/**
* 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.transformation.aggregation;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.table.AttributeFactory;
/**
* This class implements the Sum Aggregation function. This will calculate the sum of a source
* attribute for each group.
*
* @author Sebastian Land
*/
public abstract class NumericalAggregationFunction extends AggregationFunction {
private Attribute targetAttribute;
public NumericalAggregationFunction(Attribute sourceAttribute, boolean ignoreMissings, boolean countOnlyDisctinct,
String functionName, String separatorOpen, String separatorClose) {
super(sourceAttribute, ignoreMissings, countOnlyDisctinct);
this.targetAttribute = AttributeFactory.createAttribute(functionName + separatorOpen
+ getSourceAttribute().getName() + separatorClose, getTargetValueType(sourceAttribute.getValueType()));
}
/**
* Returns the attribute type to assign to the created {@link #targetAttribute} given the value
* type of the source attribute.
*/
protected abstract int getTargetValueType(int sourceValueType);
@Override
public Attribute getTargetAttribute() {
return targetAttribute;
}
}