/**
* Copyright 2004-2016 Riccardo Solmi. All rights reserved.
* This file is part of the Whole Platform.
*
* The Whole Platform 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 3 of the License, or
* (at your option) any later version.
*
* The Whole Platform 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 the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
*/
package org.whole.lang.e4.ui.util;
/**
* @author Enrico Persiani
*/
public class ChangeTracker {
public static final Object SKIP = new Object();
protected Object[] tracked;
protected ChangeTracker(Object... tracked) {
this.tracked = tracked;
}
public static ChangeTracker create(Object... tracked) {
return new ChangeTracker(tracked);
}
public boolean isChanged(Object... objects) {
if (tracked.length != objects.length)
return true;
for (int i=0; i<objects.length; i++)
if (objects[i] != SKIP && !objects[i].equals(tracked[i]))
return true;
return false;
}
public synchronized boolean testChangedAndUpdate(Object... objects) {
boolean changed = isChanged(objects);
if (changed) {
Object[] updated = new Object[objects.length];
for (int i=0; i<objects.length; i++)
updated[i] = (objects[i] == SKIP && i<tracked.length) ? tracked[i] : objects[i];
tracked = updated;
}
return changed;
}
}