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+<?php
+
+/**
+ * An abstract class that defines shared components for products that use
+ * OpenStack Nova
+ *
+ * @copyright 2012-2013 Rackspace Hosting, Inc.
+ * See COPYING for licensing information
+ *
+ * @package phpOpenCloud
+ * @version 1.0
+ * @author Glen Campbell <glen.campbell@rackspace.com>
+ */
+
+namespace OpenCloud\Common;
+
+use OpenCloud\OpenStack;
+use OpenCloud\Common\Lang;
+use OpenCloud\Compute\Flavor;
+
+/**
+ * Nova is an abstraction layer for the OpenStack compute service.
+ *
+ * Nova is used as a basis for several products, including Compute services
+ * as well as Rackspace's Cloud Databases. This class is, in essence, a vehicle
+ * for sharing common code between those other classes.
+ */
+abstract class Nova extends Service 
+{
+
+	private $_url;
+
+	/**
+	 * Called when creating a new Compute service object
+	 *
+	 * _NOTE_ that the order of parameters for this is *different* from the
+	 * parent Service class. This is because the earlier parameters are the
+	 * ones that most typically change, whereas the later ones are not
+	 * modified as often.
+	 *
+	 * @param \OpenCloud\Identity $conn - a connection object
+	 * @param string $serviceRegion - identifies the region of this Compute
+	 *      service
+	 * @param string $urltype - identifies the URL type ("publicURL",
+	 *      "privateURL")
+	 * @param string $serviceName - identifies the name of the service in the
+	 *      catalog
+	 */
+	public function __construct(
+		OpenStack $conn,
+	    $serviceType, 
+	    $serviceName, 
+	    $serviceRegion, 
+	    $urltype
+	) {
+		parent::__construct(
+			$conn,
+			$serviceType,
+			$serviceName,
+			$serviceRegion,
+			$urltype
+		);
+        
+		$this->_url = Lang::noslash(parent::Url());
+        
+        $this->getLogger()->info(Lang::translate('Initializing Nova...'));
+	}
+
+	/**
+	 * Returns a flavor from the service
+	 *
+	 * This is a factory method and should generally be called instead of
+	 * creating a Flavor object directly.
+	 *
+	 * @api
+	 * @param string $id - if supplied, the Flavor identified by this is
+	 *      retrieved
+	 * @return Compute\Flavor object
+	 */
+	public function Flavor($id = null) 
+	{
+	    return new Flavor($this, $id);
+	}
+
+	/**
+	 * Returns a list of Flavor objects
+	 *
+	 * This is a factory method and should generally be called instead of
+	 * creating a FlavorList object directly.
+	 *
+	 * @api
+	 * @param boolean $details - if TRUE (the default), returns full details.
+	 *      Set to FALSE to retrieve minimal details and possibly improve
+	 *      performance.
+	 * @param array $filter - optional key/value pairs for creating query
+	 *      strings
+	 * @return Collection (or FALSE on an error)
+	 */
+	public function FlavorList($details = true, array $filter = array()) 
+	{
+	    if ($details) {
+	        $url = $this->Url(Flavor::ResourceName().'/detail', $filter);
+	    } else {
+	        $url = $this->Url(Flavor::ResourceName(), $filter);
+	    }
+	    return $this->Collection('\OpenCloud\Compute\Flavor', $url);
+	}
+
+    /**
+     * Gets a request from an HTTP source and ensures that the
+     * content type is always "application/json"
+     *
+     * This is a simple subclass of the parent::Request() method that ensures
+     * that all Compute requests use application/json as the Content-Type:
+     *
+     * @param string $url - the URL of the request
+     * @param string $method - the HTTP method ("GET" by default)
+     * @param array $headers - an associative array of headers to pass to
+     *      the request
+     * @param string $body - optional body for POST or PUT requests
+     * @return \Rackspace\HttpResult object
+     */
+	public function Request($url, $method = 'GET', array $headers = array(), $body = null) 
+	{
+		$headers['Content-Type'] = RAXSDK_CONTENT_TYPE_JSON;
+		return parent::Request($url, $method, $headers, $body);
+	}
+
+	/**
+	 * Loads the available namespaces from the /extensions resource
+	 */
+	protected function load_namespaces() 
+	{
+	    $ext = $this->Extensions();
+	    foreach($ext as $obj) {
+	        $this->_namespaces[] = $obj->alias;
+	    }
+	}
+
+}