def openDBDoc(self, filepath, mode='a', position=0):
"""
Open an existing hdf5 file and load it into the tree model.
:Parameters:
- `filepath`: full path of the database file we wish to open.
- `mode`: the opening mode of the database file. It can be 'r'ead-only
'w'rite or 'a'ppend
"""
is_open = False
if self.checkOpening(filepath):
# Open the database and add it to the tracking system
db_doc = dbdoc.DBDoc(filepath, mode)
self.mapDB(filepath, db_doc)
# Populate the model with the dbdoc
root_node = rootgroupnode.RootGroupNode(self, db_doc, self.root)
self.fdelta = frozenset([root_node])
self.gdelta = frozenset([])
self.ldelta = frozenset([])
self.links_delta = frozenset([])
self.insertRows(position, 1)
is_open = True
return is_open
def __init__(self, vtapp):
"""Create the model.
"""
# The underlying data structure used to populate the model
self.root = rootgroupnode.RootGroupNode(self)
super(DBsTreeModel, self).__init__(parent=None)
# The dictionary of open databases
self.__openDBs = {}
# Create the temporary database that will contain filtered tables
self.tmp_filepath = u''
self.tmp_dbdoc = self.__createTempDB()
# The Cut/CopiedNodeInfo dictionary
self.ccni = {}
self.vtapp = vtapp
self.vtgui = self.vtapp.gui
# Sets used to populate the model
self.fdelta = frozenset([])
self.gdelta = frozenset([])
self.ldelta = frozenset([])
self.links_delta = frozenset([])
self.rowsAboutToBeRemoved.connect(self.closeViews)
def createDBDoc(self, filepath, is_tmp_db=False):
"""
Create a new, empty database (:meth:`vitables.h5db.dbdoc.DBDoc`
instance).
:Parameters:
- `filepath`: the full path of the file being created.
- `is_tmp_db`: True if the `DBDoc` is tied to the temporary database
"""
try:
QtWidgets.qApp.setOverrideCursor(
QtGui.QCursor(QtCore.Qt.WaitCursor))
# Create the dbdoc
try:
db_doc = dbdoc.DBDoc(filepath, 'w', is_tmp_db)
except (tables.NodeError, OSError):
log.error(
translate(
'DBsTreeModel',
"""File creation failed due to unknown"""
"""reasons! Please, have a look to the """
"""last error displayed in the logger. If you """
"""think it's a bug, please report it to """
"""developers.""", 'A file creation error'))
return None
# Track the just created dbdoc
self.mapDB(filepath, db_doc)
# Populate the model with the dbdoc
root = rootgroupnode.RootGroupNode(self, db_doc, self.root,
is_tmp_db)
self.fdelta = frozenset([root])
self.gdelta = frozenset([])
self.ldelta = frozenset([])
self.links_delta = frozenset([])
self.insertRows(0, 1)
finally:
QtWidgets.qApp.restoreOverrideCursor()
return db_doc
