Add missing classes

app/include/fan/Aggregators.h

@@ -0,0 +1,27 @@
+#ifndef AGGREGATORS_H_
+#define AGGREGATORS_H_
+
+#include <sensor/Sensor.h>
+
+class Aggregator
+{
+public:
+  virtual int aggregate(std::vector<std::shared_ptr<Sensor>> sensors) const = 0;
+  virtual const std::string toString() const = 0;
+};
+
+class AverageAggregator : public Aggregator
+{
+public:
+  int aggregate(std::vector<std::shared_ptr<Sensor>> sensors) const override;
+  const std::string toString() const override;
+};
+
+class MaxAggregator : public Aggregator
+{
+public:
+  int aggregate(std::vector<std::shared_ptr<Sensor>> sensors) const override;
+  const std::string toString() const override;
+};
+
+#endif // AGGERGATORS_H_

app/src/fan/Aggregators.cxx

@@ -0,0 +1,39 @@
+#include <climits>
+#include <fan/Aggregators.h>
+
+int
+AverageAggregator::aggregate(std::vector<std::shared_ptr<Sensor>> sensors) const
+{
+  int sum = 0;
+
+  for (auto sensor : sensors) {
+    sum += sensor->value();
+  }
+
+  return sum / sensors.size();
+}
+
+const std::string
+AverageAggregator::toString() const
+{
+  return "Average";
+}
+
+int
+MaxAggregator::aggregate(std::vector<std::shared_ptr<Sensor>> sensors) const
+{
+  int max = INT_MIN;
+
+  for (auto sensor : sensors) {
+    if (sensor->value() > max)
+      max = sensor->value();
+  }
+
+  return max;
+}
+
+const std::string
+MaxAggregator::toString() const
+{
+  return "Max";
+}