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- /*
- * Tencent is pleased to support the open source community by making wwsearch
- * available.
- *
- * Copyright (C) 2018-present Tencent. All Rights Reserved.
- *
- * 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
- *
- * https://opensource.org/licenses/Apache-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 OF ANY KIND, either express or implied. See the License for the
- * specific language governing permissions and limitations under the License.
- */
- #pragma once
- #include "header.h"
- #include "storage_type.h"
- namespace wwsearch {
- /* Notice : Helper class for doc list iterator.
- * Support MergeIterator/OrIterator/DocListReaderCodec.
- * MergeIterator/OrIterator is used in Score to collect doc list.
- * DocListReaderCodec is used to read the doc list after codec(both
- * support fix-length format & variable format, distinguish with header version
- * flag).
- */
- class DocIdSetIterator {
- private:
- public:
- virtual ~DocIdSetIterator() {}
- static DocumentID NO_MORE_DOCS;
- static DocumentID MAX_DOCID;
- virtual DocumentID DocID() = 0;
- // If reac end {@link NO_MORE_DOCS} will return.
- virtual DocumentID NextDoc() = 0;
- // Seek to target or next one greater than target if target is not found.
- virtual DocumentID Advance(DocumentID target) = 0;
- virtual CostType Cost() = 0;
- virtual int FieldId() = 0;
- private:
- };
- } // namespace wwsearch
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