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/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sdo.helper;
import java.util.Map;
import java.util.WeakHashMap;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.impl.EPackageRegistryImpl;
public class DefaultHelperContextImpl extends HelperContextImpl {
public DefaultHelperContextImpl(final boolean extensibleNamespaces) {
super(new SDOExtendedMetaDataImpl(new SDOPackageRegistryDelegator()), extensibleNamespaces);
}
public DefaultHelperContextImpl(final boolean extensibleNamespaces, final Map options) {
super(new SDOExtendedMetaDataImpl(new SDOPackageRegistryDelegator()), extensibleNamespaces, options);
}
protected static class SDOPackageRegistryDelegator extends EPackageRegistryImpl.Delegator {
/**
* A map from class loader to its associated registry.
*/
protected Map classLoaderToRegistryMap = new WeakHashMap();
/**
* Returns the package registry associated with the given class loader.
* @param classLoader the class loader.
* @return the package registry associated with the given class loader.
*/
public synchronized EPackage.Registry getRegistry(final ClassLoader classLoader)
{
EPackage.Registry result = (EPackage.Registry)classLoaderToRegistryMap.get(classLoader);
if (result == null)
{
if (classLoader == null)
{
result = HelperContextImpl.getBuiltInModelRegistry();
}
else
{
result = new EPackageRegistryImpl(getRegistry(classLoader.getParent()));
classLoaderToRegistryMap.put(classLoader, result);
}
}
return result;
}
protected EPackage.Registry delegateRegistry(final ClassLoader classLoader)
{
return getRegistry(classLoader);
}
}
}
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