def _process_leaves(self, virtual_cell, realizations, biiout):
'''for a virtual cell, creates the leaves if they don't exist
@param virtual_cell: the cell that serves as base
@param realizations: a set to add the leaves BlockCellNames
@param biiout: biiout
'''
block_cell_name = virtual_cell.name
for leave in virtual_cell.resource_leaves:
realizations.add(leave)
try:
cell = self.block_holder[leave.cell_name].cell
except KeyError:
#The leave it is pointing does not exist
biiout.info('%s virtual realization not existing, creating it' % leave)
cell = SimpleCell(leave)
cell.type = virtual_cell.type
content = Content(leave, Blob(""), created=True)
content.parser = parser_factory(cell.type, cell.name.cell_name)
self.block_holder.add_resource(Resource(cell, content))
cell.container = block_cell_name
