code: ///////////////////////////////////////////////////////////////////////////
  //                   __                _      _   ________               //
  //                  / /   ____  ____ _(_)____/ | / / ____/               //
  //                 / /   / __ \/ __ `/ / ___/  |/ / / __                 //
  //                / /___/ /_/ / /_/ / / /__/ /|  / /_/ /                 //
  //               /_____/\____/\__, /_/\___/_/ |_/\____/                  //
  //                           /____/                                      //
  //                                                                       //
  //               The Next Generation Logic Library                       //
  //                                                                       //
  ///////////////////////////////////////////////////////////////////////////
  //                                                                       //
  //  Copyright 2015-20xx Christoph Zengler                                //
  //                                                                       //
  //  Licensed 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.logicng.knowledgecompilation.bdds.io;
  
  import org.logicng.io.graphical.GraphicalDotWriter;
  import org.logicng.io.graphical.generators.BddGraphicalGenerator;
  import org.logicng.knowledgecompilation.bdds.BDD;
  
  import java.io.File;
  import java.io.IOException;
  
  /**
   * A dot file writer for BDDs.  Writes the internal data structure of a BDD to a dot file.
   * @version 2.4.0
   * @since 1.4.0
   * @deprecated This legacy writer will be removed in LogicNG 3.0.0.  For a more configurable and flexible
   * to use graph writer use {@link BddGraphicalGenerator} within the new graphical writer framework.
   */
  @Deprecated
  public final class BDDDotFileWriter {
  
      private static final String DOT_EXTENSION = ".dot";
  
      /**
       * Private constructor.
       */
      private BDDDotFileWriter() {
          // Intentionally left empty.
      }
  
      /**
       * Writes a given BDD as a dot file.
       * @param fileName the file name of the dot file to write
       * @param bdd      the BDD
       * @throws IOException if there was a problem writing the file
       */
      public static void write(final String fileName, final BDD bdd) throws IOException {
          write(new File(fileName.endsWith(DOT_EXTENSION) ? fileName : fileName + DOT_EXTENSION), bdd);
      }
  
      /**
       * Writes a given formula's internal data structure as a dot file.
       * @param file the file of the dot file to write
       * @param bdd  the BDD
       * @throws IOException if there was a problem writing the file
       */
      public static void write(final File file, final BDD bdd) throws IOException {
          BddGraphicalGenerator.builder().build().translate(bdd).write(file, GraphicalDotWriter.get());
      }
  }
  