76 lines
2.3 KiB
Ruby
76 lines
2.3 KiB
Ruby
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require_relative '../../lib/carto/table_utils'
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require_dependency 'carto/bounding_box_utils'
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class Carto::BoundingBoxService
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include Carto::TableUtils
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def initialize(user, table_name)
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@user = user
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@table_name = table_name
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end
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def table_bounds
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# (lon,lat) as comes out from postgis
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result = current_bbox_using_stats
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return nil unless result
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{
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maxx: Carto::BoundingBoxUtils.bound_for(result[:max][0].to_f, :minx, :maxx),
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maxy: Carto::BoundingBoxUtils.bound_for(result[:max][1].to_f, :miny, :maxy),
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minx: Carto::BoundingBoxUtils.bound_for(result[:min][0].to_f, :minx, :maxx),
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miny: Carto::BoundingBoxUtils.bound_for(result[:min][1].to_f, :miny, :maxy)
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}
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end
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private
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# Postgis stats-based calculation of bounds. Much faster but not always present, so needs a fallback
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def current_bbox_using_stats
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# Less ugly (for tests at least) than letting an exception generate not having any table name
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return nil unless @table_name.present?
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# (lon,lat) as comes from postgis
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JSON.parse(@user.db_service.execute_in_user_database(%{
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SELECT _postgis_stats ('#{@table_name}', 'the_geom');
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}).first['_postgis_stats'])['extent'].symbolize_keys
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rescue PG::Error => e
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if e.message =~ /stats for (.*) do not exist/i
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begin
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current_bbox
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rescue
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nil
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end
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end
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end
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def current_bbox
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# (lon, lat) as comes from postgis (ST_X = Longitude, ST_Y = Latitude)
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# map has no geometries
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result = get_bbox_values
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if result.all? { |_, value| value.nil? }
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nil
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else
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# still (lon,lat) to be consistent with current_bbox_using_stats()
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{
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max: [result['maxx'].to_f, result['maxy'].to_f],
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min: [result['minx'].to_f, result['miny'].to_f]
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}
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end
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rescue PG::Error => exception
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CartoDB::Logger.error(exception: exception, table: @table_name)
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raise BoundingBoxError.new("Can't calculate the bounding box for table #{@table_name}. ERROR: #{exception}")
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end
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def get_bbox_values
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result = @user.db_service.execute_in_user_database(%{
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SELECT
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ST_XMin(ST_Extent(the_geom)) AS minx,
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ST_YMin(ST_Extent(the_geom)) AS miny,
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ST_XMax(ST_Extent(the_geom)) AS maxx,
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ST_YMax(ST_Extent(the_geom)) AS maxy
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FROM #{safe_table_name_quoting(@table_name)} AS subq
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}).first
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result
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end
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end
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