App APIs in Pepper: C++ APIs

ppapi/cpp/dev/string_wrapper_dev.cc

+// Copyright (c) 2013 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 "ppapi/cpp/dev/string_wrapper_dev.h"
+
+#include "ppapi/cpp/logging.h"
+#include "ppapi/cpp/var.h"
+
+namespace pp {
+namespace internal {
+
+OptionalStringWrapper::OptionalStringWrapper() {
+}
+
+OptionalStringWrapper::OptionalStringWrapper(const std::string& value) {
+  *storage_ = Var(value).Detach();
+}
+
+OptionalStringWrapper::OptionalStringWrapper(PP_Var* storage, NotOwned)
+    : storage_(storage, NOT_OWNED) {

[dmichael (off chromium), 2013/12/20 22:01:09]

May be worth noting that while it does *not* own the PP_Var memory in this case,
this wrapper still owns a reference.

That confused me for a little bit.

[yzshen1, 2013/12/20 22:58:18]

Done. I added comments for .*StringWrapper and also Array<>.

+  PP_DCHECK(storage_->type == PP_VARTYPE_UNDEFINED);
+}
+
+OptionalStringWrapper::OptionalStringWrapper(
+    const OptionalStringWrapper& other) {
+  // Add one ref.
+  *storage_ = Var(*other.storage_).Detach();
+}
+
+OptionalStringWrapper::~OptionalStringWrapper() {
+  unset();
+}
+
+OptionalStringWrapper& OptionalStringWrapper::operator=(
+    const OptionalStringWrapper& other) {
+  return operator=(*other.storage_);
+}
+
+OptionalStringWrapper& OptionalStringWrapper::operator=(const PP_Var& other) {
+  if (storage_.get() == &other)
+    return *this;
+
+  Var auto_release(PASS_REF, *storage_);
+  // Add one ref.
+  *storage_ = Var(other).Detach();
+  return *this;
+}
+
+bool OptionalStringWrapper::is_set() const {
+  PP_DCHECK(storage_->type == PP_VARTYPE_STRING ||
+            storage_->type == PP_VARTYPE_UNDEFINED);
+  return storage_->type == PP_VARTYPE_STRING;
+}
+
+void OptionalStringWrapper::unset() {
+  Var auto_release(PASS_REF, *storage_);
+  *storage_ = PP_MakeUndefined();
+}
+
+std::string OptionalStringWrapper::get() const {
+  // TODO(yzshen): consider adding a cache.
+  Var var(*storage_);
+  if (var.is_string()) {
+    return var.AsString();
+  } else {
+    PP_NOTREACHED();
+    return std::string();
+  }
+}
+
+void OptionalStringWrapper::set(const std::string& value) {
+  Var auto_release(PASS_REF, *storage_);
+  *storage_ = Var(value).Detach();
+}
+
+PP_Var* OptionalStringWrapper::StartRawUpdate() {
+  unset();
+  return storage_.get();
+}
+
+void OptionalStringWrapper::EndRawUpdate() {
+  PP_DCHECK(storage_->type == PP_VARTYPE_STRING ||
+            storage_->type == PP_VARTYPE_UNDEFINED);
+}
+
+StringWrapper::StringWrapper() : storage_(std::string()) {
+}
+
+StringWrapper::StringWrapper(const std::string& value) : storage_(value) {
+}
+
+StringWrapper::StringWrapper(PP_Var* storage, NotOwned)
+    : storage_(storage, NOT_OWNED) {
+  storage_.set(std::string());
+}
+
+StringWrapper::StringWrapper(const StringWrapper& other)
+    : storage_(other.storage_) {
+}
+
+StringWrapper::~StringWrapper() {
+}
+
+StringWrapper& StringWrapper::operator=(const StringWrapper& other) {
+  storage_ = other.storage_;
+  return *this;
+}
+
+StringWrapper& StringWrapper::operator=(const PP_Var& other) {
+  PP_DCHECK(other.type == PP_VARTYPE_STRING);
+  storage_ = other;
+  return *this;
+}
+
+PP_Var* StringWrapper::StartRawUpdate() {
+  return storage_.StartRawUpdate();
+}
+
+void StringWrapper::EndRawUpdate() {
+  storage_.EndRawUpdate();
+  if (!storage_.is_set())
+    storage_.set(std::string());
+}
+
+}  // namespace internal
+}  // namespace pp