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diff --git a/accessible/windows/ia2/ia2AccessibleRelation.h b/accessible/windows/ia2/ia2AccessibleRelation.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=2:tabstop=2:
+ */
+/* 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_ACCESSIBLE_RELATION_WRAP_H
+#define _NS_ACCESSIBLE_RELATION_WRAP_H
+
+#include "MsaaAccessible.h"
+#include "IUnknownImpl.h"
+
+#include <utility>
+#include "nsTArray.h"
+
+#include "mozilla/a11y/RelationType.h"
+#include "mozilla/a11y/Accessible.h"
+#include "AccessibleRelation.h"
+
+namespace mozilla {
+namespace a11y {
+
+class ia2AccessibleRelation final : public IAccessibleRelation {
+ public:
+ ia2AccessibleRelation(RelationType aType, Relation* aRel);
+
+ // IUnknown
+ DECL_IUNKNOWN
+
+ // IAccessibleRelation
+ virtual /* [propget] */ HRESULT STDMETHODCALLTYPE get_relationType(
+ /* [retval][out] */ BSTR* relationType);
+
+ virtual /* [propget] */ HRESULT STDMETHODCALLTYPE get_localizedRelationType(
+ /* [retval][out] */ BSTR* localizedRelationType);
+
+ virtual /* [propget] */ HRESULT STDMETHODCALLTYPE get_nTargets(
+ /* [retval][out] */ long* nTargets);
+
+ virtual /* [propget] */ HRESULT STDMETHODCALLTYPE get_target(
+ /* [in] */ long targetIndex,
+ /* [retval][out] */ IUnknown** target);
+
+ virtual /* [propget] */ HRESULT STDMETHODCALLTYPE get_targets(
+ /* [in] */ long maxTargets,
+ /* [length_is][size_is][out] */ IUnknown** target,
+ /* [retval][out] */ long* nTargets);
+
+ inline bool HasTargets() const { return mTargets.Length(); }
+
+ private:
+ ia2AccessibleRelation();
+ ia2AccessibleRelation(const ia2AccessibleRelation&);
+ ia2AccessibleRelation& operator=(const ia2AccessibleRelation&);
+
+ RelationType mType;
+ nsTArray<RefPtr<IUnknown>> mTargets;
+};
+
+/**
+ * Gecko to IAccessible2 relation types map.
+ */
+
+const WCHAR* const IA2_RELATION_NULL = L"";
+
+#define RELATIONTYPE(geckoType, name, atkType, msaaType, ia2Type) \
+ std::pair<RelationType, const WCHAR* const>(RelationType::geckoType, ia2Type),
+
+static const std::pair<RelationType, const WCHAR* const> sRelationTypePairs[] =
+ {
+#include "RelationTypeMap.h"
+};
+
+#undef RELATIONTYPE
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif