plugins/org.eclipse.qvtd.pivot.qvtcore/src/org/eclipse/qvtd/pivot/qvtcore/utilities/QVTcoreASResourceFactory.java

/*******************************************************************************
 * Copyright (c) 2013, 2015 Willink Transformations and others.
 * 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:
 *   E.D.Willink - Initial API and implementation
 *******************************************************************************/
package org.eclipse.qvtd.pivot.qvtcore.utilities;

import java.util.Map;

import org.eclipse.emf.ecore.resource.ContentHandler;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.xmi.impl.RootXMLContentHandlerImpl;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.ocl.pivot.internal.prettyprint.PrettyPrintVisitor;
import org.eclipse.ocl.pivot.internal.prettyprint.PrettyPrinter;
import org.eclipse.ocl.pivot.internal.resource.ASResourceFactory;
import org.eclipse.ocl.pivot.internal.resource.ASSaver;
import org.eclipse.ocl.pivot.internal.resource.AbstractASResourceFactory;
import org.eclipse.ocl.pivot.internal.utilities.AS2Moniker;
import org.eclipse.ocl.pivot.internal.utilities.AS2XMIid;
import org.eclipse.ocl.pivot.utilities.AS2MonikerVisitor;
import org.eclipse.ocl.pivot.utilities.AS2XMIidVisitor;
import org.eclipse.ocl.pivot.utilities.ASSaverLocateVisitor;
import org.eclipse.ocl.pivot.utilities.ASSaverNormalizeVisitor;
import org.eclipse.ocl.pivot.utilities.ASSaverResolveVisitor;
import org.eclipse.ocl.pivot.utilities.ToStringVisitor;
import org.eclipse.qvtd.pivot.qvtcore.QVTcorePackage;

/**
 * QVTcoreASResourceFactory supports creation of a QVTcore AS resource and associated artefacts.
 */
public class QVTcoreASResourceFactory extends AbstractASResourceFactory
{
	public static final @NonNull String FILE_EXTENSION = "qvtcas";

	private static @Nullable QVTcoreASResourceFactory INSTANCE = null;

	public static synchronized @NonNull QVTcoreASResourceFactory getInstance() {
		if (INSTANCE == null) {
			Map<String, Object> extensionToFactoryMap = Resource.Factory.Registry.INSTANCE.getExtensionToFactoryMap();
			Object object = extensionToFactoryMap.get(FILE_EXTENSION);
			if (object instanceof Resource.Factory.Descriptor) {
				INSTANCE = (QVTcoreASResourceFactory) ((Resource.Factory.Descriptor)object).createFactory();	// Create the registered singleton
			}
			else {
				INSTANCE = new QVTcoreASResourceFactory();														// Create our own singleton
			}
			assert INSTANCE != null;
			INSTANCE.install(null,  null);
		}
		assert INSTANCE != null;
		return INSTANCE;
	}

	private static final @NonNull ContentHandler CONTENT_HANDLER = new RootXMLContentHandlerImpl(
		QVTcorePackage.eCONTENT_TYPE, new String[]{FILE_EXTENSION},
		RootXMLContentHandlerImpl.XMI_KIND, QVTcorePackage.eNS_URI, null);
	
	static {
		installContentHandler(ContentHandler.Registry.NORMAL_PRIORITY, CONTENT_HANDLER);
	}
	
	/**
	 * Creates an instance of the resource factory.
	 */
	public QVTcoreASResourceFactory() {
		super(QVTcorePackage.eCONTENT_TYPE);
	}

	@Override
	public void configure(@NonNull ResourceSet resourceSet) {
		Resource.Factory.Registry resourceFactoryRegistry = resourceSet.getResourceFactoryRegistry();
		resourceFactoryRegistry.getExtensionToFactoryMap().put(FILE_EXTENSION, this);
	}

	@Override
	public @NonNull AS2MonikerVisitor createAS2MonikerVisitor(@NonNull AS2Moniker as2moniker) {
		return new QVTcoreAS2MonikerVisitor(as2moniker);
	}

	@Override
	public @NonNull AS2XMIidVisitor createAS2XMIidVisitor(@NonNull AS2XMIid as2id) {
		return new QVTcoreAS2XMIidVisitor(as2id);
	}

	@Override
	public @NonNull ASSaverLocateVisitor createASSaverLocateVisitor(@NonNull ASSaver asSaver) {
		return new QVTcoreASSaverLocateVisitor(asSaver);
	}

	@Override
	public @NonNull ASSaverNormalizeVisitor createASSaverNormalizeVisitor(@NonNull ASSaver saver) {
		return new QVTcoreASSaverNormalizeVisitor(saver);
	}

	@Override
	public @NonNull ASSaverResolveVisitor createASSaverResolveVisitor(@NonNull ASSaver asSaver) {
		return new QVTcoreASSaverResolveVisitor(asSaver);
	}

	@Override
	public @NonNull PrettyPrintVisitor createPrettyPrintVisitor(@NonNull PrettyPrinter printer) {
		return new QVTcorePrettyPrintVisitor(printer);
	}

	@Override
	public @NonNull ToStringVisitor createToStringVisitor(@NonNull StringBuilder s) {
		return new QVTcoreToStringVisitor(s);
	}

	@Override
	public @NonNull ASResourceFactory getASResourceFactory() {
		return getInstance();
	}
}