1 files changed, 80 insertions, 0 deletions
diff --git a/xpcom/ds/nsHashPropertyBag.h b/xpcom/ds/nsHashPropertyBag.h
new file mode 100644
index 0000000000..7a2e6b0ac8
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+++ b/xpcom/ds/nsHashPropertyBag.h
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 nsHashPropertyBag_h___
+#define nsHashPropertyBag_h___
+
+#include "nsIVariant.h"
+#include "nsIWritablePropertyBag.h"
+#include "nsIWritablePropertyBag2.h"
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsInterfaceHashtable.h"
+
+class nsHashPropertyBagBase : public nsIWritablePropertyBag,
+                              public nsIWritablePropertyBag2 {
+ public:
+  nsHashPropertyBagBase() = default;
+
+  void CopyFrom(const nsHashPropertyBagBase* aOther);
+  void CopyFrom(nsIPropertyBag* aOther);
+  static void CopyFrom(nsIWritablePropertyBag* aTo, nsIPropertyBag* aFrom);
+
+  NS_DECL_NSIPROPERTYBAG
+  NS_DECL_NSIPROPERTYBAG2
+
+  NS_DECL_NSIWRITABLEPROPERTYBAG
+  NS_DECL_NSIWRITABLEPROPERTYBAG2
+
+ protected:
+  // a hash table of string -> nsIVariant
+  nsInterfaceHashtable<nsStringHashKey, nsIVariant> mPropertyHash;
+};
+
+class nsHashPropertyBag : public nsHashPropertyBagBase {
+ public:
+  nsHashPropertyBag() = default;
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+ protected:
+  virtual ~nsHashPropertyBag();
+};
+
+/*
+ * Off Main Thread variant of nsHashPropertyBag. Instances of this class
+ * should not be created on a main thread, nor should it contain main thread
+ * only objects, such as XPCVariants. The purpose of this class is to provide a
+ * way to use the property bag off main thread.
+ * Note: this class needs to be created and destroyed on the same thread and
+ * should be used single threaded.
+ */
+class nsHashPropertyBagOMT final : public nsHashPropertyBagBase {
+ public:
+  nsHashPropertyBagOMT();
+  NS_DECL_ISUPPORTS
+
+ protected:
+  // Doesn't need to dispatch to main thread because it cannot contain
+  // XPCVariants
+  virtual ~nsHashPropertyBagOMT() = default;
+};
+
+/* A cycle collected nsHashPropertyBag for main-thread-only use. */
+class nsHashPropertyBagCC final : public nsHashPropertyBagBase {
+ public:
+  nsHashPropertyBagCC() = default;
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsHashPropertyBagCC,
+                                           nsIWritablePropertyBag)
+ protected:
+  virtual ~nsHashPropertyBagCC() = default;
+};
+
+inline nsISupports* ToSupports(nsHashPropertyBagBase* aPropertyBag) {
+  return static_cast<nsIWritablePropertyBag*>(aPropertyBag);
+}
+
+#endif /* nsHashPropertyBag_h___ */