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.arrow.flight;
  
  /**
   * A visitor interface to access SessionOptionValue's contained value.
   *
   * @param <T> Return type of the visit operation.
   */
  public interface SessionOptionValueVisitor<T> {
    /** A callback to handle SessionOptionValue containing a String. */
    T visit(String value);
  
    /** A callback to handle SessionOptionValue containing a boolean. */
    T visit(boolean value);
  
    /** A callback to handle SessionOptionValue containing a long. */
    T visit(long value);
  
    /** A callback to handle SessionOptionValue containing a double. */
    T visit(double value);
  
    /** A callback to handle SessionOptionValue containing an array of String. */
    T visit(String[] value);
  
    /**
     * A callback to handle SessionOptionValue containing no value.
     *
     * <p>By convention, an attempt to set a valueless SessionOptionValue should attempt to unset or
     * clear the named option value on the server.
     */
    T visit(Void value);
  }
  