Add working version of UpnFx

1 files changed, 23 insertions, 0 deletions

diff --git a/src/de/fhswf/in/inf/upnfx/util/Operator.java b/src/de/fhswf/in/inf/upnfx/util/Operator.java
new file mode 100644
index 0000000..4d1a8c6
--- /dev/null
+++ b/src/de/fhswf/in/inf/upnfx/util/Operator.java
@@ -0,0 +1,23 @@
+/**
+ *
+ */
+package de.fhswf.in.inf.upnfx.util;
+
+
+/**
+ * An interface for on UPN operator.
+ *
+ * @author $Author: $
+ * @version $Revision: $, $Date: $ UTC
+ */
+public interface Operator
+{
+   /**
+    * Gets a stack of doubles and calculates a new value to be put on the
+    * stack.
+    *
+    * @param upnStack
+    *           The UPN stack of the calculator.
+    */
+   void eval(ObservableDoubleStack upnStack);
+}