Add toBuilder() method

services-directions-models/src/main/java/com/mapbox/api/directions/v5/WalkingOptions.java

@@ -1,6 +1,7 @@
 package com.mapbox.api.directions.v5;
 
 import androidx.annotation.FloatRange;
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.google.auto.value.AutoValue;
@@ -80,6 +81,17 @@ public final String toJson() {
     return gson.toJson(this, WalkingOptions.class);
   }
 
+  /**
+   * Convert the current {@link WalkingOptions} to its builder holding the currently assigned
+   * values. This allows you to modify a single property and then rebuild the object resulting in
+   * an updated and modified {@link WalkingOptions}.
+   *
+   * @return a {@link WalkingOptions.Builder} with the same values set to match the ones defined
+   *   in this {@link WalkingOptions}
+   */
+  @NonNull
+  public abstract Builder toBuilder();
+
   /**
    * Gson type adapter for parsing Gson to this class.
    *

services-directions-models/src/main/java/com/mapbox/api/directions/v5/models/RouteOptions.java

@@ -349,6 +349,17 @@ public static RouteOptions fromJson(String json) {
     return gson.create().fromJson(json, RouteOptions.class);
   }
 
+  /**
+   * Convert the current {@link RouteOptions} to its builder holding the currently assigned
+   * values. This allows you to modify a single property and then rebuild the object resulting in
+   * an updated and modified {@link RouteOptions}.
+   *
+   * @return a {@link RouteOptions.Builder} with the same values set to match the ones defined
+   *   in this {@link RouteOptions}
+   */
+  @NonNull
+  public abstract Builder toBuilder();
+
   /**
    * This builder can be used to set the values describing the {@link RouteOptions}.
    *

services-directions-models/src/test/java/com/mapbox/api/directions/v5/models/RouteOptionsTest.java

@@ -0,0 +1,52 @@
+package com.mapbox.api.directions.v5.models;
+
+import com.mapbox.geojson.Point;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class RouteOptionsTest {
+
+    @Test
+    public void toBuilder() {
+        RouteOptions routeOptions = routeOptions();
+
+        String language = "ru";
+        String url = "new_base_url";
+
+        RouteOptions updatedOptions = routeOptions.toBuilder()
+                .language(language)
+                .baseUrl(url)
+                .build();
+
+        assertEquals(language, updatedOptions.language());
+        assertEquals(url, updatedOptions.baseUrl());
+        assertEquals(routeOptions.accessToken(), updatedOptions.accessToken());
+        assertEquals(routeOptions.coordinates(), updatedOptions.coordinates());
+        assertEquals(routeOptions.user(), updatedOptions.user());
+        assertEquals(routeOptions.profile(), updatedOptions.profile());
+        assertEquals(routeOptions.geometries(), updatedOptions.geometries());
+        assertEquals(routeOptions.requestUuid(), updatedOptions.requestUuid());
+    }
+
+    private RouteOptions routeOptions() {
+        List<Point> coordinates = new ArrayList<>();
+        coordinates.add(Point.fromLngLat(1.0, 2.0));
+        coordinates.add(Point.fromLngLat(3.0, 4.0));
+
+        return RouteOptions.builder()
+                .accessToken("token")
+                .baseUrl("base_url")
+                .language("en")
+                .coordinates(coordinates)
+                .user("user")
+                .profile("profile")
+                .geometries("geometries")
+                .requestUuid("requestUuid")
+                .build();
+    }
+}

services-directions-models/src/test/java/com/mapbox/api/directions/v5/models/WalkingOptionsTest.java

@@ -37,6 +37,22 @@ public void fromJson() {
         assertEquals(Double.valueOf(0.7), walkingOptions.alleyBias());
     }
 
+    @Test
+    public void toBuilder() {
+        WalkingOptions walkingOptions = walkingOptions();
+
+        double delta = 0;
+        double newSpeed = 2.0;
+
+        WalkingOptions updatedOptions = walkingOptions.toBuilder()
+                .walkingSpeed(newSpeed)
+                .build();
+
+        assertEquals(newSpeed, updatedOptions.walkingSpeed(), delta);
+        assertEquals(walkingOptions.walkwayBias(), updatedOptions.walkwayBias(), delta);
+        assertEquals(walkingOptions.alleyBias(), updatedOptions.alleyBias(), delta);
+    }
+
     private WalkingOptions walkingOptions() {
         return WalkingOptions.builder()
                 .walkingSpeed(1.0)