Module: Adiwg_GeographicElement

Defined in:
lib/adiwg/mdtranslator/readers/adiwgJson/modules_0.9.0/module_geographicElement.rb

Class Method Summary collapse

Class Method Details

.unpack(aGeoElements) ⇒ Object 



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# File 'lib/adiwg/mdtranslator/readers/adiwgJson/modules_0.9.0/module_geographicElement.rb', line 27

def self.unpack(aGeoElements)

  # only one geometry is allowed per geographic element.
  # ... in GeoJSON each geometry is allowed a bounding box;
  # ... This code splits bounding boxes to separate elements

  # instance classes needed in script
  aIntGeoEle = Array.new

  aGeoElements.each do |hGeoJsonElement|

    # instance classes needed in script
    intMetadataClass = InternalMetadata.new
    hGeoElement = intMetadataClass.newGeoElement

    # find geographic element type
    if hGeoJsonElement.has_key?('type')
      elementType = hGeoJsonElement['type']
    else
      # invalid geographic element
      return nil
    end

    # set geographic element id
    if hGeoJsonElement.has_key?('id')
      s = hGeoJsonElement['id']
      if s != ''
        hGeoElement[:elementId] = s
      end
    end

    # set geographic element coordinate reference system - CRS
    if hGeoJsonElement.has_key?('crs')
      hGeoCrs = hGeoJsonElement['crs']
      Adiwg_GeoCoordSystem.unpack(hGeoCrs, hGeoElement)
    end

    # set geographic element properties
    if hGeoJsonElement.has_key?('properties')
      hGeoProps = hGeoJsonElement['properties']
      Adiwg_GeoProperties.unpack(hGeoProps, hGeoElement)
    end

    # process geographic element bounding box
    # the bounding box must be represented as a separate geographic element for ISO
    # need to make a deep copy of current state of geographic element for bounding box
    if hGeoJsonElement.has_key?('bbox')
      if hGeoJsonElement['bbox'].length == 4
        aBBox = hGeoJsonElement['bbox']

        boxElement = Marshal.load(Marshal.dump(hGeoElement))
        boxElement[:elementGeometry] = Adiwg_BoundingBox.unpack(aBBox)

        aIntGeoEle << boxElement
      end
    end

    # unpack geographic element
    case elementType

      # GeoJSON Features
      when 'Feature'
        if hGeoJsonElement.has_key?('geometry')
          hGeometry = hGeoJsonElement['geometry']

          # geoJSON requires geometry to be 'null' when geometry is bounding box only
          # JSON null converts in parsing to ruby nil
          unless hGeometry.nil?
            unless hGeometry.empty?
              if hGeometry.has_key?('type')
                geometryType = hGeometry['type']
                aCoordinates = hGeometry['coordinates']
                unless aCoordinates.empty?
                  case geometryType
                    when 'Point', 'MultiPoint'
                      hGeoElement[:elementGeometry] = Adiwg_Point.unpack(aCoordinates, geometryType)
                    when 'LineString', 'MultiLineString'
                      hGeoElement[:elementGeometry] = Adiwg_LineString.unpack(aCoordinates, geometryType)
                    when 'Polygon', 'MultiPolygon'
                      hGeoElement[:elementGeometry] = Adiwg_Polygon.unpack(aCoordinates, geometryType)
                    else
                      # log - the GeoJSON geometry type is not supported
                  end
                  aIntGeoEle << hGeoElement
                end
              end
            end
          end

        end

      # GeoJSON Feature Collection
      when 'FeatureCollection'
        if hGeoJsonElement.has_key?('features')
          aFeatures = hGeoJsonElement['features']
          unless aFeatures.empty?
            intGeometry = intMetadataClass.newGeometry
            intGeometry[:geoType] = 'MultiGeometry'
            intGeometry[:geometry] = Adiwg_GeographicElement.unpack(aFeatures)
            hGeoElement[:elementGeometry] = intGeometry
            aIntGeoEle << hGeoElement
          end
        end

      # GeoJSON Geometries
      when 'Point', 'MultiPoint'
        aCoordinates = hGeoJsonElement['coordinates']
        hGeoElement[:elementGeometry] = Adiwg_Point.unpack(aCoordinates, elementType)
        aIntGeoEle << hGeoElement

      when 'LineString', 'MultiLineString'
        aCoordinates = hGeoJsonElement['coordinates']
        hGeoElement[:elementGeometry] = Adiwg_LineString.unpack(aCoordinates, elementType)
        aIntGeoEle << hGeoElement

      when 'Polygon', 'MultiPolygon'
        aCoordinates = hGeoJsonElement['coordinates']
        hGeoElement[:elementGeometry] = Adiwg_Polygon.unpack(aCoordinates, elementType)
        aIntGeoEle << hGeoElement

      # GeoJSON Geometry Collection
      when 'GeometryCollection'
        if hGeoJsonElement.has_key?('geometries')
          aGeometries = hGeoJsonElement['geometries']
          unless aGeometries.empty?
            intGeometry = intMetadataClass.newGeometry
            intGeometry[:geoType] = 'MultiGeometry'
            intGeometry[:geometry] = Adiwg_GeographicElement.unpack(aGeometries)
            hGeoElement[:elementGeometry] = intGeometry
            aIntGeoEle << hGeoElement
          end
        end

    end

  end

  return aIntGeoEle

end