/**
* 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.generator;
import com.rapidminer.tools.LogService;
import java.util.logging.Level;
/**
* This class is a very simple implementation of a FeatureGenerator. It has two numerical input
* attributes and one output attribute. Depending on the mode specified in the constructor the
* result will be the sum, difference, product or quotient. The four modes are numered from 0 to 3
* int this order.
*
* @author Simon Fischer, Ingo Mierswa 15:35:40 ingomierswa Exp $
*/
public class BasicArithmeticOperationGenerator extends BinaryNumericalGenerator {
public static final int SUM = 0;
public static final int DIFFERENCE = 1;
public static final int PRODUCT = 2;
public static final int QUOTIENT = 3;
private static final String[] FUNCTION_NAMES = { "+", "-", "*", "/" };
private int mode;
public BasicArithmeticOperationGenerator(int mode) {
this.mode = mode;
}
public BasicArithmeticOperationGenerator() {}
@Override
public boolean isSelfApplicable() {
return mode == PRODUCT;
}
@Override
public boolean isCommutative() {
return ((mode == PRODUCT) || (mode == SUM));
}
@Override
public FeatureGenerator newInstance() {
return new BasicArithmeticOperationGenerator(mode);
}
@Override
public double calculateValue(double o1, double o2) {
double r = 0.0d;
switch (mode) {
case SUM:
r = o1 + o2;
break;
case DIFFERENCE:
r = o1 - o2;
break;
case PRODUCT:
r = o1 * o2;
break;
case QUOTIENT:
r = o1 / o2;
break;
}
return r;
}
@Override
public void setFunction(String name) {
for (int i = 0; i < FUNCTION_NAMES.length; i++) {
if (FUNCTION_NAMES[i].equals(name)) {
this.mode = i;
return;
}
}
// LogService.getGlobal().log("Illegal function name '" + name + "' for " +
// getClass().getName() + ".", LogService.ERROR);
LogService.getRoot().log(Level.SEVERE,
"com.rapidminer.generator.BasicArithmeticOperationGenerator.illegal_function_name",
new Object[] { name, getClass().getName() });
}
@Override
public String getFunction() {
return FUNCTION_NAMES[mode];
}
@Override
public boolean equals(Object o) {
return (super.equals(o) && (this.mode == ((BasicArithmeticOperationGenerator) o).mode));
}
@Override
public int hashCode() {
return super.hashCode() ^ Integer.valueOf(mode).hashCode();
}
}