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--- about:navigating_principle_languages [2013-09-14 15:47] – judgment christian
+++ about:navigating_principle_languages [2013-09-14 15:55] – code DataImpl christian
@@ Line 43: / Line 43: @@
   * For the data layer there is a data component, a class ''DataImpl'' which aggregates three subcomponents ''Enterprise'', ''Persistence'', and ''Store'' and gives access to them.
-FIXME code for Data class
+<code java>
+public class DataImpl implements DataIf
+{
+    public EnterpriseQueryIf getEnterpriseQueryIf()
+    {
+        return new EnterpriseQueryImpl();
+    }
+    public PersistenceIf getPersistenceManager()
+    {
+        return new PersistenceImpl();
+    }
+    public StoreQueryIf getStoreQueryIf()
+    {
+        return new StoreQueryImpl();
+    }
+}
+</code>
   * There are "factory" classes which lazily create and provide access to single instances of a component.
@@ Line 53: / Line 71: @@
     private static DataIf dataaccess = null;
-    private DataIfFactory () {}
+    private DataIfFactory() {}
-    public static DataIf getInstance ()
+    public static DataIf getInstance()
     {
         if (dataaccess == null)
         {
-            dataaccess = new DataImpl ();
+            dataaccess = new DataImpl();
         }
         return dataaccess;