first commit

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

@@ -0,0 +1,36 @@
+package org.nfunk.jep.function;
+
+import java.util.Stack;
+import java.util.Vector;
+import org.nfunk.jep.ParseException;
+
+public class Dot extends PostfixMathCommand {
+  static Add add = new Add();
+  
+  static Multiply mul = new Multiply();
+  
+  public void run(Stack paramStack) throws ParseException {
+    checkStack(paramStack);
+    Object object1 = paramStack.pop();
+    Object object2 = paramStack.pop();
+    paramStack.push(dot(object2, object1));
+  }
+  
+  public Object dot(Object paramObject1, Object paramObject2) throws ParseException {
+    if (paramObject1 instanceof Vector && paramObject2 instanceof Vector)
+      return dot((Vector)paramObject1, (Vector)paramObject2); 
+    throw new ParseException("Dot: Invalid parameter type, both arguments must be vectors");
+  }
+  
+  public Object dot(Vector paramVector1, Vector paramVector2) throws ParseException {
+    if (paramVector1.size() != paramVector2.size())
+      throw new ParseException("Dot: both sides of dot must be same length"); 
+    int i = paramVector1.size();
+    if (i < 1)
+      throw new ParseException("Dot: empty vectors parsed"); 
+    Object object = mul.mul(paramVector1.elementAt(0), paramVector2.elementAt(0));
+    for (byte b = 1; b < i; b++)
+      object = add.add(object, mul.mul(paramVector1.elementAt(b), paramVector2.elementAt(b))); 
+    return object;
+  }
+}