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/**
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.common.model;
import org.eclipse.emf.cdo.common.model.CDOPackageUnit.Type;
import org.eclipse.net4j.util.ObjectUtil;
import org.eclipse.net4j.util.om.OMPlatform;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.impl.EPackageImpl;
import org.eclipse.emf.ecore.plugin.EcorePlugin;
import org.eclipse.emf.ecore.util.EcoreUtil;
import java.util.HashMap;
import java.util.Map;
/**
* A {@link #INSTANCE singleton} registry for the {@link Type package unit types} of EMF {@link EPackage packages}.
*
* @author Eike Stepper
* @since 2.0
*/
public final class CDOPackageTypeRegistry
{
public static final CDOPackageTypeRegistry INSTANCE = new CDOPackageTypeRegistry();
private static final String ECORE_ID = "org.eclipse.emf.ecore"; //$NON-NLS-1$
private static final String PPID = EcorePlugin.GENERATED_PACKAGE_PPID;
private static final String MARKER_FILE = "META-INF/CDO.MF"; //$NON-NLS-1$
private Map<String, CDOPackageUnit.Type> types = new HashMap<String, CDOPackageUnit.Type>();
private Map<String, CDOPackageUnit.Type> bundles = new HashMap<String, CDOPackageUnit.Type>();
private CDOPackageTypeRegistry()
{
}
public synchronized CDOPackageUnit.Type register(EPackage ePackage)
{
CDOPackageUnit.Type type = getPackageType(ePackage);
types.put(ePackage.getNsURI(), type);
return type;
}
public synchronized void registerNative(String packageURI)
{
types.put(packageURI, CDOPackageUnit.Type.NATIVE);
}
public synchronized void registerLegacy(String packageURI)
{
types.put(packageURI, CDOPackageUnit.Type.LEGACY);
}
public synchronized void registerDynamic(String packageURI)
{
types.put(packageURI, CDOPackageUnit.Type.DYNAMIC);
}
public synchronized CDOPackageUnit.Type deregister(String packageURI)
{
return types.remove(packageURI);
}
public synchronized CDOPackageUnit.Type lookup(String packageURI)
{
CDOPackageUnit.Type type = types.get(packageURI);
if (type == null)
{
Object value = EPackage.Registry.INSTANCE.get(packageURI);
if (value instanceof EPackage)
{
EPackage ePackage = (EPackage)value;
type = register(ePackage);
}
if (type == null && OMPlatform.INSTANCE.isExtensionRegistryAvailable())
{
type = getTypeFromBundle(packageURI);
types.put(packageURI, type);
}
}
return type;
}
public synchronized CDOPackageUnit.Type lookup(EPackage ePackage)
{
String packageURI = ePackage.getNsURI();
CDOPackageUnit.Type type = types.get(packageURI);
if (type == null)
{
type = register(ePackage);
}
return type;
}
public synchronized void reset()
{
types.clear();
bundles.clear();
}
private CDOPackageUnit.Type getTypeFromBundle(String packageURI)
{
String bundleID = getBundleID(packageURI);
if (bundleID == null)
{
return CDOPackageUnit.Type.UNKNOWN;
}
CDOPackageUnit.Type type = bundles.get(bundleID);
if (type == null)
{
org.osgi.framework.Bundle bundle = org.eclipse.core.runtime.Platform.getBundle(bundleID);
if (bundle == null)
{
type = CDOPackageUnit.Type.UNKNOWN;
}
else if (bundle.getEntry(MARKER_FILE) != null)
{
type = CDOPackageUnit.Type.NATIVE;
}
else
{
type = CDOPackageUnit.Type.LEGACY;
}
bundles.put(bundleID, type);
}
return type;
}
private static String getBundleID(String packageURI)
{
org.eclipse.core.runtime.IExtensionRegistry registry = org.eclipse.core.runtime.Platform.getExtensionRegistry();
for (org.eclipse.core.runtime.IConfigurationElement element : registry.getConfigurationElementsFor(ECORE_ID, PPID))
{
String uri = element.getAttribute("uri"); //$NON-NLS-1$
if (ObjectUtil.equals(uri, packageURI))
{
return element.getContributor().getName();
}
}
return null;
}
private static CDOPackageUnit.Type getPackageType(EPackage ePackage)
{
if (ePackage.getClass() == EPackageImpl.class)
{
return CDOPackageUnit.Type.DYNAMIC;
}
EPackage topLevelPackage = EMFUtil.getTopLevelPackage(ePackage);
EClass eClass = getAnyConcreteEClass(topLevelPackage);
if (eClass != null)
{
EObject testObject = EcoreUtil.create(eClass);
if (testObject instanceof CDOObjectMarker)
{
return CDOPackageUnit.Type.NATIVE;
}
return CDOPackageUnit.Type.LEGACY;
}
return null;
}
private static EClass getAnyConcreteEClass(EPackage ePackage)
{
for (EClassifier classifier : ePackage.getEClassifiers())
{
if (classifier instanceof EClass)
{
EClass eClass = (EClass)classifier;
if (!(eClass.isAbstract() || eClass.isInterface()))
{
return eClass;
}
}
}
for (EPackage subpackage : ePackage.getESubpackages())
{
EClass eClass = getAnyConcreteEClass(subpackage);
if (eClass != null)
{
return eClass;
}
}
return null;
}
/**
* A common marker interface for CDO (native) objects.
*
* @author Eike Stepper
* @noextend This interface is not intended to be extended by clients.
* @noimplement This interface is not intended to be implemented by clients.
*/
public static interface CDOObjectMarker
{
}
}
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