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+// Copyright (C) 2023 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_TERM_INDEXING_HANDLER_H_
+#define ICING_INDEX_TERM_INDEXING_HANDLER_H_
+
+#include <memory>
+#include <utility>
+
+#include "icing/text_classifier/lib3/utils/base/status.h"
+#include "icing/text_classifier/lib3/utils/base/statusor.h"
+#include "icing/index/data-indexing-handler.h"
+#include "icing/index/index.h"
+#include "icing/index/property-existence-indexing-handler.h"
+#include "icing/index/string-section-indexing-handler.h"
+#include "icing/proto/logging.pb.h"
+#include "icing/store/document-id.h"
+#include "icing/transform/normalizer.h"
+#include "icing/util/clock.h"
+#include "icing/util/tokenized-document.h"
+
+namespace icing {
+namespace lib {
+
+class TermIndexingHandler : public DataIndexingHandler {
+ public:
+  // Creates a TermIndexingHandler instance which does not take
+  // ownership of any input components. All pointers must refer to valid objects
+  // that outlive the created TermIndexingHandler instance.
+  //
+  // Returns:
+  //   - A TermIndexingHandler instance on success
+  //   - FAILED_PRECONDITION_ERROR if any of the input pointer is null
+  static libtextclassifier3::StatusOr<std::unique_ptr<TermIndexingHandler>>
+  Create(const Clock* clock, const Normalizer* normalizer, Index* index,
+         bool build_property_existence_metadata_hits);
+
+  ~TermIndexingHandler() override = default;
+
+  // Handles term indexing process:
+  // - Checks if document_id > last_added_document_id.
+  // - Updates last_added_document_id to document_id.
+  // - Handles PropertyExistenceIndexingHandler.
+  // - Handles StringSectionIndexingHandler.
+  // - Sorts the lite index if necessary.
+  // - Merges the lite index into the main index if necessary.
+  //
+  /// Returns:
+  //   - OK on success
+  //   - INVALID_ARGUMENT_ERROR if document_id is less than or equal to the
+  //     document_id of a previously indexed document in non recovery mode.
+  //   - RESOURCE_EXHAUSTED_ERROR if the index is full and can't add anymore
+  //     content.
+  //   - DATA_LOSS_ERROR if an attempt to merge the index fails and both indices
+  //     are cleared as a result.
+  //   - INTERNAL_ERROR if any other errors occur.
+  //   - Any main/lite index errors.
+  libtextclassifier3::Status Handle(
+      const TokenizedDocument& tokenized_document, DocumentId document_id,
+      bool recovery_mode, PutDocumentStatsProto* put_document_stats) override;
+
+ private:
+  explicit TermIndexingHandler(const Clock* clock, Index* index,
+                               std::unique_ptr<PropertyExistenceIndexingHandler>
+                                   property_existence_indexing_handler,
+                               std::unique_ptr<StringSectionIndexingHandler>
+                                   string_section_indexing_handler)
+      : DataIndexingHandler(clock),
+        index_(*index),
+        property_existence_indexing_handler_(
+            std::move(property_existence_indexing_handler)),
+        string_section_indexing_handler_(
+            std::move(string_section_indexing_handler)) {}
+
+  Index& index_;  // Does not own.
+
+  std::unique_ptr<PropertyExistenceIndexingHandler>
+      property_existence_indexing_handler_;  // Nullable
+  std::unique_ptr<StringSectionIndexingHandler>
+      string_section_indexing_handler_;
+};
+
+}  // namespace lib
+}  // namespace icing
+
+#endif  // ICING_INDEX_TERM_INDEXING_HANDLER_H_