/**
   * (inheritDoc)
   *
   * @see org.goko.featuremanager.service.IFeatureManager#getInstallableUnits()
   */
  @Override
  public List<GkInstallableUnit> getInstallableUnits(IProgressMonitor monitor) throws GkException {
    List<GkInstallableUnit> lstUnits = new ArrayList<GkInstallableUnit>();
    // get the repository managers and define our repositories
    IMetadataRepositoryManager manager =
        (IMetadataRepositoryManager)
            getProvisioningAgent().getService(IMetadataRepositoryManager.SERVICE_NAME);

    try {
      manager.addRepository(new URI("http://update.goko.fr/"));
      manager.loadRepository(new URI("http://update.goko.fr/"), monitor);
    } catch (ProvisionException | OperationCanceledException | URISyntaxException e) {
      throw new GkTechnicalException(e);
    }
    // Query installed units
    IProfileRegistry registry =
        (IProfileRegistry) getProvisioningAgent().getService(IProfileRegistry.SERVICE_NAME);
    IProfile profile = registry.getProfile(IProfileRegistry.SELF);
    Collection<IInstallableUnit> lstInstalledUnits =
        profile.query(new UserVisibleRootQuery(), monitor).toUnmodifiableSet();

    // Query "groups"
    IQuery<IInstallableUnit> query =
        QueryUtil.createLatestQuery(
            QueryUtil.createMatchQuery(
                "properties[$0] == $1 && properties[$2] != null",
                "org.eclipse.equinox.p2.type.group",
                "true",
                "org.eclipse.equinox.p2.type.category"));
    Collection<IInstallableUnit> lstInstallableUnit =
        manager.query(query, monitor).toUnmodifiableSet();

    if (CollectionUtils.isNotEmpty(lstInstallableUnit)) {
      for (IInstallableUnit iInstallableUnit : lstInstallableUnit) {
        GkInstallableUnit gkUnit = new GkInstallableUnit(iInstallableUnit);
        // Same ID already installed ?
        for (IInstallableUnit installedUnit : lstInstalledUnits) {
          if (StringUtils.equals(gkUnit.getId(), installedUnit.getId())) {
            gkUnit.setInstalled(true);
            break;
          }
        }

        lstUnits.add(gkUnit);
      }
    }

    return lstUnits;
  }
 /** Return a collection of features that are available to be installed. */
 public Collection getAvailableFeatures() {
   IQuery query = QueryUtil.createIUPropertyQuery(PROP_TOAST_ROOT, Boolean.TRUE.toString());
   IQueryResult result = metadataManager.query(query, new NullProgressMonitor());
   return result.toSet();
 }