WeightedBootstrapping.java

/**
 * 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;

import com.rapidminer.example.Attributes;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.example.set.MappedExampleSet;
import com.rapidminer.operator.OperatorDescription;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.operator.UserError;

import java.util.Random;


/**
 * This operator constructs a bootstrapped sample from the given example set which must provide a
 * weight attribute. If no weight attribute was provided this operator will stop the process with an
 * error message. See the operator {@link Bootstrapping} for more information.
 * 
 * @author Ingo Mierswa
 */
public class WeightedBootstrapping extends AbstractBootstrapping {

	public WeightedBootstrapping(OperatorDescription description) {
		super(description);
	}

	@Override
	public int[] createMapping(ExampleSet exampleSet, int size, Random random) throws OperatorException {
		if (exampleSet.getAttributes().getWeight() == null) {
			throw new UserError(this, 113, Attributes.WEIGHT_NAME);
		}
		return MappedExampleSet.createWeightedBootstrappingMapping(exampleSet, size, random);
	}
}