Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.help > #604

Using mark and reset on BufferReader, but with unknown file length

Show all headers | View raw

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,

For some reasons that come out of the scope of this discussion, I need
to read a file twice. I would prefer not to do

BufferedReader inputFile = new BufferedReader(new
FileReader(inputFilename));

twice, and, as a result, I would like to use my preceding
BufferedReader to read the file again, a second time.

That is, I first read the file, then close it, then need to re-read
it. To re-read it, I would like to use reset and mark methods, defined
over BufferedReader objects. The problem is that mark obliges me to
give a number of characters:

==
readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail. A limit value larger than the size of the input buffer will cause a new buffer to be allocated whose size is no smaller than limit. Therefore large values should be used with care. 
==
Unfortunately, I don't know how much characters there will be in my
file, and need to get to the beginning of it for reading it the second
time. Could I use reset() without mark? And, as I can't type a big
integer as readAheadLimit (because it would allocate too much memory), how can I do?

Thanks.
- -- 
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- -- 

Failure is not falling down, you fail when you don't get back up.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)
Comment: Processed by Mailcrypt 3.5.8 <http://mailcrypt.sourceforge.net/>

iEYEARECAAYFAk2ytugACgkQM0LLzLt8Mhx2iwCfSVcmSXIl/siN17+HQAdJuvqy
QwoAoK9CPuMy3SVDIiG+S2Acog4gUwOU
=ple+
-----END PGP SIGNATURE-----

Back to comp.lang.java.help | Previous | Next — Next in thread | Find similar

Thread

Using mark and reset on BufferReader, but with unknown file length Merciadri Luca <Luca.Merciadri@student.ulg.ac.be> - 2011-04-23 13:24 +0200
  Re: Using mark and reset on BufferReader, but with unknown file length Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-23 08:52 -0400
  Re: Using mark and reset on BufferReader, but with unknown file length Lothar Kimmeringer <news200709@kimmeringer.de> - 2011-04-26 09:50 +0200

csiph-web