/**
* Global Sensor Networks (GSN) Source Code
* Copyright (c) 2006-2016, Ecole Polytechnique Federale de Lausanne (EPFL)
* 
* This file is part of GSN.
* 
* GSN 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.
* 
* GSN 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 GSN.  If not, see <http://www.gnu.org/licenses/>.
* 
* File: src/weka/filters/unsupervised/instance/FilterFromSelection.java
*
* @author Julien Eberle
* @author Sofiane Sarni
*
*/

package weka.filters.unsupervised.instance;

import weka.core.Instances;
import weka.core.OptionHandler;
import weka.filters.UnsupervisedFilter;

/**
 * A filter that choose the instances according to a boolean vector.
 * @author jeberle
 *
 */
public class FilterFromSelection extends weka.filters.SimpleBatchFilter implements UnsupervisedFilter, OptionHandler{

	/**
	 * 
	 */
	private static final long serialVersionUID = -6080185146245135909L;
	
	private boolean[] m_select = null;
	

	@Override
	public String globalInfo() {
		return "A filter that choose the instances according to a boolean vector.";
	}

	@Override
	protected Instances determineOutputFormat(Instances inputFormat)
			throws Exception {
		return inputFormat;
	}

	@Override
	protected Instances process(Instances instances) throws Exception {
		if (m_select == null || m_select.length != instances.numInstances()){
			return instances;
		}
		else{
			Instances output = new Instances(instances);
			for(int i=m_select.length-1;i>=0;i--){
				if(!m_select[i]){output.delete(i);}
			}
			return output;
		}
	}
	
	public boolean[] getM_select() {
		return m_select;
	}

	public void setM_select(boolean[] m_select) {
		this.m_select = m_select;
	}
}