/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.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.construction;
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 Ingo Mierswa
*/
public abstract class ExampleSetBasedIndividualOperator implements ExampleSetBasedPopulationOperator {
/**
* 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<ExampleSetBasedIndividual> operate(ExampleSetBasedIndividual individual) throws Exception;
/**
* Operates on all individuals, removes the original individuals and adds the new ones.
*/
@Override
public void operate(ExampleSetBasedPopulation pop) throws Exception {
List<ExampleSetBasedIndividual> newIndividuals = new LinkedList<ExampleSetBasedIndividual>();
for (int i = 0; i < pop.getNumberOfIndividuals(); i++) {
List<ExampleSetBasedIndividual> individuals = operate(pop.get(i));
newIndividuals.addAll(individuals);
}
pop.clear();
pop.addAllIndividuals(newIndividuals);
}
/** The default implementation returns true for every generation. */
@Override
public boolean performOperation(int generation) {
return true;
}
}