def __init__(self, dbPath=None):
"""
init of the kernel
"""
self.__logger = logging.getLogger('DbKernel')
self.__logger.debug('__init__')
BaseDb.__init__(self)
# set the events
self.__logger.debug('set events')
self.saveEntityEvent = PyCadEvent()
self.deleteEntityEvent = PyCadEvent()
self.massiveDeleteEvent = PyCadEvent()
self.showEntEvent = PyCadEvent()
self.hideEntEvent = PyCadEvent()
self.updateShowEntEvent = PyCadEvent()
self.undoRedoEvent = PyCadEvent()
self.handledErrorEvent = PyCadEvent()
#create Connection
self.createConnection(dbPath)
# inizialize extentionObject
self.__UndoDb = UndoDb(self.getConnection())
self.__EntityDb = EntityDb(self.getConnection())
self.__RelationDb = RelationDb(self.getConnection())
# Some inizialization parameter
self.__bulkCommit = False
self.__bulkUndoIndex = -1 # undo index are always positive so we do not brake in case missing entity id
self.__entId = self.__EntityDb.getNewEntId()
# set the default style
self.__logger.debug('Set Style')
self.__activeStyleObj = None
self.__activeStyleObj = self.getMainStyle()
self.__settings = self.getDbSettingsObject()
self.__property = {}
#************************
#Inizialize Layer structure
#************************
self.__logger.debug('Inizialize layer structure')
try:
self.__LayerTable = LayerTable(self)
except StructuralError:
raise StructuralError, 'Unable to create LayerTree structure'
self.__logger.debug('Done inizialization')
