/*
* RapidMiner
*
* Copyright (C) 2001-2011 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.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;
}
}