move default method to a utility class so that we can downgrade to java 7 (#876)

Author: osana

build.gradle

@@ -49,8 +49,8 @@ subprojects {
     }
   }
 
-  sourceCompatibility = "1.8"
-  targetCompatibility = "1.8"
+  sourceCompatibility = JavaVersion.VERSION_1_7
+  targetCompatibility = JavaVersion.VERSION_1_7
 
   dependencies {
 

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

@@ -71,6 +71,8 @@ public void testToFromJson1() {
       "heavy",
       "heavy");
 
+    List<LegStep> steps = new ArrayList<>();
+
     LegAnnotation annotation = LegAnnotation.builder()
       .congestion(new ArrayList<String>())
       .distance(distanceList)
@@ -84,7 +86,7 @@ public void testToFromJson1() {
       .distance(53.4)
       //.weight(14.3)
       .duration(14.3)
-      .steps(new ArrayList<>())
+      .steps(steps)
       .summary("")
       .build();
 

services-geojson/src/main/java/com/mapbox/geojson/Geometry.java

@@ -1,12 +1,5 @@
 package com.mapbox.geojson;
 
-import android.support.annotation.NonNull;
-
-import com.google.gson.GsonBuilder;
-import com.mapbox.geojson.gson.GeoJsonAdapterFactory;
-import com.mapbox.geojson.gson.GeometryDeserializer;
-import com.mapbox.geojson.gson.PointDeserializer;
-
 /**
  * Each of the six geometries and {@link GeometryCollection}
  * which make up GeoJson implement this interface.
@@ -15,20 +8,4 @@
  */
 public interface Geometry extends GeoJson {
 
-  /**
-   * Create a new instance of this class by passing in a formatted valid JSON String.
-   *
-   * @param json a formatted valid JSON string defining a GeoJson Geometry
-   * @return a new instance of this class defined by the values passed inside this static factory
-   *   method
-   * @since 3.0.0
-   */
-  static Geometry fromJson(@NonNull String json) {
-    GsonBuilder gson = new GsonBuilder();
-    gson.registerTypeAdapterFactory(GeoJsonAdapterFactory.create());
-    gson.registerTypeAdapter(Point.class, new PointDeserializer());
-    gson.registerTypeAdapter(Geometry.class, new GeometryDeserializer());
-    return gson.create().fromJson(json, Geometry.class);
-  }
-
 }

services-geojson/src/main/java/com/mapbox/geojson/gson/GeometryGeoJson.java

@@ -0,0 +1,30 @@
+package com.mapbox.geojson.gson;
+
+import android.support.annotation.NonNull;
+
+import com.google.gson.GsonBuilder;
+import com.mapbox.geojson.Geometry;
+import com.mapbox.geojson.Point;
+
+/**
+ * This is a utility class that helps create a Geometry instance from a JSON string.
+ * @since 3.5.0
+ */
+public class GeometryGeoJson {
+
+  /**
+   * Create a new instance of Geometry class by passing in a formatted valid JSON String.
+   *
+   * @param json a formatted valid JSON string defining a GeoJson Geometry
+   * @return a new instance of Geometry class defined by the values passed inside
+   *   this static factory method
+   * @since 3.5.0
+   */
+  public static Geometry fromJson(@NonNull String json) {
+    GsonBuilder gson = new GsonBuilder();
+    gson.registerTypeAdapterFactory(GeoJsonAdapterFactory.create());
+    gson.registerTypeAdapter(Point.class, new PointDeserializer());
+    gson.registerTypeAdapter(Geometry.class, new GeometryDeserializer());
+    return gson.create().fromJson(json, Geometry.class);
+  }
+}

services-geojson/src/test/java/com/mapbox/geojson/GeometryTest.java

@@ -1,6 +1,7 @@
 package com.mapbox.geojson;
 
 import com.mapbox.core.TestUtils;
+import com.mapbox.geojson.gson.GeometryGeoJson;
 
 import org.junit.Test;
 
@@ -15,7 +16,7 @@ public class GeometryTest extends TestUtils {
   @Test
   public void fromJson() throws IOException {
     final String json = loadJsonFixture(SAMPLE_GEOMETRY_COLLECTION);
-    Geometry geo = Geometry.fromJson(json);
+    Geometry geo = GeometryGeoJson.fromJson(json);
     assertEquals(geo.type(), "GeometryCollection");
   }
 }