IExtensionPoint extensionPoint = registry.getExtensionPoint( IExtensionConstants.EXTENSIONPOINT_ID );
IExtensionPoint extensionPoint = registry.getExtensionPoint( id );
	private List getExtensionElements( )	{		IExtensionRegistry registry = Platform.getExtensionRegistry( );		if ( registry == null )		{// extension registry cannot be resolved			return Collections.EMPTY_LIST;		}		IExtensionPoint extensionPoint = registry.getExtensionPoint( IExtensionConstants.EXTENSIONPOINT_ID );		if ( extensionPoint == null )		{// extension point cannot be resolved			return Collections.EMPTY_LIST;		}		return Arrays.asList( extensionPoint.getExtensions( ) );	}