// @formatter:off
/*
 * Pexel Project - Minecraft minigame server platform. 
 * Copyright (C) 2014 Matej Kormuth <http://www.matejkormuth.eu>
 * 
 * This file is part of Pexel.
 * 
 * Pexel 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, either version 3 of the License, or (at your option) any later version.
 * 
 * Pexel 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, see
 * <http://www.gnu.org/licenses/>.
 *
 */
// @formatter:on
package eu.matejkormuth.pexel.PexelCore.util;

public class Watcher<T> {
    private T        lastState;
    private Runnable onChanged;
    
    public void check(final T value) {
        if (this.changed(value)) {
            this.lastState = value;
            this.onChanged.run();
        }
    }
    
    public boolean changed(final T value) {
        return this.lastState == value;
    }
    
    public void setOnChanged(final Runnable onChanged) {
        this.onChanged = onChanged;
    }
}
