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Diffstat (limited to 'projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSNotificationCenter.java')
| -rw-r--r-- | projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSNotificationCenter.java | 1086 |
1 files changed, 473 insertions, 613 deletions
diff --git a/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSNotificationCenter.java b/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSNotificationCenter.java index aaf8261..cf0af53 100644 --- a/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSNotificationCenter.java +++ b/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSNotificationCenter.java @@ -30,642 +30,502 @@ import java.util.Vector; import net.wotonomy.foundation.internal.WotonomyException; /** -* NSNotificationCenter broadcasts NSNotifications to -* registered observers. Observers can register for all -* notifications of a specific type, or all notifications -* about a specific object, or both. Observers specify -* the method that will be called when they are notified. -* A global notification center can be accessed with -* defaultCenter(), but other centers can be created and -* used independently of the default center. <br><br> -* -* This implementation uses weak references for observers -* and observables. The advantage to this approach is -* that you do not need to explicitly unregister observers -* or observables; they will be unregistered when they are -* garbage-collected. Note that you will need to retain -* a reference to any objects you register or they may -* become unregistered if no other object references them. -* -* @author michael@mpowers.net -* @author $Author: cgruber $ -* @version $Revision: 893 $ -*/ -public class NSNotificationCenter -{ - /** - * Null marker class simplifies equals() logic - * for CompoundKey class below. - */ - public static final Object NullMarker = new Object(); - - private static NSNotificationCenter defaultCenter = null; - - /** - * A Map of (name,object) pairs to a List - * of (observer,selector) pairs. - */ - private Hashtable observers; // thread-safe - - /** - * Default constructor creates a new notification center. - */ - public NSNotificationCenter() - { - observers = new Hashtable(); - } - - /** - * Returns the system default center, creating one - * if it has not yet been created. - */ - static public NSNotificationCenter defaultCenter() - { - if ( defaultCenter == null ) - { - defaultCenter = new NSNotificationCenter(); - } - return defaultCenter; - } - + * NSNotificationCenter broadcasts NSNotifications to registered observers. + * Observers can register for all notifications of a specific type, or all + * notifications about a specific object, or both. Observers specify the method + * that will be called when they are notified. A global notification center can + * be accessed with defaultCenter(), but other centers can be created and used + * independently of the default center. <br> + * <br> + * + * This implementation uses weak references for observers and observables. The + * advantage to this approach is that you do not need to explicitly unregister + * observers or observables; they will be unregistered when they are + * garbage-collected. Note that you will need to retain a reference to any + * objects you register or they may become unregistered if no other object + * references them. + * + * @author michael@mpowers.net + * @author $Author: cgruber $ + * @version $Revision: 893 $ + */ +public class NSNotificationCenter { + /** + * Null marker class simplifies equals() logic for CompoundKey class below. + */ + public static final Object NullMarker = new Object(); + + private static NSNotificationCenter defaultCenter = null; + /** - * Addes the specified observer to the notification queue for - * notifications with the specified name or the specified - * object or both. - * @param anObserver The observer that wishes to be notified. - * @param aSelector The selector that will be invoked. - * Must have exactly one argument, to which a notification - * will be passed. - * @param notificationName The name of the notifications for - * which the observer will be notified. If null, will notify - * only based on matching anObject. - * @param anObject The object of the notifications for which - * the observer will be notified. If null, will notify - * only based on matching notificationName. - */ - public void addObserver( - Object anObserver, NSSelector aSelector, - String notificationName, Object anObject ) - { - // remove freed objects - processKeyQueue(); - - Object name = notificationName; - if ( name == null ) - { - name = NullMarker; - } - if ( anObject == null ) - { - anObject = NullMarker; - } - Object