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.checks.naming;
  
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  
  /**
   * <p>
   * Checks that record component names conform to a specified pattern.
   * </p>
   * <ul>
   * <li>
   * Property {@code format} - Specifies valid identifiers.
   * Type is {@code java.util.regex.Pattern}.
   * Default value is {@code "^[a-z][a-zA-Z0-9]*$"}.
   * </li>
   * </ul>
   * <p>
   * To configure the check:
   * </p>
   * <pre>
   * &lt;module name="RecordComponentName"/&gt;
   * </pre>
   * <p>Example:</p>
   * <pre>
   * record MyRecord1(String value, int otherComponentName) {} // OK
   * record MyRecord2(String... Values) {} // violation, the record component name
   *                                     // should match the regular expression "^[a-z][a-zA-Z0-9]*$"
   * record MyRecord3(double my_number) {} // violation, the record component name
   *                                     // should match the regular expression "^[a-z][a-zA-Z0-9]*$"
   * </pre>
   * <p>
   * An example of how to configure the check for names that are only letters in lowercase:
   * </p>
   * <p>Configuration:</p>
   * <pre>
   * &lt;module name="RecordComponentName"&gt;
   *   &lt;property name="format" value="^[a-z]+$"/&gt;
   * &lt;/module&gt;
   * </pre>
   * <p>Example:</p>
   * <pre>
   * record MyRecord1(String value, int other) {} // OK
   * record MyRecord2(String... strings) {} // OK
   * record MyRecord3(double myNumber) {} // violation, the record component name
   *                              // should match the regular expression "^[a-z]+$"
   * </pre>
   * <p>
   * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker}
   * </p>
   * <p>
   * Violation Message Keys:
   * </p>
   * <ul>
   * <li>
   * {@code name.invalidPattern}
   * </li>
   * </ul>
   *
   * @since 8.40
   */
  public class RecordComponentNameCheck extends AbstractNameCheck {
  
      /** Creates a new {@code RecordComponentNameCheck} instance. */
      public RecordComponentNameCheck() {
          super("^[a-z][a-zA-Z0-9]*$");
      }
  
      @Override
      public int[] getDefaultTokens() {
          return getRequiredTokens();
      }
  
      @Override
      public final int[] getAcceptableTokens() {
          return getRequiredTokens();
      }
  
      @Override
      public int[] getRequiredTokens() {
          return new int[] {
              TokenTypes.RECORD_COMPONENT_DEF,
          };
      }
  
      @Override
      protected final boolean mustCheckName(DetailAST ast) {
          return true;
      }
  
  }
  