def __call__(self, progress):
"""
"""
debug_print('BarcodePlugin.__call__')
if InliteEngine.available():
engine = InliteEngine(datamatrix=True)
elif LibDMTXEngine.available():
engine = LibDMTXEngine()
else:
raise InselectError('No barcode decoding engine available')
progress('Loading full-res image')
image_array = self.document.scanned.array
items = self.document.items
for index, item, crop in izip(count(), items, self.document.crops):
msg = u'Reading barcodes in box {0} of {1}'.format(1 + index, len(items))
progress(msg)
barcodes = self._decode_barcodes(engine, crop, progress)
if barcodes:
debug_print('Crop [{0}] - found [{1}]'.format(index, barcodes))
# TODO LH This mapping to come from metadata config?
item['fields']['catalogNumber'] = barcodes
else:
debug_print('Crop [{0}] - no barcodes'.format(index))
self.items = items
debug_print('BarcodePlugin.__call__ exiting. [{0}] boxes'.format(len(items)))
def load_engine():
"""Returns an instance of the user's choice of barcode reading engine
"""
try:
from gouda.engines import InliteEngine, LibDMTXEngine, ZbarEngine
except ImportError:
raise InselectError('Barcode decoding is not available')
else:
settings = current_settings()
engine = settings['engine']
if 'libdmtx' == engine:
return LibDMTXEngine()
elif 'zbar' == engine:
return ZbarEngine()
elif 'inlite' == engine:
return InliteEngine(settings['inlite-format'])
else:
raise ValueError(
'Unrecognised barcode reader [{0}]'.format(engine))
