adds validation utils class (#424)

mapbox · Oct 25, 2017 · 4f872e2 · 4f872e2
1 parent 7d1375f
commit 4f872e2
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diff --git a/.../src/main/java/com/mapbox/services/android/navigation/v5/navigation/MapboxNavigation.java b/.../src/main/java/com/mapbox/services/android/navigation/v5/navigation/MapboxNavigation.java
@@ -25,6 +25,7 @@
 import com.mapbox.services.android.navigation.v5.routeprogress.RouteProgress;
 import com.mapbox.services.android.navigation.v5.snap.Snap;
 import com.mapbox.services.android.navigation.v5.snap.SnapToRoute;
+import com.mapbox.services.android.navigation.v5.utils.ValidationUtils;
 import com.mapbox.services.android.telemetry.MapboxEvent;
 import com.mapbox.services.android.telemetry.MapboxTelemetry;
 import com.mapbox.services.android.telemetry.location.LocationEngine;
@@ -353,6 +354,7 @@ public LocationEngine getLocationEngine() {
    * @since 0.1.0
    */
   public void startNavigation(@NonNull DirectionsRoute directionsRoute) {
+    ValidationUtils.validDirectionsRoute(directionsRoute, options.defaultMilestonesEnabled());
     this.directionsRoute = directionsRoute;
     Timber.d("MapboxNavigation startNavigation called.");
     if (!isBound) {

diff --git a/...gation/src/main/java/com/mapbox/services/android/navigation/v5/utils/ValidationUtils.java b/...gation/src/main/java/com/mapbox/services/android/navigation/v5/utils/ValidationUtils.java
@@ -0,0 +1,20 @@
+package com.mapbox.services.android.navigation.v5.utils;
+
+import com.mapbox.directions.v5.models.DirectionsRoute;
+
+import java.util.MissingFormatArgumentException;
+
+public final class ValidationUtils {
+
+  private ValidationUtils() {
+    // Class should not be initialized.
+  }
+
+  public static void validDirectionsRoute(DirectionsRoute directionsRoute,
+                                          boolean defaultMilestonesEnabled) {
+    if (!directionsRoute.routeOptions().voiceInstructions() && defaultMilestonesEnabled) {
+      throw new MissingFormatArgumentException("Using the default milestone requires the "
+        + "directions route to include the voice instructions object.");
+    }
+  }
+}