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// Copyright (C) 2019 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.
#include "icing/index/iterator/doc-hit-info-iterator-not.h"
#include <cstdint>
#include <memory>
#include <utility>
#include "icing/text_classifier/lib3/utils/base/status.h"
#include "icing/absl_ports/canonical_errors.h"
#include "icing/absl_ports/str_cat.h"
#include "icing/index/hit/doc-hit-info.h"
#include "icing/index/iterator/doc-hit-info-iterator-all-document-id.h"
#include "icing/index/iterator/doc-hit-info-iterator.h"
#include "icing/store/document-id.h"
namespace icing {
namespace lib {
DocHitInfoIteratorNot::DocHitInfoIteratorNot(
std::unique_ptr<DocHitInfoIterator> to_be_excluded,
DocumentId document_id_limit)
: to_be_excluded_(std::move(to_be_excluded)),
all_document_id_iterator_(
DocHitInfoIteratorAllDocumentId(document_id_limit)) {}
libtextclassifier3::Status DocHitInfoIteratorNot::Advance() {
while (all_document_id_iterator_.Advance().ok()) {
if (all_document_id_iterator_.doc_hit_info().document_id() <
to_be_excluded_->doc_hit_info().document_id()) {
// Since DocumentIds are returned from DocHitInfoIterators in decreasing
// order, we have passed the last NOT result if we're smaller than its
// DocumentId. Advance the NOT result if so.
to_be_excluded_->Advance().IgnoreError();
}
if (all_document_id_iterator_.doc_hit_info().document_id() ==
to_be_excluded_->doc_hit_info().document_id()) {
// This is a NOT result, skip and Advance to the next result.
continue;
}
// No errors, we've found a valid result
doc_hit_info_ = all_document_id_iterator_.doc_hit_info();
return libtextclassifier3::Status::OK;
}
// Didn't find a hit, return with error
doc_hit_info_ = DocHitInfo(kInvalidDocumentId);
return absl_ports::ResourceExhaustedError("No more DocHitInfos in iterator");
}
libtextclassifier3::StatusOr<DocHitInfoIterator::TrimmedNode>
DocHitInfoIteratorNot::TrimRightMostNode() && {
// Don't generate suggestion if the last operator is NOT.
return absl_ports::InvalidArgumentError(
"Cannot generate suggestion if the last term is NOT operator.");
}
void DocHitInfoIteratorNot::MapChildren(const ChildrenMapper& mapper) {
to_be_excluded_ = mapper(std::move(to_be_excluded_));
}
std::string DocHitInfoIteratorNot::ToString() const {
return absl_ports::StrCat("(NOT ", to_be_excluded_->ToString(), ")");
}
} // namespace lib
} // namespace icing
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