/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: lobochief@users.sourceforge.net
*/
/*
* Created on Apr 15, 2005
*/
package org.lobobrowser.util;
import java.io.IOException;
import java.io.InputStream;
/**
* @author J. H. S.
*/
public class MonitoredInputStream extends InputStream {
private final InputStream delegate;
private int progress = 0;
private final long minProgressEventGap;
public final EventDispatch evtProgress = new EventDispatch();
public MonitoredInputStream(final InputStream delegate, final int minProgressEventGap) {
this.delegate = delegate;
this.minProgressEventGap = minProgressEventGap;
}
public MonitoredInputStream(final InputStream delegate) {
this(delegate, 200);
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#available()
*/
@Override
public int available() throws IOException {
return this.delegate.available();
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#close()
*/
@Override
public void close() throws IOException {
this.delegate.close();
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#markSupported()
*/
@Override
public boolean markSupported() {
return false;
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#read()
*/
@Override
public int read() throws IOException {
final int b = this.delegate.read();
if (b != -1) {
this.progress++;
}
return b;
}
private long lastEvenPosted = 0;
/*
* (non-Javadoc)
*
* @see java.io.InputStream#read(byte[], int, int)
*/
@Override
public int read(final byte[] arg0, final int arg1, final int arg2) throws IOException {
final int numRead = this.delegate.read(arg0, arg1, arg2);
if (numRead != -1) {
this.progress += numRead;
final long currentTime = System.currentTimeMillis();
if ((currentTime - this.lastEvenPosted) > this.minProgressEventGap) {
this.evtProgress.fireEvent(new InputProgressEvent(this, this.progress));
this.lastEvenPosted = currentTime;
}
}
return numRead;
}
}