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 int) |
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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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84 | |
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85 | |
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86 | ----------------------------------------------------------------------- |
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87 | -- Create the vertices and edges tables from a table matching the |
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88 | -- geometry schema described above. |
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89 | ----------------------------------------------------------------------- |
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90 | CREATE OR REPLACE FUNCTION create_graph_tables(geom_table varchar) |
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91 | RETURNS void AS |
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92 | $$ |
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93 | BEGIN |
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94 | EXECUTE 'SELECT create_graph_tables('''||quote_ident(geom_table)||''',''int4'',' || '''gid'' ,''source_id'',''target_id'')'; |
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95 | END; |
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96 | $$ |
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97 | LANGUAGE 'plpgsql' VOLATILE STRICT; |
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98 | |
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99 | CREATE OR REPLACE FUNCTION create_graph_tables(geom_table varchar, |
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100 | column_type varchar ) |
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101 | RETURNS void AS |
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102 | $$ |
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103 | BEGIN |
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104 | EXECUTE 'SELECT create_graph_tables('''||quote_ident(geom_table)||''','''||quote_ident(column_type)||''',' || '''gid'' ,''source_id'',''target_id'')'; |
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105 | END; |
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106 | $$ |
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107 | LANGUAGE 'plpgsql' VOLATILE STRICT; |
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108 | |
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109 | CREATE OR REPLACE FUNCTION create_graph_tables(geom_table varchar, |
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110 | column_type varchar , id_name varchar) |
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111 | RETURNS void AS |
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112 | $$ |
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113 | BEGIN |
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114 | EXECUTE 'SELECT create_graph_tables('''||quote_literal(geom_table)||''','''||quote_literal(column_type)||''',''' || quote_literal(id_name) || ''' ,''source_id'',''target_id'')'; |
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115 | RETURN; |
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116 | END; |
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117 | $$ |
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118 | LANGUAGE 'plpgsql' VOLATILE STRICT; |
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119 | |
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120 | |
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121 | |
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122 | |
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123 | CREATE OR REPLACE FUNCTION create_graph_tables(geom_table varchar, |
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124 | column_type varchar, id_name varchar,source_name varchar,target_name varchar) |
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125 | RETURNS void AS |
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126 | $$ |
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127 | DECLARE |
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128 | geom record; |
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129 | edge_id int; |
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130 | myrec record; |
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131 | source_id int; |
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132 | target_id int; |
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133 | vertices_table varchar := quote_ident(geom_table) || '_vertices'; |
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134 | edges_table varchar := quote_ident(geom_table) || '_edges'; |
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135 | BEGIN |
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136 | |
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137 | EXECUTE 'CREATE TABLE ' || vertices_table || |
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138 | ' (id serial, geom_id ' || quote_ident(column_type) || |
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139 | ' NOT NULL UNIQUE)'; |
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140 | |
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141 | EXECUTE 'CREATE INDEX ' || vertices_table || '_id_idx on ' || |
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142 | vertices_table || ' (id)'; |
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143 | |
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144 | EXECUTE 'CREATE TABLE ' || edges_table || |
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145 | ' (id serial, source int, target int, ' || |
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146 | 'cost float8, reverse_cost float8, UNIQUE (source, target))'; |
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147 | |
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148 | EXECUTE 'CREATE INDEX ' || edges_table || |
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149 | '_source_target_idx on ' || edges_table || |
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150 | ' (source, target)'; |
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151 | |
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152 | BEGIN |
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153 | EXECUTE 'ALTER TABLE ' || quote_ident(geom_table) ||' ADD COLUMN edge_id int4'; |
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154 | EXCEPTION |
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155 | WHEN DUPLICATE_COLUMN THEN |
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156 | END; |
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157 | |
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158 | |
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159 | FOR geom IN EXECUTE 'SELECT '|| quote_ident(id_name) ||' as id, ' || |
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160 | quote_ident(source_name) || |
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161 | ' AS source, ' || |
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162 | quote_ident(target_name) || |
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163 | ' AS target FROM ' || quote_ident(geom_table) LOOP |
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164 | |
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165 | SELECT INTO source_id insert_vertex(vertices_table, |
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166 | geom.source); |
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167 | |
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168 | SELECT INTO target_id insert_vertex(vertices_table, |
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169 | geom.target); |
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170 | |
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171 | BEGIN |
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172 | EXECUTE 'INSERT INTO ' || edges_table || |
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173 | ' (source, target) VALUES (' || |
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174 | quote_literal(source_id) || ', ' || |
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175 | quote_literal(target_id) || ')'; |
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176 | |
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177 | EXCEPTION |
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178 | WHEN UNIQUE_VIOLATION THEN |
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179 | END; |
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180 | |
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181 | FOR myrec IN EXECUTE 'SELECT id FROM ' || edges_table || |
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182 | ' e WHERE ' || ' e.source = ' || |
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183 | quote_literal(source_id) || |
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184 | ' and e.target = ' || |
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185 | quote_literal(target_id) LOOP |
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186 | END LOOP; |
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187 | |
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188 | edge_id := myrec.id; |
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189 | |
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190 | IF edge_id IS NULL OR edge_id < 0 THEN |
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191 | RAISE EXCEPTION 'Bad edge id'; |
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192 | END IF; |
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193 | |
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194 | EXECUTE 'UPDATE ' || quote_ident(geom_table) || |
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195 | ' SET edge_id = ' || edge_id || |
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196 | ' WHERE ' || quote_ident(id_name) || ' = ' || geom.id; |
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197 | END LOOP; |
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198 | RETURN; |
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199 | END; |
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200 | $$ |
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201 | LANGUAGE 'plpgsql' VOLATILE STRICT; |
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202 | |
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203 | ----------------------------------------------------------------------- |
