/**
* 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.InputPorts;
import com.rapidminer.operator.ports.OutputPorts;
import com.rapidminer.operator.ports.PortPairExtender;
/**
* Passes output <var>i</var> to input <var>i</var>. generated by a {@link PortPairExtender}.
*
* @author Simon Fischer
*/
public class ManyToManyPassThroughRule implements MDTransformationRule {
private InputPorts inputPorts;
private OutputPorts outputPorts;
public ManyToManyPassThroughRule(InputPorts inputPorts, OutputPorts outputPorts) {
this.inputPorts = inputPorts;
this.outputPorts = outputPorts;
}
@Override
public void transformMD() {
assert (inputPorts.getNumberOfPorts() == outputPorts.getNumberOfPorts());
int numIn = inputPorts.getNumberOfPorts();
int numOut = outputPorts.getNumberOfPorts();
int num = numIn < numOut ? numIn : numOut;
for (int i = 0; i < num; i++) {
MetaData metaData = inputPorts.getPortByIndex(i).getMetaData();
if (metaData != null) {
metaData = metaData.clone();
metaData.addToHistory(outputPorts.getPortByIndex(i));
outputPorts.getPortByIndex(i).deliverMD(modifyMetaData(metaData));
} else {
outputPorts.getPortByIndex(i).deliverMD(null);
}
}
}
/**
* Modifies the received meta data before it is passed to the output. Can be used if the
* transformation depends on parameters etc. The default implementation just returns the
* original. Subclasses may safely modify the meta data, since a copy is used for this method.
*/
public MetaData modifyMetaData(MetaData unmodifiedMetaData) {
return unmodifiedMetaData;
}
}