public TargetDirectoryWrapper findOrCreateChild(String relativePath) {
      if (myTargetDirectory != null) {
        final PsiDirectory psiDirectory = myTargetDirectory.findSubdirectory(relativePath);
        if (psiDirectory != null) {
          return new TargetDirectoryWrapper(psiDirectory);
        }
      }
      return new TargetDirectoryWrapper(this, relativePath);
    }
public TargetDirectoryWrapper findOrCreateChild(String relativePath)