Bug 126658 [CommonNavigator] [DND] Complete definition of DND API
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.navigator.INavigatorContentService#getDnDService()
	 */
	public INavigatorDnDService getDnDService() {
		if (navigatorDnDService == null)
			navigatorDnDService = new NavigatorDnDService(this);
		return navigatorDnDService;
	}
	protected boolean isRootExtension(String anExtensionId) {
		return assistant.isRootExtension(anExtensionId);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.navigator.INavigatorContentService#removeListener(org.eclipse.ui.internal.navigator.extensions.INavigatorContentServiceListener)
	 */
	public void removeListener(INavigatorContentServiceListener aListener) {
		listeners.remove(aListener);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		return "ContentService[" + viewerDescriptor.getViewerId() + "]"; 
	}