code: ///////////////////////////////////////////////////////////////////////////////////////////////
  // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
  // Copyright (C) 2001-2023 the original author or authors.
  //
  // This library is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 2.1 of the License, or (at your option) any later version.
  //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.filters;
  
  import java.util.Objects;
  
  /**
   * This filter element is immutable and accepts an Integer in a range.
   */
  class IntRangeFilterElement implements IntFilterElement {
  
      /** Lower bound of the range. */
      private final Integer lowerBound;
  
      /** Upper bound of the range. */
      private final Integer upperBound;
  
      /**
       * Constructs a {@code IntRangeFilterElement} with a
       * lower bound and an upper bound for the range.
       *
       * @param lowerBound the lower bound of the range.
       * @param upperBound the upper bound of the range.
       */
      /* package */ IntRangeFilterElement(int lowerBound, int upperBound) {
          this.lowerBound = lowerBound;
          this.upperBound = upperBound;
      }
  
      @Override
      public boolean accept(int intValue) {
          return lowerBound.compareTo(intValue) <= 0
              && upperBound.compareTo(intValue) >= 0;
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(lowerBound, upperBound);
      }
  
      @Override
      public boolean equals(Object other) {
          if (this == other) {
              return true;
          }
          if (other == null || getClass() != other.getClass()) {
              return false;
          }
          final IntRangeFilterElement intRangeFilter = (IntRangeFilterElement) other;
          return Objects.equals(lowerBound, intRangeFilter.lowerBound)
                  && Objects.equals(upperBound, intRangeFilter.upperBound);
      }
  
  }
  