retrieves the layer data for a component, if newer than indicated.
A timestamp can be provided, which is used to indicate
a point in time. The layer should be returned only if is modified
since that time.
Parameter aComponent
The name of the component to access.
Parameter aTimestamp
a timestamp for the layer.
An empty timestamp indicates, that the layer should be
retrieved irrespective of its modification time.
The format and meaning of a timestamp depends on
the implementation. Timestamps can be obtained using
::com::sun::star::util::XTimeStamped::getTimestamp().
Returns
a Layer object providing access to the layer data,
NULL if the layer is newer than indicated by the timestamp.
Throws
com::sun::star::lang::IllegalArgumentException
if the component identifier is invalid or
if the timestamp is invalid.
Throws
com::sun::star::configuration::backend::BackendAccessException
if an error occurs while accessing the data.
