1 #ifndef OSMIUM_RELATIONS_COLLECTOR_HPP 2 #define OSMIUM_RELATIONS_COLLECTOR_HPP 3 4 /* 5 6 This file is part of Osmium (https://osmcode.org/libosmium). 7 8 Copyright 2013-2021 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/handler.hpp> 37 #include <osmium/handler/check_order.hpp> 38 #include <osmium/memory/buffer.hpp> 39 #include <osmium/osm/item_type.hpp> 40 #include <osmium/osm/object.hpp> 41 #include <osmium/osm/relation.hpp> 42 #include <osmium/osm/types.hpp> 43 #include <osmium/relations/detail/member_meta.hpp> 44 #include <osmium/relations/detail/relation_meta.hpp> 45 #include <osmium/util/iterator.hpp> 46 #include <osmium/visitor.hpp> 47 48 #include <algorithm> 49 #include <array> 50 #include <cassert> 51 #include <cstddef> 52 #include <cstdint> 53 #include <functional> 54 #include <iomanip> 55 #include <iostream> 56 #include <utility> 57 #include <vector> 58 59 namespace osmium { 60 61 class Node; 62 class Way; 63 64 /** 65 * @brief Code related to the assembly of OSM relations 66 */ 67 namespace relations { 68 69 /** 70 * The Collector class collects members of a relation. This is a 71 * generic base class that can be used to assemble all kinds of 72 * relations. It has numerous hooks you can implement in derived 73 * classes to customize its behaviour. 74 * 75 * The collector provides two handlers (HandlerPass1 and HandlerPass2) 76 * for a first and second pass through an input file, respectively. In 77 * the first pass all relations we are interested in are stored in 78 * RelationMeta objects in the m_relations vector. All members we are 79 * interested in are stored in MemberMeta objects in the m_member_meta 80 * vectors. The MemberMeta objects also store the information where the 81 * relations containing those members are to be found. 82 * 83 * Later the m_member_meta vectors are sorted according to the member 84 * ids so that a binary search (with std::equal_range) can be used in 85 * the second pass to find the parent relations for each node, way, or 86 * relation coming along. The member objects are stored together with 87 * their relation and once a relation is complete the 88 * complete_relation() method is called which you must overwrite in a 89 * derived class of Collector. 90 * 91 * @tparam TCollector Derived class of this class. 92 * @tparam TNodes Are we interested in member nodes? 93 * @tparam TWays Are we interested in member ways? 94 * @tparam TRelations Are we interested in member relations? 95 * @pre The Ids of all objects must be unique in the input data. 96 */ 97 template <typename TCollector, bool TNodes, bool TWays, bool TRelations> 98 class Collector { 99 100 /** 101 * This is the handler class for the first pass of the Collector. 102 */ 103 class HandlerPass1 : public osmium::handler::Handler { 104 105 TCollector& m_collector; 106 107 public: 108 HandlerPass1(TCollector & collector)109 explicit HandlerPass1(TCollector& collector) noexcept : 110 m_collector(collector) { 111 } 112 relation(const osmium::Relation & relation)113 void relation(const osmium::Relation& relation) { 114 if (m_collector.keep_relation(relation)) { 115 m_collector.add_relation(relation); 116 } 117 } 118 119 }; // class HandlerPass1 120 121 public: 122 123 /** 124 * This is the handler class for the second pass of the Collector. 125 */ 126 class HandlerPass2 : public osmium::handler::Handler { 127 128 osmium::handler::CheckOrder m_check_order; 129 TCollector& m_collector; 130 131 public: 132 HandlerPass2(TCollector & collector)133 explicit HandlerPass2(TCollector& collector) noexcept : 134 m_collector(collector) { 135 } 136 node(const osmium::Node & node)137 void node(const osmium::Node& node) { 138 if (TNodes) { 139 m_check_order.node(node); 140 if (!m_collector.find_and_add_object(node)) { 141 m_collector.node_not_in_any_relation(node); 142 } 143 } 144 } 145 way(const osmium::Way & way)146 void way(const osmium::Way& way) { 147 if (TWays) { 148 m_check_order.way(way); 149 if (!m_collector.find_and_add_object(way)) { 150 m_collector.way_not_in_any_relation(way); 151 } 152 } 153 } 154 relation(const osmium::Relation & relation)155 void relation(const osmium::Relation& relation) { 156 if (TRelations) { 157 m_check_order.relation(relation); 158 if (!m_collector.find_and_add_object(relation)) { 159 m_collector.relation_not_in_any_relation(relation); 160 } 161 } 162 } 163 flush()164 void flush() { 165 m_collector.flush(); 166 } 167 168 }; // class HandlerPass2 169 170 private: 171 172 HandlerPass2 m_handler_pass2; 173 174 // All relations we are interested in will be kept in this buffer 175 osmium::memory::Buffer m_relations_buffer; 176 177 // All members we are interested in will be kept in this buffer 178 osmium::memory::Buffer m_members_buffer; 179 180 /// Vector with all relations we are interested in 181 std::vector<RelationMeta> m_relations; 182 183 /** 184 * One vector each for nodes, ways, and relations containing all 185 * mappings from member ids to their relations. 186 */ 187 using mm_vector_type = std::vector<MemberMeta>; 188 using mm_iterator = mm_vector_type::iterator; 189 std::array<mm_vector_type, 3> m_member_meta; 190 191 int m_count_complete = 0; 192 193 using callback_func_type = std::function<void(osmium::memory::Buffer&&)>; 194 callback_func_type m_callback; 195 196 enum { 197 initial_buffer_size = 1024UL * 1024UL 198 }; 199 find_member_meta(osmium::item_type type,osmium::object_id_type id)200 iterator_range<mm_iterator> find_member_meta(osmium::item_type type, osmium::object_id_type id) { 201 auto& mmv = member_meta(type); 202 return make_range(std::equal_range(mmv.begin(), mmv.end(), MemberMeta(id))); 203 } 204 205 public: 206 207 /** 208 * Create an Collector. 209 */ Collector()210 Collector() : 211 m_handler_pass2(*static_cast<TCollector*>(this)), 212 m_relations_buffer(initial_buffer_size, osmium::memory::Buffer::auto_grow::yes), 213 m_members_buffer(initial_buffer_size, osmium::memory::Buffer::auto_grow::yes) { 214 } 215 216 protected: 217 member_meta(const item_type type)218 std::vector<MemberMeta>& member_meta(const item_type type) { 219 return m_member_meta[static_cast<uint16_t>(type) - 1]; 220 } 221 callback()222 callback_func_type callback() { 223 return m_callback; 224 } 225 relations() const226 const std::vector<RelationMeta>& relations() const { 227 return m_relations; 228 } 229 230 /** 231 * This method is called from the first pass handler for every 232 * relation in the input, to check whether it should be kept. 233 * 234 * Overwrite this method in a child class to only add relations 235 * you are interested in, for instance depending on the type tag. 236 * Storing relations takes a lot of memory, so it makes sense to 237 * filter this as much as possible. 238 */ keep_relation(const osmium::Relation &) const239 bool keep_relation(const osmium::Relation& /*relation*/) const { 240 return true; 241 } 242 243 /** 244 * This method is called for every member of every relation that 245 * should be kept. It should decide if the member is interesting or 246 * not and return true or false to signal that. Only interesting 247 * members are later added to the relation. 248 * 249 * Overwrite this method in a child class. In the MultiPolygonCollector 250 * this is for instance used to only keep members of type way and 251 * ignore all others. 252 */ keep_member(const RelationMeta &,const osmium::RelationMember &) const253 bool keep_member(const RelationMeta& /*relation_meta*/, const osmium::RelationMember& /*member*/) const { 254 return true; 255 } 256 257 /** 258 * This method is called for all nodes that are not a member of 259 * any relation. 260 * 261 * Overwrite this method in a child class if you are interested 262 * in this. 263 */ node_not_in_any_relation(const osmium::Node &)264 void node_not_in_any_relation(const osmium::Node& /*node*/) { 265 } 266 267 /** 268 * This method is called for all ways that are not a member of 269 * any relation. 270 * 271 * Overwrite this method in a child class if you are interested 272 * in this. 273 */ way_not_in_any_relation(const osmium::Way &)274 void way_not_in_any_relation(const osmium::Way& /*way*/) { 275 } 276 277 /** 278 * This method is called for all relations that are not a member of 279 * any relation. 