Implementing FileExistSelector

[Michael Homeijer <M....@devote.nl>]

In a part of the sitemap I want to check if a requested file exists,
if it doesn't i want to return the contents of a default file.

Is this the way I should implement something like that
or are the easier methods? :

<map:match pattern="annotation\*"
  <map:select type="fileexists">
     <map:parameter name="filename" value="annotation\{1}"/>

     <map:when test="fileexists">
          <map:generate src="annotation\{1}"/>
     </map:when>
     <map:otherwise>
         <map:generate src="annotation\default.xml"/>
      </map:otherwise>
  </map:select>
  <map:transform src="annotation.xsl"/>
</map:match>

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Re: Implementing FileExistSelector

[Giacomo Pati <gi...@apache.org>]

Quoting Michael Homeijer <M....@devote.nl>:

> In a part of the sitemap I want to check if a requested file exists,
> if it doesn't i want to return the contents of a default file.
> 
> Is this the way I should implement something like that
> or are the easier methods? :
> 
> <map:match pattern="annotation\*"
>   <map:select type="fileexists">
>      <map:parameter name="filename" value="annotation\{1}"/>
> 
>      <map:when test="fileexists">
>           <map:generate src="annotation\{1}"/>
>      </map:when>
>      <map:otherwise>
>          <map:generate src="annotation\default.xml"/>
>       </map:otherwise>
>   </map:select>
>   <map:transform src="annotation.xsl"/>
> </map:match>

This might be one approach. Another one could be with an Action like this:

  <map:match pattern="annotation/*"
    <map:act type="fileexists" src="annotation/{1}">
      <map:parameter name="default" value="annotation/default.xml"/>
 
      <map:generate src="{the-file}"/>
    </map:act>
    <map:transform src="annotation.xsl"/>
  </map:match>

the mentioned Action will check for the file and return a Map containing 
"the-file" as the key and the filename as its value depending on the existance 
test (either the value of the source attribute or of the parameter "default").

Giacomo

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