diff -N GenericObject.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ GenericObject.java	8 Aug 2005 07:16:19 -0000	1.1
@@ -0,0 +1,55 @@

+package org.lcsim.event;
+
+/** Simple interface to store generic user data.
+ * To store your own classes they have to implement
+ * this interface.
+ *
+ */
+
+public interface GenericObject
+{
+    
+    /** Number of integer values stored in this object.
+     */
+    public int getNInt();
+    
+    /** Number of float values stored in this object.
+     */
+    public int getNFloat();
+    
+    /** Number of double values stored in this object.
+     */
+    public int getNDouble();
+    
+    /** Returns the integer value for the given index.
+     */
+    public int getIntVal(int index);
+    
+    /** Returns the float value for the given index.
+     */
+    public float getFloatVal(int index);
+    
+    /** Returns the double value for the given index.
+     */
+    public double getDoubleVal(int index);
+    
+    /** True if objects of the implementation class have a fixed size, i.e
+     * getNInt, getNFloat and getNDouble will return values that are constant during
+     * the lifetime of the object.
+     */
+    public boolean isFixedSize();
+    
+    /** The type name of the user class (typically the class name)
+     * This type name is stored as a collection parameter "TypeName"
+     * with every collection of LCGenericObject subclasses.<br>
+     *
+     */
+    public String getTypeName();
+    
+    /** The description string. A comma separated list of pairs of
+     *  type identifier, one of 'i','f','d' followed by ':'
+     *  and an attribute name, e.g. "i:cellId,f:offset,f:gain".
+     */
+    public String getDataDescription();
+} // class or interface
+