/**
* 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.tools.expression.internal.function.logical;
import com.rapidminer.tools.expression.FunctionDescription;
/**
* Class for the NOT function that has 1 logical (numerical, true or false) input
*
* @author Sabrina Kirstein
*
*/
public class Not extends AbstractLogicalFunctionWith1Input {
/**
* Constructs a NOT Function with 1 parameter with {@link FunctionDescription}
*/
public Not() {
super("logical.not");
}
@Override
protected Boolean compute(double value) {
// if the given value is double missing -> return boolean missing
if (Double.isNaN(value)) {
return null;
}
// else if the value is zero (false) -> return true
else if (Math.abs(value) < Double.MIN_VALUE * 2) {
return true;
} else {
// if the given value is not zero (true) -> return false
return false;
}
}
@Override
protected Boolean compute(Boolean value) {
// if the given value is missing -> return missing
if (value == null) {
return null;
// if the given value is true -> return false
} else if (value) {
return false;
// if the given value is false -> return true
} else {
return true;
}
}
}