Import chromium-63.0.3239.132

base/android/scoped_java_ref.cc

@@ -0,0 +1,92 @@
+// Copyright (c) 2012 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/scoped_java_ref.h"
+
+#include "base/android/jni_android.h"
+#include "base/logging.h"
+
+namespace base {
+namespace android {
+namespace {
+
+const int kDefaultLocalFrameCapacity = 16;
+
+}  // namespace
+
+ScopedJavaLocalFrame::ScopedJavaLocalFrame(JNIEnv* env) : env_(env) {
+  int failed = env_->PushLocalFrame(kDefaultLocalFrameCapacity);
+  DCHECK(!failed);
+}
+
+ScopedJavaLocalFrame::ScopedJavaLocalFrame(JNIEnv* env, int capacity)
+    : env_(env) {
+  int failed = env_->PushLocalFrame(capacity);
+  DCHECK(!failed);
+}
+
+ScopedJavaLocalFrame::~ScopedJavaLocalFrame() {
+  env_->PopLocalFrame(nullptr);
+}
+
+#if DCHECK_IS_ON()
+// This constructor is inlined when DCHECKs are disabled; don't add anything
+// else here.
+JavaRef<jobject>::JavaRef(JNIEnv* env, jobject obj) : obj_(obj) {
+  if (obj) {
+    DCHECK(env && env->GetObjectRefType(obj) == JNILocalRefType);
+  }
+}
+#endif
+
+JNIEnv* JavaRef<jobject>::SetNewLocalRef(JNIEnv* env, jobject obj) {
+  if (!env) {
+    env = AttachCurrentThread();
+  } else {
+    DCHECK_EQ(env, AttachCurrentThread());  // Is |env| on correct thread.
+  }
+  if (obj)
+    obj = env->NewLocalRef(obj);
+  if (obj_)
+    env->DeleteLocalRef(obj_);
+  obj_ = obj;
+  return env;
+}
+
+void JavaRef<jobject>::SetNewGlobalRef(JNIEnv* env, jobject obj) {
+  if (!env) {
+    env = AttachCurrentThread();
+  } else {
+    DCHECK_EQ(env, AttachCurrentThread());  // Is |env| on correct thread.
+  }
+  if (obj)
+    obj = env->NewGlobalRef(obj);
+  if (obj_)
+    env->DeleteGlobalRef(obj_);
+  obj_ = obj;
+}
+
+void JavaRef<jobject>::ResetLocalRef(JNIEnv* env) {
+  if (obj_) {
+    DCHECK_EQ(env, AttachCurrentThread());  // Is |env| on correct thread.
+    env->DeleteLocalRef(obj_);
+    obj_ = nullptr;
+  }
+}
+
+void JavaRef<jobject>::ResetGlobalRef() {
+  if (obj_) {
+    AttachCurrentThread()->DeleteGlobalRef(obj_);
+    obj_ = nullptr;
+  }
+}
+
+jobject JavaRef<jobject>::ReleaseInternal() {
+  jobject obj = obj_;
+  obj_ = nullptr;
+  return obj;
+}
+
+}  // namespace android
+}  // namespace base