Re: [Springframework-developer] Retrieve all class path resources with the same name

[Colin S. <col...@ex...>]

W/regards to your 2nd paragraph, at a minimum you'd have to modify the 
present implementation of
   PathMatcher.isPattern
since it would trigger on the * in classpath*:, as used in 
PathMatchingResourcePatternResolver before the prefix is ever matched by 
code in ClassPathResourcePatternResolver...


jürgen höller [werk3AT] wrote:

>I quite like "classpath*:" too: It's a resource pattern prefix, just like "classpath:" is a resource location prefix. Everything after the ":" should be the actual resource pattern, so I don't really like a "*" there.
> 
>"classpath*:*-beans.xml" will _not_ work, as the implementation considers the path after "classpath*:" a standard classpath resource location. This means that the location after "classpath*:" is not supposed to contain an Ant-style pattern in any case; it will not be parsed but rather passed straight through to the ClassLoader.
> 
>Juergen
> 
>
>________________________________
>
>Von: spr...@li... im Auftrag von Tom Turelinckx
>Gesendet: Fr 25.06.2004 12:16
>An: spr...@li...
>Betreff: Re: [Springframework-developer] Retrieve all class path resources with the same name
>
>
>
>I've been thinking about this, and though I had some doubts at first, I
>definitely like "classpath*:" now, because of the * character.
>
>The point is that ResourceLoader takes a location, while
>ResourcePatternResolver takes a location _pattern_, and depending on the
>place where you use a resource string, a location pattern may or may not
>be allowed. In this regard it is important to think of
>"classpath:beans.xml" as a location, and "classpath*:beans.xml" as a
>location pattern.
>
>Thus, a resource location always results in at most one matching file,
>which is consistent with the way Resource and ResourceLoader are
>defined.
>
>I think we should clearly document that "classpath*:" is not considered
>a prefix, but part of a location pattern, so its use is only allowed
>where location patterns are allowed.
>
>The implementation is tricky though. I suppose "classpath:*-beans.xml"
>would work if the individual locations are resolvable to File, but what
>about "classpath*:*-beans.xml"? Not that I would try to use a pattern
>like that myself though ;-)
>
>Kind regards,
>Tom.
>
>On Fri, 25 Jun 2004 09:25:00 +0200, "jürgen höller [werk3AT]"
><jue...@we...> said:
>  
>
>>Any thoughts about the prefix naming? Is "classpath*:" for explictly
>>wanting all matching classpath resources fine?
>>
>>Juergen
>>
>>
>>________________________________
>>
>>Von: spr...@li... im Auftrag von
>>jürgen höller [werk3AT]
>>Gesendet: Do 24.06.2004 09:56
>>An: spr...@li...
>>Betreff: Re: [Springframework-developer] Retrieve all class path
>>resources with the same name
>>
>>
>>
>>Colin,
>>
>>You do have a point there. We coul use a prefix like "classpath*:" for
>>loading all matching resources from the classpath. ("resources:" is too
>>general, IMO: It's about multiple _classpath_ resources.) That would keep
>>the behavior of "classpath:" in any case, and allow to explicitly specify
>>"I want all matching resources" via "classpath*:".
>>
>>Interestingly, a classpath resource string is the only resource location
>>accepted by Spring's ResourceLoader that is not unique but can result in
>>multiple matching files.
>>
>>Juergen
>>
>>
>>________________________________
>>
>>Von: spr...@li... im Auftrag von
>>Colin Sampaleanu
>>Gesendet: Do 24.06.2004 06:06
>>An: spr...@li...
>>Betreff: Re: [Springframework-developer] Retrieve all class path
>>resources with the same name
>>
>>
>>
>>I've been thinking about this, and was wondering if it's appropriate
>>that _all_ matching resources are found, all the time, and also if we
>>should be worried about a backwards incompatible change.
>>
>>Before, in ClassPathXmlApplicationContext, the locations
>>   beans.xml
>>and
>>   classpath:beans.xml
>>would return one resource, regardless of how many there were.
>>
>>Now the former still returns one, while the latter returns 1-x.
>>
>>Is it a problem that we've made a backwards incompatible change for the
>>latter form?
>>Is it a problem that somebody, if they want just one resource, has to
>>know that they need to use the first form? Additionally to this, this
>>distinction is possible when something like
>>ClassPathXmlApplicationContext, but for others that override the default
>>getResourceByPath to default to something else than a classpath
>>resource,  it's not a possibility.
>>
>>I guess somebody could say, if there are multiple resources available
>>under that name, is it ever appropriate to return just one? I think so,
>>since after all, even in that case, the classloader resource loading
>>strategy is well defined and deterministic.
>>
>>Since the 'classpath:' prefix is something we made up, why don't we keep
>>this for just a single resource, and use something like 'resources:' (or
>>whatever) to mean multiple resources?
>>
>>Colin
>>
>>jürgen höller [werk3AT] wrote:
>>
>>    
>>
>>>FYI, I've just refined PathMatchingResourcePatternResolver to be able to retrieve all class path resources with the same name. It actually inherits this from the new base class ClassPathResourcePatternResolver.
>>>
>>>http://sourceforge.net/forum/forum.php?thread_id=1096825&forum_id=250340
>>>
>>>So "classpath:/beans.xml" will load all beans.xml files in classes directories or JAR files, if passed into PathMatchingResourcePatternResolver. Of course, Ant-style file path patterns like "/WEB-INF/*-context.xml" still work.
>>>
>>>As this is automatically used by "contextConfigLocation" parameters, this means that we can specify such a URL for a root web application context, for example to auto-load all beans.xml files contained in deployed JAR files in WEB-INF\lib (HiveMind-style)!
>>>
>>>Juergen
>>>
>>>
>>>DI Jürgen Höller
>>>Senior System Architect
>>>______________________________________
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>>>      
>>>
>>    
>>