any observers.
  39          */
  40         public void removeObservers();
  41
  42
  43         /**
  44          * Returns the number of observers of this Observable object.
  45          * @return number of observers
  46          */
  47         public int countObservers();
  48
  49 }