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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 "result.h"
#include <vector>
namespace document::select {
/*
* Contains possible values of operations returning a Result.
*/
class ResultSet
{
// bitvector of the enum values for possible results
uint8_t _val; // range [0..7], cf. Result::toEnum()
// Precalculated results for boolean operations on Result.
struct PreCalculated {
PreCalculated(uint32_t range);
~PreCalculated();
std::vector<ResultSet> _ands;
std::vector<ResultSet> _ors;
std::vector<ResultSet> _nots;
};
static const PreCalculated _preCalc;
public:
ResultSet() noexcept : _val(0u) { }
static uint32_t enumToMask(uint32_t rhs) noexcept {
return 1u << rhs;
}
static uint32_t illegalMask() noexcept {
return (1u << Result::enumRange);
}
void add(const Result &rhs) {
_val |= enumToMask(rhs.toEnum());
}
[[nodiscard]] bool hasEnum(uint32_t rhs) const {
return (_val & enumToMask(rhs)) != 0u;
}
bool operator==(const ResultSet &rhs) const {
return _val == rhs._val;
}
bool operator!=(const ResultSet &rhs) const {
return _val != rhs._val;
}
// calculcate set of results emitted by document selection and operator.
[[nodiscard]] ResultSet calcAnd(const ResultSet &rhs) const {
return _preCalc._ands[(_val << Result::enumRange) | rhs._val];
}
// calculcate set of results emitted by document selection or operator.
[[nodiscard]] ResultSet calcOr(const ResultSet &rhs) const {
return _preCalc._ors[(_val << Result::enumRange) | rhs._val];
}
// calculcate set of results emitted by document selection not operator.
[[nodiscard]] ResultSet calcNot() const { return _preCalc._nots[_val]; }
void clear() { _val = 0; }
void fill() { _val = illegalMask() - 1; }
static void preCalc();
private:
// precalc helper methods
void pcnext() noexcept { ++_val; }
[[nodiscard]] bool pcvalid() const noexcept { return _val < illegalMask(); }
};
}
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