Trivial Description
To my knowledge, all proper text formats accepts "\r\n" as a single line terminator upon input, regardless of the operating system a parser is run on. The difference about line terminators usually only manifests itself when it comes to writing text. Hence, LineBreaker should not try to detect a Win box but check for the char sequence "\r\n".
If you insist on OS-based behaviour, Os.isFamily( Os.FAMILY_WINDOWS ) from plexus-utils should be used and its return value should be cached in an instance variable of LineBreaker instead of querying the system property "os.name" for every single character.