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  package org.apache.cayenne.project.extension;
  
  import org.apache.cayenne.configuration.ConfigurationNodeVisitor;
  
  /**
   * <p>DataMap XML file extension mechanics.</p>
   * <p>
   *     Can be used to enhance datamap.map.xml files with additional (really random) information.
   *     By default extensions not used by {@link org.apache.cayenne.runtime.CayenneRuntime}
   *     so they can safely store big chunks of data.
   * </p>
   * <p>
   *     Extensions can be contributed by {@link org.apache.cayenne.project.ProjectModuleExtender#addExtension(ProjectExtension)}
   *     {@link org.apache.cayenne.project.ProjectModule} currently used by Modeler and cli tools, e.g. cdbimport and cgen.
   * </p>
   *
   * @since 4.1
   */
  public interface ProjectExtension {
  
      /**
       * @return delegate that handle loading phase of XML processing
       */
      LoaderDelegate createLoaderDelegate();
  
      /**
       * @return delegate that handle saving phase of XML processing
       */
      SaverDelegate createSaverDelegate();
  
  
      ConfigurationNodeVisitor<String> createNamingDelegate();
  
  }
  