Add Kotlin feature for ObjectWrapper

.travis.yml

@@ -9,9 +9,7 @@ android:
   components:
   - tools
   - platform-tools
-  - build-tools-27.0.3
-  - android-27
+  - build-tools-28.0.3
+  - android-28
   - extra-android-m2repository
-before_install:
- - yes | sdkmanager "platforms;android-27"
 

build.gradle

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2016 microG Project Team
+ * Copyright 2013-2019 microG Project Team
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,7 @@
  */
 
 buildscript {
+    ext.kotlin_version = '1.3.21'
     repositories {
         jcenter()
         google()
@@ -22,19 +23,20 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:3.1.3'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 
 allprojects {
     apply plugin: 'idea'
-    ext.androidBuildVersionTools = "27.0.3"
+    ext.androidBuildVersionTools = "28.0.3"
 }
 
-def androidCompileSdk() { return 27 }
+def androidCompileSdk() { return 28 }
 
-def androidTargetSdk() { return 27 }
+def androidTargetSdk() { return 28 }
 
-def androidMinSdk() { return 9 }
+def androidMinSdk() { return 14 }
 
 subprojects {
     repositories {

play-services-basement/build.gradle

@@ -15,6 +15,8 @@
  */
 
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-android'
 
 String getMyVersionName() {
     def stdout = new ByteArrayOutputStream()
@@ -43,6 +45,10 @@ android {
         targetSdkVersion androidTargetSdk()
     }
 
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
@@ -52,4 +58,5 @@ android {
 dependencies {
     api 'com.android.support:support-v4:25.3.1'
     api 'org.microg:safe-parcel:1.5.0'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }

play-services-basement/src/main/java/com/google/android/gms/dynamic/ObjectWrapper.java

@@ -17,6 +17,7 @@
 package com.google.android.gms.dynamic;
 
 import android.os.IBinder;
+import android.support.annotation.Nullable;
 
 import java.lang.reflect.Field;
 
@@ -27,6 +28,7 @@ public class ObjectWrapper<T> extends IObjectWrapper.Stub {
         this.t = t;
     }
 
+    @Nullable
     public static Object unwrap(IObjectWrapper obj) {
         if (obj == null) {
             return null;
@@ -43,8 +45,7 @@ public class ObjectWrapper<T> extends IObjectWrapper.Stub {
         if (!field.isAccessible()) {
             field.setAccessible(true);
             try {
-                Object wrapped = field.get(binder);
-                return wrapped;
+                return field.get(binder);
             } catch (NullPointerException localNullPointerException) {
                 throw new IllegalArgumentException("Binder object is null.",
                         localNullPointerException);
@@ -60,6 +61,15 @@ public class ObjectWrapper<T> extends IObjectWrapper.Stub {
         }
     }
 
+    @Nullable
+    public static <T> T unwrapTyped(IObjectWrapper obj, Class<T> clazz) {
+        try {
+            return clazz.cast(unwrap(obj));
+        } catch (ClassCastException e) {
+            return null;
+        }
+    }
+
     public static <T> ObjectWrapper<T> wrap(T t) {
         return new ObjectWrapper<T>(t);
     }

play-services-basement/src/main/kotlin/com/google/android/gms/dynamic/ObjectWrapper.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2019 microG Project Team
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.microg.gms.kotlin
+
+import com.google.android.gms.dynamic.IObjectWrapper
+import com.google.android.gms.dynamic.ObjectWrapper
+
+inline fun <reified T> IObjectWrapper?.unwrap(): T? = ObjectWrapper.unwrapTyped(this, T::class.java)