Merge pull request #920 from mapbox/fileSourceJava

Pulling In Initial Java FileSource Implementation

android/java/MapboxGLAndroidSDK/build.gradle

@@ -31,6 +31,7 @@ dependencies {
     compile 'commons-validator:commons-validator:1.4.1'
     compile 'com.android.support:support-annotations:21.0.3'
     compile 'com.android.support:support-v4:21.0.3'
+    compile 'com.squareup.okhttp:okhttp:2.2.0'
 }
 
 android {

android/java/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxgl/lib/constants/MapboxConstants.java

@@ -0,0 +1,10 @@
+package com.mapbox.mapboxgl.lib.constants;
+
+import java.util.Locale;
+
+public class MapboxConstants {
+
+    // Default Locale for data processing (ex: String.toLowerCase(MAPBOX_LOCALE, "foo"))
+    public static final Locale MAPBOX_LOCALE = Locale.US;
+
+}

android/java/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxgl/lib/util/JavaFileSource.java

@@ -0,0 +1,47 @@
+package com.mapbox.mapboxgl.lib.util;
+
+import com.mapbox.mapboxgl.lib.constants.MapboxConstants;
+import com.squareup.okhttp.Callback;
+import com.squareup.okhttp.OkHttpClient;
+import com.squareup.okhttp.Request;
+
+public class JavaFileSource {
+
+    private static JavaFileSource instance = null;
+
+    // Single reference to OkHttp for performance gains
+    private OkHttpClient client;
+
+    /**
+     * Private Constructor to support Singleton pattern
+     */
+    private JavaFileSource() {
+        super();
+        client = new OkHttpClient();
+    }
+
+    /**
+     * Get the singleton instance of JavaFileSource
+     * @return Reference to the Singleton Instance of JavaFileSource
+     */
+    public static JavaFileSource getInstance() {
+        if (instance == null) {
+            instance = new JavaFileSource();
+        }
+        return instance;
+    }
+
+    /**
+     * Make an HTTP Request
+     * @param resourceUrl URL to resource
+     * @param callback Callback class
+     */
+    public void request(final String resourceUrl, final Callback callback) {
+        Request request = new Request.Builder().url(resourceUrl).tag(resourceUrl.toLowerCase(MapboxConstants.MAPBOX_LOCALE)).build();
+        client.newCall(request).enqueue(callback);
+    }
+
+    public void cancel(final String resourceUrl) {
+        client.cancel(resourceUrl.toLowerCase(MapboxConstants.MAPBOX_LOCALE));
+    }
+}