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-rw-r--r--dom/bindings/MozMap.h121
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diff --git a/dom/bindings/MozMap.h b/dom/bindings/MozMap.h
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+/* -*- 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/. */
+
+/**
+ * Class for representing MozMap arguments. This is an nsTHashtable
+ * under the hood, but we don't want to leak that implementation
+ * detail.
+ */
+
+#ifndef mozilla_dom_MozMap_h
+#define mozilla_dom_MozMap_h
+
+#include "nsTHashtable.h"
+#include "nsHashKeys.h"
+#include "nsStringGlue.h"
+#include "nsTArray.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Move.h"
+
+namespace mozilla {
+namespace dom {
+
+namespace binding_detail {
+template<typename DataType>
+class MozMapEntry : public nsStringHashKey
+{
+public:
+ explicit MozMapEntry(const nsAString* aKeyTypePointer)
+ : nsStringHashKey(aKeyTypePointer)
+ {
+ }
+
+ // Move constructor so we can do MozMaps of MozMaps.
+ MozMapEntry(MozMapEntry<DataType>&& aOther)
+ : nsStringHashKey(aOther),
+ mData(Move(aOther.mData))
+ {
+ }
+
+ DataType mData;
+};
+
+} // namespace binding_detail
+
+template<typename DataType>
+class MozMap : protected nsTHashtable<binding_detail::MozMapEntry<DataType>>
+{
+public:
+ typedef typename binding_detail::MozMapEntry<DataType> EntryType;
+ typedef nsTHashtable<EntryType> Base;
+ typedef MozMap<DataType> SelfType;
+
+ MozMap()
+ {
+ }
+
+ // Move constructor so we can do MozMap of MozMap.
+ MozMap(SelfType&& aOther) :
+ Base(Move(aOther))
+ {
+ }
+
+ // The return value is only safe to use until an AddEntry call.
+ const DataType& Get(const nsAString& aKey) const
+ {
+ const EntryType* ent = this->GetEntry(aKey);
+ MOZ_ASSERT(ent, "Why are you using a key we didn't claim to have?");
+ return ent->mData;
+ }
+
+ DataType& Get(const nsAString& aKey)
+ {
+ EntryType* ent = this->GetEntry(aKey);
+ MOZ_ASSERT(ent, "Why are you using a key we didn't claim to have?");
+ return ent->mData;
+ }
+
+ // The return value is only safe to use until an AddEntry call.
+ const DataType* GetIfExists(const nsAString& aKey) const
+ {
+ const EntryType* ent = this->GetEntry(aKey);
+ if (!ent) {
+ return nullptr;
+ }
+ return &ent->mData;
+ }
+
+ void GetKeys(nsTArray<nsString>& aKeys) const {
+ for (auto iter = this->ConstIter(); !iter.Done(); iter.Next()) {
+ aKeys.AppendElement(iter.Get()->GetKey());
+ }
+ }
+
+ // XXXbz we expose this generic enumerator for tracing. Otherwise we'd end up
+ // with a dependency on BindingUtils.h here for the SequenceTracer bits.
+ typedef void (* Enumerator)(DataType* aValue, void* aClosure);
+ void EnumerateValues(Enumerator aEnumerator, void *aClosure)
+ {
+ for (auto iter = this->Iter(); !iter.Done(); iter.Next()) {
+ aEnumerator(&iter.Get()->mData, aClosure);
+ }
+ }
+
+ MOZ_MUST_USE
+ DataType* AddEntry(const nsAString& aKey)
+ {
+ EntryType* ent = this->PutEntry(aKey, fallible);
+ if (!ent) {
+ return nullptr;
+ }
+ return &ent->mData;
+ }
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_MozMap_h