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# -*- coding: utf-8 -*-

from __future__ import absolute_import, print_function, unicode_literals

# Import python libs
import logging
import threading

try:
    import pythoncom
    HAS_LIBS = True
except ImportError:
    HAS_LIBS = False

log = logging.getLogger(__name__)


def __virtual__():
    '''
    Only load if required libraries exist
    '''
    if not HAS_LIBS:
        return False
    else:
        return True


class Com(object):
    def __init__(self):
        self.need_com_init = not self._is_main_thread()

    def _is_main_thread(self):
        return threading.current_thread().name == 'MainThread'

    def __enter__(self):
        if self.need_com_init:
            log.debug('Initializing COM library')
            pythoncom.CoInitialize()

    def __exit__(self, exc_type, exc_value, traceback):
        if self.need_com_init:
            log.debug('Uninitializing COM library')
            pythoncom.CoUninitialize()

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