now is the time to do this; retrofitting this sort of behavior in later releases is likely to be painful and not
likely to be backwards compatible
From: Stephan Koops
Sent: Mon 3/3/2008 11:07 AM
To: dev_at_jsr311.dev.java.net
Subject: Re: JSR311: URI-based conneg
Why not support languages, for example: GET /foo.en.xml ? I think, it is
very useful to be used by browsers.
I tried to look in the mailing list archive, but it didn't answer.
Stephan
Marc Hadley schrieb:
> Any other feedback on this proposal ? When we discussed it originally
> the EG seemed to be generally in favour of adding this kind of
> functionality - is that still the case ?
>
> Marc.
>
> On Feb 19, 2008, at 12:46 PM, Marc Hadley wrote:
>
>> I'd like to revive a thread started way back in Sept last year, see:
>> https://jsr311.dev.java.net/servlets/ReadMsg?list=dev&msgNo=650
>>
>> The topic was support for URI-based content negotiation, essentially
>> allowing a client to
>>
>> GET /foo.xml
>>
>> as an alternative to
>>
>> GET /foo
>> Accept: application/xml
>>
>> I'd like to offer the following concrete proposal:
>>
>> - We only offer automatic support for content types, nothing for
>> language or charset negotiation.
>>
>> - When the feature is enabled:
>>
>> * A request URI that ends with an extension is matched as if that
>> extension were not present. E.g. @Path("widgets") would match
>> requests for widgets, widgets.xml and widgets.json
>>
>> * If a URI template ends in a variable then the variable value is
>> injected without the extension. E.g. @Path("widgets/{id}") with
>> request for widgets/1.xml and @PathParam("id") String id would result
>> in a value of "1" for id.
>>
>> * The extension is compared to the keys in
>> ApplicationConfig.getExtensionMappings (Map<String, MediaType). If a
>> match is found any Accept header value is replaced with the value for
>> the matching key.
>>
>> - An @Path property style is provided to control the behavior. A
>> value of 'platonic' means that the path should be treated as part of
>> a platonic URI and the above behaviour is enabled. A value of
>> 'distinct' means that the path is distinct and disables the above
>> behaviour. The default value of 'default' defers to an application
>> wide default specified as a property of ApplicationConfig (this will
>> default to not enabled).
>>
>> - Existing UriInfo methods are not affected, any extension in the URI
>> is included in the path returned by any of the methods. For
>> convenience we add UriInfo.getPathExtension() that returns the
>> extension or null if there isn't one, and
>> UriInfo.getPlatonicRequestUriBuilder which returns a URI builder for
>> the request minus the extension. We also add a
>> UriBuilder.extension(String) that adds the supplied extension to the
>> current final path segment.
>>
>> An example:
>>
>> @Path("widgets")
>> public class WidgetsResource {
>>
>> @Context UriInfo uris;
>>
>> @GET
>> @ProduceMime({"application/xml", "application/json")
>> public WidgetList getWidgets() {
>> ....
>> }
>>
>> @POST
>> @ProduceMime({"application/xml", "application/json"})
>> public Response addWidget(Widget input) {
>> Widget w = createWidgetEntry(input);
>> URI platonic = uris.getBaseUriBuilder()
>> .path(WidgetResource.class)
>> .build(w.getId());
>> URI distinct = uris.getBaseUriBuilder()
>> .path(WidgetResource.class)
>> .extension(uris.getExtension())
>> .build(w.getId());
>> return Response.created(platonic)
>> .contentLocation(distinct);
>> }
>> }
>>
>> @Path("widgets/{id}")
>> public class WidgetResource {
>> ...
>> }
>>
>> Assume you have an app config that maps "xml" to application/xml and
>> "json" to application/json. Also assume you have the required msg
>> body readers and writers for XML and JSON.
>>
>> GET /widgets.xml will get you XML, GET /widgets.json will get you
>> JSON, GET /widgets will get whichever matches your accept header most
>> closely.
>>
>> You can POST XML or JSON to /widgets.xml but you'll always get back
>> XML. Same for /widgets.json but you'll always get back JSON.
>>
>> If you POST to a distinct URI you'll get a platonic location and a
>> distinct content location. If you post to a platonic you'll get
>> platonic location and content location (the latter is unfortunate but
>> a custom message body writer could patch the value once the format is
>> known.
>>
>> Thoughts, comments ?
>> Marc.
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe_at_jsr311.dev.java.net
For additional commands, e-mail: dev-help_at_jsr311.dev.java.net
Notice: This email message, together with any attachments, may contain information of BEA Systems, Inc., its subsidiaries and affiliated entities, that may be confidential, proprietary, copyrighted and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.