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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
namespace search::queryeval { class SearchIterator; }
namespace search::fef { class TermFieldMatchData; }
namespace search { class BitVector; }
namespace search::attribute {
/**
* Interface for search context helper classes to create attribute
* search iterators based on posting lists and using dictionary
* information to better estimate number of hits. Also used for
* enumerated attributes without posting lists to eliminate brute
* force searches for nonexisting values.
*/
class IPostingListSearchContext
{
protected:
IPostingListSearchContext() { }
virtual ~IPostingListSearchContext() { }
public:
/**
* Will load/prepare any postings lists. Will take strictness and optional filter into account.
* @param strict If true iterator must advance to next valid docid.
* @param filter Any prefilter that can be applied to posting lists for optimization purposes.
*/
virtual void fetchPostings(bool strict, const BitVector * filter) = 0;
virtual std::unique_ptr<queryeval::SearchIterator> createPostingIterator(fef::TermFieldMatchData *matchData, bool strict) = 0;
virtual unsigned int approximateHits() const = 0;
};
}
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