/*
* EmptyFilter.java
*
* Copyright (c) 2010, Ralf Biedert, DFKI. All rights reserved.
*
* 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 Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*
*/
package de.dfki.km.text20.util.filter;
import java.util.ArrayList;
import java.util.List;
import de.dfki.km.text20.services.trackingdevices.eyes.EyeTrackingEvent;
/**
* Allows chaining of several filters and makes them execute sequentially.
*
* @author Eugen Massini
*/
public class ChainedFilter extends AbstractFilter {
private final List<AbstractFilter> filters = new ArrayList<AbstractFilter>();
/**
* Adds a filter to the chain.
*
* @param filter
*/
public void addFilter(final AbstractFilter filter) {
this.filters.add(filter);
}
@Override
public EyeTrackingEvent filterEvent(final EyeTrackingEvent event) {
EyeTrackingEvent e = event; // use a new variable to suppress warning
for (final AbstractFilter filter : this.filters) {
e = filter.filterEvent(e);
}
return e;
}
}