public Pair<List<RepositoryLocationGroup>, List<RepositoryLocation>> groupLocations(
        final List<RepositoryLocation> in) {
      final List<RepositoryLocationGroup> groups = new ArrayList<RepositoryLocationGroup>();
      final List<RepositoryLocation> singles = new ArrayList<RepositoryLocation>();

      final MultiMap<SVNURL, RepositoryLocation> map = new MultiMap<SVNURL, RepositoryLocation>();

      for (RepositoryLocation location : in) {
        final SvnRepositoryLocation svnLocation = (SvnRepositoryLocation) location;
        final String url = svnLocation.getURL();

        final SVNURL root = SvnUtil.getRepositoryRoot(myVcs, url);
        if (root == null) {
          // should not occur
          LOG.info("repository root not found for location:" + location.toPresentableString());
          singles.add(location);
        } else {
          map.putValue(root, svnLocation);
        }
      }

      final Set<SVNURL> keys = map.keySet();
      for (SVNURL key : keys) {
        final Collection<RepositoryLocation> repositoryLocations = map.get(key);
        if (repositoryLocations.size() == 1) {
          singles.add(repositoryLocations.iterator().next());
        } else {
          final SvnRepositoryLocationGroup group =
              new SvnRepositoryLocationGroup(key, repositoryLocations);
          groups.add(group);
        }
      }
      return new Pair<List<RepositoryLocationGroup>, List<RepositoryLocation>>(groups, singles);
    }
  @Override
  public Pair<SvnChangeList, FilePath> getOneList(final VirtualFile file, VcsRevisionNumber number)
      throws VcsException {
    final RootUrlInfo rootUrlInfo =
        myVcs.getSvnFileUrlMapping().getWcRootForFilePath(new File(file.getPath()));
    if (rootUrlInfo == null) return null;
    final VirtualFile root = rootUrlInfo.getVirtualFile();
    if (root == null) return null;
    final SvnRepositoryLocation svnRootLocation =
        (SvnRepositoryLocation) getLocationFor(new FilePathImpl(root));
    if (svnRootLocation == null) return null;
    final String url = svnRootLocation.getURL();
    final long revision;
    try {
      revision = Long.parseLong(number.asString());
    } catch (NumberFormatException e) {
      throw new VcsException(e);
    }

    final SvnChangeList[] result = new SvnChangeList[1];
    final SVNLogClient logger;
    final SVNRevision revisionBefore;
    final SVNURL repositoryUrl;
    final SVNURL svnurl;
    final SVNInfo targetInfo;
    try {
      logger = myVcs.createLogClient();
      revisionBefore = SVNRevision.create(revision);

      svnurl = SVNURL.parseURIEncoded(url);
      final SVNWCClient client = myVcs.createWCClient();
      final SVNInfo info = client.doInfo(svnurl, SVNRevision.UNDEFINED, SVNRevision.HEAD);
      targetInfo = client.doInfo(new File(file.getPath()), SVNRevision.UNDEFINED);
      if (info == null) {
        throw new VcsException("Can not get repository URL");
      }
      repositoryUrl = info.getRepositoryRootURL();
    } catch (SVNException e) {
      LOG.info(e);
      throw new VcsException(e);
    }

