1 | -- |
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2 | -- Copyright (c) 2005 Sylvain Pasche, |
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3 | -- 2006-2007 Anton A. Patrushev, Orkney, Inc. |
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4 | -- |
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5 | -- This program is free software; you can redistribute it and/or modify |
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6 | -- it under the terms of the GNU General Public License as published by |
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7 | -- the Free Software Foundation; either version 2 of the License, or |
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8 | -- (at your option) any later version. |
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9 | -- |
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10 | -- This program is distributed in the hope that it will be useful, |
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11 | -- but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | -- GNU General Public License for more details. |
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14 | -- |
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15 | -- You should have received a copy of the GNU General Public License |
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16 | -- along with this program; if not, write to the Free Software |
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17 | -- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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18 | -- |
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19 | |
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20 | |
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21 | CREATE TYPE path_result AS (vertex_id integer, edge_id integer, cost float8); |
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22 | CREATE TYPE vertex_result AS (x float8, y float8); |
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23 | |
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24 | ----------------------------------------------------------------------- |
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25 | -- Core function for shortest_path computation |
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26 | -- See README for description |
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27 | ----------------------------------------------------------------------- |
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28 | CREATE OR REPLACE FUNCTION shortest_path(sql text, source_id integer, |
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29 | target_id integer, directed boolean, has_reverse_cost boolean) |
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30 | RETURNS SETOF path_result |
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31 | AS '$libdir/librouting' |
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32 | LANGUAGE 'C' IMMUTABLE STRICT; |
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33 | |
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34 | ----------------------------------------------------------------------- |
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35 | -- Core function for shortest_path_astar computation |
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36 | -- Simillar to shortest_path in usage but uses the A* algorithm |
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37 | -- instead of Dijkstra's. |
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38 | ----------------------------------------------------------------------- |
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39 | CREATE OR REPLACE FUNCTION shortest_path_astar(sql text, source_id integer, |
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40 | target_id integer,directed boolean, has_reverse_cost boolean) |
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41 | RETURNS SETOF path_result |
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42 | AS '$libdir/librouting' |
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43 | LANGUAGE 'C' IMMUTABLE STRICT; |
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44 | |
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45 | ----------------------------------------------------------------------- |
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46 | -- Core function for shortest_path_astar computation |
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47 | -- Simillar to shortest_path in usage but uses the Shooting* algorithm |
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48 | ----------------------------------------------------------------------- |
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49 | CREATE OR REPLACE FUNCTION shortest_path_shooting_star(sql text, source_id integer, |
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50 | target_id integer,directed boolean, has_reverse_cost boolean) |
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51 | RETURNS SETOF path_result |
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52 | AS '$libdir/librouting' |
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53 | LANGUAGE 'C' IMMUTABLE STRICT; |
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54 | |
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55 | ----------------------------------------------------------------------- |
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56 | -- This function should not be used directly. Use create_graph_tables instead |
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57 | -- |
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58 | -- Insert a vertex into the vertices table if not already there, and |
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59 | -- return the id of the newly inserted or already existing element |
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60 | ----------------------------------------------------------------------- |
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61 | CREATE OR REPLACE FUNCTION insert_vertex(vertices_table varchar, |
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62 | geom_id anyelement) |
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63 | RETURNS int AS |
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64 | $$ |
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65 | DECLARE |
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66 | vertex_id int; |
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67 | myrec record; |
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68 | BEGIN |
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69 | LOOP |
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70 | FOR myrec IN EXECUTE 'SELECT id FROM ' || |
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71 | quote_ident(vertices_table) || |
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72 | ' WHERE geom_id = ' || quote_literal(geom_id) LOOP |
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73 | |
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74 | IF myrec.id IS NOT NULL THEN |
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75 | RETURN myrec.id; |
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76 | END IF; |
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77 | END LOOP; |
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78 | EXECUTE 'INSERT INTO ' || quote_ident(vertices_table) || |
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79 | ' (geom_id) VALUES (' || quote_literal(geom_id) || ')'; |
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80 | END LOOP; |
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81 | END; |
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82 | $$ |
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83 | LANGUAGE 'plpgsql' VOLATILE STRICT; |
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