1 files changed, 47 insertions, 0 deletions
diff --git a/Master/Software Architektur/SWA_Prakt2/src/net/sven_eisenhauer/swa_prakt2/ExpressionIterator.java b/Master/Software Architektur/SWA_Prakt2/src/net/sven_eisenhauer/swa_prakt2/ExpressionIterator.java
new file mode 100644
index 0000000..0cdd7a8
--- /dev/null
+++ b/Master/Software Architektur/SWA_Prakt2/src/net/sven_eisenhauer/swa_prakt2/ExpressionIterator.java
@@ -0,0 +1,47 @@
+package net.sven_eisenhauer.swa_prakt1;
+
+public class ExpressionIterator implements ArithmeticIterator {
+	private ArithmeticExpression baseNode;
+	
+	public ExpressionIterator(ArithmeticExpression baseNode) {
+		this.baseNode = baseNode;
+	}
+
+	public void print() {
+		if(baseNode instanceof ArithmeticVariable) {
+			System.out.print(((ArithmeticVariable) baseNode).getName());
+		} else {
+			ArithmeticOperation actOperation = (ArithmeticOperation) baseNode;
+			ArithmeticIterator leftIter = new ExpressionIterator(actOperation.getLeftOperand());
+			ArithmeticIterator rightIter = new ExpressionIterator(actOperation.getRightOperand());
+			System.out.print("(");
+			leftIter.print();
+			System.out.print(actOperation.getOperationSign());
+			rightIter.print();
+			System.out.print(")");
+		}
+	}
+	
+	public Number evaluate() {
+		if(baseNode instanceof ArithmeticVariable) {
+			return ((ArithmeticVariable) baseNode).getValue();
+		} else {
+			ArithmeticOperation actOperation = (ArithmeticOperation) baseNode;
+			ArithmeticIterator leftIter = new ExpressionIterator(actOperation.getLeftOperand());
+			ArithmeticIterator rightIter = new ExpressionIterator(actOperation.getRightOperand());
+			Number leftVal = leftIter.evaluate();
+			Number rightVal = rightIter.evaluate();
+			if(actOperation instanceof ArithmeticAddition) {
+				return leftVal.doubleValue() + rightVal.doubleValue();
+			} else if(actOperation instanceof ArithmeticSubstraction) {
+				return leftVal.doubleValue() - rightVal.doubleValue();
+			} else if(actOperation instanceof ArithmeticDivision) {
+				return leftVal.doubleValue() / rightVal.doubleValue();
+			} else if(actOperation instanceof ArithmeticMultiplication) {
+				return leftVal.doubleValue() * rightVal.doubleValue();
+			} else {
+				return null;
+			}
+		}
+	}
+}