1 files changed, 72 insertions, 0 deletions
diff --git a/sdo-java/branches/emf-2.5/impl/src/main/java/org/apache/tuscany/sdo/helper/DefaultHelperContextImpl.java b/sdo-java/branches/emf-2.5/impl/src/main/java/org/apache/tuscany/sdo/helper/DefaultHelperContextImpl.java
new file mode 100644
index 0000000000..f7ac22632a
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+++ b/sdo-java/branches/emf-2.5/impl/src/main/java/org/apache/tuscany/sdo/helper/DefaultHelperContextImpl.java
@@ -0,0 +1,72 @@
+/**
+ *
+ *  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);
+        }
+    }
+}