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 com.puppycrawl.tools.checkstyle.AbstractAutomaticBean;
  import com.puppycrawl.tools.checkstyle.api.AuditEvent;
  import com.puppycrawl.tools.checkstyle.api.Filter;
  import com.puppycrawl.tools.checkstyle.api.SeverityLevel;
  
  /**
   * <p>
   * Filter {@code SeverityMatchFilter} decides audit events according to the
   * <a href="https://checkstyle.org/config.html#Severity">severity level</a> of the event.
   * </p>
   * <p>
   * SeverityMatchFilter can suppress Checks that have Treewalker or Checker as parent module.
   * </p>
   * <ul>
   * <li>
   * Property {@code severity} - Specify the severity level of this filter.
   * Type is {@code com.puppycrawl.tools.checkstyle.api.SeverityLevel}.
   * Default value is {@code error}.
   * </li>
   * <li>
   * Property {@code acceptOnMatch} - Control whether the filter accepts an audit
   * event if and only if there is a match between the event's severity level and
   * property severity. If acceptOnMatch is {@code false}, then the filter accepts
   * an audit event if and only if there is not a match between the event's severity
   * level and property severity.
   * Type is {@code boolean}.
   * Default value is {@code true}.
   * </li>
   * </ul>
   * <p>
   * For example, the following configuration fragment directs the Checker to not
   * report audit events with severity level {@code info}:
   * </p>
   * <pre>
   * &lt;module name=&quot;SeverityMatchFilter&quot;&gt;
   *   &lt;property name=&quot;severity&quot; value=&quot;info&quot;/&gt;
   *   &lt;property name=&quot;acceptOnMatch&quot; value=&quot;false&quot;/&gt;
   * &lt;/module&gt;
   * </pre>
   * <p>
   * Parent is {@code com.puppycrawl.tools.checkstyle.Checker}
   * </p>
   *
   * @since 3.2
   */
  public class SeverityMatchFilter
      extends AbstractAutomaticBean
      implements Filter {
  
      /** Specify the severity level of this filter. */
      private SeverityLevel severity = SeverityLevel.ERROR;
  
      /**
       * Control whether the filter accepts an audit event if and only if there
       * is a match between the event's severity level and property severity.
       * If acceptOnMatch is {@code false}, then the filter accepts an audit event
       * if and only if there is not a match between the event's severity level
       * and property severity.
       */
      private boolean acceptOnMatch = true;
  
      /**
       * Setter to specify the severity level of this filter.
       *
       * @param severity  The new severity level
       * @see SeverityLevel
       */
      public final void setSeverity(SeverityLevel severity) {
          this.severity = severity;
      }
  
      /**
       * Setter to control whether the filter accepts an audit event if and only if there
       * is a match between the event's severity level and property severity.
       * If acceptOnMatch is {@code false}, then the filter accepts an audit event
       * if and only if there is not a match between the event's severity level and property severity.
       *
       * @param acceptOnMatch if true, accept on matches; if
       *     false, reject on matches.
       */
      public final void setAcceptOnMatch(boolean acceptOnMatch) {
          this.acceptOnMatch = acceptOnMatch;
      }
  
      @Override
      protected void finishLocalSetup() {
          // No code by default
      }
  
      @Override
      public boolean accept(AuditEvent event) {
          final boolean severityMatches = severity == event.getSeverityLevel();
          return acceptOnMatch == severityMatches;
      }
  
  }
  