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#include "nsISupports.idl"

interface nsIDOMStorage2;
interface nsIPrincipal;

[scriptable, uuid(9efc2081-218f-4622-837b-40bdb870a1c8)]
interface nsIDOMStorageManager : nsISupports
{
  /**
   * Return the amount of disk space used by a domain.  Usage is checked
   * against the domain of the page that set the key (the owner domain), not
   * the domain of the storage object.
   *
   * @param aOwnerDomain The domain to check.
   * @returns the space usage of the domain, in bytes.
   */
  long getUsage(in AString aOwnerDomain);

  /**
   * Clear keys owned by offline applications.  All data owned by a domain
   * with the "offline-app" permission will be removed from the database.
   */
  void clearOfflineApps();

  /**
   * Returns instance of localStorage object for aURI's origin.
   * This method ensures there is always only a single instance
   * for a single origin.
   */
  nsIDOMStorage2 getLocalStorageForPrincipal(in nsIPrincipal aPrincipal);
};
