/**
* 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;
import com.rapidminer.operator.ports.InputPort;
import com.rapidminer.operator.ports.InputPortExtender;
import com.rapidminer.operator.ports.OutputPort;
/**
* This operator returns the first non-null input it receives.
*
* @author Simon Fischer
*
*/
public class IOMerger extends Operator {
private final OutputPort outputPort = getOutputPorts().createPort("output");
private final InputPortExtender inputExtender = new InputPortExtender("input", getInputPorts());
public IOMerger(OperatorDescription description) {
super(description);
inputExtender.start();
getTransformer().addRule(inputExtender.makePassThroughRule(outputPort));
}
@Override
public void doWork() {
for (InputPort inputPort : inputExtender.getManagedPorts()) {
IOObject input = inputPort.getAnyDataOrNull();
if (input != null) {
outputPort.deliver(input);
return;
}
}
outputPort.deliver(null);
}
}