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#
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#
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# Copyright (C) 2006, 2007, 2008 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Virtualization interface abstraction
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"""
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from ganeti import constants
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from ganeti import errors
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from ganeti.hypervisor import hv_fake
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from ganeti.hypervisor import hv_xen
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from ganeti.hypervisor import hv_kvm
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from ganeti.hypervisor import hv_chroot
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_HYPERVISOR_MAP = {
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  constants.HT_XEN_PVM: hv_xen.XenPvmHypervisor,
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  constants.HT_XEN_HVM: hv_xen.XenHvmHypervisor,
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  constants.HT_FAKE: hv_fake.FakeHypervisor,
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  constants.HT_KVM: hv_kvm.KVMHypervisor,
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  constants.HT_CHROOT: hv_chroot.ChrootManager,
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  }
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def GetHypervisorClass(ht_kind):
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  """Return a Hypervisor class.
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  This function returns the hypervisor class corresponding to the
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  given hypervisor name.
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  @type ht_kind: string
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  @param ht_kind: The requested hypervisor type
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  """
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  if ht_kind not in _HYPERVISOR_MAP:
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    raise errors.HypervisorError("Unknown hypervisor type '%s'" % ht_kind)
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  cls = _HYPERVISOR_MAP[ht_kind]
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  return cls
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def GetHypervisor(ht_kind):
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  """Return a Hypervisor instance.
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  This is a wrapper over L{GetHypervisorClass} which returns an
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  instance of the class.
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  @type ht_kind: string
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  @param ht_kind: The requested hypervisor type
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  """
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  cls = GetHypervisorClass(ht_kind)
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  return cls()