Implements method that allow return ChatHistory in Agent call (#979)

Author: iroqueta

common/src/main/java/com/genexus/GXExternalCollection.java

@@ -99,6 +99,7 @@ public Vector getStruct()
 		return struct;
 	}
 
+	@SuppressWarnings("unchecked")
 	public ArrayList getExternalInstance() {
 		ArrayList list = new ArrayList();
 		for (T Item : this)
@@ -115,5 +116,23 @@ public ArrayList getExternalInstance() {
 		return list;
 	}
 
+	@SuppressWarnings("unchecked")
+	public void setExternalInstance(ArrayList<?> data)
+	{
+		try {
+			clear();
+			for (Object item : data) {
+				T obj = elementsType.getConstructor(new Class[]{}).newInstance();
+				obj.getClass().getMethod("setExternalInstance", item.getClass()).invoke(obj, item);
+				super.add(obj);
+				vectorExternal.add(item);
+			}
+		}
+		catch(Exception ex)
+		{
+			ex.printStackTrace();
+		}
+	}
+
 }