ogr_python.i

支持各种栅格图像和矢量图像读取的库

/*
 * $Id: ogr_python.i 10425 2006-12-01 05:24:54Z fwarmerdam $
 *
 * python specific code for ogr bindings.
 */

/*
 * $Log$
 * Revision 1.5  2006/12/01 05:24:54  fwarmerdam
 * reimplement Destroy, Release, Reference and Dereference
 *
 * Revision 1.4  2006/11/30 21:45:32  fwarmerdam
 * Improve __getattr__ and GetField() methods on feature.
 *
 * Revision 1.3  2005/10/16 20:39:56  hobu
 * fix a typo
 *
 * Revision 1.2  2005/09/06 01:51:42  kruland
 * Removed GetDriverByName, GetDriver, Open, OpenShared because they are defined
 * in ogr now.
 * Removed %feature("compactdefaultargs") because it's defined in ogr.i now.
 *
 * Revision 1.1  2005/09/02 16:19:23  kruland
 * Major reorganization to accomodate multiple language bindings.
 * Each language binding can define renames and supplemental code without
 * having to have a lot of conditionals in the main interface definition files.
 *
 */

%feature("autodoc");

%init %{

  if ( OGRGetDriverCount() == 0 ) {
    OGRRegisterAll();
  }
  
%}

%rename (GetDriverCount) OGRGetDriverCount;
%rename (GetOpenDSCount) OGRGetOpenDSCount;
%rename (SetGenerate_DB2_V72_BYTE_ORDER) OGRSetGenerate_DB2_V72_BYTE_ORDER;
%rename (RegisterAll) OGRRegisterAll();

%extend OGRDataSourceShadow {
  %pythoncode {
    def Destroy(self):
      "Once called, self has effectively been destroyed.  Do not access. For backwards compatiblity only"
      _ogr.delete_DataSource( self )
      self.thisown = 0

    def Release(self):
      "Once called, self has effectively been destroyed.  Do not access. For backwards compatiblity only"
      _ogr.delete_DataSource( self )
      self.thisown = 0

    def Reference(self):
      "For backwards compatibility only."
      return self.Reference()
  
    def Dereference(self):
      "For backwards compatibility only."
      self.Dereference()

    def __len__(self):
        """Returns the number of layers on the datasource"""
        return self.GetLayerCount()

    def __getitem__(self, value):
        """Support dictionary, list, and slice -like access to the datasource.
ds[0] would return the first layer on the datasource.
ds['aname'] would return the layer named "aname".
ds[0:4] would return a list of the first four layers."""
        import types
        if isinstance(value, types.SliceType):
            output = []
            for i in xrange(value.start,value.stop,step=value.step):
                try:
                    output.append(self.GetLayer(i))
                except OGRError: #we're done because we're off the end
                    return output
            return output
        if isinstance(value, types.IntType):
            if value > len(self)-1:
                raise IndexError
            return self.GetLayer(value)
        elif isinstance(value,types.StringType):
            return self.GetLayer(value)
        else:
            raise TypeError, 'Input %s is not of String or Int type' % type(value)

    def GetLayer(self,iLayer=0):
        """Return the layer given an index or a name"""
        import types
        if isinstance(iLayer, types.StringType):
            return self.GetLayerByName(iLayer)
        elif isinstance(iLayer, types.IntType):
            return self.GetLayerByIndex(iLayer)
        else:
            raise TypeError, "Input %s is not of String or Int type" % type(iLayer)
}
}

%extend OGRLayerShadow {
  %pythoncode {
    def Reference(self):
      "For backwards compatibility only."
      pass
  
    def Dereference(self):
      "For backwards compatibility only."
      pass

    def __len__(self):
        """Returns the number of features in the layer"""
        return self.GetFeatureCount()

    def __getitem__(self, value):
        """Support list and slice -like access to the layer.
layer[0] would return the first feature on the layer.
layer[0:4] would return a list of the first four features."""
        if isinstance(value, types.SliceType):
            output = []
            if value.stop == sys.maxint:
                #for an unending slice, sys.maxint is used
                #We need to stop before that or GDAL will write an
                ##error to stdout
                stop = len(self) - 1
            else:
                stop = value.stop
            for i in xrange(value.start,stop,step=value.step):
                feature = self.GetFeature(i)
                if feature:
                    output.append(feature)
                else:
                    return output
            return output
        if isinstance(value, types.IntType):
            if value > len(self)-1:
                raise IndexError
            return self.GetFeature(value)
        else:
            raise TypeError,"Input %s is not of IntType or SliceType" % type(value)

    def CreateFields(fields):
        """Create a list of fields on the Layer"""
        for i in fields:
            self.CreateField(i)

    def __iter__(self):
        return self

    def next(self):
        feature = self.GetNextFeature()
        if not feature:
            raise StopIteration
        else:
            return feature
  }

}

%extend OGRFeatureShadow {
  %pythoncode {
    def Reference(self):
      pass

    def Dereference(self):
      pass

    def Destroy(self):
      "Once called, self has effectively been destroyed.  Do not access. For backwards compatiblity only"
      _ogr.delete_Feature( self )
      self.thisown = 0

    def __cmp__(self, other):
        """Compares a feature to another for equality"""
        return self.Equal(other)

    def __copy__(self):
        return self.Clone()

    def __getattr__(self, name):
        """Returns the values of fields by the given name"""
        try:
            return self.GetField(name)
        except:
            raise AttributeError, name

    def GetField(self, fld_index):
        import types
        if isinstance(fld_index, types.StringType):
            fld_index = self.GetFieldIndex(fld_index)
        if (fld_index < 0) or (fld_index > self.GetFieldCount()):
            raise ValueError, "Illegal field requested in GetField()"
        if not (self.IsFieldSet(fld_index)):
            return None
        fld_type = self.GetFieldType(fld_index)
        if fld_type == OFTInteger:
            return self.GetFieldAsInteger(fld_index)
        if fld_type == OFTReal:
            return self.GetFieldAsDouble(fld_index)
        # default to returning as a string.  Should we add more types?
        return self.GetFieldAsString(fld_index)
        
}

}

%extend OGRGeometryShadow {
%pythoncode {
  def Destroy(self):
    self.__del__()
    self.thisown = 0

  def __str__(self):
    return self.ExportToWkt()
}
}

%extend OGRFieldDefnShadow {
%pythoncode {
    width = property(GetWidth, SetWidth)
    type = property(GetType, SetType)
    precision = property(GetPrecision, SetPrecision)
    name = property(GetName, SetName)
    justify = property(GetJustify, SetJustify)
}
}

%extend OGRFeatureDefnShadow {
%pythoncode {
  def Destroy(self):
    "Once called, self has effectively been destroyed.  Do not access. For backwards compatiblity only"
    self.__del__()
    self.thisown = 0
}
}

%extend OGRFieldDefnShadow {
%pythoncode {
  def Destroy(self):
    "Once called, self has effectively been destroyed.  Do not access. For backwards compatiblity only"
    self.__del__()
    self.thisown = 0
}
}

%import typemaps_python.i