package org.andromda.repositories.emf;
   
   import org.andromda.core.repository.RepositoryFacadeException;
   import org.apache.commons.lang.StringUtils;
   import org.eclipse.emf.common.util.URI;
   
   /**
    * Contains some utilities methods for dealing with the EMF repository
    * facade functionality.
   *
   * @author Chad Brandon
   */
  class EMFRepositoryFacadeUtils
  {
      /**
       * The URI file prefix.
       */
      private static final String FILE_PREFIX = "file:";
  
      /**
       * The URI archive file prefix.
       */
      private static final String ARCHIVE_FILE_PREFIX = "jar:file:";
  
      /**
       * Creates the EMF URI instance from the given <code>uri</code>.
       *
       * @param uri the path from which to create the URI.
       * @return the URI
       */
      static URI createUri(String uri)
      {
          if (!uri.startsWith(ARCHIVE_FILE_PREFIX) && uri.startsWith(FILE_PREFIX))
          {
              final String filePrefixWithSlash = FILE_PREFIX + '/';
              if (!uri.startsWith(filePrefixWithSlash))
              {
                  uri = StringUtils.replaceOnce(
                          uri,
                          FILE_PREFIX,
                          filePrefixWithSlash);
              }
          }
          final URI resourceUri = URI.createURI(uri);
          if (resourceUri == null)
          {
              throw new RepositoryFacadeException("The path '" + uri + "' is not a valid URI");
          }
          return resourceUri;
      }
  }