/**
* 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.operator.ports.InputPort;
import com.rapidminer.operator.ports.metadata.AttributeMetaData;
/**
* This is the interface for all classes, that implement the delivery of meta data for certain
* {@link AggregationFunction}s.
*
* @author Sebastian Land
*/
public interface AggregationFunctionMetaDataProvider {
/**
* This method must return an {@link AttributeMetaData} for the target attribute, or null if the
* source attribute's valuetype is incompatible. Then an error should be registered on the
* inputport unless the port is null. In cases, where the sourceAttribute is unknown during the
* aggregation, only a warning should be registered in the port, but it should be assumed, that
* the attribute will be present.
*/
public AttributeMetaData getTargetAttributeMetaData(AttributeMetaData sourceAttribute, InputPort port);
}