129 lines
4.4 KiB
C++
129 lines
4.4 KiB
C++
#ifndef OSMIUM_HANDLER_CHAIN_HPP
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#define OSMIUM_HANDLER_CHAIN_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013-2017 Jochen Topf <jochen@topf.org> and others (see README).
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <tuple>
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#include <osmium/handler.hpp>
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#define OSMIUM_CHAIN_HANDLER_CALL(_func_, _type_) \
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template <int N, int SIZE, typename THandlers> \
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struct call_ ## _func_ { \
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void operator()(THandlers& handlers, osmium::_type_& object) { \
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std::get<N>(handlers)._func_(object); \
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call_ ## _func_<N+1, SIZE, THandlers>()(handlers, object); \
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} \
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}; \
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template <int SIZE, typename THandlers> \
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struct call_ ## _func_<SIZE, SIZE, THandlers> { \
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void operator()(THandlers&, osmium::_type_&) {} \
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};
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namespace osmium {
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class Node;
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class Way;
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class Relation;
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class Area;
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class Changeset;
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namespace handler {
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/**
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* This handler allows chaining of any number of handlers into a single
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* handler.
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*/
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template <typename... THandler>
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class ChainHandler : public osmium::handler::Handler {
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using handlers_type = std::tuple<THandler&...>;
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handlers_type m_handlers;
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template <int N, int SIZE, typename THandlers>
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struct call_flush {
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void operator()(THandlers& handlers) {
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std::get<N>(handlers).flush();
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call_flush<N + 1, SIZE, THandlers>()(handlers);
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}
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}; // struct call_flush
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template <int SIZE, typename THandlers>
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struct call_flush<SIZE, SIZE, THandlers> {
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void operator()(THandlers&) {}
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}; // struct call_flush
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OSMIUM_CHAIN_HANDLER_CALL(node, Node)
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OSMIUM_CHAIN_HANDLER_CALL(way, Way)
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OSMIUM_CHAIN_HANDLER_CALL(relation, Relation)
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OSMIUM_CHAIN_HANDLER_CALL(changeset, Changeset)
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OSMIUM_CHAIN_HANDLER_CALL(area, Area)
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public:
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explicit ChainHandler(THandler&... handlers) :
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m_handlers(handlers...) {
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}
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void node(osmium::Node& node) {
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call_node<0, sizeof...(THandler), handlers_type>()(m_handlers, node);
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}
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void way(osmium::Way& way) {
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call_way<0, sizeof...(THandler), handlers_type>()(m_handlers, way);
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}
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void relation(osmium::Relation& relation) {
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call_relation<0, sizeof...(THandler), handlers_type>()(m_handlers, relation);
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}
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void changeset(osmium::Changeset& changeset) {
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call_changeset<0, sizeof...(THandler), handlers_type>()(m_handlers, changeset);
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}
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void area(osmium::Area& area) {
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call_area<0, sizeof...(THandler), handlers_type>()(m_handlers, area);
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}
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void flush() {
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call_flush<0, sizeof...(THandler), handlers_type>()(m_handlers);
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}
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}; // class ChainHandler
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} // namespace handler
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} // namespace osmium
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#endif // OSMIUM_HANDLER_CHAIN_HPP
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