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DEFINITION
XML Server Pages (XSP) is a working draft specification for an XMLbased program generation language. XSPs contain directives that control how a given XML data set is processed.
XML web publishing frameworks
The simplest way to use Cocoon is to add special processing instructions to your XML data documents. These processing instructions allow Cocoon to process and format your data and deliver it to a requesting client. Supported output formats include WML, PDF, XML, and XHTML.
Cocoon producers Producers are software components responsible for generating XML data. They are the equivalent of a servlet in that they receive and process an HttpServletRequest. This is just one of the areas in which Cocoon is extensible. You can implement your own producers to perform custom processing. Cocoon ships with a FileProducer that loads a requested file from the file system. Cocoon processors Once the data has been produced, it is available for processing. A processor is a component responsible for performing an operation such as an XSLT transformation on the XML data generated by a producer. Cocoon contains the following processors out-of-the-box:
s s s
An XSLT processor An LDAP processor An XSP processor
Writing your own processor is similar to writing a JSP custom tag. The tag is created, associated with some behavior, and included in a page.
Cocoon formatters Formatters are helper components that may be applied to a response before it is returned to the requesting client. Formatters are used to wrap output content with additional formatting information. Formatters do things such as placing tags around such markup content as HTML documents and creating a final PDF from a XSLFO formatting tree. 5.4.2 Using Cocoon to render the watch list page
Let us put Cocoon to work on our example XML document. We will use the standard Cocoon XSLT processor to perform an XSLT transformation on our quote-list XML. Fortunately for us, we already developed the XSL required to make this work in section 5.2. The only modification we need to make to the XML document returned from the application logic layer (the ListBuilder interface in the example) is to
User interface development
add a Cocoon processing instruction and references to our XSL stylesheets within the XML data document. The Cocoon directive is as follows:
< cocoon-process type=xslt >
Then we add two processing instructions that describe the HTML and WML stylesheets to be applied to the data. For the U.S. locale, the instructions are as follows:
< xml-stylesheet href=watchlist.html.en_US.xsl type=text/xsl > < xml-stylesheet href=watchlist.wml.en_US.xsl type=text/xsl media=wap >
The media=wap attribute in the second processing instruction tells Cocoon to select this stylesheet for WML -based clients. In other cases, the default stylesheet will be used. Cocoon is designed to be accessed as a servlet, but can be invoked via an API call as well. In listing 5.14, our modified WatchListServlet adds the appropriate processing instructions to the XML data document and invokes the Cocoon engine to perform the transformation and delivery back to the client.
Listing 5.14 Invoking Cocoon from the watch list servlet
import org.jdom.*; import import import import java.io.*; java.util.*; javax.servlet.*; javax.servlet.http.*;
import org.apache.cocoon.Engine; import org.apache.cocoon.util.CocoonServletRequest; public class WatchListServletWithCocoon extends HttpServlet { private ListBuilder builderInterface = new ListBuilder(); private ServletConfig config; private ServletContext context; public WatchListServletWithCocoon() { super(); } public void init(ServletConfig config) throws ServletException { this.config = config; this.context = config.getServletContext(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
XML web publishing frameworks
// get userid from HttpSession HttpSession session = request.getSession(false); if (session == null) { context.getRequestDispatcher("/login.jsp") .forward(request, response); return; } String userId = (String) session.getAttribute("userId"); Document quoteList = builderInterface.getWatchList(userId); String localeString = getLocaleString(request); String document = getOutputDocWithProcessingInstructions(quoteList, localeString);
Adds processing instructions for either locale
Obtains a handle to try { the Cocoon Engine Engine cocoonEngine = Engine.getInstance(); CocoonServletRequest myReq Wraps document = new CocoonServletRequest(document, request); as an cocoonEngine.handle(myReq, response); HttpRequest } catch (Exception e) { System.out.println("Error: " + e.getMessage()); }
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