Debug InputStream : Debug « Development Class « Java

Debug InputStream

Copyright (C) 2004  Juho Vh-Herttua

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  
02111-1307, USA.


public class DebugInputStream extends InputStream {
  InputStream is;
  ByteArrayOutputStream buffer;
  boolean debug;

  public DebugInputStream(InputStream in, boolean usedebug) {
    is = in;
    buffer = new ByteArrayOutputStream();
    debug = usedebug;

  public int read() throws IOException {
    int input;

    input =;
    if (debug) buffer.write(input);

    return input;

  public int read(byte b[], int off, int len) throws IOException {
    int readb;

    readb =, off, len);
    if (debug) buffer.write(b, off, readb);
    return readb;

  public int available() throws IOException {
    return is.available();

  public void close() throws IOException {

  public void mark(int readlimit) {

  public void reset() throws IOException {

  public boolean markSupported() {
    return is.markSupported();

  public byte[] toByteArray() {
    return buffer.toByteArray();

  public int size() {
    return buffer.size();


Related examples in the same category

1.A simple logging facility.
2.Debug Utilities
3.Methods for printing Debug messages
4.Trace InputStream
5.Trace OutputStream
6.Debug Utility
7.Debugging utility that reports, in a brute force manner, any internal data of a class instance
8.Swing Console
9.How to do Benchmark
10.Methods for logging events
11.Printing indented text
12.Prints messages formatted for a specific line width.
13.Class providing static methods to log diagnostics
14.A bean that can be used to keep track of a counter
15.An integer synchronized counter class.
16.Counts down from a specified value the number of bytes actually read from the wrapped InputStream.
17.A long integer counter class
18.Logging class to record errors or unexpected behavior to a file
19.Handle obtaining string timestamps
20.Scans java source files in cvs tree and validates the license header
21.Debug Util
22.Array debug util
23.A simple frame that allows quick and easy visualisation of something