key = new CompoundKey( name, anObject ); - Object value = new CompoundValue( anObserver, aSelector ); - List list = (List) observers.get( key ); - if ( list == null ) - { - // create new list with value and put it in map - list = new Vector(); // thread-safe - list.add( value ); - observers.put( new CompoundKey( - name, anObject, keyQueue ), list ); - } - else - { - // add only if not already in list - if ( ! list.contains( value ) ) - { - list.add( value ); - } - } - } - + * A Map of (name,object) pairs to a List of (observer,selector) pairs. + */ + private Hashtable observers; // thread-safe + + /** + * Default constructor creates a new notification center. + */ + public NSNotificationCenter() { + observers = new Hashtable(); + } + + /** + * Returns the system default center, creating one if it has not yet been + * created. + */ + static public NSNotificationCenter defaultCenter() { + if (defaultCenter == null) { + defaultCenter = new NSNotificationCenter(); + } + return defaultCenter; + } + + /** + * Addes the specified observer to the notification queue for notifications with + * the specified name or the specified object or both. + * + * @param anObserver The observer that wishes to be notified. + * @param aSelector The selector that will be invoked. Must have exactly + * one argument, to which a notification will be passed. + * @param notificationName The name of the notifications for which the observer + * will be notified. If null, will notify only based on + * matching anObject. + * @param anObject The object of the notifications for which the + * observer will be notified. If null, will notify only + * based on matching notificationName. + */ + public void addObserver(Object anObserver, NSSelector aSelector, String notificationName, Object anObject) { + // remove freed objects + processKeyQueue(); + + Object name = notificationName; + if (name == null) { + name = NullMarker; + } + if (anObject == null) { + anObject = NullMarker; + } + Object key = new CompoundKey(name, anObject); + Object value = new CompoundValue(anObserver, aSelector); + List list = (List) observers.get(key); + if (list == null) { + // create new list with value and put it in map + list = new Vector(); // thread-safe + list.add(value); + observers.put(new CompoundKey(name, anObject, keyQueue), list); + } else { + // add only if not already in list + if (!list.contains(value)) { + list.add(value); + } + } + } + /** - * Posts the specified notification. Notifies all registered - * observers that match either the notification name or - * the notification object, or both. - * @param aNotification The notification that will be passed - * to the observers selector. - */ - public void postNotification( - NSNotification aNotification ) - { - List mergedList = new LinkedList(); - Object key, observerList; - - Object name = aNotification.name(); - Object object = aNotification.object(); - - if ( name != null ) - { - if ( object != null ) - { // both are specified - observerList = observers.get( new CompoundKey( name, object ) ); - if ( observerList != null ) - { - mergedList.addAll( (List) observerList ); - } - observerList = observers.get( new CompoundKey( name, NullMarker ) ); - if ( observerList != null ) - { - mergedList.addAll( (List) observerList ); - } - observerList = observers.get( new CompoundKey( NullMarker, object ) ); - if ( observerList != null ) - { - mergedList.addAll( (List) observerList ); - } - } - else - { // object is null - observerList = observers.get( new CompoundKey( name, NullMarker ) ); - if ( observerList != null ) - { - mergedList.addAll( (List) observerList ); - } - } - } - else - if ( object != null ) - { // name is null - observerList = observers.get( new CompoundKey( NullMarker, object ) ); - if ( observerList != null ) - { - mergedList.addAll( (List) observerList ); - } - } - - key = new CompoundKey( - NullMarker, NullMarker ); - observerList = observers.get( key ); - if ( observerList != null ) - { - mergedList.addAll( (List) observerList ); - } - - CompoundValue value; - Iterator it = mergedList.iterator(); - while ( it.hasNext() ) - { - value = (CompoundValue) it.next(); - if ( value.get() == null ) - { - it.remove(); - } - else - { - try - { - value.selector().invoke( - value.get(), - new Object[] { aNotification } ); - } - catch ( Exception exc ) - { - WotonomyException w = new WotonomyException( - "Error notifying object: " + value.get() + " : " + aNotification, exc ); + * Posts the specified notification. Notifies all registered observers that + * match either the notification name or the notification object, or both. + * + * @param aNotification The notification that will be passed to the observers + * selector. + */ + public void