/**
  * List hosted service accounts for a specified subscription.
  * 
  * @command-name List
  * @command-description List hosted service accounts for a specified subscription.
  * @command-parameter-for $subscriptionId Microsoft_Console_Command_ParameterSource_Argv|Microsoft_Console_Command_ParameterSource_ConfigFile|Microsoft_Console_Command_ParameterSource_Env --SubscriptionId|-sid Required. This is the Windows Azure Subscription Id to operate on.
  * @command-parameter-for $certificate Microsoft_Console_Command_ParameterSource_Argv|Microsoft_Console_Command_ParameterSource_ConfigFile|Microsoft_Console_Command_ParameterSource_Env --Certificate|-cert Required. This is the .pem certificate that user has uploaded to Windows Azure subscription as Management Certificate.
  * @command-parameter-for $certificatePassphrase Microsoft_Console_Command_ParameterSource_Argv|Microsoft_Console_Command_ParameterSource_ConfigFile --Passphrase|-p The certificate passphrase. If not specified, a prompt will be displayed.
  * @command-example List hosted service accounts for subscription:
  * @command-example List -sid="<your_subscription_id>" -cert="mycert.pem"
  */
 public function listCommand($subscriptionId, $certificate, $certificatePassphrase)
 {
     $client = new Microsoft_WindowsAzure_Management_Client($subscriptionId, $certificate, $certificatePassphrase);
     $result = $client->listHostedServices();
     if (count($result) == 0) {
         echo 'No data to display.';
     }
     foreach ($result as $object) {
         $this->_displayObjectInformation($object, array('ServiceName', 'Url'));
     }
 }