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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/stllike/string.h>
#include <vespa/vespalib/datastore/entryref.h>
#include <cstdint>
namespace search::index { class DocIdAndFeatures; }
namespace search::memoryindex {
/**
* Interface used to insert inverted documents into a FieldIndex,
* updating the underlying posting lists in that index.
*
* Insert order must be properly sorted, first by word, then by docId.
*/
class IOrderedFieldIndexInserter {
public:
virtual ~IOrderedFieldIndexInserter() {}
/**
* Set next word to operate on.
*/
virtual void setNextWord(const vespalib::stringref word) = 0;
/**
* Add (word, docId) tuple with the given features.
*/
virtual void add(uint32_t docId, const index::DocIdAndFeatures &features) = 0;
/**
* Returns the reference to the current word (only used by unit tests).
*/
virtual vespalib::datastore::EntryRef getWordRef() const = 0;
/**
* Remove (word, docId) tuple.
*/
virtual void remove(uint32_t docId) = 0;
/**
* Flush pending changes for the current word (into the underlying posting list).
*/
virtual void flush() = 0;
/*
* Make current state visible to readers.
*/
virtual void commit() = 0;
/**
* Rewind to prepare for another set of (word, docId) tuples.
*/
virtual void rewind() = 0;
};
}
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