2 * Navit, a modular navigation system.
3 * Copyright (C) 2005-2008 Navit Team
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * version 2 as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
22 * @brief Contains code used for loading more than one map
24 * The code in this file introduces "mapsets", which are collections of several maps.
25 * This enables navit to operate on more than one map at once. See map.c / map.h to learn
26 * how maps are handled.
31 #include <glib/gprintf.h>
35 #include "projection.h"
41 * This structure holds a complete mapset
44 GList *maps; /**< Linked list of all the maps in the mapset */
48 * @brief Creates a new, empty mapset
50 * @return The new mapset
52 struct mapset *mapset_new(void)
56 ms=g_new0(struct mapset, 1);
62 * @brief Adds a map to a mapset
64 * @param ms The mapset to add the map to
65 * @param m The map to be added
67 void mapset_add(struct mapset *ms, struct map *m)
69 ms->maps=g_list_append(ms->maps, m);
73 static void mapset_maps_free(struct mapset *ms)
80 * @brief Destroys a mapset.
82 * This destroys a mapset. Please note that it does not touch the contained maps
85 * @param ms The mapset to be destroyed
87 void mapset_destroy(struct mapset *ms)
93 * @brief Handle for a mapset in use
95 * This struct is used for a mapset that is in use. With this it is possible to iterate
96 * all maps in a mapset.
98 struct mapset_handle {
99 GList *l; /**< Pointer to the current (next) map */
103 * @brief Returns a new handle for a mapset
105 * This returns a new handle for an existing mapset. The new handle points to the first
108 * @param ms The mapset to get a handle of
109 * @return The new mapset handle
111 struct mapset_handle *
112 mapset_open(struct mapset *ms)
114 struct mapset_handle *ret;
116 ret=g_new(struct mapset_handle, 1);
123 * @brief Gets the next map from a mapset handle
125 * If you set active to true, this function will not return any maps that
126 * have the attr_active attribute associated with them and set to false.
128 * @param msh The mapset handle to get the next map of
129 * @param active Set to true to only get active maps (See description)
130 * @return The next map
132 struct map * mapset_next(struct mapset_handle *msh, int active)
135 struct attr active_attr;
141 msh->l=g_list_next(msh->l);
144 if (!map_get_attr(ret, attr_active, &active_attr, NULL))
146 if (active_attr.u.num)
152 * @brief Closes a mapset handle after it is no longer used
154 * @param msh Mapset handle to be closed
157 mapset_close(struct mapset_handle *msh)
163 * @brief Holds information about a search in a mapset
165 * This struct holds information about a search (e.g. for a street) in a mapset.
167 * @sa For a more detailed description see the documentation of mapset_search_new().
169 struct mapset_search {
170 GList *map; /**< The list of maps to be searched within */
171 struct map_search *ms; /**< A map search struct for the map currently active */
172 struct item *item; /**< "Superior" item. */
173 struct attr *search_attr; /**< Attribute to be searched for. */
174 int partial; /**< Indicates if one would like to have partial matches */
178 * @brief Starts a search on a mapset
180 * This function starts a search on a mapset. What attributes one can search for depends on the
181 * map plugin. See the description of map_search_new() in map.c for details.
183 * If you enable partial matches bear in mind that the search matches only the begin of the
184 * strings - a search for a street named "street" would match to "streetfoo", but not to
185 * "somestreet". Search is case insensitive.
187 * The item passed to this function specifies a "superior item" to "search within" - e.g. a town
188 * in which we want to search for a street, or a country in which to search for a town.
190 * @param ms The mapset that should be searched
191 * @param item Specifies a superior item to "search within" (see description)
192 * @param search_attr Attribute specifying what to search for. See description.
193 * @param partial Set this to true to also have partial matches. See description.
194 * @return A new mapset search struct for this search
196 struct mapset_search *
197 mapset_search_new(struct mapset *ms, struct item *item, struct attr *search_attr, int partial)
199 struct mapset_search *this;
200 dbg(1,"enter(%p,%p,%p,%d)\n", ms, item, search_attr, partial);
201 this=g_new0(struct mapset_search,1);
204 this->search_attr=search_attr;
205 this->partial=partial;
206 this->ms=map_search_new(this->map->data, item, search_attr, partial);
211 * @brief Returns the next found item from a mapset search
213 * This function returns the next item from a mapset search or NULL if there are no more items found.
214 * It automatically iterates through all the maps in the mapset. Please note that maps which have the
215 * attr_active attribute associated with them and set to false are not searched.
217 * @param this The mapset search to return an item from
218 * @return The next found item or NULL if there are no more items found
221 mapset_search_get_item(struct mapset_search *this)
223 struct item *ret=NULL;
224 struct attr active_attr;
226 while (!this->ms || !(ret=map_search_get_item(this->ms))) { /* The current map has no more items to be returned */
227 if (this->search_attr->type >= attr_country_all && this->search_attr->type <= attr_country_name)
230 this->map=g_list_next(this->map);
233 if (!map_get_attr(this->map->data, attr_active, &active_attr, NULL))
235 if (active_attr.u.num)
240 map_search_destroy(this->ms);
241 this->ms=map_search_new(this->map->data, this->item, this->search_attr, this->partial);
247 * @brief Destroys a mapset search
249 * @param this The mapset search to be destroyed
252 mapset_search_destroy(struct mapset_search *this)
255 map_search_destroy(this->ms);