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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 "predicate_posting_list.h"
#include "predicate_interval_store.h"
namespace search::predicate {
/**
* PredicatePostingList implementation for range query edge iterators (bounds)
* from PredicateIndex.
*/
template<typename Iterator>
class PredicateBoundsPostingList : public PredicatePostingList {
const PredicateIntervalStore &_interval_store;
Iterator _iterator;
const IntervalWithBounds *_current_interval;
uint32_t _interval_count;
uint32_t _value_diff;
IntervalWithBounds _single_buf;
public:
PredicateBoundsPostingList(const PredicateIntervalStore &interval_store,Iterator it,uint32_t value_diff);
bool next(uint32_t doc_id) override;
bool nextInterval() override;
VESPA_DLL_LOCAL uint32_t getInterval() const override {
return _current_interval ? _current_interval->interval : 0;
}
};
template<typename Iterator>
PredicateBoundsPostingList<Iterator>::PredicateBoundsPostingList(
const PredicateIntervalStore &interval_store,
Iterator it, uint32_t value_diff)
: _interval_store(interval_store),
_iterator(it),
_current_interval(0),
_interval_count(0),
_value_diff(value_diff) {
}
namespace {
bool checkBounds(uint32_t bounds, uint32_t diff) {
if (bounds & 0x80000000) {
return diff >= (bounds & 0x3fffffff);
} else if (bounds & 0x40000000) {
return diff < (bounds & 0x3fffffff);
} else {
return (diff >= (bounds >> 16)) && (diff < (bounds & 0xffff));
}
}
} // namespace
template<typename Iterator>
bool
PredicateBoundsPostingList<Iterator>::next(uint32_t doc_id) {
if (_iterator.valid() && _iterator.getKey() <= doc_id) {
_iterator.linearSeek(doc_id + 1);
}
for (;; ++_iterator) {
if (!_iterator.valid()) {
return false;
}
_current_interval = _interval_store.get(_iterator.getData(), _interval_count, &_single_buf);
if (checkBounds(_current_interval->bounds, _value_diff)) {
break;
}
if (nextInterval()) {
break;
}
}
setDocId(_iterator.getKey());
return true;
}
template<typename Iterator>
bool
PredicateBoundsPostingList<Iterator>::nextInterval() {
uint32_t next_bounds;
do {
if (__builtin_expect(_interval_count == 1, true)) {
return false;
}
++_current_interval;
--_interval_count;
next_bounds = _current_interval->bounds;
} while (!checkBounds(next_bounds, _value_diff));
return true;
}
}
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