Bug 126658 [CommonNavigator] [DND] Complete definition of DND API
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/NavigatorContentExtension.java
try {
			synchronized (this) {
				if (contentProvider != null)
					contentProvider.dispose();
				if (labelProvider != null)
					labelProvider.dispose();
			}
		} finally {
			isDisposed = true;
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
	 */
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.navigator.extensions.INavigatorContentExtension#getAdapter(java.lang.Class)
	 */
	public Object getAdapter(Class adapter) {
		return null;
	}
	/**
	 * @return Returns the contentProviderInitializationFailed.
	 */
	public boolean hasContentProviderInitializationFailed() {
		return contentProviderInitializationFailed;
	}