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  package org.apache.cayenne.configuration;
  
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.map.DbAttribute;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.map.DbRelationship;
  import org.apache.cayenne.map.Embeddable;
  import org.apache.cayenne.map.EmbeddableAttribute;
  import org.apache.cayenne.map.ObjAttribute;
  import org.apache.cayenne.map.ObjEntity;
  import org.apache.cayenne.map.ObjRelationship;
  import org.apache.cayenne.map.Procedure;
  import org.apache.cayenne.map.ProcedureParameter;
  import org.apache.cayenne.map.QueryDescriptor;
  
  /**
   * A visitor interface for implementing operations on different types of
   * {@link ConfigurationNode} objects.
   * 
   * @since 3.1
   */
  public interface ConfigurationNodeVisitor<T> {
  
      T visitDataChannelDescriptor(DataChannelDescriptor channelDescriptor);
  
      T visitDataNodeDescriptor(DataNodeDescriptor nodeDescriptor);
  
      T visitDataMap(DataMap dataMap);
  
      T visitObjEntity(ObjEntity entity);
  
      T visitDbEntity(DbEntity entity);
  
      T visitEmbeddable(Embeddable embeddable);
  
      T visitEmbeddableAttribute(EmbeddableAttribute attribute);
  
      T visitObjAttribute(ObjAttribute attribute);
  
      T visitDbAttribute(DbAttribute attribute);
  
      T visitObjRelationship(ObjRelationship relationship);
  
      T visitDbRelationship(DbRelationship relationship);
  
      T visitProcedure(Procedure procedure);
  
      T visitProcedureParameter(ProcedureParameter parameter);
  
      T visitQuery(QueryDescriptor query);
  }
  