// FIXME: Should also use events!
  public void deleteAttachment(Attachment att) throws ProviderException {
    if (m_provider == null) return;

    m_provider.deleteAttachment(att);

    m_engine.getSearchManager().pageRemoved(att);

    m_engine.getReferenceManager().clearPageEntries(att.getName());
  }
  /**
   * Stores an attachment directly from a stream. If the attachment did not exist previously, this
   * method will create it. If it did exist, it stores a new version.
   *
   * @param att Attachment to store this under.
   * @param in InputStream from which the attachment contents will be read.
   * @throws IOException If writing the attachment failed.
   * @throws ProviderException If something else went wrong.
   */
  public void storeAttachment(Attachment att, InputStream in)
      throws IOException, ProviderException {
    if (m_provider == null) {
      return;
    }

    //
    //  Checks if the actual, real page exists without any modifications
    //  or aliases.  We cannot store an attachment to a non-existant page.
    //
    if (!m_engine.getPageManager().pageExists(att.getParentName())) {
      // the caller should catch the exception and use the exception text as an i18n key
      throw new ProviderException("attach.parent.not.exist");
    }

    m_provider.putAttachmentData(att, in);

    m_engine.getReferenceManager().updateReferences(att.getName(), new java.util.Vector());

    WikiPage parent = new WikiPage(m_engine, att.getParentName());
    m_engine.updateReferences(parent);

    m_engine.getSearchManager().reindexPage(att);
  }