    tryExactHit(svnRootLocation, result, logger, revisionBefore, repositoryUrl, svnurl);
    if (result[0] == null) {
      tryByRoot(result, logger, revisionBefore, repositoryUrl);
      if (result[0] == null) {
        FilePath path =
            tryStepByStep(svnRootLocation, result, logger, revisionBefore, targetInfo, svnurl);
        path = path == null ? new FilePathImpl(file) : path;
        // and pass & take rename context there
        return new Pair<SvnChangeList, FilePath>(result[0], path);
      }
    }
    if (result[0].getChanges().size() == 1) {
      final Collection<Change> changes = result[0].getChanges();
      final Change change = changes.iterator().next();
      final ContentRevision afterRevision = change.getAfterRevision();
      if (afterRevision != null) {
        return new Pair<SvnChangeList, FilePath>(result[0], afterRevision.getFile());
      } else {
        return new Pair<SvnChangeList, FilePath>(result[0], new FilePathImpl(file));
      }
    }
    String relativePath =
        SVNPathUtil.getRelativePath(
            targetInfo.getRepositoryRootURL().toString(), targetInfo.getURL().toString());
    relativePath = relativePath.startsWith("/") ? relativePath : "/" + relativePath;
    final Change targetChange = result[0].getByPath(relativePath);
    if (targetChange == null) {
      FilePath path =
          tryStepByStep(svnRootLocation, result, logger, revisionBefore, targetInfo, svnurl);
      path = path == null ? new FilePathImpl(file) : path;
      // and pass & take rename context there
      return new Pair<SvnChangeList, FilePath>(result[0], path);
    }
    return new Pair<SvnChangeList, FilePath>(result[0], new FilePathImpl(file));
  }
  @SuppressWarnings("MethodMayBeStatic")
  private String formatWc(
      @NotNull WCInfo info, @NotNull Collection<WorkingCopyFormat> upgradeFormats) {
    final StringBuilder sb =
        new StringBuilder()
            .append("<html><head>")
            .append(UIUtil.getCssFontDeclaration(UIUtil.getLabelFont()))
            .append("</head><body><table bgColor=\"")
            .append(ColorUtil.toHex(UIUtil.getPanelBackground()))
            .append("\">");

    sb.append("<tr valign=\"top\"><td colspan=\"3\"><b>")
        .append(info.getPath())
        .append("</b></td></tr>");
    if (info.hasError()) {
      sb.append("<tr valign=\"top\"><td>URL:</td><td colspan=\"2\" color=\"")
          .append(ColorUtil.toHex(JBColor.red))
          .append("\">")
          .append(info.getErrorMessage())
          .append("</td></tr>");
    } else {
      sb.append("<tr valign=\"top\"><td>URL:</td><td colspan=\"2\">")
          .append(info.getRootUrl())
          .append("</td></tr>");
    }
    if (upgradeFormats.size() > 1) {
      sb.append("<tr valign=\"top\"><td>Format:</td><td>")
          .append(info.getFormat().getName())
          .append("</td><td><a href=\"")
          .append(CHANGE_FORMAT)
          .append("\">Change</a></td></tr>");
    } else {
      sb.append("<tr valign=\"top\"><td>Format:</td><td colspan=\"2\">")
          .append(info.getFormat().getName())
          .append("</td></tr>");
    }

    if (!Depth.INFINITY.equals(info.getStickyDepth()) && !info.hasError()) {
      // can fix
      sb.append("<tr valign=\"top\"><td>Depth:</td><td>")
          .append(info.getStickyDepth().getName())
          .append("</td><td><a href=\"")
          .append(FIX_DEPTH)
          .append("\">Fix</a></td></tr>");
    } else {
      sb.append("<tr valign=\"top\"><td>Depth:</td><td colspan=\"2\">")
          .append(info.getStickyDepth().getName())
          .append("</td></tr>");
    }

    final NestedCopyType type = info.getType();
    if (NestedCopyType.external.equals(type) || NestedCopyType.switched.equals(type)) {
      sb.append("<tr valign=\"top\"><td colspan=\"3\"><i>")
          .append(type.getName())
          .append("</i></td></tr>");
    }
    if (info.isIsWcRoot()) {
      sb.append("<tr valign=\"top\"><td colspan=\"3\"><i>")
          .append("Working copy root</i></td></tr>");
    }
    if (!info.hasError()) {
      if (info.getFormat().isOrGreater(WorkingCopyFormat.ONE_DOT_SEVEN)) {
        sb.append("<tr valign=\"top\"><td colspan=\"3\"><a href=\"")
            .append(CLEANUP)
            .append("\">Cleanup</a></td></tr>");
      }
      sb.append("<tr valign=\"top\"><td colspan=\"3\"><a href=\"")
          .append(CONFIGURE_BRANCHES)
          .append("\">Configure Branches</a></td></tr>");
      sb.append("<tr valign=\"top\"><td colspan=\"3\"><a href=\"")
          .append(MERGE_FROM)
          .append("\"><b>Merge From...</b></a></i></td></tr>");

      sb.append("</table></body></html>");
    }
    return sb.toString();
  }