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chart may display a legend if needed. The tooltips on the chart are optional, as is URL generation. Both tooltips and URLs are used for HTML image maps, if the chart is clickable in a web browser. JFreeChart can also use the OverLIB (www.bosrup.com/ web/overlib/) JavaScript library to generate tooltips for web images. You will need to include the JavaScript source file overlib.js in your portlet application output.

In our example, the top-level element is <Employee>. This top-level element name is decided by the first real column in the SELECT list (in our case, EmployeeID). The top-level element name is picked up from the first piece of metadata information specified after the EmployeeID column. We want to output the EmployeeID column value as an attribute named EmpID. Thus the parent level of the EmpID attribute is tag 1. Finally, the third piece of metadata information specifies that the attribute name is EmpID. The metadata for the FirstName and LastName columns specifies that their parent is the level 1 element and they are to be outputted as <FirstName> and <LastName> elements, respectively. The second SELECT query is shown in Listing 10-10. Listing 10-10. Fetching the Data for the Structure Defined in the Previous Query SELECT 1, NULL, EmployeeID, FirstName, LastName FROM Employees ORDER BY [Employee!1!EmpID], [Employee!1!FirstName!element], [Employee!1!LastName!element] FOR XML EXPLICIT The query selects data for tag 1 and selects the EmployeeID, FirstName, and LastName columns. The ORDER BY clause indicates the sequence in which the elements will appear in the resultant XML. Finally, the query adds a FOR XML EXPLICIT clause. Now that you understand both queries, you can use the UNION ALL clause as shown in Listing 10-11. Listing 10-11. Using the UNION ALL Clause SELECT 1 AS Tag, NULL AS Parent, EmployeeID AS [Employee!1!EmpID], FirstName AS [Employee!1!FirstName!element], LastName AS [Employee!1!LastName!element] FROM Employees UNION All SELECT 1,NULL, EmployeeID, FirstName, LastName FROM Employees ORDER BY [Employee!1!EmpID],

The 3D bar chart requires an org.jfree.data.CategoryDataset object as its data source. The CategoryDataset class is an interface. We use the concrete implementation org.jfree.data.DefaultCategoryDataset class to hold our data. For our purposes, the only method we need to use on the data set class is addValue(double value, Comparable rowKey, comparable columnKey). This method adds our numerical value to the data set, with the row key 2004 and the column key January , February , or March . The row and column keys refer to the data set s structure, not necessarily the way the chart is rendered. If we use more than one row key in a bar chart data set, we will get multiple bars for each category value. Each bar will have a different color. We could use this for a chart that visualizes monthly rainfall in different years, although other chart types (such as a line chart) would probably be better.

To maintain application scalability, the server sends the results of the page rendering to the client, and in its memory, cleans up everything for a particular session. The server now forgets about the page, and control is returned to the browser. Information that is necessary for the server to remember the page again at the next session is stored in view state, and the page is initialized with this information on the next postback.

In our example, we export the chart to a PNG image file on our file system. The chart s filename is barchart3d.png, and will be created in the working directory for this Java application. The PNG image should load in most modern web browsers and image manipulation tools. The org.jfree.chart.ChartUtilities class provides methods for saving charts as JPEG or PNG images, writing JPEG or PNG to an input stream, and working with image maps: