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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_JOIN_JOIN_PROCESSOR_H_
#define ICING_JOIN_JOIN_PROCESSOR_H_
#include <vector>
#include "icing/text_classifier/lib3/utils/base/statusor.h"
#include "icing/proto/search.pb.h"
#include "icing/scoring/scored-document-hit.h"
#include "icing/store/document-store.h"
namespace icing {
namespace lib {
class JoinProcessor {
public:
static constexpr std::string_view kFullyQualifiedIdExpr =
"this.fullyQualifiedId()";
explicit JoinProcessor(const DocumentStore* doc_store)
: doc_store_(doc_store) {}
libtextclassifier3::StatusOr<std::vector<JoinedScoredDocumentHit>> Join(
const JoinSpecProto& join_spec,
std::vector<ScoredDocumentHit>&& parent_scored_document_hits,
std::vector<ScoredDocumentHit>&& child_scored_document_hits);
private:
std::string FetchPropertyExpressionValue(
const DocumentId& document_id,
const std::string& property_expression) const;
void UnescapeSeparator(std::string& property, const std::string& separator);
std::vector<int> GetSeparatorLocations(const std::string& content,
const std::string& separator) const;
const DocumentStore* doc_store_; // Does not own.
};
} // namespace lib
} // namespace icing
#endif // ICING_JOIN_JOIN_PROCESSOR_H_
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