/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.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.example.table;
import com.rapidminer.example.NominalStatistics;
import com.rapidminer.example.UnknownStatistics;
/**
* This class holds all information on a single nominal attribute. In addition
* to the generic attribute fields this class keeps information about the
* nominal values and the value to index mappings. If one of the methods
* designed for numerical attributes was invoked a RuntimeException will be
* thrown.
*
* It will be guaranteed that all values are mapped to indices without any
* missing values. This could, however, be changed in future versions thus
* operators should not rely on this fact.
*
* @author Ingo Mierswa
* @version $Id: NominalAttribute.java,v 2.12 2006/04/05 08:57:22 ingomierswa
* Exp $
*/
public abstract class NominalAttribute extends AbstractAttribute {
/**
*
*/
private static final long serialVersionUID = -3830980883541763869L;
/* pp */ NominalAttribute(String name, int valueType) {
super(name, valueType);
registerStatistics(new NominalStatistics());
registerStatistics(new UnknownStatistics());
}
/* pp */ NominalAttribute(NominalAttribute other) {
super(other);
}
public boolean isNominal() {
return true;
}
public boolean isNumerical() {
return false;
}
/**
* Returns a string representation and maps the value to a string if type is
* nominal. The number of digits is ignored.
*/
public String getAsString(double value, int digits, boolean quoteWhitespace) {
if (Double.isNaN(value)) {
return "?";
} else {
try {
String result = getMapping().mapIndex((int) value);
if (quoteWhitespace) {
if (result.indexOf(" ") >= 0) {
result = "\"" + result + "\"";
}
}
return result;
} catch (Throwable e) {
return "?";
}
}
}
}