mirror of
https://github.com/matrix-construct/construct
synced 2024-11-27 01:02:46 +01:00
130 lines
2.9 KiB
C++
130 lines
2.9 KiB
C++
/*
|
|
* Copyright (C) 2016 Charybdis Development Team
|
|
* Copyright (C) 2016 Jason Volk <jason@zemos.net>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice is present in all copies.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_DB_WHERE_H
|
|
|
|
namespace ircd::db
|
|
{
|
|
template<class tuple> struct where;
|
|
}
|
|
|
|
template<class tuple>
|
|
struct ircd::db::where
|
|
{
|
|
struct noop;
|
|
struct equal;
|
|
struct not_equal;
|
|
|
|
virtual bool operator()(const tuple &) const = 0;
|
|
virtual ~where() noexcept = default;
|
|
};
|
|
|
|
template<class tuple>
|
|
struct ircd::db::where<tuple>::noop
|
|
:ircd::db::where<tuple>
|
|
{
|
|
bool operator()(const tuple &) const override
|
|
{
|
|
return true;
|
|
}
|
|
};
|
|
|
|
template<class tuple>
|
|
struct ircd::db::where<tuple>::equal
|
|
:ircd::db::where<tuple>
|
|
{
|
|
tuple value;
|
|
|
|
bool operator()(const tuple &) const override;
|
|
|
|
equal(const tuple &value)
|
|
:value{value}
|
|
{}
|
|
|
|
equal(std::initializer_list<json::index::member> members)
|
|
:value{std::move(members)}
|
|
{}
|
|
};
|
|
|
|
template<class tuple>
|
|
bool
|
|
ircd::db::where<tuple>::equal::operator()(const tuple &t)
|
|
const
|
|
{
|
|
return json::until(this->value, [&t]
|
|
(const auto &key, auto&& where_value)
|
|
{
|
|
if(!where_value)
|
|
return true;
|
|
|
|
bool equal(true);
|
|
at(t, key, [&where_value, &equal]
|
|
(auto&& value)
|
|
{
|
|
//equal = value == where_value;
|
|
equal = (byte_view<>(value) == byte_view<>(where_value));
|
|
});
|
|
|
|
return equal;
|
|
});
|
|
}
|
|
|
|
template<class tuple>
|
|
struct ircd::db::where<tuple>::not_equal
|
|
:ircd::db::where<tuple>
|
|
{
|
|
tuple value;
|
|
|
|
bool operator()(const tuple &) const override;
|
|
|
|
not_equal(const tuple &value)
|
|
:value{value}
|
|
{}
|
|
|
|
not_equal(std::initializer_list<json::index::member> members)
|
|
:value{std::move(members)}
|
|
{}
|
|
};
|
|
|
|
template<class tuple>
|
|
bool
|
|
ircd::db::where<tuple>::not_equal::operator()(const tuple &t)
|
|
const
|
|
{
|
|
return json::until(this->value, [&t]
|
|
(const auto &key, auto&& where_value)
|
|
{
|
|
if(!where_value)
|
|
return true;
|
|
|
|
bool not_equal(true);
|
|
at(t, key, [&where_value, ¬_equal]
|
|
(auto&& value)
|
|
{
|
|
//equal = value == where_value;
|
|
not_equal = (byte_view<>(value) != byte_view<>(where_value));
|
|
});
|
|
|
|
return not_equal;
|
|
});
|
|
}
|