Add AutoJObject and AutoGlobalJObject

base/android/auto_global_jobject.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_ANDROID_AUTO_GLOBAL_JOBJECT_H_
+#define BASE_ANDROID_AUTO_GLOBAL_JOBJECT_H_
+
+#include <jni.h>
+
+#include "base/android/auto_jobject.h"
+
+namespace base {
+namespace android {
+
+// A global reference to a Java object which is cleaned up automatically when
+// this object gets deleted.
+class AutoGlobalJObject {
+ public:
+  // Takes ownership of |obj|.
+  static AutoGlobalJObject FromLocalRef(JNIEnv* env, jobject obj);
+
+  AutoGlobalJObject();
+  AutoGlobalJObject(const AutoGlobalJObject& other);
+  explicit AutoGlobalJObject(const AutoJObject& obj);
+  ~AutoGlobalJObject();
+
+  void Reset();
+  void Reset(const AutoGlobalJObject& other);
+  jobject obj() const;
+
+ private:
+  // Not permitted.
+  AutoGlobalJObject& operator=(const AutoGlobalJObject& other);
+
+  JNIEnv* env_;
+  jobject obj_;
+};
+
+}  // namespace android
+}  // namespace base
+
+#endif  // BASE_ANDROID_AUTO_GLOBAL_JOBJECT_H_