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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /dom/svg/nsSVGAttrTearoffTable.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/svg/nsSVGAttrTearoffTable.h')
-rw-r--r--dom/svg/nsSVGAttrTearoffTable.h102
1 files changed, 102 insertions, 0 deletions
diff --git a/dom/svg/nsSVGAttrTearoffTable.h b/dom/svg/nsSVGAttrTearoffTable.h
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+++ b/dom/svg/nsSVGAttrTearoffTable.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/. */
+
+#ifndef NS_SVGATTRTEAROFFTABLE_H_
+#define NS_SVGATTRTEAROFFTABLE_H_
+
+#include "nsDataHashtable.h"
+#include "nsDebug.h"
+#include "nsHashKeys.h"
+
+/**
+ * Global hashmap to associate internal SVG data types (e.g. nsSVGLength2) with
+ * DOM tear-off objects (e.g. nsIDOMSVGLength). This allows us to always return
+ * the same object for subsequent requests for DOM objects.
+ *
+ * We don't keep an owning reference to the tear-off objects so they are
+ * responsible for removing themselves from this table when they die.
+ */
+template<class SimpleType, class TearoffType>
+class nsSVGAttrTearoffTable
+{
+public:
+#ifdef DEBUG
+ ~nsSVGAttrTearoffTable()
+ {
+ MOZ_ASSERT(!mTable, "Tear-off objects remain in hashtable at shutdown.");
+ }
+#endif
+
+ TearoffType* GetTearoff(SimpleType* aSimple);
+
+ void AddTearoff(SimpleType* aSimple, TearoffType* aTearoff);
+
+ void RemoveTearoff(SimpleType* aSimple);
+
+private:
+ typedef nsPtrHashKey<SimpleType> SimpleTypePtrKey;
+ typedef nsDataHashtable<SimpleTypePtrKey, TearoffType* > TearoffTable;
+
+ TearoffTable* mTable;
+};
+
+template<class SimpleType, class TearoffType>
+TearoffType*
+nsSVGAttrTearoffTable<SimpleType, TearoffType>::GetTearoff(SimpleType* aSimple)
+{
+ if (!mTable)
+ return nullptr;
+
+ TearoffType *tearoff = nullptr;
+
+#ifdef DEBUG
+ bool found =
+#endif
+ mTable->Get(aSimple, &tearoff);
+ MOZ_ASSERT(!found || tearoff,
+ "null pointer stored in attribute tear-off map");
+
+ return tearoff;
+}
+
+template<class SimpleType, class TearoffType>
+void
+nsSVGAttrTearoffTable<SimpleType, TearoffType>::AddTearoff(SimpleType* aSimple,
+ TearoffType* aTearoff)
+{
+ if (!mTable) {
+ mTable = new TearoffTable;
+ }
+
+ // We shouldn't be adding a tear-off if there already is one. If that happens,
+ // something is wrong.
+ if (mTable->Get(aSimple, nullptr)) {
+ MOZ_ASSERT(false, "There is already a tear-off for this object.");
+ return;
+ }
+
+ mTable->Put(aSimple, aTearoff);
+}
+
+template<class SimpleType, class TearoffType>
+void
+nsSVGAttrTearoffTable<SimpleType, TearoffType>::RemoveTearoff(
+ SimpleType* aSimple)
+{
+ if (!mTable) {
+ // Perhaps something happened in between creating the SimpleType object and
+ // registering it
+ return;
+ }
+
+ mTable->Remove(aSimple);
+ if (mTable->Count() == 0) {
+ delete mTable;
+ mTable = nullptr;
+ }
+}
+
+#endif // NS_SVGATTRTEAROFFTABLE_H_