--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding/src/org/eclipse/core/databinding/observable/IObservable.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,111 @@
+/*******************************************************************************
+ * Copyright (c) 2005, 2008 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+module org.eclipse.core.databinding.observable.IObservable;
+
+import java.lang.all;
+
+/**
+ * An object with state that allows to listen for state changes.
+ * 
+ * <p>
+ * Implementations must not manage listeners themselves, listener management
+ * must be delegated to a private instance of type {@link ChangeSupport} if it
+ * is not inherited from {@link AbstractObservable}.
+ * </p>
+ * 
+ * @noextend This interface is not intended to be extended by clients.
+ * @noimplement This interface is not intended to be implemented by clients.
+ *              Clients should instead subclass one of the classes in the
+ *              framework that implement this interface. Note that direct
+ *              implementers of this interface outside of the framework will be
+ *              broken in future releases when methods are added to this
+ *              interface.
+ * 
+ * @since 1.0
+ * 
+ */
+public interface IObservable {
+
+    /**
+     * Returns the realm for this observable. Unless otherwise specified,
+     * getters and setters must be accessed from within this realm. Listeners
+     * will be within this realm when they receive events from this observable.
+     * <p>
+     * Because observables can only be accessed from within one realm, and they
+     * always fire events on that realm, their state can be observed in an
+     * incremental way. It is always safe to call getters of an observable from
+     * within a change listener attached to that observable.
+     * </p>
+     * 
+     * @return the realm
+     */
+    public Realm getRealm();
+
+    /**
+     * Adds the given change listener to the list of change listeners. Change
+     * listeners are notified about changes of the state of this observable in a
+     * generic way, without specifying the change that happened. To get the
+     * changed state, a change listener needs to query for the current state of
+     * this observable.
+     * 
+     * @param listener
+     */
+    public void addChangeListener(IChangeListener listener);
+
+    /**
+     * Removes the given change listener from the list of change listeners. Has
+     * no effect if the given listener is not registered as a change listener.
+     * 
+     * @param listener
+     */
+    public void removeChangeListener(IChangeListener listener);
+
+    /**
+     * Adds the given stale listener to the list of stale listeners. Stale
+     * listeners are notified when an observable object becomes stale, not when
+     * is becomes non-stale.
+     * 
+     * @param listener
+     * 
+     * @see #isStale()
+     */
+    public void addStaleListener(IStaleListener listener);
+
+    /**
+     * Removes the given stale listener from the list of stale listeners. Has no
+     * effect if the given listener is not registered as a stale listener.
+     * 
+     * @param listener
+     */
+    public void removeStaleListener(IStaleListener listener);
+
+    /**
+     * Returns whether the state of this observable is stale and is expected to
+     * change soon. A non-stale observable that becomes stale will notify its
+     * stale listeners. A stale object that becomes non-stale does so by
+     * changing its state and notifying its change listeners, it does <b>not</b>
+     * notify its stale listeners about becoming non-stale. Clients that do not
+     * expect asynchronous changes may ignore staleness of observable objects.
+     * 
+     * @return true if this observable's state is stale and will change soon.
+     * 
+     * @TrackedGetter - implementers must call
+     *                {@link ObservableTracker#getterCalledcast(IObservable)}.
+     */
+    public bool isStale();
+
+    /**
+     * Disposes of this observable object, removing all listeners registered
+     * with this object, and all listeners this object might have registered on
+     * other objects.
+     */
+    public void dispose();
+}