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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "indexsearchable.h"
namespace search::queryeval { class ISourceSelector; }
namespace searchcorespi {
/**
* Interface for a set of index searchables with source ids,
* and a source selector for determining which index searchable to use for each document.
*/
class IIndexCollection {
protected:
using ISourceSelector = search::queryeval::ISourceSelector;
public:
using UP = std::unique_ptr<IIndexCollection>;
using SP = std::shared_ptr<IIndexCollection>;
virtual ~IIndexCollection() {}
/**
* Returns the source selector used to determine which index to use for each document.
*/
virtual const ISourceSelector &getSourceSelector() const = 0;
/**
* Returns the number sources (index searchables) for this collection.
*/
virtual size_t getSourceCount() const = 0;
/**
* Returns the index searchable for source i (i in the range [0, getSourceCount()>).
*/
virtual IndexSearchable &getSearchable(uint32_t i) const = 0;
/**
* Returns the source id for source i (i in the range [0, getSourceCount()>).
* The source id is used for this source in the source selector.
*/
virtual uint32_t getSourceId(uint32_t i) const = 0;
virtual vespalib::string toString() const;
};
} // namespace searchcorespi
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