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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 "predicate_posting_list.h"
#include "predicate_interval_store.h"
#include "predicate_interval.h"
namespace search::predicate {
/**
* PredicatePostingList implementation for zstar iterators from
* PredicateIndex.
*/
template <typename Iterator>
class PredicateZstarCompressedPostingList : public PredicatePostingList {
const PredicateIntervalStore &_interval_store;
Iterator _iterator;
const Interval *_current_interval;
uint32_t _interval_count;
uint32_t _interval;
uint32_t _prev_interval;
void setInterval(uint32_t interval) { _interval = interval; }
public:
PredicateZstarCompressedPostingList(const PredicateIntervalStore &store, Iterator it);
bool next(uint32_t doc_id) override;
bool nextInterval() override;
VESPA_DLL_LOCAL uint32_t getInterval() const override { return _interval; }
};
template <typename Iterator>
PredicateZstarCompressedPostingList<Iterator>::PredicateZstarCompressedPostingList(
const PredicateIntervalStore &interval_store, Iterator it)
: _interval_store(interval_store),
_iterator(it),
_current_interval(0),
_interval_count(0),
_interval(0),
_prev_interval(0) {
}
template<typename Iterator>
bool
PredicateZstarCompressedPostingList<Iterator>::next(uint32_t doc_id) {
if (_iterator.valid() && _iterator.getKey() <= doc_id) {
_iterator.linearSeek(doc_id + 1);
}
if (!_iterator.valid()) {
return false;
}
Interval single_buf;
_current_interval = _interval_store.get(_iterator.getData(), _interval_count, &single_buf);
setDocId(_iterator.getKey());
setInterval(_current_interval[0].interval);
_prev_interval = getInterval();
return true;
}
template<typename Iterator>
bool
PredicateZstarCompressedPostingList<Iterator>::nextInterval() {
uint32_t next_interval = UINT32_MAX;
if (_interval_count > 1) {
next_interval = _current_interval[1].interval;
}
if (_prev_interval) {
if ((next_interval & 0xffff0000) == 0) {
setInterval(_prev_interval >> 16 | next_interval << 16);
++_current_interval;
--_interval_count;
} else {
uint32_t value = _prev_interval >> 16;
setInterval((value + 1) << 16 | value);
}
_prev_interval = 0;
return true;
} else if (next_interval != UINT32_MAX) {
++_current_interval;
--_interval_count;
setInterval(next_interval);
_prev_interval = next_interval;
return true;
}
return false;
}
}
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