Add AutoJObject and AutoGlobalJObject

base/android/auto_global_jobject.cc

+// 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.
+
+#include "base/android/auto_global_jobject.h"
+
+#include <stddef.h>
+
+namespace base {
+namespace android {
+
+AutoGlobalJObject::AutoGlobalJObject()
+    : env_(NULL),
+      obj_(NULL) {
+}
+
+AutoGlobalJObject::AutoGlobalJObject(const AutoJObject& obj)
+    : env_(obj.env()),
+      obj_(obj.env()->NewGlobalRef(obj.obj())) {
+}
+
+AutoGlobalJObject::~AutoGlobalJObject() {
+  Reset();
+}
+
+void AutoGlobalJObject::Reset() {
+  if (env_ && obj_)
+    env_->DeleteGlobalRef(obj_);
+  env_ = NULL;
+  obj_ = NULL;
+}
+
+void AutoGlobalJObject::Reset(const AutoGlobalJObject& other) {
+  Reset();
+  env_ = other.env_;
+  obj_ = other.env_ ? other.env_->NewGlobalRef(other.obj_) : NULL;
+}
+
+}  // namespace android
+}  // namespace base