content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   */
  package org.apache.causeway.applib.graph.tree;
  
  /**
   * @param <U> underlying tree generic type
   * @param <T> converted tree generic type
   */
  public interface TreeConverter<U, T> {
  
      /**
       * Creates a converted node value from the (underlying) node value, also providing context,
       * that is, passing in the resulting node's parent-node and the resulting node's sibling index.
       */
      T fromUnderlyingNode(U value, T parentNode, int siblingIndex);
  
      /**
       * Recovers the original (underlying) node value from given converted node value.
       */
      U toUnderlyingNode(T value);
  
  }
  