From: "Paul Michael Reilly" <[EMAIL PROTECTED]>
> Now that I've got Jelly built from source I'm ready to contribute by
> helping to find bugs. The original post in this thread dealt with
> defining custom tags. I suspected, wrongly, that using the CVS
> sources would enable the following to work:
>
> Script:
> ...
> <?xml version="1.0"?>
> <j:jelly xmlns:j="jelly:core"
> xmlns:log="jelly:log"
> xmlns:dcc="psg.dcc.jelly.DCCTagLibrary">
>
> <dcc:test>
> <log:info>Testing custom jelly tags</log:info>
> </dcc:test>
>
> <dcc:notdefined>
> <log:info>Why does this print?</log:info>
> </dcc:notdefined>
>
> </j:jelly>
>
> Tag library source:
> ...
> package psg.dcc.jelly;
>
> import org.apache.commons.jelly.TagLibrary;
> import psg.dcc.jelly.tags.swing.FileChooserTag;
> import psg.dcc.jelly.tags.ui.ShowPageTag;
> import psg.dcc.jelly.tags.TestTag;
>
> /**
> * A Jelly custom tag library that supports DCC.
> *
> * @author <a href="mailto:pmr@;pajato.com">Paul Reilly</a>
> * @version $Revision: 1.0 $
> */
> public class DCCTagLibrary extends TagLibrary {
>
> public DCCTagLibrary() {
> registerTag( "fileChooser", FileChooserTag.class );
> registerTag( "showPage", ShowPageTag.class );
> registerTag( "test", TestTag.class );
> }
> }
>
> Tag source:
> ...
> package psg.dcc.jelly.tags;
>
> import org.apache.commons.jelly.XMLOutput;
> import org.apache.commons.jelly.TagSupport;
>
> import org.apache.commons.logging.Log;
> import org.apache.commons.logging.LogFactory;
>
>
> /**
> * Test custom tag creation.
> *
> * @author <a href="mailto:pmr@;pajato.com">Paul Reilly</a>
> * @version $Revision: 1.0 $
> */
> public class TestTag extends TagSupport {
>
> /** The Log to which logging calls will be made. */
> private static final Log log = LogFactory.getLog(TestTag.class);
>
> public TestTag() {
>
> System.out.println( "Constructed the test tag." );
> }
>
> private XMLOutput output;
>
> // Tag interface
>
//-------------------------------------------------------------------------
> public void doTag(XMLOutput output) throws Exception {
>
> this.output = output;
>
> System.out.println( "testing, testing" );
> }
>
> }
>
> Results:
> ...
> resources:
>
> run:
> Nov 5, 2002 10:54:00 AM org.apache.commons.jelly.tags.log.InfoTag doTag
> INFO: Testing custom jelly tags
> Nov 5, 2002 10:54:00 AM org.apache.commons.jelly.tags.log.InfoTag doTag
> INFO: Why does this print?
>
> BUILD SUCCESSFUL
> Total time: 11 seconds
>
>
> I invoke the script from a Java application. There are two issues:
>
> 1) Why do the print statements in the tag implementation not get
> output?
Because its not even invoking your custom tag library. Though you almost did
everything totally right. You need to prefix your namespace URI with
'jelly:' to get Jelly to automatically detect your new tag library. So just
to change your namespace definition in the Jelly script to the following
(notice the use of 'jelly:' as a prefix)...
xmlns:dcc="jelly:psg.dcc.jelly.DCCTagLibrary"
which should then use your tag library
Another way around the problem is to create a JellyContext and register your
TagLibrary class with a specific namespace URI before running your script;
then your tag library can be bound to any namespace URI you like.
> 2) Shouldn't the <notdefined> tag generate an undefined tag error?
Default behaviour is to treat all XML elements that are not bound to a Tag
as just static XML. Though your TagLibrary could throw an exception if an
unknown tag name is used if it wished
James
-------
http://radio.weblogs.com/0112098/
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