question: public void addDataLine ( String [ ] values ) { assert ( headers != null && ! headers . isEmpty ( ) && headers . size ( ) == values . length ) ; if ( data == null ) { data = new ArrayList < > ( totalLines ) ; timeToDataIndex = new HashMap < > ( ) ; } Map < String , String > dataMap = new HashMap < > ( ) ; int numHeaders = headers . size ( ) ; int currentDataIndex = data . size ( ) ; for ( int index = 0 ; index < numHeaders ; index ++ ) { String header = headers . get ( index ) ; String value = values [ index ] ; if ( value . equals ( ZERO ) ) { value = ZERO ; } else if ( value . equals ( NO_DATA ) ) { value = NO_DATA ; } dataMap . put ( header , value ) ; if ( header . equals ( TIME_UTC ) ) { timeToDataIndex . put ( value , currentDataIndex ) ; } } data . add ( dataMap ) ; }
target:  Add the data values. This would represent a single line in the perpetual data file.