/*
* 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;
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);
}
}