/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
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; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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
*/
/*
* Created on May 26, 2011
*/
package com.bigdata.io;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Input stream which reports the #of bytes read from the underlying stream.
* <p>
* Note: All <em>read</em> methods MUST be overridden if you subclass this
* filter as it overrides them all for better performance.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*
* TODO test suite.
*/
public class ByteCountInputStream extends FilterInputStream {
private final InputStream in;
private int nread = 0;
/**
* The #of bytes read from the underlying stream.
*/
public int getNRead() {
return nread;
}
/**
* @param in
*/
public ByteCountInputStream(final InputStream in) {
super(in);
this.in = in;
}
public int read() throws IOException {
final int b = super.read();
if (b != -1)
nread++;
return b;
}
public int read(final byte[] a) throws IOException {
final int n = in.read(a); // efficiency!
if (n != -1)
nread += n;
return n;
}
public int read(final byte[] a, final int off, final int len)
throws IOException {
final int n = in.read(a, off, len); // efficiency!
if (n != -1)
nread += n;
return n;
}
}