/**
* 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.Example;
import com.rapidminer.example.table.DataRow;
/**
*
* @author Sebastian Land
*
*/
public interface Aggregator {
/**
* This will count the given example to the group this {@link Aggregator} belongs to. The
* respective attribute will be queried from the {@link AggregationFunction} this was created
* by.
*/
public void count(Example example);
/**
* This does the same as {@link #count(Example)}, but will take the weight of the current
* example into account.
*/
public void count(Example example, double weight);
/**
* This will set the result value into the data row onto the position of the given attribute.
*/
public void set(Attribute attribute, DataRow row);
}