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# Copyright (C) 2006, 2007, 2008 Google Inc.

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# This program is free software; you can redistribute it and/or modify

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# the Free Software Foundation; either version 2 of the License, or

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# General Public License for more details.

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"""Virtualization interface abstraction

"""

from ganeti import constants

from ganeti import errors

from ganeti.hypervisor import hv_fake

from ganeti.hypervisor import hv_xen

from ganeti.hypervisor import hv_kvm

_HYPERVISOR_MAP = {

    constants.HT_XEN_PVM: hv_xen.XenPvmHypervisor,

    constants.HT_XEN_HVM: hv_xen.XenHvmHypervisor,

    constants.HT_FAKE: hv_fake.FakeHypervisor,

    constants.HT_KVM: hv_kvm.KVMHypervisor,

    }

def GetHypervisorClass(ht_kind):

  """Return a Hypervisor class.

  This function returns the hypervisor class corresponding to the

  given hypervisor name.

  @type ht_kind: string

  @param ht_kind: The requested hypervisor type

  """

  if ht_kind not in _HYPERVISOR_MAP:

    raise errors.HypervisorError("Unknown hypervisor type '%s'" % ht_kind)

  cls = _HYPERVISOR_MAP[ht_kind]

  return cls

def GetHypervisor(ht_kind):

  """Return a Hypervisor instance.

  This is a wrapper over L{GetHypervisorClass} which returns an

  instance of the class.

  @type ht_kind: string

  @param ht_kind: The requested hypervisor type

  """

  cls = GetHypervisorClass(ht_kind)

  return cls()