/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.features;
import java.util.LinkedList;
import java.util.List;
/**
* A <tt>PopulationOperator</tt> that modifies a population by modifying all
* individuals independently. The modifications can be made each per attribute
* block or for single attributes.
*
* @author Simon Fischer, Ingo Mierswa
* @version $Id: IndividualOperator.java,v 2.17 2006/03/27 13:21:58 ingomierswa
* Exp $ <br>
*/
public abstract class IndividualOperator implements PopulationOperator {
/**
* Subclasses must implement this method providing a list of new
* individuals. <tt>individual</tt> will be removed from the population so
* it might be useful to return a list of size 1 containing only the
* modified <tt>individual</tt>. If the original individual should also
* be part of the new population it must also be added to the result list.
*/
public abstract List<Individual> operate(Individual individual) throws Exception;
/**
* Operates on all individuals, removes the original individuals and adds
* the new ones.
*/
public void operate(Population pop) throws Exception {
List<Individual> newIndividuals = new LinkedList<Individual>();
for (int i = 0; i < pop.getNumberOfIndividuals(); i++) {
List<Individual> individuals = operate(pop.get(i));
newIndividuals.addAll(individuals);
}
pop.clear();
pop.addAllIndividuals(newIndividuals);
}
/** The default implementation returns true for every generation. */
public boolean performOperation(int generation) {
return true;
}
}