280 * 281 * Overwrite this method in a child class if you are interested 282 * in this. 283 */ relation_not_in_any_relation(const osmium::Relation &)284 void relation_not_in_any_relation(const osmium::Relation& /*relation*/) { 285 } 286 287 /** 288 * This method is called from the 2nd pass handler when all objects 289 * of types we are interested in have been seen. 290 * 291 * Overwrite this method in a child class if you are interested 292 * in this. 293 * 294 * Note that even after this call members might be missing if they 295 * were not in the input file! The derived class has to handle this 296 * case. 297 */ flush()298 void flush() { 299 } 300 get_relation(size_t offset) const301 const osmium::Relation& get_relation(size_t offset) const { 302 assert(m_relations_buffer.committed() > offset); 303 return m_relations_buffer.get<osmium::Relation>(offset); 304 } 305 306 /** 307 * Get the relation from a relation_meta. 308 */ get_relation(const RelationMeta & relation_meta) const309 const osmium::Relation& get_relation(const RelationMeta& relation_meta) const { 310 return get_relation(relation_meta.relation_offset()); 311 } 312 313 /** 314 * Get the relation from a member_meta. 315 */ get_relation(const MemberMeta & member_meta) const316 const osmium::Relation& get_relation(const MemberMeta& member_meta) const { 317 return get_relation(m_relations[member_meta.relation_pos()]); 318 } 319 get_member(size_t offset) const320 osmium::OSMObject& get_member(size_t offset) const { 321 assert(m_members_buffer.committed() > offset); 322 return m_members_buffer.get<osmium::OSMObject>(offset); 323 } 324 325 private: 326 327 /** 328 * Tell the Collector that you are interested in this relation 329 * and want it kept until all members have been assembled and 330 * it is handed back to you. 331 * 332 * The relation is copied and stored in a buffer inside the 333 * collector. 334 */ add_relation(const osmium::Relation & relation)335 void add_relation(const osmium::Relation& relation) { 336 const size_t offset = m_relations_buffer.committed(); 337 m_relations_buffer.add_item(relation); 338 339 RelationMeta relation_meta{offset}; 340 341 int n = 0; 342 for (auto& member : m_relations_buffer.get<osmium::Relation>(offset).members()) { 343 if (static_cast<TCollector*>(this)->keep_member(relation_meta, member)) { 344 member_meta(member.type()).emplace_back(member.ref(), m_relations.size(), n); 345 relation_meta.increment_need_members(); 346 } else { 347 member.set_ref(0); // set member id to zero to indicate we are not interested 348 } 349 ++n; 350 } 351 352 assert(offset == m_relations_buffer.committed()); 353 if (relation_meta.has_all_members()) { 354 m_relations_buffer.rollback(); 355 } else { 356 m_relations_buffer.commit(); 357 m_relations.push_back(relation_meta); 358 } 359 } 360 361 /** 362 * Sort the vectors with the member infos so that we can do binary 363 * search on them. 364 */ sort_member_meta()365 void sort_member_meta() { 366 std::sort(m_member_meta[0].begin(), m_member_meta[0].end()); 367 std::sort(m_member_meta[1].begin(), m_member_meta[1].end()); 368 std::sort(m_member_meta[2].begin(), m_member_meta[2].end()); 369 } 370 count_not_removed(const iterator_range<mm_iterator> & range)371 static typename iterator_range<mm_iterator>::iterator::difference_type count_not_removed(const iterator_range<mm_iterator>& range) { 372 return std::count_if(range.begin(), range.end(), [](const MemberMeta& mm) { 373 return !mm.removed(); 374 }); 375 } 376 377 /** 378 * Find this object in the member vectors and add it to all 379 * relations that need it. 380 * 381 * @returns true if the member was added to at least one 382 * relation and false otherwise 383 */ find_and_add_object(const osmium::OSMObject & object)384 bool find_and_add_object(const osmium::OSMObject& object) { 385 auto range = find_member_meta(object.type(), object.id()); 386 387 if (count_not_removed(range) == 0) { 388 // nothing found 389 return false; 390 } 391 392 { 393 members_buffer().add_item(object); 394 const size_t member_offset = members_buffer().commit(); 395 396 for (auto& member : range) { 397 member.set_buffer_offset(member_offset); 398 } 399 } 400 401 for (auto& member : range) { 402 if (member.removed()) { 403 break; 404 } 405 assert(member.member_id() == object.id()); 406 assert(member.relation_pos() < m_relations.size()); 407 RelationMeta& relation_meta = m_relations[member.relation_pos()]; 408 