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204 | -- Compute the shortest path using edges and vertices table, and return |
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205 | -- the result as a set of (gid integer, the_geom gemoetry) records. |
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206 | -- This function uses the internal vertices identifiers. |
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207 | ----------------------------------------------------------------------- |
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208 | CREATE OR REPLACE FUNCTION shortest_path_as_geometry_internal_id( |
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209 | geom_table varchar, source int4, target int4) |
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210 | RETURNS SETOF GEOMS AS |
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211 | $$ |
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212 | DECLARE |
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213 | r record; |
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214 | path_result record; |
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215 | v_id integer; |
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216 | e_id integer; |
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217 | geom geoms; |
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218 | BEGIN |
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219 | |
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220 | FOR path_result IN EXECUTE 'SELECT gid,the_geom FROM ' || |
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221 | 'shortest_path(''SELECT gid as id, source::integer, target::integer, ' || |
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222 | 'length::double precision as cost FROM ' || |
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223 | quote_ident(geom_table) || ''', ' || quote_literal(source) || |
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224 | ' , ' || quote_literal(target) || ' , false, false), ' || |
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225 | quote_ident(geom_table) || ' where edge_id = gid ' |
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226 | LOOP |
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227 | |
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228 | geom.gid := path_result.gid; |
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229 | geom.the_geom := path_result.the_geom; |
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230 | |
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231 | RETURN NEXT geom; |
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232 | |
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233 | END LOOP; |
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234 | RETURN; |
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235 | END; |
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236 | $$ |
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237 | LANGUAGE 'plpgsql' VOLATILE STRICT; |
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238 | |
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239 | CREATE OR REPLACE FUNCTION shortest_path_as_geometry_internal_id_directed( |
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240 | geom_table varchar, source int4, target int4, dir boolean, rc boolean) |
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241 | RETURNS SETOF GEOMS AS |
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242 | $$ |
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243 | DECLARE |
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244 | r record; |
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245 | path_result record; |
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246 | v_id integer; |
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247 | e_id integer; |
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248 | geom geoms; |
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249 | query text; |
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250 | BEGIN |
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251 | |
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252 | query := 'SELECT gid,the_geom FROM ' || |
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253 | 'shortest_path(''SELECT gid as id, source::integer, target::integer, ' || |
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254 | 'length::double precision as cost '; |
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255 | |
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256 | IF rc THEN query := query || ', reverse_cost '; |
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257 | END IF; |
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258 | |
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259 | query := query || 'FROM ' || quote_ident(geom_table) || ''', ' || quote_literal(source) || |
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260 | ' , ' || quote_literal(target) || ' , '''||dir||''', '''||rc||'''), ' || |
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261 | quote_ident(geom_table) || ' where edge_id = gid '; |
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262 | |
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263 | FOR path_result IN EXECUTE query |
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264 | LOOP |
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265 | |
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266 | geom.gid := path_result.gid; |
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267 | geom.the_geom := path_result.the_geom; |
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268 | |
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269 | RETURN NEXT geom; |
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270 | |
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271 | END LOOP; |
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272 | RETURN; |
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273 | END; |
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274 | $$ |
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275 | LANGUAGE 'plpgsql' VOLATILE STRICT; |
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276 | |
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277 | ----------------------------------------------------------------------- |
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278 | -- Compute the shortest path using edges and vertices table, and return |
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279 | -- the result as a set of (gid integer, the_geom gemoetry) records. |
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280 | ----------------------------------------------------------------------- |
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281 | CREATE OR REPLACE FUNCTION shortest_path_as_geometry(geom_table varchar, |
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282 | geom_source anyelement,geom_target anyelement) |
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283 | RETURNS SETOF GEOMS AS |
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284 | $$ |
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285 | DECLARE |
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286 | r record; |
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287 | source int4; |
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288 | target int4; |
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289 | path_result record; |
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290 | v_id integer; |
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291 | e_id integer; |
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292 | geom geoms; |
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293 | BEGIN |
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294 | FOR r IN EXECUTE 'SELECT id FROM ' || quote_ident(geom_table) || |
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295 | '_vertices WHERE geom_id = ' || quote_literal(geom_source) LOOP |
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296 | |
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297 | source = r.id; |
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298 | |
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299 | END LOOP; |
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300 | |
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301 | IF source IS NULL THEN |
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302 | RAISE EXCEPTION 'Can''t find source edge'; |
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303 | END IF; |
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304 | |
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305 | FOR r IN EXECUTE 'SELECT id FROM ' || quote_ident(geom_table) || |
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306 | '_vertices WHERE geom_id = ' || quote_literal(geom_target) LOOP |
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307 | target = r.id; |
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308 | END LOOP; |
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309 | |
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310 | IF target IS NULL THEN |
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311 | RAISE EXCEPTION 'Can''t find target edge'; |
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312 | END IF; |
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313 | |
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314 | FOR geom IN SELECT * FROM |
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315 | shortest_path_as_geometry_internal_id(geom_table, |
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316 | source, target) LOOP |
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317 | RETURN NEXT geom; |
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318 | END LOOP; |
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319 | |
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320 | RETURN; |
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321 | END; |
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322 | $$ |
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323 | LANGUAGE 'plpgsql' VOLATILE STRICT; |
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324 | |
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325 | |
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326 | |
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