trunk/workflowmodel-impl/src/main/java/net/sf/taverna/t2/workflowmodel/impl/AddProcessorInputPortEdit.java

/*******************************************************************************
 * Copyright (C) 2007 The University of Manchester   
 * 
 *  Modifications to the initial code base are copyright of their
 *  respective authors, or their employers as appropriate.
 * 
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2.1 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
 *  Lesser General Public License for more details.
 *    
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 ******************************************************************************/
package net.sf.taverna.t2.workflowmodel.impl;

import net.sf.taverna.t2.workflowmodel.EditException;
import net.sf.taverna.t2.workflowmodel.Processor;
import net.sf.taverna.t2.workflowmodel.ProcessorInputPort;
import net.sf.taverna.t2.workflowmodel.processor.iteration.NamedInputPortNode;
import net.sf.taverna.t2.workflowmodel.processor.iteration.impl.IterationStrategyImpl;

import org.jdom.Element;

/**
 * Build a new input port on a processor, also modifies the processor's
 * iteration strategy or strategies to ensure the new port is bound into them.
 * 
 * @author Tom Oinn
 * 
 */
public class AddProcessorInputPortEdit extends AbstractProcessorEdit {

	Element previousIterationStrategyState = null;

	private final ProcessorInputPortImpl port;

	public AddProcessorInputPortEdit(Processor p, ProcessorInputPort port) {
		super(p);
		this.port = (ProcessorInputPortImpl)port;
		
	}

	@Override
	protected void doEditAction(ProcessorImpl processor) throws EditException {
		// Add a new InputPort object to the processor and also create an
		// appropriate NamedInputPortNode in any iteration strategies. By
		// default set the desired drill depth on each iteration strategy node
		// to the same as the input port, so this won't automatically trigger
		// iteration staging unless the depth is altered on the iteration
		// strategy itself.)
		if (processor.getInputPortWithName(port.getName()) != null) {
			throw new EditException(
					"Attempt to create duplicate input port with name '"
							+ port.getName() + "'");
		}
		previousIterationStrategyState = processor.iterationStack.asXML();
		processor.inputPorts.add(port);
		for (IterationStrategyImpl is : processor.iterationStack.getStrategies()) {
			NamedInputPortNode nipn = new NamedInputPortNode(port.getName(),
					port.getDepth());
			is.addInput(nipn);
			is.connectDefault(nipn);
		}

	}

	@Override
	protected void undoEditAction(ProcessorImpl processor) {
		processor.iterationStack
				.configureFromElement(previousIterationStrategyState);
		processor.inputPorts
				.remove(processor.getInputPortWithName(port.getName()));
	}

}