/*******************************************************************************
* Copyright (c) 2000, 2015 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.internal.search;
import org.eclipse.core.runtime.*;
/**
* Progress Monitor, that accumulates work without communicating it immidiately
* to the underlying monitor. The work is sent in larger chunks for performance
* reasons.
*/
class LazyProgressMonitor extends ProgressMonitorWrapper {
// maximum number of times worked() should be called
// on underlying progress monitor
private static final int MAX_STEPS = 100;
private final IProgressMonitor monitor;
private int totalWork;
private int work;
private int lastWorked;
private int treshold;
protected LazyProgressMonitor(IProgressMonitor monitor) {
super(monitor);
this.monitor = monitor;
}
/**
* @see IProgressMonitor#beginTask
*/
@Override
public void beginTask(String name, int totalWork) {
if (totalWork > 0) {
this.totalWork = totalWork;
}
monitor.beginTask(name, totalWork);
work = 0;
lastWorked = 0;
treshold = 1 + totalWork / MAX_STEPS;
}
/**
* @see IProgressMonitor#worked
*/
@Override
public void worked(int newWork) {
this.work += newWork;
if (work >= treshold) {
monitor.worked(work - lastWorked);
lastWorked = work;
treshold = work + 1 + totalWork / MAX_STEPS;
}
}
}