assert(member.member_pos() < get_relation(relation_meta).members().size()); 409 relation_meta.got_one_member(); 410 if (relation_meta.has_all_members()) { 411 const size_t relation_offset = member.relation_pos(); 412 static_cast<TCollector*>(this)->complete_relation(relation_meta); 413 clear_member_metas(relation_meta); 414 m_relations[relation_offset] = RelationMeta{}; 415 possibly_purge_removed_members(); 416 } 417 } 418 419 return true; 420 } 421 clear_member_metas(const RelationMeta & relation_meta)422 void clear_member_metas(const RelationMeta& relation_meta) { 423 const osmium::Relation& relation = get_relation(relation_meta); 424 for (const auto& member : relation.members()) { 425 if (member.ref() != 0) { 426 const auto range = find_member_meta(member.type(), member.ref()); 427 assert(!range.empty()); 428 429 // if this is the last time this object was needed 430 // then mark it as removed 431 if (count_not_removed(range) == 1) { 432 get_member(range.begin()->buffer_offset()).set_removed(true); 433 } 434 435 for (auto& member_meta : range) { 436 if (!member_meta.removed() && relation.id() == get_relation(member_meta).id()) { 437 member_meta.remove(); 438 break; 439 } 440 } 441 } 442 } 443 } 444 445 public: 446 used_memory() const447 uint64_t used_memory() const { 448 const uint64_t nmembers = m_member_meta[0].capacity() + m_member_meta[1].capacity() + m_member_meta[2].capacity(); 449 const uint64_t members = nmembers * sizeof(MemberMeta); 450 const uint64_t relations_size = m_relations.capacity() * sizeof(RelationMeta); 451 const uint64_t relations_buffer_capacity = m_relations_buffer.capacity(); 452 const uint64_t members_buffer_capacity = m_members_buffer.capacity(); 453 454 std::cerr << " nR = m_relations.capacity() ........... = " << std::setw(12) << m_relations.capacity() << "\n"; 455 std::cerr << " nMN = m_member_meta[NODE].capacity() ... = " << std::setw(12) << m_member_meta[0].capacity() << "\n"; 456 std::cerr << " nMW = m_member_meta[WAY].capacity() .... = " << std::setw(12) << m_member_meta[1].capacity() << "\n"; 457 std::cerr << " nMR = m_member_meta[RELATION].capacity() = " << std::setw(12) << m_member_meta[2].capacity() << "\n"; 458 std::cerr << " nM = m_member_meta[*].capacity() ...... = " << std::setw(12) << nmembers << "\n"; 459 460 std::cerr << " sRM = sizeof(RelationMeta) ............. = " << std::setw(12) << sizeof(RelationMeta) << "\n"; 461 std::cerr << " sMM = sizeof(MemberMeta) ............... = " << std::setw(12) << sizeof(MemberMeta) << "\n\n"; 462 463 std::cerr << " nR * sRM ............................... = " << std::setw(12) << relations_size << "\n"; 464 std::cerr << " nM * sMM ............................... = " << std::setw(12) << members << "\n"; 465 std::cerr << " relations_buffer_capacity .............. = " << std::setw(12) << relations_buffer_capacity << "\n"; 466 std::cerr << " members_buffer_capacity ................ = " << std::setw(12) << members_buffer_capacity << "\n"; 467 468 const uint64_t total = relations_size + members + relations_buffer_capacity + members_buffer_capacity; 469 470 std::cerr << " total .................................. = " << std::setw(12) << total << "\n"; 471 std::cerr << " =======================================================\n"; 472 473 return relations_buffer_capacity + members_buffer_capacity + relations_size + members; 474 } 475 476 /** 477 * Return reference to second pass handler. 478 */ handler(const callback_func_type & callback=nullptr)479 HandlerPass2& handler(const callback_func_type& callback = nullptr) { 480 m_callback = callback; 481 return m_handler_pass2; 482 } 483 members_buffer()484 osmium::memory::Buffer& members_buffer() { 485 return m_members_buffer; 486 } 487 488 /** 489 * Is the given member available in the members buffer? 490 * 491 * If you also need the offset of the object, use 492 * get_availability_and_offset() instead, it is more efficient 493 * that way. 494 * 495 * @param type Item type 496 * @param id Object Id 497 * @returns True if the object is available, false otherwise. 498 */ is_available(osmium::item_type type,osmium::object_id_type id)499 bool is_available(osmium::item_type type, osmium::object_id_type id) { 500 const auto range = find_member_meta(type, id); 501 assert(!range.empty()); 502 return range.begin()->is_available(); 503 } 504 505 /** 506 * Get offset of a member in the members buffer. 