1 files changed, 49 insertions, 0 deletions
diff --git a/dom/midi/MIDIOutputMap.h b/dom/midi/MIDIOutputMap.h
new file mode 100644
index 0000000000..2e33e8b2a7
--- /dev/null
+++ b/dom/midi/MIDIOutputMap.h
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_MIDIOutputMap_h
+#define mozilla_dom_MIDIOutputMap_h
+
+#include "mozilla/dom/MIDIPort.h"
+#include "nsCOMPtr.h"
+#include "nsTHashMap.h"
+#include "nsWrapperCache.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla::dom {
+
+/**
+ * Maplike DOM object that holds a list of all MIDI output ports available for
+ * access. Almost all functions are implemented automatically by WebIDL.
+ *
+ */
+class MIDIOutputMap final : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(MIDIOutputMap)
+
+  explicit MIDIOutputMap(nsPIDOMWindowInner* aParent);
+
+  nsPIDOMWindowInner* GetParentObject() const { return mParent; }
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+  bool Has(nsAString& aId) { return mPorts.Get(aId) != nullptr; }
+  void Insert(nsAString& aId, RefPtr<MIDIPort> aPort) {
+    mPorts.InsertOrUpdate(aId, aPort);
+  }
+  void Remove(nsAString& aId) { mPorts.Remove(aId); }
+
+ private:
+  ~MIDIOutputMap() = default;
+  nsTHashMap<nsString, RefPtr<MIDIPort>> mPorts;
+  nsCOMPtr<nsPIDOMWindowInner> mParent;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_MIDIOutputMap_h