Mercurial > dive4elements > river

annotate backend/contrib/shpimporter/utils.py @ 7697:640342d9ab8a

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(issue1649) Remove broken getWKms from RiverUtils and use WDifferencesState instead This was basically duplicated code but only the code in WDifferenceState was maintained and extended. Another RiverUtils function bites the dust.
author Andre Heinecke <aheinecke@intevation.de>
date Mon, 16 Dec 2013 16:24:07 +0100
parents 5aa05a7a34b7
children
rev   line source
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5a654f2e35bc Added a python tool to import shapefiles into database.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 import os
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2 import sys
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3 import logging
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4
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5 try:
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6 from osgeo import ogr
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7 except ImportError:
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8 import ogr
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9
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10 logger = logging.getLogger("utils")
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11
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12 SHP='.shp'
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a6ee62a070b0 I'm learning how to use cursors \o/
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13 SQL_SELECT_RIVER_ID="SELECT id FROM rivers WHERE name = %s"
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14 SQL_SELECT_RIVER_ID_ORA="SELECT id FROM rivers WHERE name = :s"
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15
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16 def findShapefiles(path):
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17 shapes = []
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18
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19 for root, dirs, files in os.walk(path):
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20 if len(files) == 0:
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21 continue
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22
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23 logger.debug("Processing directory '%s' with %i files " % (root, len(files)))
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24
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25 for f in files:
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26 idx = f.find(SHP)
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27 if (idx+len(SHP)) == len(f):
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28 shapes.append((f.replace(SHP, ''), root + "/" + f))
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29
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30 return shapes
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31
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32 def getRiverId(dbconn, name, oracle):
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33 """
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34 Returns the id of the river "name"
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35 Dbconn must be a python database connection api compliant object
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36 """
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37 cur = dbconn.cursor()
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38 if oracle:
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39 # This is stupid and shoudl not be neccessary. But I don't
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40 # know how to make it work both ways. aheinecke - 02/2013
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41 stmt = SQL_SELECT_RIVER_ID_ORA
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42 else:
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43 stmt = SQL_SELECT_RIVER_ID
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44 cur.execute(stmt, (getUTF8(name),))
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45 row = cur.fetchone()
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46 if row:
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47 return row[0]
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48 else:
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49 return 0
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50
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51 def getUTF8(string):
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52 """
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53 Tries to convert the string to a UTF-8 encoding by first checking if it
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54 is UTF-8 and then trying cp1252
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55 """
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56 try:
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57 return unicode.encode(unicode(string, "UTF-8"), "UTF-8")
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58 except UnicodeDecodeError:
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59 # Probably European Windows names so lets try again
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60 return unicode.encode(unicode(string, "cp1252"), "UTF-8")
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61
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62 def getUTF8Path(path):
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63 """
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64 Tries to convert path to utf-8 by first checking the filesystemencoding
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65 and trying the default windows encoding afterwards.
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66 Returns a valid UTF-8 encoded unicode object or throws a UnicodeDecodeError
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67 """
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68 try:
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69 return unicode.encode(unicode(path, sys.getfilesystemencoding()), "UTF-8")
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70 except UnicodeDecodeError:
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71 # Probably European Windows names so lets try again
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72 return unicode.encode(unicode(path, "cp1252"), "UTF-8")
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73
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74 WKB_MAP = {
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75 ogr.wkb25Bit : 'wkb25Bit',
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76 ogr.wkbGeometryCollection : 'wkbGeometryCollection',
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77 ogr.wkbGeometryCollection25D :'wkbGeometryCollection25D',
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78 ogr.wkbLineString : 'wkbLineString',
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79 ogr.wkbLineString25D : 'wkbLineString25D',
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80 ogr.wkbLinearRing : 'wkbLinearRing',
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81 ogr.wkbMultiLineString : 'wkbMultiLineString',
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82 ogr.wkbMultiLineString25D : 'wkbMultiLineString25D',
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83 ogr.wkbMultiPoint : 'wkbMultiPoint',
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84 ogr.wkbMultiPoint25D : 'wkbMultiPoint25D',
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85 ogr.wkbMultiPolygon : 'wkbMultiPolygon',
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86 ogr.wkbMultiPolygon25D : 'wkbMultiPolygon25D',
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87 ogr.wkbNDR : 'wkbNDR',
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88 ogr.wkbNone : 'wkbNone',
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89 ogr.wkbPoint : 'wkbPoint',
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90 ogr.wkbPoint25D : 'wkbPoint25D',
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91 ogr.wkbPolygon : 'wkbPolygon',
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92 ogr.wkbPolygon25D : 'wkbPolygon25D',
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93 ogr.wkbUnknown : 'wkbUnknown',
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94 ogr.wkbXDR : 'wkbXDR'
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95 }
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96
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97 def getWkbString(type):
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98 return WKB_MAP.get(type) or "Unknown"
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99
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100 def convertToMultiLine(feature):
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101 """
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102 Converts a feature to a multiline feature.
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103 """
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104 geometry = feature.GetGeometryRef()
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105 # SRS information is lost while forcing to multiline
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106 srs = geometry.GetSpatialReference()
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107 geometry = ogr.ForceToMultiLineString(geometry)
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108 geometry.AssignSpatialReference(srs)
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109 feature.SetGeometry(geometry)
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110 return feature
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111
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112 def convertToMultiPolygon(feature):
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113 """
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114 Converts a feature to a multiline feature.
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115 """
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116 geometry = feature.GetGeometryRef()
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117 # SRS information is lost while forcing to multiline
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118 srs = geometry.GetSpatialReference()
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119 geometry = ogr.ForceToMultiPolygon(geometry)
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120 geometry.AssignSpatialReference(srs)
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121 feature.SetGeometry(geometry)
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122 return feature
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