DataDictionary.Interpreter.BinaryExpression.CombineGraph C# (CSharp) Method

        private IGraph CombineGraph(IGraph leftGraph, IGraph rightGraph)
        {
            IGraph retVal = null;

            switch (Operation)
            {
                case Operator.Add:
                    retVal = leftGraph.AddGraph(rightGraph);
                    break;

                case Operator.Sub:
                    retVal = leftGraph.SubstractGraph(rightGraph);
                    break;

                case Operator.Mult:
                    retVal = leftGraph.MultGraph(rightGraph);
                    break;

                case Operator.Div:
                    retVal = leftGraph.DivGraph(rightGraph);
                    break;
            }

            return retVal;
        }