Added iWater interface

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@gmail.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

include/interfaces/iWater.hpp

@@ -0,0 +1,45 @@
+/*
+ * Author: Stefan Andritoiu <stefan.andritoiu@gmail.com>
+ * Copyright (c) 2018 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+namespace upm
+{
+/**
+ * @brief Interface for Water sensors
+*/
+  class iWater
+  {
+  public:
+    virtual ~iWater() {}
+
+    /**
+     * Gets the water (wet/not wet) value from the sensor
+     *
+     * @return True if the sensor is wet, false otherwise
+     */
+    virtual bool isWet() = 0;
+
+  };
+}

src/water/water.hpp

@@ -25,6 +25,7 @@
 
 #include <string>
 #include "water.h"
+#include <interfaces/iWater.hpp>
 
 namespace upm {
   /**
@@ -49,7 +50,7 @@ namespace upm {
    * @image html water.jpg
    * @snippet water.cxx Interesting
    */
-  class Water {
+  class Water : virtual public iWater {
   public:
     /**
      * digital water sensor constructor
@@ -66,7 +67,7 @@ namespace upm {
      *
      * @return True if the sensor is wet, false otherwise
      */
-    bool isWet();
+    virtual bool isWet();
 
   private:
     /* Disable implicit copy and assignment operators */