File indexing completed on 2024-12-08 10:16:03

 /*
     SPDX-FileCopyrightText: 2020 Volker Krause <vkrause@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #ifndef OSM_ELEMENT_H
 #define OSM_ELEMENT_H
 
 #include "datatypes.h"
 #include "internal.h"
 
 #include <cstdint>
 
 namespace OSM {
 
 /** A reference to any of OSM::Node/OSM::Way/OSM::Relation.
  *  Lifetime of the referenced object needs to extend beyond the lifetime of this.
  */
 class Element
 {
 public:
     inline constexpr Element() : m_elem(nullptr, static_cast<uint8_t>(Type::Null)) {}
     inline Element(const Node *node) : m_elem(node, static_cast<uint8_t>(Type::Node)) {}
     inline Element(const Way *way) : m_elem(way, static_cast<uint8_t>(Type::Way)) {}
     inline Element(const Relation *relation) : m_elem(relation, static_cast<uint8_t>(Type::Relation)) {}
 
     inline bool operator==(Element other) const { return m_elem == other.m_elem; }
     inline bool operator!=(Element other) const { return m_elem != other.m_elem; }
     inline bool operator<(Element other) const { return m_elem < other.m_elem; }
     explicit inline operator bool() const { return type() != OSM::Type::Null; }
 
     inline Type type() const { return static_cast<Type>(m_elem.tag()); }
     inline const Node* node() const { return static_cast<const Node*>(m_elem.get()); }
     inline const Way* way() const { return static_cast<const Way*>(m_elem.get()); }
     inline const Relation* relation() const { return static_cast<const Relation*>(m_elem.get()); }
     Id id() const;
 
     Coordinate center() const;
     BoundingBox boundingBox() const;
     QByteArray tagValue(TagKey key) const;
     QByteArray tagValue(const char *keyName) const;
     QByteArray tagValue(const char *keyName, const QLocale &locale) const;
     /** Returns the value of the first non-empty tag.
      *  Both OSM::TagKey (fast) and const char* (slow) keys are accepted.
      */
     template <typename K, typename ...Args> QByteArray tagValue(K key, Args... args) const;
     template <typename K, typename ...Args> QByteArray tagValue(K key, Args... args, const QLocale &locale) const;
     /** Returns whether or not this element has any tags set. */
     inline bool hasTags() const { return std::distance(tagsBegin(), tagsEnd()) > 0; }
 
     std::vector<Tag>::const_iterator tagsBegin() const;
     std::vector<Tag>::const_iterator tagsEnd() const;
     QString url() const;
 
     /** Returns all nodes belonging to the outer path of this element.
      *  In the simplest case that's a single closed polygon, but it can also be a sequence of multiple
      *  closed loop polygons, or a polyline.
      */
     std::vector<const Node*> outerPath(const DataSet &dataSet) const;
 
     /** Recompute the bounding box of this element.
      *  We usually assume those to be provided by Overpass/osmconvert, but there seem to be cases where those
      *  aren't reliable.
      */
     void recomputeBoundingBox(const DataSet &dataSet);
 
 private:
     Internal::TaggedPointer<const void> m_elem;
 };
 
 template <typename K, typename ...Args>
 QByteArray Element::tagValue(K k, Args... args) const
 {
     const auto v = tagValue(k);
     if (!v.isEmpty()) {
         return v;
     }
     return tagValue(args...);
 }
 
 template <typename K, typename ...Args>
 QByteArray Element::tagValue(K key, Args... args, const QLocale &locale) const
 {
     const auto v = tagValue(key, locale);
     if (!v.isEmpty()) {
         return v;
     }
     return tagValue(args..., locale);
 }
 
 
 /** A std::unique_ptr-like object for OSM element types. */
 class UniqueElement
 {
 public:
     explicit inline UniqueElement() = default;
     explicit inline UniqueElement(Node *node) : m_element(node) {}
     explicit inline UniqueElement(Way *way) : m_element(way) {}
     explicit inline UniqueElement(Relation *rel) : m_element(rel) {}
 
     UniqueElement(const UniqueElement&) = delete;
     inline UniqueElement(UniqueElement &&other) {
         m_element = other.m_element;
         other.m_element = {};
     }
 
     ~UniqueElement();
 
     UniqueElement& operator=(const UniqueElement&) = delete;
     UniqueElement& operator=(UniqueElement &&other) {
         m_element = other.m_element;
         other.m_element = {};
         return *this;
     }
 
     constexpr inline Element element() const { return m_element; }
     constexpr inline operator Element() const { return m_element; }
 
     void setTagValue(TagKey key, const QByteArray &value);
 
 private:
     Element m_element;
 };
 
 
 /** Utility function similar to SQL COALESCE for OSM::Element, ie. this returns the first non-null element passed as argument. */
 constexpr Element coalesce(Element e) { return e; }
 template <typename ...Args>
 constexpr Element coalesce(Element e, Args... args) { return e ? e : coalesce(args...); }
 
 enum ForeachFlag : uint8_t {
     IncludeRelations = 1,
     IncludeWays = 2,
     IncludeNodes = 4,
     IterateAll = IncludeRelations | IncludeWays | IncludeNodes,
 };
 
 template <typename Func>
 inline void for_each(const DataSet &dataSet, Func func, uint8_t flags = IterateAll)
 {
     if (flags & IncludeRelations) {
         for (const auto &rel : dataSet.relations) {
             func(Element(&rel));
         }
     }
     if (flags & IncludeWays) {
         for (const auto &way : dataSet.ways) {
             func(Element(&way));
         }
     }
     if (flags & IncludeNodes) {
         for (const auto &node : dataSet.nodes) {
             func(Element(&node));
         }
     }
 }
 
 template <typename Func>
 inline void for_each_node(const DataSet &dataSet, const Way &way, Func func)
 {
     for (auto nodeId : way.nodes) {
         if (auto node = dataSet.node(nodeId)) {
             func(*node);
         }
     }
 }
 
 template <typename Func>
 inline void for_each_member(const DataSet &dataSet, const Relation &rel, Func func)
 {
     for (const auto &mem : rel.members) {
         switch (mem.type()) {
             case Type::Null:
                 break;
             case Type::Node:
                 if (auto node = dataSet.node(mem.id)) {
                     func(Element(node));
                 }
                 break;
             case Type::Way:
                 if (auto way = dataSet.way(mem.id)) {
                     func(Element(way));
                 }
                 break;
             case Type::Relation:
                 if (auto rel = dataSet.relation(mem.id)) {
                     func(Element(rel));
                 }
                 break;
         }
     }
 }
 
 }
 
 Q_DECLARE_METATYPE(OSM::Element)
 
 #endif // OSM_ELEMENT_H