Bigger warnings that new users should use SXSSF, and not mess around with the XML themselves

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1696019 13f79535-47bb-0310-9956-ffa450edef68

src/examples/src/org/apache/poi/xssf/usermodel/examples/BigGridDemo.java

@@ -32,19 +32,28 @@ import org.apache.poi.xssf.usermodel.*;
 /**
  * Demonstrates a workaround you can use to generate large workbooks and avoid OutOfMemory exception.
  *
- * The trick is as follows:
+ * Note - You probably <em>don't want to use this approach any more</em>! POI
+ *  now includes the SXSSF which handles all of this for you, you should
+ *  be using that instead! This code remains mostly for historical interest.
+ * <p>
+ * See <a "http://poi.apache.org/spreadsheet/how-to.html#sxssf">
+ *     http://poi.apache.org/spreadsheet/how-to.html#sxssf</a>.
+ * <p>
+ * If you really want to use this approach, which is also the one that SXSSF
+ * does for you, it works as follows:
+ * 
  * 1. create a template workbook, create sheets and global objects such as cell styles, number formats, etc.
  * 2. create an application that streams data in a text file
  * 3. Substitute the sheet in the template with the generated data
  *
  * <p>
- *      Since 3.8-beta3 POI provides a low-memory footprint SXSSF API which implementing the "BigGridDemo" strategy.
+ *  Since 3.8 POI provides a low-memory footprint SXSSF API, which implements 
- *      XSSF is an API-compatible streaming extension of XSSF to be used when
+ *  ths "BigGridDemo" strategy. SXSSF is an API-compatible streaming extension
- *      very large spreadsheets have to be produced, and heap space is limited.
+ *  of XSSF to be used when very large spreadsheets have to be produced, and 
- *      SXSSF achieves its low memory footprint by limiting access to the rows that
+ *  heap space is limited. SXSSF achieves its low memory footprint by limiting 
- *      are within a sliding window, while XSSF gives access to all rows in the
+ *  access to the rows that are within a sliding window, while XSSF gives access 
- *      document. Older rows that are no longer in the window become inaccessible,
+ *  to all rows in the document. Older rows that are no longer in the window 
- *      as they are written to the disk.
+ *  become inaccessible, as they are written to the disk.
  * </p>
  * See <a "http://poi.apache.org/spreadsheet/how-to.html#sxssf">
  *     http://poi.apache.org/spreadsheet/how-to.html#sxssf</a>.