--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/buildframework/helium/sf/java/metadata/src/com/nokia/helium/metadata/DAO.java	Fri Aug 13 14:59:05 2010 +0300
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved.
+ * This component and the accompanying materials are made available
+ * under the terms of the License "Eclipse Public License v1.0"
+ * which accompanies this distribution, and is available
+ * at the URL "http://www.eclipse.org/legal/epl-v10.html".
+ *
+ * Initial Contributors:
+ * Nokia Corporation - initial contribution.
+ *
+ * Contributors:
+ *
+ * Description:  
+ *
+ */
+package com.nokia.helium.metadata;
+
+import java.io.Serializable;
+import java.util.List;
+
+/**
+ * Interface to implement the Data Access Object pattern. 
+ *
+ * @param <T> the type of the object to persist.
+ */
+public interface DAO<T> {
+    
+    /**
+     * Find a particular T object based on it's id. 
+     * @param id the id to look for.
+     * @return the retrieved object, or null if not found.
+     */
+    T findById(Serializable id);
+    
+    /**
+     * Finding all rows from the database.
+     * @return the list of T objects.
+     */
+    List<T> findAll();
+    
+    /**
+     * Persisting the data object from the database. 
+     * @param data the object to persist
+     */
+    void persist(T data);
+
+    /**
+     * Removing the data object from the database.
+     * @param data the row to be removed
+     */
+    void remove(T data);
+}