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.utils;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  
  /**
   * Utility methods for suppression filters.
   *
   */
  public final class FilterUtil {
  
      /** Stop instances being created. **/
      private FilterUtil() {
      }
  
      /**
       * Checks if suppression source with given fileName exists.
       *
       * @param fileName name of the suppressions file.
       * @return true if suppression file exists, otherwise false
       */
      public static boolean isFileExists(String fileName) {
          boolean suppressionSourceExists;
          try (InputStream stream = CommonUtil.getUriByFilename(fileName).toURL().openStream()) {
              suppressionSourceExists = true;
          }
          catch (CheckstyleException | IOException ignored) {
              suppressionSourceExists = false;
          }
          return suppressionSourceExists;
      }
  
  }
  