1 files changed, 70 insertions, 0 deletions
diff --git a/sdo-java/trunk/lib/src/main/java/org/apache/tuscany/sdo/lib/UnknownPropertyList.java b/sdo-java/trunk/lib/src/main/java/org/apache/tuscany/sdo/lib/UnknownPropertyList.java
new file mode 100644
index 0000000000..95eabd4b82
--- /dev/null
+++ b/sdo-java/trunk/lib/src/main/java/org/apache/tuscany/sdo/lib/UnknownPropertyList.java
@@ -0,0 +1,70 @@
+/**
+ *
+ *  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.lib;
+
+import java.util.AbstractList;
+import java.util.Collections;
+import java.util.List;
+
+import commonj.sdo.DataObject;
+
+public class UnknownPropertyList extends AbstractList {
+    protected List delegateList = Collections.EMPTY_LIST;
+    protected DataObject dataObject;
+    protected String path;
+
+    public UnknownPropertyList(DataObject dataObject, String path) {
+        this.dataObject = dataObject;
+        this.path = path;
+    }
+
+    public Object get(int index) {
+        return getDelegateList().get(index);
+    }
+
+    public int size() {
+    	return getDelegateList().size();
+    }
+
+    public Object remove(int index) {
+        return getDelegateList().remove(index);
+    }
+    public Object set(int index, Object element) {
+        return getDelegateList().set(index, element);
+    }
+
+    public void add(int index, Object element) {
+        if (getDelegateList() == Collections.EMPTY_LIST && index == 0) {
+            dataObject.set(path, Collections.singletonList(element));
+            delegateList = (List)dataObject.get(path);
+        }
+        else {        
+        	delegateList.add(index, element);
+        }
+    }
+    
+    protected List getDelegateList() {
+        if (delegateList == Collections.EMPTY_LIST) {
+            List propertyList = (List)dataObject.get(path);
+            if (propertyList != null) delegateList = propertyList;
+        }
+        return delegateList;
+    }
+}