filter.hpp
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#ifndef OSMIUM_TAGS_FILTER_HPP
#define OSMIUM_TAGS_FILTER_HPP
/*
This file is part of Osmium (http://osmcode.org/libosmium).
Copyright 2013-2016 Jochen Topf <jochen@topf.org> and others (see README).
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include <string>
#include <type_traits>
#include <vector>
#include <boost/iterator/filter_iterator.hpp>
#include <osmium/memory/collection.hpp>
#include <osmium/osm/tag.hpp>
namespace osmium {
namespace tags {
template <typename TKey>
struct match_key {
bool operator()(const TKey& rule_key, const char* tag_key) {
return rule_key == tag_key;
}
}; // struct match_key
struct match_key_prefix {
bool operator()(const std::string& rule_key, const char* tag_key) {
return rule_key.compare(0, std::string::npos, tag_key, 0, rule_key.size()) == 0;
}
}; // struct match_key_prefix
template <typename TValue>
struct match_value {
bool operator()(const TValue& rule_value, const char* tag_value) {
return rule_value == tag_value;
}
}; // struct match_value
template <>
struct match_value<void> {
bool operator()(const bool, const char*) {
return true;
}
}; // struct match_value<void>
template <typename TKey, typename TValue=void, typename TKeyComp=match_key<TKey>, typename TValueComp=match_value<TValue>>
class Filter {
typedef TKey key_type;
typedef typename std::conditional<std::is_void<TValue>::value, bool, TValue>::type value_type;
struct Rule {
key_type key;
value_type value;
bool ignore_value;
bool result;
explicit Rule(bool r, bool ignore, const key_type& k, const value_type& v) :
key(k),
value(v),
ignore_value(ignore),
result(r) {
}
explicit Rule(bool r, bool ignore, const key_type& k) :
key(k),
value(),
ignore_value(ignore),
result(r) {
}
}; // struct Rule
std::vector<Rule> m_rules;
bool m_default_result;
public:
typedef Filter<TKey, TValue, TKeyComp, TValueComp> filter_type;
typedef const osmium::Tag& argument_type;
typedef bool result_type;
typedef boost::filter_iterator<filter_type, osmium::TagList::const_iterator> iterator;
explicit Filter(bool default_result = false) :
m_default_result(default_result) {
}
template <typename V=TValue, typename std::enable_if<!std::is_void<V>::value, int>::type = 0>
Filter& add(bool result, const key_type& key, const value_type& value) {
m_rules.emplace_back(result, false, key, value);
return *this;
}
Filter& add(bool result, const key_type& key) {
m_rules.emplace_back(result, true, key);
return *this;
}
bool operator()(const osmium::Tag& tag) const {
for (const Rule& rule : m_rules) {
if (TKeyComp()(rule.key, tag.key()) && (rule.ignore_value || TValueComp()(rule.value, tag.value()))) {
return rule.result;
}
}
return m_default_result;
}
size_t count() const {
return m_rules.count();
}
bool empty() const {
return m_rules.empty();
}
}; // class Filter
typedef Filter<std::string, std::string> KeyValueFilter;
typedef Filter<std::string> KeyFilter;
typedef Filter<std::string, void, match_key_prefix> KeyPrefixFilter;
} // namespace tags
} // namespace osmium
#endif // OSMIUM_TAGS_FILTER_HPP
osmium::Tag
Definition: tag.hpp:48
collection.hpp
osmium::tags::Filter::empty
bool empty() const
Definition: filter.hpp:148
osmium::tags::Filter
Definition: filter.hpp:77
osmium::tags::Filter::add
Filter & add(bool result, const key_type &key)
Definition: filter.hpp:124
osmium::tags::Filter::Rule::key
key_type key
Definition: filter.hpp:83
osmium::osm_entity_bits::type
type
Definition: entity_bits.hpp:60
osmium::Tag::value
const char * value() const
Definition: tag.hpp:83
osmium::tags::Filter::filter_type
Filter< TKey, TValue, TKeyComp, TValueComp > filter_type
Definition: filter.hpp:109
osmium::tags::Filter::value_type
std::conditional< std::is_void< TValue >::value, bool, TValue >::type value_type
Definition: filter.hpp:80
osmium::tags::match_value
Definition: filter.hpp:63
osmium::tags::Filter::add
Filter & add(bool result, const key_type &key, const value_type &value)
Definition: filter.hpp:119
osmium::tags::Filter::key_type
TKey key_type
Definition: filter.hpp:79
osmium::tags::Filter::m_default_result
bool m_default_result
Definition: filter.hpp:105
osmium::tags::Filter::Filter
Filter(bool default_result=false)
Definition: filter.hpp:114
tag.hpp
osmium::tags::Filter::Rule::Rule
Rule(bool r, bool ignore, const key_type &k)
Definition: filter.hpp:95
osmium::tags::Filter::Rule::ignore_value
bool ignore_value
Definition: filter.hpp:85
osmium::tags::Filter::Rule
Definition: filter.hpp:82
osmium::tags::Filter::result_type
bool result_type
Definition: filter.hpp:111
osmium::tags::Filter::operator()
bool operator()(const osmium::Tag &tag) const
Definition: filter.hpp:129
osmium::tags::match_key_prefix
Definition: filter.hpp:56
osmium
Namespace for everything in the Osmium library.
Definition: assembler.hpp:59
osmium::tags::KeyValueFilter
Filter< std::string, std::string > KeyValueFilter
Definition: filter.hpp:154
osmium::tags::match_key::operator()
bool operator()(const TKey &rule_key, const char *tag_key)
Definition: filter.hpp:51
osmium::tags::match_key_prefix::operator()
bool operator()(const std::string &rule_key, const char *tag_key)
Definition: filter.hpp:57
osmium::tags::Filter::iterator
boost::filter_iterator< filter_type, osmium::TagList::const_iterator > iterator
Definition: filter.hpp:112
osmium::tags::Filter::Rule::Rule
Rule(bool r, bool ignore, const key_type &k, const value_type &v)
Definition: filter.hpp:88
osmium::tags::match_value::operator()
bool operator()(const TValue &rule_value, const char *tag_value)
Definition: filter.hpp:64
osmium::Tag::key
const char * key() const noexcept
Definition: tag.hpp:79
osmium::tags::Filter::argument_type
const osmium::Tag & argument_type
Definition: filter.hpp:110
osmium::tags::Filter::count
size_t count() const
Definition: filter.hpp:141
osmium::tags::Filter::Rule::value
value_type value
Definition: filter.hpp:84
osmium::tags::match_key
Definition: filter.hpp:50
osmium::tags::KeyFilter
Filter< std::string > KeyFilter
Definition: filter.hpp:155
osmium::tags::KeyPrefixFilter
Filter< std::string, void, match_key_prefix > KeyPrefixFilter
Definition: filter.hpp:156
osmium::tags::match_value< void >::operator()
bool operator()(const bool, const char *)
Definition: filter.hpp:71
osmium::tags::Filter::Rule::result
bool result
Definition: filter.hpp:86
osmium::tags::Filter::m_rules
std::vector< Rule > m_rules
Definition: filter.hpp:104