/* $Id: InitializeModel.java 17766 2010-01-11 21:21:20Z linus $
 *****************************************************************************
 * Copyright (c) 2009 Contributors - see below
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    tfmorris
 *****************************************************************************
 *
 * Some portions of this file was previously release using the BSD License:
 */

// Copyright (c) 2007 The Regents of the University of California. All
// Rights Reserved. Permission to use, copy, modify, and distribute this
// software and its documentation without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph appear in all copies. This software program and
// documentation are copyrighted by The Regents of the University of
// California. The software program and documentation are supplied "AS
// IS", without any accompanying services from The Regents. The Regents
// does not warrant that the operation of the program will be
// uninterrupted or error-free. The end-user understands that the program
// was developed for research purposes and is advised not to rely
// exclusively on the program for any reason. IN NO EVENT SHALL THE
// UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
// SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
// ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
// THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
// PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
// CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
// UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

package org.argouml.model;

import junit.framework.TestCase;

/**
 * Class to initialize the model.
 *
 * @author lito
 */
public final class InitializeModel {
    
    /**
     * The default model implementation to start.
     */
    private static final String DEFAULT_MODEL_IMPLEMENTATION =
        "org.argouml.model.mdr.MDRModelImplementation";


    /**
     * This is never instantiated.
     */
    private InitializeModel() {
    }
    
    /**
     * Initialize the Model subsystem with the default ModelImplementation.
     */
    public static void initializeDefault() {
    	if (Model.isInitiated()) {
    	    return;
    	}
        String className =
            System.getProperty(
                    "argouml.model.implementation",
                    DEFAULT_MODEL_IMPLEMENTATION);
        initializeModelImplementation(className);
    }

    /**
     * Initialize the Model subsystem with the MDR ModelImplementation.
     */
    public static void initializeMDR() {
        initializeModelImplementation(
                "org.argouml.model.mdr.MDRModelImplementation");
    }

    /**
     * Initialize the Model subsystem with the Mock Implementation.
     *
     * @return the newly created MockModelImplementation.
     */
    public static MockModelImplementation initializeMock() {
        return (MockModelImplementation)
            initializeModelImplementation(
                "org.argouml.model.MockModelImplementation");
    }

    private static ModelImplementation initializeModelImplementation(
            String name) {
        ModelImplementation impl = null;

        Class implType;
        try {
            implType =
                Class.forName(name);
        } catch (ClassNotFoundException e) {
            TestCase.fail(e.toString());
            return null;
        }

        try {
            impl = (ModelImplementation) implType.newInstance();
        } catch (InstantiationException e) {
            TestCase.fail(e.toString());
        } catch (IllegalAccessException e) {
            TestCase.fail(e.toString());
        }
        Model.setImplementation(impl);
        return impl;
    }
}