507 * 508 * @pre The member must be available. If you are not sure, call 509 * get_availability_and_offset() instead. 510 * @param type Item type 511 * @param id Object Id 512 * @returns The offset of the object in the members buffer. 513 */ get_offset(osmium::item_type type,osmium::object_id_type id)514 size_t get_offset(osmium::item_type type, osmium::object_id_type id) { 515 const auto range = find_member_meta(type, id); 516 assert(!range.empty()); 517 assert(range.begin()->is_available()); 518 return range.begin()->buffer_offset(); 519 } 520 521 /** 522 * Checks whether a member is available in the members buffer 523 * and returns its offset. 524 * 525 * If the member is not available, the boolean returned as the 526 * first element in the pair is false. In that case the offset 527 * in the second element is undefined. 528 * 529 * If the member is available, the boolean returned as the first 530 * element in the pair is true and the second element of the 531 * pair contains the offset into the members buffer. 532 * 533 * @param type Item type 534 * @param id Object Id 535 * @returns Pair of bool (showing availability) and the offset. 536 */ get_availability_and_offset(osmium::item_type type,osmium::object_id_type id)537 std::pair<bool, size_t> get_availability_and_offset(osmium::item_type type, osmium::object_id_type id) { 538 const auto range = find_member_meta(type, id); 539 assert(!range.empty()); 540 if (range.begin()->is_available()) { 541 return std::make_pair(true, range.begin()->buffer_offset()); 542 } 543 return std::make_pair(false, 0); 544 } 545 546 template <typename TIter> read_relations(TIter begin,TIter end)547 void read_relations(TIter begin, TIter end) { 548 HandlerPass1 handler_pass1{*static_cast<TCollector*>(this)}; 549 osmium::apply(begin, end, handler_pass1); 550 sort_member_meta(); 551 } 552 553 template <typename TSource> read_relations(TSource & source)554 void read_relations(TSource& source) { 555 using std::begin; 556 using std::end; 557 read_relations(begin(source), end(source)); 558 source.close(); 559 } 560 moving_in_buffer(size_t old_offset,size_t new_offset)561 void moving_in_buffer(size_t old_offset, size_t new_offset) { 562 const osmium::OSMObject& object = m_members_buffer.get<osmium::OSMObject>(old_offset); 563 auto range = find_member_meta(object.type(), object.id()); 564 for (auto& member : range) { 565 assert(member.buffer_offset() == old_offset); 566 member.set_buffer_offset(new_offset); 567 } 568 } 569 570 /** 571 * Decide whether to purge removed members and then do it. 572 * 573 * Currently the purging is done every 10000 calls. 574 * This could probably be improved upon. 575 */ possibly_purge_removed_members()576 void possibly_purge_removed_members() { 577 ++m_count_complete; 578 if (m_count_complete > 10000) { // XXX 579 // const size_t size_before = m_members_buffer.committed(); 580 m_members_buffer.purge_removed(this); 581 /* 582 const size_t size_after = m_members_buffer.committed(); 583 double percent = static_cast<double>(size_before - size_after); 584 percent /= size_before; 585 percent *= 100; 586 std::cerr << "PURGE (size before=" << size_before << " after=" << size_after << " purged=" << (size_before - size_after) << " / " << static_cast<int>(percent) << "%)\n"; 587 */ 588 m_count_complete = 0; 589 } 590 } 591 592 /** 593 * Get a vector with pointers to all Relations that could not 594 * be completed, because members were missing in the input 595 * data. 596 * 597 * Note that these pointers point into memory allocated and 598 * owned by the Collector object. 599 */ get_incomplete_relations() const600 std::vector<const osmium::Relation*> get_incomplete_relations() const { 601 std::vector<const osmium::Relation*> incomplete_relations; 602 for (const auto& relation_meta : m_relations) { 603 if (!relation_meta.has_all_members()) { 604 incomplete_relations.push_back(&get_relation(relation_meta)); 605 } 606 } 607 return incomplete_relations; 608 } 609 610 }; // class Collector 611 612 } // namespace relations 613 614 } // namespace osmium 615 616 #endif // OSMIUM_RELATIONS_COLLECTOR_HPP 617