/**
* 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.preprocessing.sampling.sequences;
import com.rapidminer.tools.RandomGenerator;
/**
* This sampling sequence guarantees that the resulting sequence will contain either all elements or
* exactly as much as given as target.
*
* @author Sebastian Land
*/
public class AbsoluteSamplingSequenceGenerator extends SamplingSequenceGenerator {
private int toCome;
private int toAccept;
public AbsoluteSamplingSequenceGenerator(int source, int target, RandomGenerator random) {
super(random);
this.toCome = source;
this.toAccept = target;
}
@Override
public boolean useNext() {
boolean accept = (random.nextInt(toCome) + 1) <= toAccept;
if (accept) {
toAccept--;
}
toCome--;
return accept;
}
}