/**
* 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.ports.metadata;
import com.rapidminer.operator.ports.InputPort;
import com.rapidminer.operator.ports.OutputPort;
import java.util.List;
/**
* Passes meta data through and recursively unfolds element meta data if CollectionMetaData is
* found.
*
* @author Simon Fischer
*
*/
public class FlatteningPassThroughRule implements MDTransformationRule {
private final List<InputPort> inputPorts;
private final OutputPort outputPort;
public FlatteningPassThroughRule(List<InputPort> inputPorts, OutputPort outputPort) {
this.inputPorts = inputPorts;
this.outputPort = outputPort;
}
@Override
public void transformMD() {
for (InputPort inputPort : inputPorts) {
MetaData metaData = inputPort.getMetaData();
if (metaData != null) {
if (metaData instanceof CollectionMetaData) {
metaData = ((CollectionMetaData) metaData).getElementMetaDataRecursive();
}
metaData = metaData.clone();
metaData.addToHistory(outputPort);
outputPort.deliverMD(modifyMetaData(metaData));
return;
}
}
outputPort.deliverMD(null);
}
protected MetaData modifyMetaData(MetaData metaData) {
return metaData;
}
}