Rely on two types with if statements

* I worry about the simple constructors here though. I believe that
  causes things to be instantiated on the stack which is then blown
  away. That would mean that I would need to rely on the heap with
  the new keyword, but if I do that I will need to deallocate later.
* Digging into DS3232RTC, it looks like it has no deallocator, and I
  kind of suspect the same for Rtc_Pcf8563. Either way, we will want
  to ensure that we can delete those classes where we need to. I
  would hate to introduce a memory leak somewhere on something so
  small

src/WatchyRTC.cpp

@@ -14,21 +14,24 @@ bool WatchyRTC::_canConnectTo(int addr) {
 void WatchyRTC::init(){
     if (_canConnectTo(RTC_DS_ADDR)) {
         rtcType = DS3232_RTC_TYPE;
+        _rtc = DS3232();
         return;
     }
 
     if (_canConnectTo(RTC_PCF_ADDR)) {
         rtcType = PCF8563_RTC_TYPE;
+        _rtc = PCF8563();
         return;
     }
 
     rtcType = NO_RTC_TYPE;
+    _rtc = AbstractRTC();
 }
 
 void WatchyRTC::config(String datetime){
     if (rtcType == DS3232_RTC_TYPE)  {
         _DSConfig(datetime);
-    } else {
+    } else if (rtcType == PCF8563_RTC_TYPE) {
         _PCFConfig(datetime);
     }
 }
@@ -36,7 +39,7 @@ void WatchyRTC::config(String datetime){
 void WatchyRTC::clearAlarm(){
     if (rtcType == DS3232_RTC_TYPE) {
         rtc_ds.alarm(ALARM_2);
-    }else{
+    } else if (rtcType == PCF8563_RTC_TYPE) {
         int nextAlarmMinute = 0;
         rtc_pcf.clearAlarm(); //resets the alarm flag in the RTC
         nextAlarmMinute = rtc_pcf.getMinute();
@@ -49,7 +52,7 @@ void WatchyRTC::read(tmElements_t &tm){
     if (rtcType == DS3232_RTC_TYPE) {
         rtc_ds.read(tm);
         tm.Year = tm.Year - 30; //reset to offset from 2000
-    }else{
+    } else if (rtcType == PCF8563_RTC_TYPE) {
         tm.Month = rtc_pcf.getMonth();
         if(tm.Month == 0){ //PCF8563 POR sets month = 0 for some reason
             tm.Month = 1;
@@ -70,7 +73,7 @@ void WatchyRTC::set(tmElements_t tm){
         tm.Year = tm.Year + 2000 - YEAR_OFFSET_DS;
         time_t t = makeTime(tm);
         rtc_ds.set(t);
-    }else{
+    } else if (rtcType == PCF8563_RTC_TYPE) {
         rtc_pcf.setDate(tm.Day, _getDayOfWeek(tm.Day, tm.Month, tm.Year+YEAR_OFFSET_PCF), tm.Month, 0, tm.Year);
         rtc_pcf.setTime(tm.Hour, tm.Minute, tm.Second);
         clearAlarm();      
@@ -80,9 +83,9 @@ void WatchyRTC::set(tmElements_t tm){
 uint8_t WatchyRTC::temperature(){
     if (rtcType == DS3232_RTC_TYPE) {
         return rtc_ds.temperature();
-    }else{
-        return 255; //error
     }
+
+    return NO_TEMPERATURE_ERR;
 }
 
 void WatchyRTC::_DSConfig(String datetime){
@@ -116,6 +119,7 @@ void WatchyRTC::_PCFConfig(String datetime){
         //hr, min, sec
         rtc_pcf.setTime(Hour, Minute, Second);     
     }
+
     clearAlarm();
 }
 

src/WatchyRTC.h

@@ -24,6 +24,7 @@
 
 class AbstractRTC {
 public:
+    virtual ~AbstractRTC() {}
     virtual void config(String datetime) {}
     virtual void clearAlarm() {}
     virtual void read(tmElements_t &tm) {}
@@ -31,6 +32,18 @@ public:
     virtual uint8_t temperature() { return NO_TEMPERATURE_ERR; }
 };
 
+class DS3232 : public AbstractRTC {
+public:
+    DS3232RTC rtc_ds; // TODO: We should not have public member variables
+    ~DS3232() {}
+};
+
+class PCF8563 : public AbstractRTC {
+public:
+    Rtc_Pcf8563 rtc_pcf; // TODO: We should not have public member variables
+    ~PCF8563() {}
+};
+
 class WatchyRTC {
     public:
         DS3232RTC rtc_ds;