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#!/usr/bin/env python3
#
# -*- coding: utf-8 -*-
# ******************************************************************************
# $Id$
#
# Name: $Id$
# Project:
# Purpose: Build a junction table from _href fields
# Author: Even Rouault, <even dot rouault at spatialys.com>
#
# ******************************************************************************
# Copyright (c) 2013, Even Rouault <even dot rouault at spatialys.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
# ******************************************************************************
import sys
from osgeo import gdal, ogr
def Usage():
print(
"Usage: ogr_build_junction_table.py [-append|-overwrite] datasource_name [layer_name]"
)
print("")
print(
"This utility is aimed at creating junction tables for layers coming from GML datasources"
)
print("that reference other objects in _href fields")
print("")
return 2
def build_junction_table(ds, lyr, ifield, bAppend, bOverwrite):
first_table = lyr.GetName()
second_table = lyr.GetLayerDefn().GetFieldDefn(ifield).GetName()[0:-5]
junction_table_name = first_table + "_" + second_table
gdal.PushErrorHandler("CPLQuietErrorHandler")
junction_lyr = ds.GetLayerByName(junction_table_name)
gdal.PopErrorHandler()
if junction_lyr is not None:
if bOverwrite:
for i in range(ds.GetLayerCount()):
if ds.GetLayer(i).GetName() == junction_table_name:
if ds.DeleteLayer(i) != 0:
print(
"Cannot delete layer %s for recreation"
% junction_table_name
)
return False
else:
junction_lyr = None
break
elif not bAppend:
print("Layer %s already exists" % junction_table_name)
return False
if junction_lyr is None:
junction_lyr = ds.CreateLayer(junction_table_name, geom_type=ogr.wkbNone)
if junction_lyr is None:
print("Cannot create layer %s" % junction_table_name)
return False
print("Creating layer %s..." % junction_table_name)
fld_defn = ogr.FieldDefn(first_table + "_gml_id", ogr.OFTString)
if junction_lyr.CreateField(fld_defn) != 0:
print("Cannot create field %s" % fld_defn.GetName())
return False
fld_defn = ogr.FieldDefn(second_table + "_gml_id", ogr.OFTString)
if junction_lyr.CreateField(fld_defn) != 0:
print("Cannot create field %s" % fld_defn.GetName())
return False
gdal.PushErrorHandler("CPLQuietErrorHandler")
ds.ExecuteSQL(
"CREATE INDEX idx_%s_gml_id ON %s(gml_id)" % (first_table, first_table)
)
ds.ExecuteSQL(
"CREATE INDEX idx_%s_gml_id ON %s(gml_id)" % (second_table, second_table)
)
ds.ExecuteSQL(
"CREATE INDEX idx_%s_gml_id ON %s(%s)"
% (
junction_table_name + "_" + first_table,
junction_table_name,
first_table + "_gml_id",
)
)
ds.ExecuteSQL(
"CREATE INDEX idx_%s_gml_id ON %s(%s)"
% (
junction_table_name + "_" + second_table,
junction_table_name,
second_table + "_gml_id",
)
)
gdal.PopErrorHandler()
lyr.ResetReading()
field_type = lyr.GetLayerDefn().GetFieldDefn(ifield).GetType()
junction_lyr.StartTransaction()
count_features = 0
for feat in lyr:
gml_id = feat.GetFieldAsString("gml_id")
if field_type == ogr.OFTStringList:
href_list = feat.GetFieldAsStringList(ifield)
else:
href = feat.GetFieldAsString(ifield)
if href[0] == "(" and href.find(":") > 0 and href[-1] == ")":
href_list = href[href.find(":") + 1 : -1].split(",")
else:
href_list = [href]
for href in href_list:
target_feature = ogr.Feature(junction_lyr.GetLayerDefn())
target_feature.SetField(0, gml_id)
if href[0] == "#":
href = href[1:]
target_feature.SetField(1, href)
junction_lyr.CreateFeature(target_feature)
target_feature = None
count_features = count_features + 1
if count_features == 200:
junction_lyr.CommitTransaction()
junction_lyr.StartTransaction()
count_features = 0
junction_lyr.CommitTransaction()
return True
def process_layer(ds, lyr_name, bAppend, bOverwrite):
lyr = ds.GetLayerByName(lyr_name)
if lyr is None:
print("Cannot find layer %s in datasource" % lyr_name)
return False
lyr_defn = lyr.GetLayerDefn()
if lyr_defn.GetFieldIndex("gml_id") < 0:
return True
ret = True
for ifield in range(lyr_defn.GetFieldCount()):
if lyr_defn.GetFieldDefn(ifield).GetName().endswith("_href"):
if not build_junction_table(ds, lyr, ifield, bAppend, bOverwrite):
ret = False
return ret
def main(argv=sys.argv):
argv = ogr.GeneralCmdLineProcessor(argv)
ds_name = None
lyr_name = None
bAppend = False
bOverwrite = False
nArgc = len(argv)
iArg = 1
while iArg < nArgc:
if argv[iArg] == "-append":
bAppend = True
elif argv[iArg] == "-overwrite":
bOverwrite = True
elif argv[iArg][0] == "-":
return Usage()
elif ds_name is None:
ds_name = argv[iArg]
elif lyr_name is None:
lyr_name = argv[iArg]
iArg = iArg + 1
if ds_name is None:
return Usage()
if bAppend and bOverwrite:
print("Only one of -append or -overwrite can be used")
return 1
ds = ogr.Open(ds_name, update=1)
if ds is None:
print("Cannot open %s in update mode" % ds_name)
return 1
ret = True
if lyr_name is not None:
ret = process_layer(ds, lyr_name, bAppend, bOverwrite)
else:
for i in range(ds.GetLayerCount()):
if not process_layer(ds, ds.GetLayer(i).GetName(), bAppend, bOverwrite):
ret = False
ds = None
if ret:
return 0
else:
return 1
if __name__ == "__main__":
sys.exit(main(sys.argv))
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