--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mde/mergetag/DataSet.d	Fri Mar 07 17:51:02 2008 +0000
@@ -0,0 +1,56 @@
+/** This module contains the mergetag DataSet class, used for all reading and writing operations.
+ */
+module mde.mergetag.DataSet;
+
+// package imports
+public import mde.mergetag.iface.IDataSection;
+import mde.mergetag.DefaultData;
+import mde.mergetag.exception;
+
+
+/**************************************************************************************************
+ * Data class; contains a DataSection class instance for each loaded section of a file.
+ *
+ * Stored data is available for direct access via header and sec; all functions are just helper
+ * functions.
+ *
+ * Any class implementing IDataSection may be used to store data; by default a DefaultData class is
+ * used when reading a file. Another class may be used by creating the sections before reading the
+ * file or passing the reader a function to create the sections (see Reader.dataSecCreator).
+ *
+ * Could be a struct, except that structs are value types (not reference types).
+ */
+class DataSet
+{
+    DefaultData header;			/// Header section.
+    IDataSection[ID] sec;		/// Dynamic array of sections
+    
+    /// Template to return all sections of a child-class type.
+    T[ID] getSections (T : IDataSection) () {
+        T[ID] ret;
+        foreach (ID id, IDataSection s; sec) {
+            T x = cast(T) s;
+            if (x) ret[id] = x;	// if non-null
+        }
+        return ret;
+    }
+}
+
+debug (mdeUnitTest) {
+    import tango.util.log.Log : Log, Logger;
+
+    private Logger logger;
+    static this() {
+        logger = Log.getLogger ("mde.mergetag.DataSet");
+    }
+    
+    unittest {	// Only covers DataSet really.
+        DataSet ds = new DataSet;
+        ds.sec[cast(ID)"test"] = new DefaultData;
+        assert (ds.getSections!(DefaultData)().length == 1);
+        ds.sec[cast(ID)"test"].addTag ("int",cast(ID)"T"," -543 ");
+        assert (ds.getSections!(DefaultData)()[cast(ID)"test"]._int[cast(ID)"T"] == -543);
+    
+        logger.info ("Unittest complete.");
+    }
+}