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.formulas;
  
  import java.util.Arrays;
  
  /**
   * A wrapper class for the internal formula factory state.
   * @version 1.2
   * @since 1.2
   */
  public final class FormulaFactoryState {
  
      private final int id;
  
      private final int[] state;
  
      /**
       * Creates a new formula factory state with a given id and internal formula factory data.
       * @param id    the id
       * @param state the formula factory data
       */
      FormulaFactoryState(final int id, final int[] state) {
          this.id = id;
          this.state = Arrays.copyOf(state, state.length);
      }
  
      /**
       * Returns the id of this state.
       * @return the id of this state
       */
      int id() {
          return id;
      }
  
      /**
       * Returns the internal formula factory state.
       * @return the internal formula factory state
       */
      int[] state() {
          return this.state;
      }
  
      @Override
      public String toString() {
          return String.format("FormulaFactoryState{id=%d, state=%s}", id, Arrays.toString(state));
      }
  }
  