1 files changed, 97 insertions, 0 deletions
diff --git a/java/broker/src/main/java/org/apache/qpid/server/model/Model.java b/java/broker/src/main/java/org/apache/qpid/server/model/Model.java
new file mode 100644
index 0000000000..fd429321c8
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+++ b/java/broker/src/main/java/org/apache/qpid/server/model/Model.java
@@ -0,0 +1,97 @@
+/*
+ *
+ * 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.qpid.server.model;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Model
+{
+    private static final Map<Class<? extends ConfiguredObject>, Collection<Class<? extends ConfiguredObject>>>
+            PARENTS = new HashMap<Class<? extends ConfiguredObject>, Collection<Class<? extends ConfiguredObject>>>();
+
+
+    private static final Map<Class<? extends ConfiguredObject>, Collection<Class<? extends ConfiguredObject>>>
+            CHILDREN = new HashMap<Class<? extends ConfiguredObject>, Collection<Class<? extends ConfiguredObject>>>();
+
+    static void addRelationship(Class<? extends ConfiguredObject> parent, Class<? extends ConfiguredObject> child)
+    {
+        Collection<Class<? extends ConfiguredObject>> parents = PARENTS.get(child);
+        if(parents == null)
+        {
+            parents = new ArrayList<Class<? extends ConfiguredObject>>();
+            PARENTS.put(child, parents);
+        }
+        parents.add(parent);
+
+        Collection<Class<? extends ConfiguredObject>> children = CHILDREN.get(parent);
+        if(children == null)
+        {
+            children = new ArrayList<Class<? extends ConfiguredObject>>();
+            CHILDREN.put(parent, children);
+        }
+        children.add(child);
+    }
+
+    static
+    {
+        addRelationship(Broker.class, VirtualHost.class);
+        addRelationship(Broker.class, Port.class);
+        addRelationship(Broker.class, AuthenticationProvider.class);
+
+        addRelationship(VirtualHost.class, Exchange.class);
+        addRelationship(VirtualHost.class, Queue.class);
+        addRelationship(VirtualHost.class, Connection.class);
+        addRelationship(VirtualHost.class, VirtualHostAlias.class);
+
+        addRelationship(AuthenticationProvider.class, User.class);
+
+        addRelationship(Connection.class, Session.class);
+
+        addRelationship(Exchange.class, Binding.class);
+        addRelationship(Exchange.class, Publisher.class);
+
+        addRelationship(Queue.class, Binding.class);
+        addRelationship(Queue.class, Consumer.class);
+
+        addRelationship(Session.class, Consumer.class);
+        addRelationship(Session.class, Publisher.class);
+
+    }
+
+    public static Collection<Class<? extends ConfiguredObject>> getParentTypes(Class<? extends ConfiguredObject> child)
+    {
+        Collection<Class<? extends ConfiguredObject>> parentTypes = PARENTS.get(child);
+        return parentTypes == null ? Collections.EMPTY_LIST
+                                   : Collections.unmodifiableCollection(parentTypes);
+    }
+
+    public static Collection<Class<? extends ConfiguredObject>> getChildTypes(Class<? extends ConfiguredObject> parent)
+    {
+        Collection<Class<? extends ConfiguredObject>> childTypes = CHILDREN.get(parent);
+        return childTypes == null ? Collections.EMPTY_LIST
+                                  : Collections.unmodifiableCollection(childTypes);
+    }
+}