postNotification(NSNotification aNotification) { + List mergedList = new LinkedList(); + Object key, observerList; + + Object name = aNotification.name(); + Object object = aNotification.object(); + + if (name != null) { + if (object != null) { // both are specified + observerList = observers.get(new CompoundKey(name, object)); + if (observerList != null) { + mergedList.addAll((List) observerList); + } + observerList = observers.get(new CompoundKey(name, NullMarker)); + if (observerList != null) { + mergedList.addAll((List) observerList); + } + observerList = observers.get(new CompoundKey(NullMarker, object)); + if (observerList != null) { + mergedList.addAll((List) observerList); + } + } else { // object is null + observerList = observers.get(new CompoundKey(name, NullMarker)); + if (observerList != null) { + mergedList.addAll((List) observerList); + } + } + } else if (object != null) { // name is null + observerList = observers.get(new CompoundKey(NullMarker, object)); + if (observerList != null) { + mergedList.addAll((List) observerList); + } + } + + key = new CompoundKey(NullMarker, NullMarker); + observerList = observers.get(key); + if (observerList != null) { + mergedList.addAll((List) observerList); + } + + CompoundValue value; + Iterator it = mergedList.iterator(); + while (it.hasNext()) { + value = (CompoundValue) it.next(); + if (value.get() == null) { + it.remove(); + } else { + try { + value.selector().invoke(value.get(), new Object[] { aNotification }); + } catch (Exception exc) { + WotonomyException w = new WotonomyException( + "Error notifying object: " + value.get() + " : " + aNotification, exc); // throw w; - w.printStackTrace(); -postNotification( "Error notifying object", this, new NSDictionary( "exception", w ) ); - } - } - } - - } - + w.printStackTrace(); + postNotification("Error notifying object", this, new NSDictionary("exception", w)); + } + } + } + + } + /** - * Posts a notification created from the specified name - * and object. Calls postNotification( NSNotification ). - * @param notificationName a String key to distinguish - * this notification. - * @param anObject any object, by convention this is - * the originator of the notification. - */ - public void postNotification( - String notificationName, Object anObject ) - { - postNotification( new NSNotification( - notificationName, anObject ) ); - } - + * Posts a notification created from the specified name and object. Calls + * postNotification( NSNotification ). + * + * @param notificationName a String key to distinguish this notification. + * @param anObject any object, by convention this is the originator of + * the notification. + */ + public void postNotification(String notificationName, Object anObject) { + postNotification(new NSNotification(notificationName, anObject)); + } + /** - * Posts a notification created from the specified name, - * object, and info. Calls postNotification( NSNotification ). - * @param notificationName a String key to distinguish - * this notification. - * @param anObject any object, by convention this is - * the originator of the notification. - * @param userInfo a Map containing information specific - * to the originator of the notification and that may - * be of interest to a knowledgable observer. - */ - public void postNotification( - String notificationName, Object anObject, Map userInfo ) - { - postNotification( new NSNotification( - notificationName, anObject, userInfo ) ); - } - + * Posts a notification created from the specified name, object, and info. Calls + * postNotification( NSNotification ). + * + * @param notificationName a String key to distinguish this notification. + * @param anObject any object, by convention this is the originator of + * the notification. + * @param userInfo a Map containing information specific to the + * originator of the notification and that may be of + * interest to a knowledgable observer. + */ + public void postNotification(String notificationName, Object anObject, Map userInfo) { + postNotification(new NSNotification(notificationName, anObject, userInfo)); + } + /** - * Unregisters the specified observer from all notification - * queues for which it is registered. - * @param anObserver The observer to be unregistered. - */ - public void removeObserver( - Object anObserver ) - { - // remove freed objects - processKeyQueue(); - - Iterator it = new LinkedList( observers.keySet() ).iterator(); - while ( it.hasNext() ) - { - removeObserver( anObserver, it.next() ); - } - } - + * Unregisters the specified observer from all notification queues for which it + * is registered. + * + * @param anObserver The observer to be unregistered. + */ + public void removeObserver(Object anObserver) { + // remove freed