question: public void readMap ( File file , MapBuilder builder ) { try { MapBuilderProxy proxy ; if ( boundingBox != null ) proxy = new BBBuilderProxy ( builder , boundingBox ) ; else if ( attFilter != null ) proxy = new FilteringBuilderProxy ( builder , attFilter ) ; else proxy = new MapBuilderProxy ( builder ) ; parseMap ( createFileStream ( file ) , proxy ) ; if ( proxy . nodeRefsWithoutDefsAdded ( ) ) { if ( boundingBox != null || attFilter != null ) { LOG . info ( "Starting to parse the map file a second time." ) ; proxy . incrementCounter ( ) ; parseMap ( createFileStream ( file ) , proxy ) ; } else { LOG . warning ( "Nodes were referenced in ways but not defined before." ) ; } } } catch ( FileNotFoundException e ) { LOG . warning ( "File does not exist " + file ) ; } catch ( Exception e ) { LOG . warning ( "The map could not be read. " + e ) ; e . printStackTrace ( ) ; } finally { boundingBox = null ; attFilter = null ; } }
target:  Reads all data from the file and send it to the sink.