/**
* 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.learner.tree;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.Example;
/**
* A split condition for numerical missing values (equals).
*
* @author Gisa Schaefer
*/
public class NumericalMissingSplitCondition extends AbstractSplitCondition {
private static final long serialVersionUID = 3883155435836330171L;
/** the symbol displayed in the decision tree for numerical missing values */
private static final String SYMBOL_MISSING_NUMERICAL = "?";
public NumericalMissingSplitCondition(Attribute attribute) {
super(attribute.getName());
}
@Override
public boolean test(Example example) {
double currentValue = example.getValue(example.getAttributes().get(getAttributeName()));
return Double.isNaN(currentValue);
}
@Override
public String getRelation() {
return "=";
}
@Override
public String getValueString() {
return SYMBOL_MISSING_NUMERICAL;
}
}