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The INGENIAS Development Kit
There is a newer version: 1.6
/** 
 * Copyright (C) 2010  Jorge J. Gomez-Sanz 
 * 
 * This file is part of the INGENME tool. INGENME is an open source meta-editor
 * which produces customized editors for user-defined modeling languages
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 3 of the License
 *
 * 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see 
 **/

package ingenias.generator.browser;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.*;

import org.jgraph.graph.DefaultEdge;
import org.jgraph.graph.DefaultGraphCell;
import org.jgraph.graph.GraphCell;

import ingenias.editor.Editor;
import ingenias.editor.cell.*;
import ingenias.editor.entities.*;

public class RelationshipFactory  {

	public static DefaultGraphCell getNRelationshipInstance(String relationshipName,
			GraphCell[] extremes, Browser browser) {

		// Search for NAryEdges in selected.
		int nAryEdgesNum = 0;
		int edgesNum = 0;
		NAryEdge selectedEdge = null;
		for (int i = 0; i < extremes.length; i++) {
			if (extremes[i] instanceof NAryEdge) {
				nAryEdgesNum++;
				selectedEdge = (NAryEdge) extremes[i];
			} else if (extremes[i] instanceof DefaultEdge) {
				edgesNum++;

			}
		}
		if (nAryEdgesNum <= 1 && edgesNum == 0) {
				// ResponsibleNEdge already exists.
				if (nAryEdgesNum == 1) {
					return selectedEdge;
				}
				// There is no NAryEdges in selected.
				else if (nAryEdgesNum == 0) {
					Class relEntity;
					try {
						relEntity = Class.forName("ingenias.editor.entities."+relationshipName);
						Constructor relEntityCons = relEntity.getConstructor(new Class[]{String.class});					
						Object relEntityInstance = relEntityCons.newInstance(new Object[]{Editor.getNewId(browser)});					
						Class edgeEntity=Class.forName("ingenias.editor.cell."+relationshipName+"Edge");
						Constructor edgeEntityCons = edgeEntity.getConstructor(new Class[]{relEntity});
						Object edgeEntityIns = edgeEntityCons.newInstance(new Object[]{relEntityInstance});
						return (DefaultGraphCell)edgeEntityIns;
					} catch (ClassNotFoundException e) {						
						e.printStackTrace();
					} catch (SecurityException e) {
						e.printStackTrace();
					} catch (NoSuchMethodException e) {
						e.printStackTrace();
					} catch (IllegalArgumentException e) {
						e.printStackTrace();
					} catch (InstantiationException e) {
						e.printStackTrace();
					} catch (IllegalAccessException e) {
						e.printStackTrace();
					} catch (InvocationTargetException e) {
						e.printStackTrace();
					}
					
				}
			}
		
		return null;
	}
}