Added products_only argument (from java cli) to decode method. (#9)

Author: vladvrabie

zxing/__init__.py

@@ -31,7 +31,7 @@ def __init__(self, classpath=None, java=None):
         else:
             self.classpath = os.path.join(os.path.dirname(__file__), 'java', '*')
 
-    def decode(self, filenames, try_harder=False, possible_formats=None, pure_barcode=False):
+    def decode(self, filenames, try_harder=False, possible_formats=None, pure_barcode=False, products_only=False):
         possible_formats = (possible_formats,) if isinstance(possible_formats, str) else possible_formats
 
         if isinstance(filenames, str):
@@ -46,6 +46,8 @@ def decode(self, filenames, try_harder=False, possible_formats=None, pure_barcod
             cmd.append('--try_harder')
         if pure_barcode:
             cmd.append('--pure_barcode')
+        if products_only:
+            cmd.append('--products_only')
         if possible_formats:
             for pf in possible_formats:
                 cmd += ['--possible_formats', pf ]