Mercurial > dive4elements > river

annotate flys-backend/contrib/shpimporter/importer.py @ 4967:2954eed04288

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Calculation4: Doc and TODO/issue.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 06 Feb 2013 09:56:46 +0100
parents 8e99d2d9364d
children c0a58558b817
rev   line source
4872
a563e9f58f93 Improve error handling and unify dbconn for all importers
Andre Heinecke <aheinecke@intevation.de>
parents: 4871
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1 try:
a563e9f58f93 Improve error handling and unify dbconn for all importers
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2 from osgeo import ogr
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3 except ImportErrror:
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4 import ogr
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5 import osr
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6 import shpimporter
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7 import utils
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8
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9 class Importer:
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10
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11 def __init__(self, config, dbconn):
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12 self.config = config
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13 self.dbconn = dbconn
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14 self.river_id = config.river_id
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15 self.dest_srs = osr.SpatialReference()
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16 self.dest_srs.ImportFromEPSG(config.target_srs)
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17 self.handled_fields = []
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18 self.tracking_import = False
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19
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20 def getKind(self, path):
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21 raise NotImplementedError("Importer.getKind is abstract!")
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22
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23 def getPath(self, base):
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24 raise NotImplementedError("Importer.getPath is abstract!")
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25
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26 def getTablename(self):
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27 raise NotImplementedError("Importer.getTablename is abstract!")
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28
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29 def getName(self):
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30 raise NotImplementedError("Importer.getTablename is abstract!")
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31
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32 def IsFieldSet(self, feat, name):
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33 if feat.GetFieldIndex(name) == -1:
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34 return False # Avoids an Error in IsFieldSet
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35 return feat.IsFieldSet(feat.GetFieldIndex(name))
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36
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37 def IsDoubleFieldSet(self, feat, name):
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38 try:
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39 isset = feat.GetFieldAsDouble(name)
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40 return isset is not None
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41 except:
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42 return False
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43
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44 def isShapeRelevant(self, name, path):
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45 return True
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46
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47 def walkOverShapes(self, shape):
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48 (name, path) = shape
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49 if not self.isShapeRelevant(name, path):
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8654e4480fc6 Shape importer: added command line option dry_run to supress database transactions.
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parents: 3654
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50 shpimporter.INFO("Skip shapefile '%s'" % path)
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51 return
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52
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53 shp = ogr.Open(shape[1])
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54 if shp is None:
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55 shpimporter.ERROR("Shapefile '%s' could not be opened!" % path)
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56 return
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57
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58 shpimporter.INFO("Processing shapefile '%s'" % path)
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59 srcLayer = shp.GetLayerByName(name)
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60
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61 if srcLayer is None:
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62 shpimporter.ERROR("Layer '%s' was not found!" % name)
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63 return
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64
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65 return self.shape2Database(srcLayer, name, path)
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66
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67 def transform(self, feat):
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68 geometry = feat.GetGeometryRef()
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69 src_srs = geometry.GetSpatialReference()
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70
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71 if src_srs is None:
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72 shpimporter.ERROR("No source SRS given! No transformation possible!")
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73 return feat
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74
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75 transformer = osr.CoordinateTransformation(src_srs, self.dest_srs)
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76 geometry.Transform(transformer)
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77
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78 return feat
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79
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80 def handled(self, field):
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81 """
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82 Register a field or a map of as handled during the import.
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83
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84 There is a warning printed after the import for each unhandled field!
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85 """
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86 if not field in self.handled_fields:
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87 self.handled_fields.append(field)
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88
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89 def copyFields(self, src, target, mapping):
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90 """
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91 Checks the mapping dictonary for key value pairs to
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92 copy from the source to the destination feature.
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93
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94 The Key is the attribute of the source feature to be copied
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95 into the target attribute named by the dict's value.
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96 """
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97 self.tracking_import = True
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98 self.handled_fields.extend(mapping.keys())
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99 for key, value in mapping.items():
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100 if src.GetFieldIndex(key) == -1:
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101 continue
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102 # 0 OFTInteger, Simple 32bit integer
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103 # 1 OFTIntegerList, List of 32bit integers
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104 # 2 OFTReal, Double Precision floating point
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105 # 3 OFTRealList, List of doubles
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106 # 4 OFTString, String of ASCII chars
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107 # 5 OFTStringList, Array of strings
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108 # 6 OFTWideString, deprecated
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109 # 7 OFTWideStringList, deprecated
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110 # 8 OFTBinary, Raw Binary data
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111 # 9 OFTDate, Date
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112 # 10 OFTTime, Time
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113 # 11 OFTDateTime, Date and Time
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114 if src.IsFieldSet(src.GetFieldIndex(key)):
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115 if src.GetFieldType(key) == 2:
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116 target.SetField(value, src.GetFieldAsDouble(key))
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117 else:
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118 target.SetField(value, src.GetField(key))
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119
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120 def shape2Database(self, srcLayer, name, path):
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121 destLayer = self.dbconn.GetLayerByName(self.getTablename())
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122
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123 if srcLayer is None:
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124 shpimporter.ERROR("Shapefile is None!")
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125 return -1
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126
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127 if destLayer is None:
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128 shpimporter.ERROR("No destination layer given!")
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129 return -1
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130
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131 count = srcLayer.GetFeatureCount()
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132 shpimporter.DEBUG("Try to add %i features to database." % count)
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133
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134 srcLayer.ResetReading()
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135
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136 geomType = -1
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137 success = 0
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138 unsupported = 0
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139 creationFailed = 0
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140 featureDef = destLayer.GetLayerDefn()
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141
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142 for feat in srcLayer:
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143 geom = feat.GetGeometryRef()
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144
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145 if geom is None:
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146 shpimporter.DEBUG("Unkown Geometry reference for feature")
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147 continue
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148
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149 geomType = geom.GetGeometryType()
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150
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151 if self.isGeometryValid(geomType):
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152 newFeat = self.createNewFeature(featureDef,
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153 feat,
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154 name=name,
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155 path=path)
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156
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157 if newFeat is not None:
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158 newFeat.SetField("path", utils.getUTF8Path(path))
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159 newFeat = self.transform(newFeat)
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160 res = destLayer.CreateFeature(newFeat)
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161 if res is None or res > 0:
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162 shpimporter.ERROR("Unable to insert feature. Error: %r" % res)
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163 else:
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164 success = success + 1
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165 else:
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166 creationFailed = creationFailed + 1
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167 else:
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168 unsupported = unsupported + 1
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169
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170 shpimporter.INFO("Inserted %i features" % success)
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171 shpimporter.INFO("Failed to create %i features" % creationFailed)
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172 shpimporter.INFO("Found %i unsupported features" % unsupported)
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173
4886
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174 if self.tracking_import:
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175 unhandled = []
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176 for i in range(0, srcLayer.GetLayerDefn().GetFieldCount()):
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177 act_field = srcLayer.GetLayerDefn().GetFieldDefn(i).GetNameRef()
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178 if not act_field in self.handled_fields:
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179 unhandled.append(act_field)
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180
4886
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181 if len(unhandled):
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182 shpimporter.INFO("Did not import values from fields: %s " % \
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183 " ".join(unhandled))
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diff changeset
184
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185 try:
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186 if self.config.dry_run > 0:
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187 return geomType
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parents:
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188 destLayer.CommitTransaction()
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189 except e:
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parents: 3654
diff changeset
190 shpimporter.ERROR("Exception while committing transaction.")
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parents:
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191
bd9e76e0b55d Improved the python shapefile importer.
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192 return geomType
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