question: public static LocationInfo parse ( String fullInfo ) { if ( fullInfo == null ) { return null ; } fullInfo = removeLambdas ( fullInfo ) ; fullInfo = fullInfo . trim ( ) ; fullInfo = StringUtils . removeStart ( fullInfo , "at " ) ; int lastClosingBrace = fullInfo . indexOf ( ')' ) ; int lastColon = fullInfo . lastIndexOf ( ':' , lastClosingBrace ) ; int lastOpeningBrace = fullInfo . lastIndexOf ( '(' , lastColon ) ; if ( lastOpeningBrace == - 1 || lastClosingBrace == - 1 || lastColon == - 1 ) { return null ; } String packageName ; String className ; String methodName ; String fileName ; Optional < Integer > lineNumber ; final String lineNumberString = fullInfo . substring ( lastColon + 1 , lastClosingBrace ) ; lineNumber = Optional . of ( Integer . parseInt ( lineNumberString ) ) ; fileName = fullInfo . substring ( lastOpeningBrace + 1 , lastColon ) ; fullInfo = fullInfo . substring ( 0 , lastOpeningBrace ) ; int lastDot = fullInfo . lastIndexOf ( '.' ) ; if ( lastDot == - 1 ) { return null ; } else { methodName = fullInfo . substring ( lastDot + 1 ) ; className = fullInfo . substring ( 0 , lastDot ) ; lastDot = className . lastIndexOf ( "." ) ; if ( lastDot == - 1 ) { packageName = "" ; } else { packageName = className . substring ( 0 , lastDot ) ; } } return new LocationInfo ( Optional . of ( packageName ) , Optional . of ( className ) , Optional . of ( methodName ) , Optional . of ( fileName ) , lineNumber , Optional . empty ( ) ) ; }
target:  build a LocationInfo instance from one line of a stackTrace