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+// Copyright (C) 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ICING_INDEX_INTEGER_SECTION_INDEXING_HANDLER_H_
+#define ICING_INDEX_INTEGER_SECTION_INDEXING_HANDLER_H_
+
+#include "icing/text_classifier/lib3/utils/base/status.h"
+#include "icing/index/numeric/numeric-index.h"
+#include "icing/index/section-indexing-handler.h"
+#include "icing/store/document-id.h"
+#include "icing/util/clock.h"
+#include "icing/util/tokenized-document.h"
+
+namespace icing {
+namespace lib {
+
+class IntegerSectionIndexingHandler : public SectionIndexingHandler {
+ public:
+  explicit IntegerSectionIndexingHandler(const Clock* clock,
+                                         NumericIndex<int64_t>* integer_index)
+      : SectionIndexingHandler(clock), integer_index_(*integer_index) {}
+
+  ~IntegerSectionIndexingHandler() override = default;
+
+  // TODO(b/259744228): update this documentation after resolving
+  //                    last_added_document_id problem.
+  // Handles the integer indexing process: add hits into the integer index for
+  // all contents in tokenized_document.integer_sections.
+  //
+  /// Returns:
+  //   - OK on success
+  //   - Any NumericIndex<int64_t>::Editor errors.
+  libtextclassifier3::Status Handle(
+      const TokenizedDocument& tokenized_document, DocumentId document_id,
+      PutDocumentStatsProto* put_document_stats) override;
+
+ private:
+  NumericIndex<int64_t>& integer_index_;
+};
+
+}  // namespace lib
+}  // namespace icing
+
+#endif  // ICING_INDEX_INTEGER_SECTION_INDEXING_HANDLER_H_