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Encodes and decodes WKB, WKT, and GeoJSON formats.

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geo lib geo geometry.ex
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lib/geo/geometry.ex 

if Code.ensure_loaded?(Ecto.Type) do

  defmodule Geo.Geometry do



    @moduledoc """

    Implements the Ecto.Type behaviour for all geometry types

    """



    @behaviour Ecto.Type



    def type, do: :geometry



    def blank?(_), do: false



    def load(%Geo.Point{} = geom), do: {:ok, geom}

    def load(%Geo.LineString{} = geom), do: {:ok, geom}

    def load(%Geo.Polygon{} = geom), do: {:ok, geom}

    def load(%Geo.MultiPoint{} = geom), do: {:ok, geom}

    def load(%Geo.MultiLineString{} = geom), do: {:ok, geom}

    def load(%Geo.MultiPolygon{} = geom), do: {:ok, geom}

    def load(%Geo.GeometryCollection{} = geom), do: {:ok, geom}

    def load(_), do: :error



    def dump(%Geo.Point{} = geom), do: {:ok, geom}

    def dump(%Geo.LineString{} = geom), do: {:ok, geom}

    def dump(%Geo.Polygon{} = geom), do: {:ok, geom}

    def dump(%Geo.MultiPoint{} = geom), do: {:ok, geom}

    def dump(%Geo.MultiLineString{} = geom), do: {:ok, geom}

    def dump(%Geo.MultiPolygon{} = geom), do: {:ok, geom}

    def dump(%Geo.GeometryCollection{} = geom), do: {:ok, geom}

    def dump(_), do: :error



    def cast(%Geo.Point{} = geom), do: {:ok, geom}

    def cast(%Geo.LineString{} = geom), do: {:ok, geom}

    def cast(%Geo.Polygon{} = geom), do: {:ok, geom}

    def cast(%Geo.MultiPoint{} = geom), do: {:ok, geom}

    def cast(%Geo.MultiLineString{} = geom), do: {:ok, geom}

    def cast(%Geo.MultiPolygon{} = geom), do: {:ok, geom}

    def cast(%Geo.GeometryCollection{} = geom), do: {:ok, geom}

    def cast(%{"type" => _, "coordinates" => _} = geom), do: { :ok, Geo.JSON.decode(geom) }

    def cast(%{"type" => _, "geometries" => _} = geom), do: { :ok, Geo.JSON.decode(geom) }



    if Code.ensure_loaded?(Poison) do

      def cast(geom) when is_binary(geom), do: { :ok, Poison.decode!(geom) |> Geo.JSON.decode }

    end



    def cast(_), do: :error

  end

end