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+/* 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_a11y_EmbeddedObjCollector_h__
+#define mozilla_a11y_EmbeddedObjCollector_h__
+
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace a11y {
+
+class LocalAccessible;
+
+/**
+ * Collect embedded objects. Provide quick access to accessible by index and
+ * vice versa.
+ */
+class EmbeddedObjCollector final {
+ public:
+ ~EmbeddedObjCollector() {}
+
+ /**
+ * Return index of the given accessible within the collection.
+ */
+ int32_t GetIndexAt(LocalAccessible* aAccessible);
+
+ /**
+ * Return accessible count within the collection.
+ */
+ uint32_t Count();
+
+ /**
+ * Return an accessible from the collection at the given index.
+ */
+ LocalAccessible* GetAccessibleAt(uint32_t aIndex);
+
+ protected:
+ /**
+ * Ensure accessible at the given index is stored and return it.
+ */
+ LocalAccessible* EnsureNGetObject(uint32_t aIndex);
+
+ /**
+ * Ensure index for the given accessible is stored and return it.
+ */
+ int32_t EnsureNGetIndex(LocalAccessible* aAccessible);
+
+ // Make sure it's used by LocalAccessible class only.
+ explicit EmbeddedObjCollector(LocalAccessible* aRoot)
+ : mRoot(aRoot), mRootChildIdx(0) {}
+
+ /**
+ * Append the object to collection.
+ */
+ void AppendObject(LocalAccessible* aAccessible);
+
+ friend class LocalAccessible;
+
+ LocalAccessible* mRoot;
+ uint32_t mRootChildIdx;
+ nsTArray<LocalAccessible*> mObjects;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif