@NotNull
  private VirtualFilePointer create(
      @Nullable("null means the pointer will be created from the (not null) url") VirtualFile file,
      @Nullable("null means url has to be computed from the (not-null) file path") String url,
      @NotNull Disposable parentDisposable,
      @Nullable VirtualFilePointerListener listener) {
    VirtualFileSystem fileSystem;
    String protocol;
    String path;
    if (file == null) {
      int protocolEnd = url.indexOf(URLUtil.SCHEME_SEPARATOR);
      if (protocolEnd == -1) {
        protocol = null;
        fileSystem = null;
      } else {
        protocol = url.substring(0, protocolEnd);
        fileSystem = myVirtualFileManager.getFileSystem(protocol);
      }
      path = url.substring(protocolEnd + URLUtil.SCHEME_SEPARATOR.length());
    } else {
      fileSystem = file.getFileSystem();
      protocol = fileSystem.getProtocol();
      path = file.getPath();
      url = VirtualFileManager.constructUrl(protocol, path);
    }

    if (fileSystem == TEMP_FILE_SYSTEM) {
      // for tests, recreate always
      VirtualFile found = file == null ? VirtualFileManager.getInstance().findFileByUrl(url) : file;
      return new IdentityVirtualFilePointer(found, url);
    }

    boolean isJar = fileSystem == JAR_FILE_SYSTEM;
    if (fileSystem != LOCAL_FILE_SYSTEM && !isJar) {
      // we are unable to track alien file systems for now
      VirtualFile found =
          fileSystem == null
              ? null
              : file != null ? file : VirtualFileManager.getInstance().findFileByUrl(url);
      // if file is null, this pointer will never be alive
      return getOrCreateIdentity(url, found);
    }

    if (file == null) {
      String cleanPath = cleanupPath(path, isJar);
      // if newly created path is the same as substringed from url one then the url did not change,
      // we can reuse it
      //noinspection StringEquality
      if (cleanPath != path) {
        url = VirtualFileManager.constructUrl(protocol, cleanPath);
        path = cleanPath;
      }
    }
    // else url has come from VirtualFile.getPath() and is good enough

    VirtualFilePointerImpl pointer =
        getOrCreate(parentDisposable, listener, path, Pair.create(file, url));
    DelegatingDisposable.registerDisposable(parentDisposable, pointer);
    return pointer;
  }
  @NotNull
  private VirtualFilePointer create(
      @Nullable VirtualFile file,
      @NotNull String url,
      @NotNull final Disposable parentDisposable,
      @Nullable VirtualFilePointerListener listener) {
    String protocol;
    IVirtualFileSystem fileSystem;
    if (file == null) {
      protocol = VirtualFileManager.extractProtocol(url);
      fileSystem = myVirtualFileManager.getFileSystem(protocol);
    } else {
      protocol = null;
      fileSystem = file.getFileSystem();
    }
    if (fileSystem == myTempFileSystem) {
      // for tests, recreate always
      VirtualFile found = file == null ? VirtualFileManager.getInstance().findFileByUrl(url) : file;
      return new IdentityVirtualFilePointer(found, url);
    }
    if (fileSystem != myLocalFileSystem && !(fileSystem instanceof ArchiveFileSystem)) {
      // we are unable to track alien file systems for now
      VirtualFile found =
          fileSystem == null
              ? null
              : file != null ? file : VirtualFileManager.getInstance().findFileByUrl(url);
      // if file is null, this pointer will never be alive
      return getOrCreateIdentity(url, found);
    }

    String path;
    if (file == null) {
      path = VirtualFileManager.extractPath(url);
      path = cleanupPath(path, protocol, fileSystem);
      url = VirtualFileManager.constructUrl(protocol, path);
    } else {
      path = file.getPath();
      // url has come from VirtualFile.getUrl() and is good enough
    }

    VirtualFilePointerImpl pointer =
        getOrCreate(parentDisposable, listener, path, Pair.create(file, url));

    DelegatingDisposable.registerDisposable(parentDisposable, pointer);

    return pointer;
  }