[Media Router] Add MediaSink subtypes

chrome/browser/media/router/typed_media_sink.cc

+// Copyright 2017 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 "chrome/browser/media/router/typed_media_sink.h"
+
+#include "base/logging.h"
+
+namespace media_router {
+
+TypedMediaSink::TypedMediaSink(const MediaSink::Id& sink_id,
+                               const std::string& name,
+                               const MediaSink::IconType icon_type)
+    : TypedMediaSink() {
+  sink_ = MediaSink(sink_id, name, icon_type);
+}
+
+TypedMediaSink::TypedMediaSink()
+    : type_(SinkType::UNKNOWN), dial_sink_extra_data_(DialSinkExtraData()) {}

[imcheng, 2017/02/11 01:00:22]

Did you need to initialize dial_sink_extra_data_ here to avoid compile error?

[zhaobin, 2017/02/14 02:08:49]

Unit test crashes if we do not init DialSinkExtraData. GURL operator= uses a
swap. dial_sink_extra_data_.app_url is invalid memory if we do not initialize it
here...

+
+TypedMediaSink::~TypedMediaSink() {}
+
+TypedMediaSink& TypedMediaSink::operator=(const TypedMediaSink& other) {
+  sink_ = other.sink_;
+  ip_address_ = other.ip_address_;
+  model_name_ = other.model_name_;
+  type_ = other.type_;
+
+  if (other.is_dial_sink())
+    dial_sink_extra_data_ = other.dial_sink_extra_data_;
+  if (other.is_cast_sink())
+    cast_sink_extra_data_ = other.cast_sink_extra_data_;
+
+  return *this;
+}
+
+void TypedMediaSink::set_dial_sink_extra_data(
+    const DialSinkExtraData& dial_sink_extra_data) {
+  DCHECK_EQ(type_, SinkType::UNKNOWN);

[imcheng, 2017/02/11 01:00:22]

Why do we need these DCHECKs? It seems perfectly legal to overwrite the extra
data as long as we are doing so consistently.

[zhaobin, 2017/02/14 02:08:49]

Done.

+  type_ = SinkType::DIAL;
+  dial_sink_extra_data_ = dial_sink_extra_data;
+}
+
+const DialSinkExtraData* TypedMediaSink::dial_sink_extra_data() const {

[imcheng, 2017/02/11 01:00:22]

Suggest making these return const ref, and turn the if statement into a CHECK.

[zhaobin, 2017/02/14 02:08:49]

Done.

+  if (!is_dial_sink())
+    return nullptr;
+
+  return &dial_sink_extra_data_;
+}
+
+void TypedMediaSink::set_cast_sink_extra_data(
+    const CastSinkExtraData& cast_sink_extra_data) {
+  DCHECK_EQ(type_, SinkType::UNKNOWN);
+  type_ = SinkType::CAST;
+  cast_sink_extra_data_ = cast_sink_extra_data;
+}
+
+const CastSinkExtraData* TypedMediaSink::cast_sink_extra_data() const {
+  if (!is_cast_sink())
+    return nullptr;
+
+  return &cast_sink_extra_data_;
+}
+
+}  // namespace media_router