interface changes

added new data-strcutures for new sensors
new helper methods
fixed some issues

data/HistoryTS.h

@@ -0,0 +1,68 @@
+#ifndef HISTORYTS_H
+#define HISTORYTS_H
+
+#include <vector>
+#include "Timestamp.h"
+#include <algorithm>
+
+/**
+ * keep the history of values for a given amount of time
+ */
+template <typename T> class HistoryTS {
+
+private:
+
+	/** timestamp -> value combination */
+	struct Entry {
+		Timestamp ts;
+		T value;
+		Entry(const Timestamp ts, const T& value) : ts(ts), value(value) {;}
+	};
+
+	/** the time-window to keep */
+	Timestamp window;
+
+	/** the value history for the window-size */
+	std::vector<Entry> history;
+
+public:
+
+
+	/** ctor with the time-window to keep */
+	HistoryTS(const Timestamp window) : window(window) {
+
+	}
+
+	/** add a new entry */
+	void add(const Timestamp ts, const T& data) {
+
+		// append to history
+		history.push_back(Entry(ts, data));
+
+		// remove too-old history entries
+		const Timestamp oldest = ts - window;
+		while(history.front().ts < oldest) {
+
+			// remove from history
+			history.erase(history.begin());
+
+		}
+
+	}
+
+	/** get the most recent entry */
+	T getMostRecent() const {
+		return history.back().value;
+	}
+
+	/** get the oldest entry available */
+	T getOldest() const {
+		return history.front().value;
+	}
+
+
+
+};
+
+
+#endif // HISTORYTS_H