objects + processKeyQueue(); + + Iterator it = new LinkedList(observers.keySet()).iterator(); + while (it.hasNext()) { + removeObserver(anObserver, it.next()); + } + } + /** - * Unregisters the specified observer from all notifications - * queues associated with the specified name or object or both. - * @param anObserver The observer to be unregistered, if null - * will unregister all observers for the specified notification - * name and object. - * @param notificationName The name of the notification for which - * the observer will be unregistered, if null will unregister - * the specified observer for all notifications with the - * specified object. - * @param anObject The object for the notification for which - * the observer will be unregistered, if null will unregister - * the specified observer for all objects with the specified - * notification. - */ - public void removeObserver( - Object anObserver, String notificationName, Object anObject ) - { - // remove freed objects - processKeyQueue(); - - // get key matches - List keys = matchingKeys( notificationName, anObject ); - - // remove specified observer from each matching key - Iterator it = keys.iterator(); - while ( it.hasNext() ) - { - removeObserver( anObserver, it.next() ); - } - } - - /** - * Returns all keys that match the specified name and object, - * but in this case null parameters are considered wildcards. - * Pass NullMarkers if you want to explicitly match nulls. - */ - private List matchingKeys( String name, Object object ) - { - List result = new LinkedList(); - - boolean willAdd; - CompoundKey key; - Iterator it = observers.keySet().iterator(); - while ( it.hasNext() ) - { - key = (CompoundKey) it.next(); - willAdd = false; - if ( ( name == null ) || ( name == key.name() ) ) - { - if ( ( object == null ) || ( object == key.get() ) ) - { - willAdd = true; - } - } - if ( willAdd ) - { - result.add( key ); - } - } - return result; - } - - /** - * Removes the specified observer from the list referenced - * by the specified key in the observer map. - */ - private void removeObserver( - Object anObserver, Object key ) - { - // if observer null, remove all observers for key - if ( anObserver == null ) - { - observers.remove( key ); - return; - } - - List list = (List) observers.get( key ); - if ( list == null ) return; - - // remove specified observer from list - Object observer; - Iterator it = list.iterator(); - while ( it.hasNext() ) - { - observer = ((CompoundValue)it.next()).get(); - if ( ( observer == null ) || ( anObserver == observer ) ) - { - // remove if match or freed object - it.remove(); - - // do not return; process entire list - } - } - if ( list.size() == 0 ) - { - observers.remove( key ); - } - } - - /* Reference queues for cleared WeakKeys */ - private ReferenceQueue keyQueue = new ReferenceQueue(); - - /** - * Removes any keys whose object has been garbage collected. - * (Garbage collected values are removed as they are encountered.) - */ - private void processKeyQueue() - { - CompoundKey ck; - while ((ck = (CompoundKey)keyQueue.poll()) != null) - { - //System.out.println( "EOObserverCenter.processQueue: removing object" ); - observers.remove(ck); - } - } - - /** - * Key combining a name with an object. - * The object is weakly referenced, and keys - * are deallocated by reference queue. - * equals() compares by reference. - */ - private static class CompoundKey extends WeakReference - { - private Object name; - private int hashCode; - - /** - * Creates compound key. - * Neither name nor object may be null. - * Use NullMarker to represent null - * in either name or object. - */ - public CompoundKey ( - Object aName, Object anObject ) - { - super( anObject ); - name = aName; - hashCode = aName.hashCode() + anObject.hashCode(); - } - - /** - * Creates compound key with queue. - * Neither name nor object may be null. - * Use NullMarker to represent null - * in either name or object. - */ - public CompoundKey ( - Object aName, Object anObject, ReferenceQueue aQueue ) - { - super( anObject, aQueue ); - name = aName; - hashCode = aName.hashCode() + anObject.hashCode(); - } - - public Object name() - { - return name; - } - - public int hashCode() - { - return hashCode; - } - - public boolean equals( Object anObject ) - { - if ( this == anObject ) return true; - // assumes only used with other compound keys - CompoundKey key = (CompoundKey) anObject; - if ( name == key.name || ( name != null && name.equals( key.name ) ) ) - { - Object object = get(); - if ( object != null ) - { - // compares by reference - if ( object == ( key.get() ) ) - { - return true; - } - } - } - return false; - } - - public String toString() - { - return "[CompoundKey:"+name()+":"+get()+"]"; - } - } - - /** - * Value