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/*PGR-GNU*****************************************************************
File: breadthFirstSearch.sql
Copyright (c) 2019 pgRouting developers
Mail: project@pgrouting.org
Function's developer:
Copyright (c) 2019 Gudesa Venkata Sai Akhil
Mail: gvs.akhil1997@gmail.com
------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
********************************************************************PGR-GNU*/
------------------
-- pgr_breadthFirstSearch
------------------
--ONE TO DEPTH
--v3.0
CREATE FUNCTION pgr_breadthFirstSearch(
TEXT, -- edges_sql (required)
BIGINT, -- from_vid (required)
max_depth BIGINT DEFAULT 9223372036854775807,
directed BOOLEAN DEFAULT true,
OUT seq BIGINT,
OUT depth BIGINT,
OUT start_vid BIGINT,
OUT node BIGINT,
OUT edge BIGINT,
OUT cost FLOAT,
OUT agg_cost FLOAT)
RETURNS SETOF RECORD AS
$BODY$
BEGIN
IF $3 < 0 THEN
RAISE EXCEPTION 'Negative value found on ''max_depth'''
USING HINT = format('Value found: %s', $3);
END IF;
RETURN QUERY
SELECT *
FROM _pgr_breadthFirstSearch(_pgr_get_statement($1), ARRAY[$2]::BIGINT[], max_depth, directed) AS a;
END;
$BODY$
LANGUAGE plpgsql VOLATILE STRICT;
--MANY TO DEPTH
--v3.0
CREATE FUNCTION pgr_breadthFirstSearch(
TEXT, -- edges_sql (required)
ANYARRAY, -- from_vids (required)
max_depth BIGINT DEFAULT 9223372036854775807,
directed BOOLEAN DEFAULT true,
OUT seq BIGINT,
OUT depth BIGINT,
OUT start_vid BIGINT,
OUT node BIGINT,
OUT edge BIGINT,
OUT cost FLOAT,
OUT agg_cost FLOAT)
RETURNS SETOF RECORD AS
$BODY$
BEGIN
IF $3 < 0 THEN
RAISE EXCEPTION 'Negative value found on ''max_depth'''
USING HINT = format('Value found: %s', $3);
END IF;
RETURN QUERY
SELECT *
FROM _pgr_breadthFirstSearch(_pgr_get_statement($1), $2::BIGINT[], max_depth, directed) AS a;
END;
$BODY$
LANGUAGE plpgsql VOLATILE STRICT;
-- COMMENTS
COMMENT ON FUNCTION pgr_breadthFirstSearch(TEXT, BIGINT, BIGINT, BOOLEAN)
IS 'pgr_breadthFirstSearch(One to Depth)
- EXPERIMENTAL
- Parameters:
- edges SQL with columns: id, source, target, cost [,reverse_cost]
- From vertex identifier
- Optional Parameters:
- Maximum Depth := 9223372036854775807
- directed := true
- Documentation:
- ${PROJECT_DOC_LINK}/pgr_breadthFirstSearch.html
';
COMMENT ON FUNCTION pgr_breadthFirstSearch(TEXT, ANYARRAY, BIGINT, BOOLEAN)
IS 'pgr_breadthFirstSearch(Many to Depth)
- EXPERIMENTAL
- Parameters:
- Edges SQL with columns: id, source, target, cost [,reverse_cost]
- From ARRAY[vertices identifiers]
- Optional Parameters
- Maximum Depth := 9223372036854775807
- directed := true
- Documentation:
- ${PROJECT_DOC_LINK}/pgr_breadthFirstSearch.html
';
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