Class: ActiveRecord::ConnectionAdapters::SpatialOracleColumn

Inherits:
Column
  • Object
show all
Includes:
SpatialColumn
Defined in:
lib/spatial_adapter/oracle_enhanced.rb

Class Method Summary collapse

Class Method Details

.geomcollection_from_sdo_geometry(elem_info, ordinates, ndim) ⇒ Object 



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# File 'lib/spatial_adapter/oracle_enhanced.rb', line 493

def self.geomcollection_from_sdo_geometry(elem_info, ordinates, ndim)
  num_elems = elem_info.size / 3
  geometries = []
  0.upto(num_elems-1) do |idx|
    (start_ord, etype, interpretation, end_ord) = elem_info.slice(idx*3,4)
    end_ord ||= ordinates.size + 1
    num_ords = end_ord - start_ord
    geom = nil
    case etype
    when 1
      if ndim == 2
        geom = Point.from_x_y(ordinates[start_ord-1].to_f, ordinates[start_ord].to_f)
      elsif ndim == 3
        geom = Point.from_x_y_z(ordinates[start_ord-1].to_f, ordinates[start_ord].to_f, ordinates[start_ord+1].to_f)
      else
        raise "Not supporting #{ndim} dimensional points"
      end
    when 2
      geom = LineString.from_coordinates(group_ordinates(ordinates.slice(start_ord-1, num_ords), ndim))
    when 1003
      raise "Unsupported interpretation #{interpretation} for etype 1003" if interpretation != 1
      ring = LinearRing.from_coordinates(group_ordinates(ordinates.slice(start_ord-1, num_ords), ndim))
      geom = Polygon.from_linear_rings([ring])
    when 2003
      raise "Unsupported interpretation #{interpretation} for etype 2003" if interpretation != 1
      ring = LinearRing.from_coordinates(group_ordinates(ordinates.slice(start_ord-1, num_ords), ndim))
      last_geom = geometries.pop
      geom = Polygon.from_linear_rings(last_geom.rings + [ring])
    else
      raise "Unsupported type in collection: etype = #{etype}, interpretation = #{interpretation}"
    end
    geometries << geom if geom
  end
  GeometryCollection.from_geometries(geometries)
end

.group_ordinates(ordinates, num_dims) ⇒ Object 



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# File 'lib/spatial_adapter/oracle_enhanced.rb', line 427

def self.group_ordinates(ordinates, num_dims)
  coords = []
  ordinates.each_slice(num_dims) do |coord|
    x,y = coord
    coords << [x.to_f, y.to_f]
  end
  coords
end

.linestrings_from_sdo_geometry(elem_info, ordinates, ndim) ⇒ Object 



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# File 'lib/spatial_adapter/oracle_enhanced.rb', line 459

def self.linestrings_from_sdo_geometry(elem_info, ordinates, ndim)
  num_ls = elem_info.size / 3
  linestrings = []
  0.upto(num_ls-1) do |ring_idx|
    (start_ord, ring_type, gtype, end_ord) = elem_info.slice(ring_idx*3,4)
    end_ord ||= ordinates.size + 1
    num_ords = end_ord - start_ord
    linestrings << LineString.from_coordinates(group_ordinates(ordinates.slice(start_ord-1, num_ords), ndim))
  end
  linestrings
end

.point_from_sdo_geometry(elem_info, ordinates, ndim, sdo_point) ⇒ Object 



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# File 'lib/spatial_adapter/oracle_enhanced.rb', line 446

def self.point_from_sdo_geometry(elem_info, ordinates, ndim, sdo_point)
  if sdo_point
    point_from_sdo_point(sdo_point, ndim)
  else
    coords = ordinates.slice(0,ndim)
    if ndim == 2
      Point.from_x_y(ordinates[0].to_f, ordinates[1].to_f)
    elsif ndim == 3
      Point.from_x_y_z(ordinates[0].to_f, ordinates[1].to_f, ordinates[2].to_f)
    end
  end
end

.point_from_sdo_point(sdo_point, ndim) ⇒ Object 



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# File 'lib/spatial_adapter/oracle_enhanced.rb', line 436

def self.point_from_sdo_point(sdo_point, ndim)
  if ndim == 2
    Point.from_x_y(sdo_point.x.to_f, sdo_point.y.to_f)
  elsif ndim == 3
    Point.from_x_y_z(sdo_point.x.to_f, sdo_point.y.to_f, sdo_point.z.to_f)
  else
    raise "Not supporting #{ndim} dimensional points"
  end
end

.polygons_from_sdo_geometry(elem_info, ordinates, ndim) ⇒ Object 



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# File 'lib/spatial_adapter/oracle_enhanced.rb', line 471

def self.polygons_from_sdo_geometry(elem_info, ordinates, ndim)
  num_rings = elem_info.size / 3
  polygons = []
  rings = []
  cur_polygon = nil
  0.upto(num_rings-1) do |ring_idx|
    (start_ord, etype, interpretation, end_ord) = elem_info.slice(ring_idx*3,4)
    end_ord ||= ordinates.size + 1
    num_ords = end_ord - start_ord
    if etype == 1003 && rings.size > 0 # exterior ring
      polygons << Polygon.from_linear_rings(rings)
      rings = []
    end
    rings << LinearRing.from_coordinates(group_ordinates(ordinates.slice(start_ord-1, num_ords), ndim))
  end
  if rings.size > 0 # exterior ring
    polygons << Polygon.from_linear_rings(rings)
    rings = []
  end
  polygons
end

.string_to_geometry(obj) ⇒ Object

With the ruby-oci8 adapter, we get objects back from spatial columns so this method name is a bit of a misnomer. TODO: change this method name to ‘to_geometry’



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# File 'lib/spatial_adapter/oracle_enhanced.rb', line 396

def self.string_to_geometry(obj)
  return obj unless obj && obj.class.to_s == "OCI8::Object::Mdsys::SdoGeometry"
  raise "Bad #{obj.class} object: #{obj.inspect}" if obj.sdo_gtype.nil? 
  ndim = obj.sdo_gtype.to_int/1000
  gtype = obj.sdo_gtype.to_int%1000
  eleminfo = obj.sdo_elem_info.instance_variable_get('@attributes')
  ordinates = obj.sdo_ordinates.instance_variable_get('@attributes')
  case gtype
  when 1
    geom = point_from_sdo_geometry(eleminfo, ordinates, ndim, obj.sdo_point)
  when 2
    geom = linestrings_from_sdo_geometry(eleminfo, ordinates, ndim)[0]
  when 3
    geom = polygons_from_sdo_geometry(eleminfo, ordinates, ndim)[0]
  when 4
    geom = geomcollection_from_sdo_geometry(eleminfo, ordinates, ndim)
  when 5
    geom = MultiPoint.from_coordinates(group_ordinates(ordinates, ndim))
  when 6
    linestrings = linestrings_from_sdo_geometry(eleminfo, ordinates, ndim)
    geom = MultiLineString.from_line_strings(linestrings)
  when 7
    polygons = polygons_from_sdo_geometry(eleminfo, ordinates, ndim)
    geom = MultiPolygon.from_polygons(polygons)
  else
    raise "Unhandled geometry type #{obj.sdo_gtype.to_int}"
  end
  geom.srid = obj.sdo_srid.to_i
  geom
end