@@ -0,0 +1,155 @@
+package io.sigpipe.sing.graph;%0A%0Apublic class DataContainer %7B%0A%0A    public void merge(DataContainer container) %7B%0A%0A    %7D%0A%0A    public void clear() %7B%0A%0A    %7D%0A%0A%7D%0A

Add DataContainer stub