first commit

hrmsEjb/org/nfunk/jep/function/Arg.java

@@ -0,0 +1,23 @@
+package org.nfunk.jep.function;
+
+import java.util.Stack;
+import org.nfunk.jep.ParseException;
+import org.nfunk.jep.type.Complex;
+
+public class Arg extends PostfixMathCommand {
+  private static final Double ONE = new Double(1.0D);
+  
+  public void run(Stack paramStack) throws ParseException {
+    checkStack(paramStack);
+    Object object = paramStack.pop();
+    paramStack.push(arg(object));
+  }
+  
+  public Number arg(Object paramObject) throws ParseException {
+    if (paramObject instanceof Complex)
+      return new Double(((Complex)paramObject).arg()); 
+    if (paramObject instanceof Number)
+      return ONE; 
+    throw new ParseException("Invalid parameter type");
+  }
+}