Thanks! I ask you more when I am stuck.
Billy Ng
----- Original Message -----
From: "Eddie Bush" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Saturday, September 21, 2002 9:50 AM
Subject: Re: preserve Forward order
> Here's what I would do:
> - grab source from CVS
> - located the source for ValidatorPlugin.java (or is it
> ValidatorPlugIn.java?)
> - read up on the javadoc for the Plugin interface.
>
> (You could just browse CVS over the web and find that file to examine,
> if you prefer. I find having the full source handy for consultation is
> a big help at times though.)
>
> It's *really* simple. I think the most difficult part will be figuring
> out the digester and what you want your graph to look like. Be sure you
> look at the digester package javadocs: org.apache.commons.digester (I
> believe). There's quite a long explaination of how to use the digester.
> If you get stuck, I can possibly give you a pointer or two. I haven't
> used it long, but I manage to get it to build heirarchys just fine
> (create this, set it's properties, add it to this other object ...)
>
> A skelleton plugin might be:
>
> -------------------------------------------------- BEGIN MyPlugin
> import org.apache.struts.action.PlugIn;
> import org.apache.struts.action.ActionServlet;
> import org.apache.struts.config.ApplicationConfig;
>
> import org.apache.commons.logging.Log;
> import org.apache.commons.logging.LogFactory;
>
> import org.apache.commons.digester.Digester;
> import org.xml.sax.SAXException;
>
> import javax.servlet.ServletException;
> import javax.servlet.UnavailableException;
> import java.io.IOException;
>
> import java.util.Collection;
> import java.util.ArrayList;
>
> public class MyPlugin implements PlugIn
> {
> private Log log = LogFactory.getLog(MyPlugin.class);
> private ActionServlet servlet = null;
> private ApplicationConfig config = null;
>
> private String configFile;
>
> public MyPlugin()
> {
> }
>
> public void destroy()
> {
> this.servlet = null;
> this.config = null;
> }
>
> public void init(ActionServlet servlet, ApplicationConfig config)
> throws ServletException
> {
> if (log.isTraceEnabled())
> log.trace("Initializing module configuration");
>
> this.servlet = servlet;
> this.config = config;
>
> Digester digester = new Digester();
>
> ...
>
> java.io.InputStream is =
> servlet.getServletContext().getResourceAsStream(configFile);
>
> try
> {
> digester.push(...);
> digester.parse(is);
> is.close();
> }
> catch (IOException ioe)
> {
> log.fatal("IOException thrown while parsing config: " +
> ioe.getMessage(), ioe);
> throw new UnavailableException("IOException thrown while parsing
> modules config");
> }
> catch (SAXException saxe)
> {
> log.fatal("SAXException thrown while parsing config: " +
> saxe.getMessage(), saxe);
> throw new UnavailableException("SAXException thrown while parsing
> config");
> }
>
> ...
>
> servlet.getServletContext().setAttribute("myTopLevelBean",
> myTopLevelBean);
>
> if (log.isTraceEnabled())
> log.trace("Finished initializing module configuration");
> }
>
> public java.lang.String getConfigFile()
> {
> return configFile;
> }
>
> public void setConfigFile(java.lang.String configFile)
> {
> if (log.isTraceEnabled())
> log.trace("Setting configFile to " + configFile);
>
> this.configFile = configFile;
> }
>
> }
> -------------------------------------------------- END MyPlugin
>
>
> Billy Ng wrote:
>
> >Good idea! I won't go for hacking Struts either. By the way, I heard
you
> >guys talking about plugin so many times (I know, I am a slower learner).
> >Any web site I can look at. I am very interested in learnig it.
> >
> >Billy Ng
> >
>
> --
> Eddie Bush
>
>
>
>
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