added route singleton

app/src/main/java/com/a1/nextlocation/data/RouteHandler.java

@@ -0,0 +1,42 @@
+package com.a1.nextlocation.data;
+
+/**
+ * singleton to track the current route that is being followed
+ */
+public enum RouteHandler {
+    INSTANCE;
+
+    private boolean isFollowingRoute = false;
+    private Route currentRoute;
+    private int stepCount = 0;
+
+    public int getStepCount() {
+        return stepCount;
+    }
+
+    public void addStep() {
+        stepCount++;
+    }
+
+    public void finishRoute() {
+        stepCount = 0;
+        isFollowingRoute = false;
+        currentRoute = null;
+    }
+
+    public void followRoute(Route route) {
+        this.currentRoute = route;
+        setFollowingRoute(true);
+    }
+
+    public boolean isFollowingRoute(Route route) {
+        return isFollowingRoute && route.equals(currentRoute);
+    }
+    public void setFollowingRoute(boolean followingRoute) {
+        isFollowingRoute = followingRoute;
+    }
+
+    public boolean isFollowingRoute() {
+        return isFollowingRoute;
+    }
+}