combining an object with a selector. - * The object is weakly referenced, and null - * values are not allowed. - */ - private static class CompoundValue extends WeakReference - { - private NSSelector selector; - private int hashCode; - - public CompoundValue( Object anObject, NSSelector aSelector ) - { - super( anObject ); - hashCode = anObject.hashCode(); - selector = aSelector; - } - - public NSSelector selector() - { - return selector; - } - - public int hashCode() - { - return hashCode; - } - - public boolean equals( Object anObject ) - { - if ( this == anObject ) return true; - // assumes only used with other compound values - CompoundValue value = (CompoundValue) anObject; - if ( selector == value.selector || - ( selector != null && selector.equals( value.selector ) ) ) - { - Object object = get(); - if ( object != null ) - { - if ( object == value.get() ) - { - return true; - } - } - } - return false; - } - - public String toString() - { - return "[CompoundValue:"+get()+":"+selector().name()+"]"; - } - } -/* - public static void main( String[] argv ) - { - Object aSource = "aSource"; - Object bSource = "bSource"; - - Object oneTest = new OneTest(); - Object twoTest = new TwoTest(); - NSSelector notifyMeOnce = - new NSSelector( "notifyMeOnce", - new Class[] { NSNotification.class } ); - NSSelector notifyMeTwice = - new NSSelector( "notifyMeTwice", - new Class[] { NSNotification.class } ); - - NSNotificationCenter.defaultCenter().addObserver( - oneTest, notifyMeOnce, "aMessage", null ); - - NSNotificationCenter.defaultCenter().addObserver( - oneTest, notifyMeOnce, null, aSource ); - - NSNotificationCenter.defaultCenter().addObserver( - twoTest, notifyMeOnce, "aMessage", aSource ); - - NSNotificationCenter.defaultCenter().addObserver( - twoTest, notifyMeTwice, null, null ); - - NSNotificationCenter.defaultCenter().postNotification( - "aMessage", aSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "aMessage", bSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "bMessage", aSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "bMessage", bSource ); - System.out.println( "---" ); - - NSNotificationCenter.defaultCenter().removeObserver( - oneTest, null, aSource ); - - NSNotificationCenter.defaultCenter().postNotification( - "aMessage", aSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "aMessage", bSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "bMessage", aSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "bMessage", bSource ); - System.out.println( "---" ); - - NSNotificationCenter.defaultCenter().removeObserver( - null ); - - NSNotificationCenter.defaultCenter().postNotification( - "aMessage", aSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "aMessage", bSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "bMessage", aSource ); - System.out.println(); - NSNotificationCenter.defaultCenter().postNotification( - "bMessage", bSource ); - System.out.println( "---" ); - } - - static private class OneTest - { - public void notifyMeOnce( NSNotification aNotification ) - { - System.out.println( "OneTest.notifyMeOnce: " + aNotification ); - } - } - - static private class TwoTest - { - public void notifyMeOnce( NSNotification aNotification ) - { - System.out.println( "TwoTest.notifyMeOnce: " + aNotification ); - } - public void notifyMeTwice( NSNotification aNotification ) - { - System.out.println( "TwoTest.notifyMeTwice: " + aNotification ); - } - } -*/ -} + * Unregisters the specified observer from all notifications queues associated + * with the specified name or object or both. + * + * @param anObserver The observer to be unregistered, if null will + * unregister all observers for the specified + * notification name and object. + * @param notificationName The name of the notification for which the observer + * will be unregistered, if null will unregister the + * specified observer for all notifications with the + * specified object. + * @param anObject The object for the notification for which the + * observer will be unregistered, if null will + * unregister the specified observer for all objects + * with the specified notification. + */ + public void removeObserver(Object anObserver, String notificationName, Object anObject) { + // remove freed objects + processKeyQueue(); + // get key matches + List keys = matchingKeys(notificationName, anObject); + // remove specified observer from each matching key + Iterator it = keys.iterator(); + while (it.hasNext()) { + removeObserver(anObserver, it.next()); + } + } + + /** + * Returns all keys that match the specified name and object, but in this case + * null parameters are considered wildcards. Pass NullMarkers if you want to + * explicitly match nulls. + */ + private List matchingKeys(String name, Object object) { + List result = new LinkedList(); + + boolean willAdd; + CompoundKey key; + Iterator it = observers.keySet().iterator(); + while (it.hasNext()) { + key = (CompoundKey) it.next(); + willAdd = false; + if ((name == null) || (name == key.name())) { + if ((object == null) || (object == key.get())) { + willAdd = true; + } + } + if (willAdd) { + result.add(key); + } + } + return result; + } + + /** + * Removes the specified observer from the list referenced by the specified key + * in the observer map. + */ + private void removeObserver(Object anObserver, Object key) { + // if observer null, remove all observers for key + if (anObserver == null) { + observers.remove(key); + return; + } + + List list = (List) observers.get(key); + if (list == null) + return; + + // remove specified observer from list + Object observer; + Iterator it = list.iterator(); + while (it.hasNext()) { + observer = ((CompoundValue) it.next()).get(); + if ((observer == null) || (anObserver == observer)) { + // remove if match or freed object + it.remove(); + + // do not return; process entire list + } + } + if (list.size() == 0) { + observers.remove(key); + } + } + + /* Reference queues for cleared WeakKeys */ + private ReferenceQueue keyQueue = new ReferenceQueue(); + + /** + * Removes any keys whose object has been garbage collected. (Garbage collected + * values are removed as they are encountered.) + */ + private void processKeyQueue() { + CompoundKey ck; + while ((ck = (CompoundKey) keyQueue.poll()) != null) { + // System.out.println( "EOObserverCenter.processQueue: removing object" ); + observers.remove(ck); + } + } + + /** + * Key combining a name with an object. The object is weakly referenced, and + * keys are deallocated by reference queue. equals() compares by reference. + */ + private static class CompoundKey extends WeakReference { + private Object name; + private int hashCode; + + /** + * Creates compound key. Neither name nor object may be null. Use NullMarker to + * represent null in either name or object. + */ + public CompoundKey(Object aName, Object anObject) { + super(anObject); + name = aName; + hashCode = aName.hashCode() + anObject.hashCode(); + } + + /** + * Creates compound key with queue. Neither name nor object may be null. Use + * NullMarker to represent null in either name or object. + */ + public CompoundKey(Object aName, Object anObject, ReferenceQueue aQueue) { + super(anObject, aQueue); + name = aName; + hashCode = aName.hashCode() + anObject.hashCode(); + } + + public Object name() { + return name; + } + + public int hashCode() { + return hashCode; + } + + public boolean equals(Object anObject) { + if (this == anObject) + return true; + // assumes only used with other compound keys + CompoundKey key = (CompoundKey) anObject; + if (name == key.name || (name != null && name.equals(key.name))) { + Object object = get(); + if (object != null) { + // compares by reference + if (object == (key.get())) { + return true; + } + } + } + return false; + } + + public String toString() { + return "[CompoundKey:" + name() + ":" + get() + "]"; + } + } + + /** + * Value combining an object with a selector. The object is weakly referenced, + * and null values are not allowed. + */ + private static class CompoundValue extends WeakReference { + private NSSelector selector; + private int hashCode; + + public CompoundValue(Object anObject, NSSelector aSelector) { + super(anObject); + hashCode = anObject.hashCode(); + selector = aSelector; + } + + public NSSelector selector() { + return selector; + } + + public int hashCode() { + return hashCode; + } + + public boolean equals(Object anObject) { + if (this == anObject) + return true; + // assumes only used with other compound values + CompoundValue value = (CompoundValue) anObject; + if (selector == value.selector || (selector != null && selector.equals(value.selector))) { + Object object = get(); + if (object != null) { + if (object == value.get()) { + return true; + } + } + } + return false; + } + + public String toString() { + return "[CompoundValue:" + get() + ":" + selector().name() + "]"; + } + } + /* + * public static void main( String[] argv ) { Object aSource = "aSource"; Object + * bSource = "bSource"; + * + * Object oneTest = new OneTest(); Object twoTest = new TwoTest(); NSSelector + * notifyMeOnce = new NSSelector( "notifyMeOnce", new Class[] { + * NSNotification.class } ); NSSelector notifyMeTwice = new NSSelector( + * "notifyMeTwice", new Class[] { NSNotification.class } ); + * + * NSNotificationCenter.defaultCenter().addObserver( oneTest, notifyMeOnce, + * "aMessage", null ); + * + * NSNotificationCenter.defaultCenter().addObserver( oneTest, notifyMeOnce, + * null, aSource ); + * + * NSNotificationCenter.defaultCenter().addObserver( twoTest, notifyMeOnce, + * "aMessage", aSource ); + * + * NSNotificationCenter.defaultCenter().addObserver( twoTest, notifyMeTwice, + * null, null ); + * + * NSNotificationCenter.defaultCenter().postNotification( "aMessage", aSource ); + * System.out.println(); NSNotificationCenter.defaultCenter().postNotification( + * "aMessage", bSource ); System.out.println(); + * NSNotificationCenter.defaultCenter().postNotification( "bMessage", aSource ); + * System.out.println(); NSNotificationCenter.defaultCenter().postNotification( + * "bMessage", bSource ); System.out.println( "---" ); + * + * NSNotificationCenter.defaultCenter().removeObserver( oneTest, null, aSource + * ); + * + * NSNotificationCenter.defaultCenter().postNotification( "aMessage", aSource ); + * System.out.println(); NSNotificationCenter.defaultCenter().postNotification( + * "aMessage", bSource ); System.out.println(); + * NSNotificationCenter.defaultCenter().postNotification( "bMessage", aSource ); + * System.out.println(); NSNotificationCenter.defaultCenter().postNotification( + * "bMessage", bSource ); System.out.println( "---" ); + * + * NSNotificationCenter.defaultCenter().removeObserver( null ); + * + * NSNotificationCenter.defaultCenter().postNotification( "aMessage", aSource ); + * System.out.println(); NSNotificationCenter.defaultCenter().postNotification( + * "aMessage", bSource ); System.out.println(); + * NSNotificationCenter.defaultCenter().postNotification( "bMessage", aSource ); + * System.out.println(); NSNotificationCenter.defaultCenter().postNotification( + * "bMessage", bSource ); System.out.println( "---" ); } + * + * static private class OneTest { public void notifyMeOnce( NSNotification + * aNotification ) { System.out.println( "OneTest.notifyMeOnce: " + + * aNotification ); } } + * + * static private class TwoTest { public void notifyMeOnce( NSNotification + * aNotification ) { System.out.println( "TwoTest.notifyMeOnce: " + + * aNotification ); } public void notifyMeTwice( NSNotification aNotification ) + * { System.out.println( "TwoTest.notifyMeTwice: " + aNotification ); } } + */ +} /* - * $Log$ - * Revision 1.2 2006/02/16 13:15:00 cgruber - * Check in all sources in eclipse-friendly maven-enabled packages. + * $Log$ Revision 1.2 2006/02/16 13:15:00 cgruber Check in all sources in + * eclipse-friendly maven-enabled packages. * - * Revision 1.11 2003/06/03 14:51:15 mpowers - * Added commented-out println for debugging. + * Revision 1.11 2003/06/03 14:51:15 mpowers Added commented-out println for + * debugging. * - * Revision 1.10 2003/03/27 21:46:00 mpowers - * Better handling for null parameters on subscribe. - * Better handling for null parameters on post. + * Revision 1.10 2003/03/27 21:46:00 mpowers Better handling for null parameters + * on subscribe. Better handling for null parameters on post. * - * Revision 1.9 2003/01/28 19:44:38 mpowers - * Now comparing strings by value not reference. + * Revision 1.9 2003/01/28 19:44:38 mpowers Now comparing strings by value not + * reference. * - * Revision 1.8 2001/06/29 16:14:23 mpowers - * Fixed a javac compiler error that jikes allowed: shoe's on the other foot! + * Revision 1.8 2001/06/29 16:14:23 mpowers Fixed a javac compiler error that + * jikes allowed: shoe's on the other foot! * - * Revision 1.7 2001/06/07 22:09:03 mpowers - * Exceptions during a notification are no longer being thrown - * so we can assure that all notifications get handled. + * Revision 1.7 2001/06/07 22:09:03 mpowers Exceptions during a notification are + * no longer being thrown so we can assure that all notifications get handled. * Instead, we're printing stack traces... * - * Revision 1.6 2001/04/09 21:41:50 mpowers - * Better debugging. + * Revision 1.6 2001/04/09 21:41:50 mpowers Better debugging. * - * Revision 1.5 2001/03/15 21:09:06 mpowers - * Fixed notifications with null objects. + * Revision 1.5 2001/03/15 21:09:06 mpowers Fixed notifications with null + * objects. * - * Revision 1.4 2001/02/21 21:18:34 mpowers - * Clarified need to retain references. + * Revision 1.4 2001/02/21 21:18:34 mpowers Clarified need to retain references. * - * Revision 1.3 2001/02/21 18:31:07 mpowers - * Finished and tested implementation of NSNotificationCenter. + * Revision 1.3 2001/02/21 18:31:07 mpowers Finished and tested implementation + * of NSNotificationCenter. * - * Revision 1.1.1.1 2000/12/21 15:47:39 mpowers - * Contributing wotonomy. + * Revision 1.1.1.1 2000/12/21 15:47:39 mpowers Contributing wotonomy. * - * Revision 1.3 2000/12/20 16:25:38 michael - * Added log to all files. + * Revision 1.3 2000/12/20 16:25:38 michael Added log to all files. * * */ - |