content: /*
   * Copyright 2020, The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.example.android.testing.androidtestorchestratorsample;
  
  import static com.google.common.base.Preconditions.checkArgument;
  
  /**
   * A simple calculator with a basic set of operations.
   */
  public class Calculator {
  
      public enum Operator {ADD, SUB, DIV, MUL}
  
      /**
       * Addition operation
       */
      public double add(double firstOperand, double secondOperand) {
          return firstOperand + secondOperand;
      }
  
      /**
       * Substract operation
       */
      public double sub(double firstOperand, double secondOperand) {
          return firstOperand - secondOperand;
      }
  
      /**
       * Divide operation
       */
      public double div(double firstOperand, double secondOperand) {
          checkArgument(secondOperand != 0, "secondOperand must be != 0, you cannot divide by zero");
          return firstOperand / secondOperand;
      }
  
      /**
       * Multiply operation
       */
      public double mul(double firstOperand, double secondOperand) {
  
          return firstOperand * secondOperand;
      }
  }
  