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/**
* <copyright>
*
* Copyright (c) 2005-2006 Sven Efftinge (http://www.efftinge.de) 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:
* Sven Efftinge (http://www.efftinge.de) - Initial API and implementation
*
* </copyright>
*/
package org.eclipse.xtend.typesystem.emf;
import java.io.IOException;
import java.lang.reflect.Field;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.EcorePackage;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.URIConverter;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.xmi.impl.XMIResourceFactoryImpl;
import org.eclipse.emf.mwe.core.ConfigurationException;
import org.eclipse.emf.mwe.core.resources.ResourceLoaderFactory;
/**
* Provides useful functions for usage of EMF.
* @since 4.0
*/
public class EcoreUtil2 {
private final static Log log = LogFactory.getLog(EcoreUtil2.class);
static {
Resource.Factory.Registry.INSTANCE.getExtensionToFactoryMap().put(Resource.Factory.Registry.DEFAULT_EXTENSION, new XMIResourceFactoryImpl());
EPackage.Registry.INSTANCE.put(EcorePackage.eINSTANCE.getNsURI(), EcorePackage.eINSTANCE);
}
public final static EPackage getEPackage(final String pathToEcoreFile) {
EPackage result = null;
final URI fileURI = getURI(pathToEcoreFile);
if (fileURI == null)
throw new RuntimeException("cannot resolve EPackage for " + pathToEcoreFile + ". Probably cannot find the .ecore file.");
try {
final Resource res = new ResourceSetImpl().createResource(fileURI);
if (res == null)
throw new ConfigurationException("No ecore model file '" + pathToEcoreFile + "' found! (" + fileURI.toString() + ")");
res.load(new HashMap());
result = (EPackage) res.getContents().get(0);
if (result.getNsURI() != null) {
if (EPackage.Registry.INSTANCE.containsKey(result.getNsURI())) {
result = EPackage.Registry.INSTANCE.getEPackage(result.getNsURI());
} else {
EPackage.Registry.INSTANCE.put(result.getNsURI(), result);
URIConverter.URI_MAP.put(URI.createURI(result.getNsURI()), fileURI);
}
}
return result;
} catch (final IOException e) {
throw new ConfigurationException(e);
} finally {
logPackages();
}
}
private static void logPackages() {
// if (log.isDebugEnabled()) {
// Set s = EPackage.Registry.INSTANCE.keySet();
// log.debug("registered EPackages:");
// List l = new ArrayList(s);
// for (int i = 0, x = l.size(); i < x; i++) {
// Object o = l.get(i);
// log.debug((i + 1) + ") " + o + " : " + ((EPackage)
// EPackage.Registry.INSTANCE.get(o)).getName());
// }
// }
}
/**
* Finds all elements within a collection of a specific type.
* @param iter An iterator over the source collection.
* @param type The type which should be selected.
* @return A set with all elements of the specified type.
*/
public static Set<EObject> findAllByType(final Iterator iter, final Class type) {
final Set<EObject> result = new HashSet<EObject>();
while (iter.hasNext()) {
final EObject curr = (EObject) iter.next();
if (type.isInstance(curr))
result.add(curr);
}
return result;
}
/**
* Clones a list.
* @param list The list that should be cloned.
* @return A copy of the original list
*/
public static List clone(final EList list) {
if (list==null)
return null;
final List res = new ArrayList();
res.addAll(list);
return res;
}
/**
* Finds an EMF EPackage instance by its class name. The EPackage class must be loadable by the
* ResourceLoader
* @param ePackage The class name of the EPackage interface
* @return The EPackage instance. Returns <code>null</code> if any exception occurs after the class
* was successfully loaded.
* @throws ConifgurationException If the class specified by <tt>ePackage</tt> cannot be loaded.
*/
public static EPackage getEPackageByClassName(final String ePackage) throws ConfigurationException {
Class clazz;
try {
// try to load the EPackage class with the ResourceLoader
clazz = ResourceLoaderFactory.createResourceLoader().loadClass(ePackage);
if (clazz == null)
throw new ConfigurationException("Couldn't find class " + ePackage);
// each EPackage class has an 'eINSTANCE' field which holds the implementation instance
final Field f = clazz.getField("eINSTANCE");
// retrieve the EPackage instance from the eINSTANCE field
final EPackage result = (EPackage) f.get(null);
// register the EPackage instance in the EPackage Registry
EPackage.Registry.INSTANCE.put(result.getNsURI(), result);
return result;
} catch (final SecurityException e) {
log.error(e);
return null;
} catch (final NoSuchFieldException e) {
log.error(e);
return null;
} catch (final IllegalArgumentException e) {
log.error(e);
return null;
} catch (final IllegalAccessException e) {
log.error(e);
return null;
} finally {
logPackages();
}
}
/**
* Finds an EPackage by the class name of the Package Descriptor.
* @param ePackageDescriptor The Package Descriptor's classname
* @return The EPackage instance. Returns <code>null</code> on any exception occuring while retrieval.
*/
public static EPackage getEPackageByDescriptorClassName(final String ePackageDescriptor) {
Class clazz;
try {
clazz = ResourceLoaderFactory.createResourceLoader().loadClass(ePackageDescriptor);
final EPackage.Descriptor descriptor = (EPackage.Descriptor) clazz.newInstance();
final Field f = clazz.getField("eNS_URI");
final String uri = (String) f.get(null);
EPackage.Registry.INSTANCE.put(uri, descriptor);
return EPackage.Registry.INSTANCE.getEPackage(uri);
} catch (final Exception e) {
log.error("Couldn't load ePackage '" + ePackageDescriptor, e);
return null;
} finally {
logPackages();
}
}
/**
* Creates an URI from a file name.
* @param file The file's path
* @return The URI representing the file
*/
public static URI getURI(final String file) {
// try to load the resource specified by 'file'
final URL url = ResourceLoaderFactory.createResourceLoader().getResource(file);
// if the ResourceLoader cannot locate this file create a URI from the file
if (url == null)
return URI.createURI(file);
// the ResourceLoader has successfully located the file. Return the external form of the path
return URI.createURI(url.toExternalForm());
}
}
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