Summary

Modify LineNumberReader to consider end-of-stream to be a line terminator.

Problem

LineNumberReader presently does not consider end-of-stream to be a line terminator, i.e, one of \r, \n, or \r\n. Thus for example for a stream such as

line 1\n
line 2\n
line 3

which ends without a line terminator, only two lines would be reported.

Solution

Modify LineNumberReader to consider end-of-stream to be a line terminator.

Specification

Modify the specification of LineNumberReader as follows.

Class specification

By default, line numbering begins at 0. This number increments at every line terminator as the data is read, and at the end of the stream if the last character in the stream is not a line terminator. This number can be changed with a call to setLineNumber(int). Note however, that setLineNumber(int) does not actually change the current position in the stream; it only changes the value that will be returned by getLineNumber().

A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed, or any of the previous terminators followed by end of stream, or end of stream not preceded by another terminator.

read() specification

Read a single character. Line terminators are compressed into single newline ('\n') characters. The current line number is incremented whenever a line terminator is read, or when the end of the stream is reached and the last character in the stream is not a line terminator.

read(char[],int,int) specification

Read characters into a portion of an array. Line terminators are compressed into single newline ('\n') characters. The current line number is incremented whenever a line terminator is read, or when the end of the stream is reached and the last character in the stream is not a line terminator.

readLine() specification

Read a line of text. Line terminators are compressed into single newline ('\n') characters. The current line number is incremented whenever a line terminator is read, or when the end of the stream is reached and the last character in the stream is not a line terminator.