Red Hat Web Application Framework 6.1 Manuale Utente Scaricare il pdf (Pagina 173)

Chapter 12. Presentation (Bebop) Tutorial 159

private class BannerAd extends SimpleComponent {

public void generateXML(PageState ps, Element parent) {

Element elt = new Element("socksite:bannerAd",

SOCKSITE_XML_NS);

elt.setText(BannerAdManager.getInstance().getBanner());

parent.addContent(elt);

}

You must also amend the XSLT stylesheet:

!-- match the layout element and put the

header, footer, etc., in their appropriate places. --

xsl:template match="socksite:layout"

xmlns:socksite="http://www.sockpuppet.com/xmlns"

xsl:apply-templates select="socksite:top"/

xsl:apply-templates select="socksite:bannerAd"/

table

td width="25%" xsl:apply-templates

select="socksite:side"/ /td

td xsl:apply-templates select="socksite:main"/ /td

/tr

/table

xsl:apply-templates select="bebop:bottom"/

/xsl:template

Note

The above stylesheet will work whether or not the input DOM actually contains a banner ad; the

xsl:apply-templates select="socksite:bannerAd"/ code will simply be ignored if no such

element exists in the DOM.

12.5. Special-Case Stylesheets

You may occasionally want to override the default stylesheet rules for one particular page. Because of

the way XSLT works, you can choose to override only some template match=... rules, allowing

others to be handled by the default stylesheet.

You should handle this in the dispatcher for your application, or by overriding the getStylesheet-

Transformer() or servePage methods in a PresentationManager class speciﬁc to your appli-

cation. For example:

public class SockPuppetPresentationManager extends

BasePresentationManager {

public void servePage(Page p,

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Red Hat Web Application Framework 6.1 Manuale Utente Pagina 173