Source code for openlmi.storage.LMI_StorageExtent

# Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#
# Authors: Jan Safranek <jsafrane@redhat.com>
# -*- coding: utf-8 -*-
""""
Module for LMI_StorageExtent class.

LMI_StorageExtent
-----------------

.. autoclass:: LMI_StorageExtent
    :members:

"""

from openlmi.storage.ExtentProvider import ExtentProvider
import blivet
import openlmi.common.cmpi_logging as cmpi_logging

class LMI_StorageExtent(ExtentProvider):
    """
        Provider of generic LMI_StorageExtent class.

        It provides all StorageExtent instances, which do not have any
        specialized providers in LMI.
    """

    @cmpi_logging.trace_method
    def __init__(self, *args, **kwargs):
        super(LMI_StorageExtent, self).__init__(
                'LMI_StorageExtent', *args, **kwargs)

    @cmpi_logging.trace_method
    def provides_device(self, device):
        """
            Returns True, if this class is provider for given Anaconda
            StorageDevice class.
        """
        # Skip non-devices (e.g. for tmpfs, sysfs, ...)
        if  isinstance(device, blivet.devices.NoDevice):
            return False

        # Check if this device has specialized provider
        if  isinstance(device, blivet.devices.LVMVolumeGroupDevice):
            return False

        if  isinstance(device, blivet.devices.MDRaidArrayDevice):
            return False

        if  isinstance(device, blivet.devices.PartitionDevice):
            return False

        if  isinstance(device,
                blivet.devices.LVMLogicalVolumeDevice):
            return False

        # Otherwise, if it is StorageDevice, we provide it
        if isinstance(device, blivet.devices.StorageDevice):
            return True
        return False

    @cmpi_logging.trace_method
    def enumerate_devices(self):
        """
            Enumerate all StorageDevices, that this provider provides.
        """
        for device in self.storage.devices:
            if self.provides_device(device):
                yield device