move the worker class to the obiseq package

pkg/obiseq/worker.go

@@ -0,0 +1,31 @@
+package obiseq
+
+type SeqAnnotator func(*BioSequence)
+
+type SeqWorker func(*BioSequence) *BioSequence
+type SeqSliceWorker func(BioSequenceSlice) BioSequenceSlice
+
+func AnnotatorToSeqWorker(function SeqAnnotator) SeqWorker {
+	f := func(seq *BioSequence) *BioSequence {
+		function(seq)
+		return seq
+	}
+	return f
+}
+
+func SeqToSliceWorker(worker SeqWorker, inplace bool) SeqSliceWorker {
+	f := func(input BioSequenceSlice) BioSequenceSlice {
+		output := input
+		if (! inplace) {
+			output = MakeBioSequenceSlice() 
+		}
+			for i,s := range(input) {
+				output[i] = worker(s)
+			}
+
+		return output
+	}
+
+	return f
+}
+