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RE: Servlet setup question

From: Laird, Brian <BLaird@perseco.com>
Date: Thu, 3 Mar 2005 12:17:48 -0600
Message-ID: <198C7B6593B76E44B30C3AAC456E57A105952B@electra.Perseco.com>
To: "Yves Lafon" <ylafon@w3.org>
Cc: <www-jigsaw@w3.org>

Yves,

I got it working but I would say it is an ugly yet workable solution.  Here is what I did:

- turned checkSensitivity off
- created a class that extends DirectoryResource (see below)
- created a new resource using this instead of DirectoryResource
- Added the ServletDirectoryFrame underneath it to have a proper servlet context  

package jigsaw.extenstions;
import org.w3c.jigsaw.resources.DirectoryResource;
public class MyDirectory extends DirectoryResource
{

	protected int getMatchingCharsCount(String s1, String s2)
	{
		if (s1 == null || s2 == null || s1.length() == 0 || s2.length() == 0)
		{
			return -1;
		}
		if (s1.endsWith(s2))
		{
			return 1;
		}
		return super.getMatchingCharsCount(s1, s2);
	}
}

The getMatchingCharsCount is from the ContainerResource class which is called when check sensitivity is turned off and the container can't find the resource any other way.  I am assuming this was intended to handle things capitalization problems (ex: index.html vs. Index.html).  It is a simple implementation, but it was really difficult to come to this solution.  

What I don't understand is that in the servlet spec you can do something like this:

servletA can be defined to listen on anything *.extension.

I would think that Jigsaw should be able to handle this using the extensions, but I was never able to get it work because there wasn't a physical file that corresponded unless I made one which doesn't make sense for me.  Is this something that can be added to the existing indexers or would this be a whole new indexer?

Hope this helps...

Brian

-----Original Message-----
From: Laird, Brian 
Sent: Wednesday, March 02, 2005 11:01 AM
To: 'Yves Lafon'
Cc: www-jigsaw@w3.org
Subject: RE: Servlet setup question

Yves,

I am still struggling with this one.  I build a custom resource which just extends the ServletWrapper.  Since I am using JDK 1.4 I decided it would use regular expressions.  Here is the code:

package org.w3c.jigsaw.servlet;

import org.w3c.tools.resources.LookupResult;
import org.w3c.tools.resources.LookupState;
import org.w3c.tools.resources.ProtocolException;


public class PersecoFrameworkServletWrapper extends ServletWrapper
{
	public boolean lookup(LookupState ls, LookupResult lr) throws ProtocolException
	{
		if (ls.getURI() != null && ls.getURI().matches(getIdentifier()))
		{
			lr.setTarget(getResourceReference());
			return true;
		}
		return super.lookup(ls, lr);
	}
}

Then I defined a DirectoryResource with a ServletDirectoryFrame underneath it.  Then I added a resource under that directory with the identifier of *.flow and pointed it to the class above.  In stepping through the code it just never seems to get my class.  I always get a 404 back from the server.  Can you let me know what I am doing wrong on this?  I should be extending the ServletWrapperFrame instead?

Thanks,
Brian

-----Original Message-----
From: Yves Lafon [mailto:ylafon@w3.org] 
Sent: Wednesday, February 23, 2005 4:25 AM
To: Laird, Brian
Cc: www-jigsaw@w3.org
Subject: Re: Servlet setup question


On Tue, 22 Feb 2005, Laird, Brian wrote:

> How do I configure a servlet in Jigsaw to listen on a specific
> extension?  This extension will not be mapped to any physical file on
> the disk.  My example is that I want to have a servlet listen in a
> specific directory for anything with .flow at the end.  Is this possible
> and how would I go about doing it?  In that same directory, I will
> probably have some images and static files.

It is easy to do in the Jigsaw framework, but I don't know how to do that 
with servlets.
The way to do this in Jigsaw is to overload the "lookup" method of a 
resource or a frame.

If your .flow are linked to existing files, the ServletMapperFrame on top 
of a FileResource is the way to go (much like jsp, it delegates everything 
to a servlet with the path of the .jsp given to the servlet, see [1])
It might work without any physical file on the disk if you replace the 
FileResource by a FramedResource which is only virtual.
Thanks,

[1] http://www.w3.org/Jigsaw/Doc/User/jsp.html


  >
>
>
> Thanks in advance,
>
> Brian
>
>
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-- 
Yves Lafon - W3C
"Baroula que barouleras, au tiéu toujou t'entourneras."

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Received on Thursday, 3 March 2005 18:20:03 GMT

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