Libosmium  2.15.1
Fast and flexible C++ library for working with OpenStreetMap data
tags_filter.hpp
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1 #ifndef OSMIUM_TAGS_TAGS_FILTER_HPP
2 #define OSMIUM_TAGS_TAGS_FILTER_HPP
3 
4 /*
5 
6 This file is part of Osmium (https://osmcode.org/libosmium).
7 
8 Copyright 2013-2019 Jochen Topf <jochen@topf.org> and others (see README).
9 
10 Boost Software License - Version 1.0 - August 17th, 2003
11 
12 Permission is hereby granted, free of charge, to any person or organization
13 obtaining a copy of the software and accompanying documentation covered by
14 this license (the "Software") to use, reproduce, display, distribute,
15 execute, and transmit the Software, and to prepare derivative works of the
16 Software, and to permit third-parties to whom the Software is furnished to
17 do so, all subject to the following:
18 
19 The copyright notices in the Software and this entire statement, including
20 the above license grant, this restriction and the following disclaimer,
21 must be included in all copies of the Software, in whole or in part, and
22 all derivative works of the Software, unless such copies or derivative
23 works are solely in the form of machine-executable object code generated by
24 a source language processor.
25 
26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
29 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
30 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
31 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
32 DEALINGS IN THE SOFTWARE.
33 
34 */
35 
36 #include <osmium/osm/tag.hpp>
37 #include <osmium/tags/matcher.hpp>
38 
39 #include <boost/iterator/filter_iterator.hpp>
40 
41 #include <utility>
42 #include <vector>
43 
44 namespace osmium {
45 
67  template <typename TResult>
69 
70  std::vector<std::pair<TResult, TagMatcher>> m_rules;
72 
73  public:
74 
75  using iterator = boost::filter_iterator<TagsFilterBase, osmium::TagList::const_iterator>;
76 
83  explicit TagsFilterBase(const TResult default_result = TResult{}) :
84  m_default_result(default_result) {
85  }
86 
91  void set_default_result(const TResult default_result) noexcept {
92  m_default_result = default_result;
93  }
94 
102  TagsFilterBase& add_rule(const TResult result, const TagMatcher& matcher) {
103  m_rules.emplace_back(result, matcher);
104  return *this;
105  }
106 
115  template <typename... TArgs>
116  TagsFilterBase& add_rule(const TResult result, TArgs&&... args) {
117  m_rules.emplace_back(result, osmium::TagMatcher{std::forward<TArgs>(args)...});
118  return *this;
119  }
120 
128  TResult operator()(const osmium::Tag& tag) const noexcept {
129  for (const auto& rule : m_rules) {
130  if (rule.second(tag)) {
131  return rule.first;
132  }
133  }
134  return m_default_result;
135  }
136 
142  std::size_t count() const noexcept {
143  return m_rules.size();
144  }
145 
151  bool empty() const noexcept {
152  return m_rules.empty();
153  }
154 
155  }; // class TagsFilterBase
156 
158 
159 } // namespace osmium
160 
161 
162 #endif // OSMIUM_TAGS_TAGS_FILTER_HPP
boost::filter_iterator< TagsFilterBase, osmium::TagList::const_iterator > iterator
Definition: tags_filter.hpp:75
Definition: tag.hpp:48
TagsFilterBase(const TResult default_result=TResult{})
Definition: tags_filter.hpp:83
Definition: tags_filter.hpp:68
TagsFilterBase & add_rule(const TResult result, const TagMatcher &matcher)
Definition: tags_filter.hpp:102
std::size_t count() const noexcept
Definition: tags_filter.hpp:142
Namespace for everything in the Osmium library.
Definition: assembler.hpp:53
Definition: matcher.hpp:47
bool empty() const noexcept
Definition: tags_filter.hpp:151
TagsFilterBase & add_rule(const TResult result, TArgs &&... args)
Definition: tags_filter.hpp:116
void set_default_result(const TResult default_result) noexcept
Definition: tags_filter.hpp:91
TResult operator()(const osmium::Tag &tag) const noexcept
Definition: tags_filter.hpp:128
std::vector< std::pair< TResult, TagMatcher > > m_rules
Definition: tags_filter.hpp:70
TResult m_default_result
Definition: tags_filter.hpp:71