pggeodb.nancy.inra.fr/db_toff - db_toff on pggeodb.nancy.inra.fr

Function: geometry

Schema

topology

Owner

postgres

Descriptions

There is no description for function geometry

Options

Definition

CREATE OR REPLACE FUNCTION topology.geometry (
 topogeom topology.topogeometry
)
RETURNS public.geometry AS
$span$
DECLARE
 toponame varchar;
 geom geometry;
 rec RECORD;
 plyr RECORD;
 clyr RECORD;
 sql TEXT;
BEGIN

 -- Get topology name
 SELECT name FROM topology.topology
 WHERE id = topogeom.topology_id
 INTO toponame;
 IF toponame IS NULL THEN
   RAISE EXCEPTION 'Invalid TopoGeometry (unexistent topology id %)', topogeom.topology_id;
 END IF;

 -- Get layer info
 SELECT * FROM topology.layer
   WHERE topology_id = topogeom.topology_id
   AND layer_id = topogeom.layer_id
   INTO plyr;
 IF plyr IS NULL THEN
   RAISE EXCEPTION 'Could not find TopoGeometry layer % in topology %', topogeom.layer_id, topogeom.topology_id;
 END IF;

 --
 -- If this feature layer is on any level > 0 we will
 -- compute the topological union of all child features
 -- in fact recursing.
 --
 IF plyr.level > 0 THEN -- {

   -- Get child layer info
   SELECT * FROM topology.layer WHERE layer_id = plyr.child_id
     AND topology_id = topogeom.topology_id
     INTO clyr;
   IF clyr IS NULL THEN
     RAISE EXCEPTION 'Invalid layer % in topology % (unexistent child layer %)', topogeom.layer_id, topogeom.topology_id, plyr.child_id;
   END IF;

   sql := 'SELECT st_multi(st_union(topology.Geometry('
     || quote_ident(clyr.feature_column)
     || '))) as geom FROM '
     || quote_ident(clyr.schema_name) || '.'
     || quote_ident(clyr.table_name)
     || ', ' || quote_ident(toponame) || '.relation pr'
        ' WHERE '
        ' pr.topogeo_id = ' || topogeom.id
     || ' AND '
        ' pr.layer_id = ' || topogeom.layer_id
     || ' AND '
        ' id('||quote_ident(clyr.feature_column)
     || ') = pr.element_id '
        ' AND '
        'layer_id('||quote_ident(clyr.feature_column)
     || ') = pr.element_type ';
   --RAISE DEBUG '%', query;
   EXECUTE sql INTO geom;
     
 ELSIF topogeom.type = 3 THEN -- [multi]polygon -- }{

   sql := 'SELECT st_multi(st_union('
        'topology.ST_GetFaceGeometry('
     || quote_literal(toponame) || ','
     || 'element_id))) as g FROM '
     || quote_ident(toponame)
     || '.relation WHERE topogeo_id = '
     || topogeom.id || ' AND layer_id = '
     || topogeom.layer_id || ' AND element_type = 3 ';
   EXECUTE sql INTO geom;

 ELSIF topogeom.type = 2 THEN -- [multi]line -- }{

   sql :=
     'SELECT st_multi(ST_LineMerge(ST_Collect(e.geom))) as g FROM '
     || quote_ident(toponame) || '.edge e, '
     || quote_ident(toponame) || '.relation r '
        ' WHERE r.topogeo_id = ' || topogeom.id
     || ' AND r.layer_id = ' || topogeom.layer_id
     || ' AND r.element_type = 2 '
        ' AND abs(r.element_id) = e.edge_id';
   EXECUTE sql INTO geom;
 
 ELSIF topogeom.type = 1 THEN -- [multi]point -- }{

   sql :=
     'SELECT st_multi(st_union(n.geom)) as g FROM '
     || quote_ident(toponame) || '.node n, '
     || quote_ident(toponame) || '.relation r '
        ' WHERE r.topogeo_id = ' || topogeom.id
     || ' AND r.layer_id = ' || topogeom.layer_id
     || ' AND r.element_type = 1 '
        ' AND r.element_id = n.node_id';
   EXECUTE sql INTO geom;

 ELSIF topogeom.type = 4 THEN -- mixed collection -- }{

   sql := 'WITH areas AS ( SELECT ST_Union('
        'topology.ST_GetFaceGeometry('
     || quote_literal(toponame) || ','
     || 'element_id)) as g FROM '
     || quote_ident(toponame)
     || '.relation WHERE topogeo_id = '
     || topogeom.id || ' AND layer_id = '
     || topogeom.layer_id || ' AND element_type = 3), '
        'lines AS ( SELECT ST_LineMerge(ST_Collect(e.geom)) as g FROM '
     || quote_ident(toponame) || '.edge e, '
     || quote_ident(toponame) || '.relation r '
        ' WHERE r.topogeo_id = ' || topogeom.id
     || ' AND r.layer_id = ' || topogeom.layer_id
     || ' AND r.element_type = 2 '
        ' AND abs(r.element_id) = e.edge_id ), '
        ' points as ( SELECT st_union(n.geom) as g FROM '
     || quote_ident(toponame) || '.node n, '
     || quote_ident(toponame) || '.relation r '
        ' WHERE r.topogeo_id = ' || topogeom.id
     || ' AND r.layer_id = ' || topogeom.layer_id
     || ' AND r.element_type = 1 '
        ' AND r.element_id = n.node_id ), '
        ' un as ( SELECT g FROM areas UNION ALL SELECT g FROM lines '
        '          UNION ALL SELECT g FROM points ) '
        'SELECT ST_Multi(ST_Collect(g)) FROM un';
   EXECUTE sql INTO geom;

 ELSE -- }{

   RAISE EXCEPTION 'Invalid TopoGeometries (unknown type %)', topogeom.type;

 END IF; -- }

 IF geom IS NULL THEN
   IF topogeom.type = 3 THEN -- [multi]polygon
     geom := 'MULTIPOLYGON EMPTY';
   ELSIF topogeom.type = 2 THEN -- [multi]line
     geom := 'MULTILINESTRING EMPTY';
   ELSIF topogeom.type = 1 THEN -- [multi]point
     geom := 'MULTIPOINT EMPTY';
   ELSE
     geom := 'GEOMETRYCOLLECTION EMPTY';
   END IF;
 END IF;

 RETURN geom;
END
$span$
LANGUAGE 'plpgsql'
VOLATILE
RETURNS NULL ON NULL INPUT
SECURITY INVOKER
COST 100;

This file was generated with SQL Manager for PostgreSQL (www.pgsqlmanager.com) at 13/03/2014 13:23