Implement WebBluetooth getDescriptor[s]

third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTDescriptor.h

+// Copyright 2016 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 BluetoothRemoteGATTDescriptor_h
+#define BluetoothRemoteGATTDescriptor_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ActiveDOMObject.h"
+#include "core/dom/DOMArrayPiece.h"
+#include "core/dom/DOMDataView.h"
+#include "modules/EventTargetModules.h"
+#include "modules/bluetooth/BluetoothRemoteGATTCharacteristic.h"
+#include "modules/bluetooth/BluetoothRemoteGATTService.h"
+#include "platform/heap/Handle.h"
+#include "public/platform/modules/bluetooth/WebBluetoothRemoteGATTCharacteristic.h"
+#include "public/platform/modules/bluetooth/WebBluetoothRemoteGATTDescriptorInit.h"
+#include "wtf/text/WTFString.h"
+#include <memory>
+
+namespace blink {
+
+class BluetoothRemoteGATTCharacteristic;
+class ScriptPromise;
+class ScriptState;
+
+// BluetoothRemoteGATTDescriptor represents a GATT Descriptor, which is
+// a basic data element that provides further information about a peripheral's
+// characteristic.
+class BluetoothRemoteGATTDescriptor final
+    : public GarbageCollectedFinalized<BluetoothRemoteGATTDescriptor>,
+      public ScriptWrappable {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  BluetoothRemoteGATTDescriptor(
+      std::unique_ptr<WebBluetoothRemoteGATTDescriptorInit>,
+      BluetoothRemoteGATTCharacteristic*);
+
+  static BluetoothRemoteGATTDescriptor* create(
+      std::unique_ptr<WebBluetoothRemoteGATTDescriptorInit>,
+      BluetoothRemoteGATTCharacteristic*);
+
+  // IDL exposed interface:
+  BluetoothRemoteGATTCharacteristic* characteristic() {
+    return m_characteristic;
+  }
+  String uuid() { return m_webDescriptor->uuid; }
+  DOMDataView* value() const { return m_value; }
+  ScriptPromise readValue(ScriptState*);
+  ScriptPromise writeValue(ScriptState*, const DOMArrayPiece&);
+
+  // Interface required by garbage collection.
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  friend class DescriptorReadValueCallback;
+
+  BluetoothRemoteGATTServer* getGatt() { return m_characteristic->gatt(); }
+
+  std::unique_ptr<WebBluetoothRemoteGATTDescriptorInit> m_webDescriptor;
+  Member<BluetoothRemoteGATTCharacteristic> m_characteristic;
+  Member<DOMDataView> m_value;
+};
+
+}  // namespace blink
+
+#endif  // BluetoothRemoteGATTDescriptor_h