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/*******************************************************************************
* Copyright (c) 2000, 2004 QNX Software Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* QNX Software Systems - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.make.internal.core;
import java.io.IOException;
import java.io.OutputStream;
import org.eclipse.core.runtime.IProgressMonitor;
public class StreamMonitor extends OutputStream {
IProgressMonitor monitor;
OutputStream console;
public final int fTotalWork;
private int halfWay;
private int currentIncrement = 2;
private int nextProgress = currentIncrement;
private int worked = 0;
public StreamMonitor(IProgressMonitor mon, OutputStream cos, int totalWork) {
monitor = mon;
console = cos;
fTotalWork = totalWork;
halfWay = fTotalWork / 2;
monitor.beginTask("", fTotalWork); //$NON-NLS-1$
}
private void progressUpdate() {
if (--nextProgress <= 0) {
//we have exhausted the current increment, so report progress
if (fTotalWork > worked) {
monitor.worked(1);
}
worked++;
if (worked >= halfWay) {
//we have passed the current halfway point, so double the
//increment and reset the halfway point.
currentIncrement *= 2;
halfWay += (fTotalWork - halfWay) / 2;
}
//reset the progress counter to another full increment
nextProgress = currentIncrement;
}
}
/**
* @see java.io.OutputStream#close()
*/
public void close() throws IOException {
if (console != null) {
console.close();
}
monitor.done();
}
/**
* @see java.io.OutputStream#flush()
*/
public void flush() throws IOException {
if (console != null) {
console.flush();
}
}
/**
* @see java.io.OutputStream#write(int)
*/
public synchronized void write(int b) throws IOException {
if (console != null) {
console.write(b);
}
progressUpdate();
}
/**
* @see java.io.OutputStream#write(...)
*/
public synchronized void write(byte[] b, int off, int len) throws IOException {
if (b == null) {
throw new NullPointerException();
} else if (off != 0 || (len < 0) || (len > b.length)) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return;
}
if (console != null) {
console.write(b, off, len);
}
progressUpdate();
}
public int getWorkDone() {
return worked;
}
}
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