Groups > comp.lang.java.programmer > #35755

Re: Rest parameter without value

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From	Arne Vajhøj <arne@vajhoej.dk>
Newsgroups	comp.lang.java.programmer
Subject	Re: Rest parameter without value
Date	Fri, 14 Oct 2016 14:49:09 -0400
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On 10/14/2016 8:28 AM, Jukka Lahtinen wrote:
> I have been working with java, but REST is new to me.
> Now I am working on a REST client for the first time.
> I have already managed to use a rest request with a path parameter and
> another one with query parameters.
>
> Now the request with a path parameter should in some occasions contain a
> parameter without a value.

> What I have tried looks essentially like this:
>
> String url = "http://machine/path/v3.0/{keyvalue}";
> Private javax.ws.rs.Client client; // initialized in the constructor
> ..
>
> private Object makeCall(String keyvalue, boolean b) {
>   UriBuilder builder = UriBuilder.fromUri( url ).path( path ).
>                         resolveTemplate( "keyvalue", keyvalue );
>   WebTarget target = client.target( builder );
>   if (b) {
>     target = target.queryParam("foo", "");
>   }
>   Response resp = target.request().headers(makeHeaders()).get();
>   Object ret = null;
>   ..
>   // resp handling not shown here
>   ..
>   return ret;
> }
>
> Debugging this, I lookd at target after the target.queryParam call and
> noticed that target contains a ResteasyUriBuilder object uriBuilder,
> where the attribute "query" now contains "foo=".
> So this apparently will make the actual url look like this:
>
> http://machine/path/v3.0/keyvalue?foo=
>
> But I need it without the equals at the end. How do I do that?
>
> I also tried passing null to the target.queryParam call instead of the
> empty String,
>   target = target.queryParam("foo", null);
> but that way target.uriBuildeer.query remains null.

The API may not support it, because it does not make much sense
in REST.

http://host/resource  ~=  SELECT * FROM resource

http://host/resource/value  ~=  SELECT * FROM resource WHERE id = value

http://host/resource?nam=val  ~=  SELECT * FROM resource WHERE nam=val

http://host/resource?nam  ~=  ????

But as fallback mechanism you can always drop the JAX-RS client classes
and revert to Java HttpURLCOnnection or Apache HttpClient with a JSON
library. That gives you full freedom to do whatever you want.

Arne

Thread

Rest parameter without value Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2016-10-14 15:28 +0300
  Re: Rest parameter without value Arne Vajhøj <arne@vajhoej.dk> - 2016-10-14 14:49 -0400
    Re: Rest parameter without value Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2016-10-17 08:48 +0300
      Re: Rest parameter without value Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2016-10-17 09:50 +0300
  Re: Rest parameter without value 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-14 21:16 +0100
  Re: Rest parameter without value Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2016-10-17 08:30 +0300

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