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from .generic import BrotherQLBackendGeneric
available_backends = [
'pyusb',
'network',
'linux_kernel',
]
def guess_backend(identifier):
""" guess the backend from a given identifier string for the device """
if identifier.startswith('usb://') or identifier.startswith('0x'):
return 'pyusb'
elif identifier.startswith('file://') or identifier.startswith('/dev/usb/') or identifier.startswith('lp'):
return 'linux_kernel'
elif identifier.startswith('tcp://'):
return 'network'
else:
raise ValueError('Cannot guess backend for given identifier: %s' % identifier)
def backend_factory(backend_name):
if backend_name == 'pyusb':
from . import pyusb as pyusb_backend
list_available_devices = pyusb_backend.list_available_devices
backend_class = pyusb_backend.BrotherQLBackendPyUSB
elif backend_name == 'linux_kernel':
from . import linux_kernel as linux_kernel_backend
list_available_devices = linux_kernel_backend.list_available_devices
backend_class = linux_kernel_backend.BrotherQLBackendLinuxKernel
elif backend_name == 'network':
from . import network as network_backend
list_available_devices = network_backend.list_available_devices
backend_class = network_backend.BrotherQLBackendNetwork
else:
raise NotImplementedError('Backend %s not implemented.' % backend_name)
return {'list_available_devices': list_available_devices, 'backend_class': backend_class}
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