/*
* 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.ports.metadata;
import java.util.List;
import com.rapidminer.operator.ports.InputPort;
import com.rapidminer.operator.ports.OutputPort;
/** 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;
}
}