first commit

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

@@ -0,0 +1,45 @@
+package org.nfunk.jep.function;
+
+import java.util.Stack;
+import org.nfunk.jep.ParseException;
+import org.nfunk.jep.type.Complex;
+
+public class Subtract extends PostfixMathCommand {
+  public void run(Stack paramStack) throws ParseException {
+    checkStack(paramStack);
+    Object object1 = paramStack.pop();
+    Object object2 = paramStack.pop();
+    paramStack.push(sub(object2, object1));
+  }
+  
+  public Object sub(Object paramObject1, Object paramObject2) throws ParseException {
+    if (paramObject1 instanceof Complex) {
+      if (paramObject2 instanceof Complex)
+        return sub((Complex)paramObject1, (Complex)paramObject2); 
+      if (paramObject2 instanceof Number)
+        return sub((Complex)paramObject1, (Number)paramObject2); 
+    } else if (paramObject1 instanceof Number) {
+      if (paramObject2 instanceof Complex)
+        return sub((Number)paramObject1, (Complex)paramObject2); 
+      if (paramObject2 instanceof Number)
+        return sub((Number)paramObject1, (Number)paramObject2); 
+    } 
+    throw new ParseException("Invalid parameter type");
+  }
+  
+  public Double sub(Number paramNumber1, Number paramNumber2) {
+    return new Double(paramNumber1.doubleValue() - paramNumber2.doubleValue());
+  }
+  
+  public Complex sub(Complex paramComplex1, Complex paramComplex2) {
+    return new Complex(paramComplex1.re() - paramComplex2.re(), paramComplex1.im() - paramComplex2.im());
+  }
+  
+  public Complex sub(Complex paramComplex, Number paramNumber) {
+    return new Complex(paramComplex.re() - paramNumber.doubleValue(), paramComplex.im());
+  }
+  
+  public Complex sub(Number paramNumber, Complex paramComplex) {
+    return new Complex(paramNumber.doubleValue() - paramComplex.re(), -paramComplex.im());
+  }
+}