Add method to get Rackspace Cloudfiles object

[gigo6000]

The Rackspace Cloudfiles object is needed to get the CDN URL: $object->public_uri(), and currently there's no way to to this.

[l3l0]

Hello @gigo6000

Thanks for PR but I have some issues with this.

You cannot use tryGetObject in Filesystem cause there is not such method in Adapter interface (Filesystem working on interface but it does not have information about concrete implementation and even then... not all adapters has some object).
You inject RackspaceContaine (CF_Container) object into adapter constructor so I think you can use this object to get public_uri in some other specific class created for that in your code (so just inject it to the other service)

Gaufrette is lib for file handling (read, write, delete etc) which allow change adapter without change our file handling code. File will be saved in some other place (amazon, ftp, other local path) then and it is really cool... and it working cause we using interface not concrete implementation that why I think I cannot merge your PR. sorry...

[gigo6000]

Thanks I didn't notice I could get the object from the rackspace container.

[gigo6000]

Do you know if there's a way to get the Cloudfiles container as a service? I can get the CF_Container object from the CF_Connection object using get_container(), but when I try the code below it returns a CF_Connection intance. And creating the CF_Container service doesn't work because the parameters are passed by reference wich triggers a PHP warning.

  <service id="acme_demo.cloudfiles_container" class="CF_Connection">
      <argument type="service" id="acme_demo.cloudfiles_authentication"></argument>

      <call method="get_container">
         <argument key="container">%acme_demo.container%</argument>
      </call>
  </service>

[l3l0]

I haven't try it yet. I created issue for that in GaufretteBundle and try to handle this soon as possible. If you find a good way to handle that please share in KnpLabs/KnpGaufretteBundle#27