mirror of
https://github.com/matrix-construct/construct
synced 2024-11-17 23:40:57 +01:00
130 lines
2.8 KiB
C++
130 lines
2.8 KiB
C++
/*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 Jason Volk <jason@zemos.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#pragma once
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#define HAVE_IRCD_DB_WHERE_H
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namespace ircd::db
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{
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template<class tuple> struct where;
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}
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template<class tuple>
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struct ircd::db::where
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{
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struct noop;
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struct equal;
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struct not_equal;
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virtual bool operator()(const tuple &) const = 0;
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virtual ~where() noexcept = default;
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};
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template<class tuple>
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struct ircd::db::where<tuple>::noop
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:ircd::db::where<tuple>
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{
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bool operator()(const tuple &) const override
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{
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return true;
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}
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};
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template<class tuple>
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struct ircd::db::where<tuple>::equal
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:ircd::db::where<tuple>
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{
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tuple value;
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bool operator()(const tuple &) const override;
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equal(const tuple &value)
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:value{value}
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{}
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equal(json::members members)
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:value{std::move(members)}
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{}
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};
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template<class tuple>
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bool
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ircd::db::where<tuple>::equal::operator()(const tuple &t)
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const
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{
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return json::until(this->value, [&t]
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(const auto &key, auto&& where_value)
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{
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if(!where_value)
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return true;
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bool equal(true);
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at(t, key, [&where_value, &equal]
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(auto&& value)
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{
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//equal = value == where_value;
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equal = (byte_view<>(value) == byte_view<>(where_value));
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});
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return equal;
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});
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}
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template<class tuple>
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struct ircd::db::where<tuple>::not_equal
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:ircd::db::where<tuple>
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{
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tuple value;
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bool operator()(const tuple &) const override;
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not_equal(const tuple &value)
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:value{value}
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{}
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not_equal(json::members members)
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:value{std::move(members)}
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{}
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};
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template<class tuple>
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bool
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ircd::db::where<tuple>::not_equal::operator()(const tuple &t)
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const
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{
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return json::until(this->value, [&t]
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(const auto &key, auto&& where_value)
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{
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if(!where_value)
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return true;
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bool not_equal(true);
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at(t, key, [&where_value, ¬_equal]
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(auto&& value)
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{
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//equal = value == where_value;
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not_equal = (byte_view<>(value) != byte_view<>(where_value));
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});
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return not_equal;
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});
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}
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