add recipe object

saucebrush/__init__.py

@@ -4,26 +4,39 @@
 
 import filters, emitters, sources, utils
 
-def run_recipe(source, *filter_args):
-    """ Process data, taking it from a source and applying any number of filters
-    """
+class Recipe(filters.Filter):
+    
+    def __init__(self, *filter_args):
+        self._filter_args = filter_args
+        self._rejected = []
+    
+    def process_record(self, record):
+        self.run(source=iter((record,)))
+    
+    def run(self, source):
         
         # connect datapath
         data = source
-    for filter_ in filter_args:
-        data = filter_(data)
+        for filter_ in self._filter_args:
+            data = filter_(self, data)
 
         # actually run the data through (causes iterators to actually be called)
         for record in data:
             pass
 
         # try and call done() on all filters
-    for filter_ in filter_args:
+        for filter_ in self._filter_args:
             try:
                 filter_.done()
             except AttributeError:
                 pass    # don't care if there isn't a done method
 
+def run_recipe(source, *filter_args):
+    """ Process data, taking it from a source and applying any number of filters
+    """
+    
+    Recipe(*filter_args).run(source)
+
 
 # experiment with threading - do not use
 

saucebrush/filters.py

@@ -33,9 +33,11 @@ class Filter(object):
         raise NotImplementedError('process_record not defined in ' +
                                   self.__class__.__name__)
 
-    def __call__(self, source):
+    def __call__(self, recipe, source):
         for record in source:
-            yield self.process_record(record)
+            result = self.process_record(record)
+            if not result is None:
+                yield result
 
 
 class YieldFilter(Filter):