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.coding;
  
  import com.puppycrawl.tools.checkstyle.StatelessCheck;
  import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  import com.puppycrawl.tools.checkstyle.utils.ScopeUtil;
  
  /**
   * <p>
   * Checks if unnecessary semicolon is used after type declaration.
   * </p>
   * <p>
   * This check is not applicable to nested type declarations,
   * <a
   * href="https://checkstyle.org/checks/coding/unnecessarysemicolonaftertypememberdeclaration.html">
   * UnnecessarySemicolonAfterTypeMemberDeclaration</a> is responsible for it.
   * </p>
   * <ul>
   * <li>
   * Property {@code tokens} - tokens to check
   * Type is {@code java.lang.String[]}.
   * Validation type is {@code tokenSet}.
   * Default value is:
   * <a href="https://checkstyle.org/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html#CLASS_DEF">
   * CLASS_DEF</a>,
   * <a href="https://checkstyle.org/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html#INTERFACE_DEF">
   * INTERFACE_DEF</a>,
   * <a href="https://checkstyle.org/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html#ENUM_DEF">
   * ENUM_DEF</a>,
   * <a href="https://checkstyle.org/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html#ANNOTATION_DEF">
   * ANNOTATION_DEF</a>,
   * <a href="https://checkstyle.org/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html#RECORD_DEF">
   * RECORD_DEF</a>.
   * </li>
   * </ul>
   * <p>
   * To configure the check:
   * </p>
   * <pre>
   * &lt;module name=&quot;UnnecessarySemicolonAfterOuterTypeDeclaration&quot;/&gt;
   * </pre>
   * <p>Example:</p>
   * <pre>
   * class A {
   *
   *     class Nested {
   *
   *     }; // OK, nested type declarations are ignored
   *
   * }; // violation
   *
   * interface B {
   *
   * }; // violation
   *
   * enum C {
   *
   * }; // violation
   *
   * {@literal @}interface D {
   *
   * }; // violation
   * </pre>
   * <p>
   * To configure the check to detect unnecessary semicolon only after top level class definitions:
   * </p>
   * <pre>
   * &lt;module name=&quot;UnnecessarySemicolonAfterOuterTypeDeclaration&quot;&gt;
   *   &lt;property name=&quot;tokens&quot; value=&quot;CLASS_DEF&quot;/&gt;
   * &lt;/module&gt;
   * </pre>
   * <p>Example:</p>
   * <pre>
   * class A {
   *
   * }; // violation
   *
   * interface B {
   *
   * }; // OK
   *
   * enum C {
   *
   * }; // OK
   *
   * {@literal @}interface D {
   *
   * }; // OK
   * </pre>
   * <p>
   * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker}
   * </p>
   * <p>
   * Violation Message Keys:
   * </p>
   * <ul>
   * <li>
   * {@code unnecessary.semicolon}
   * </li>
   * </ul>
   *
   * @since 8.31
   */
  @StatelessCheck
  public final class UnnecessarySemicolonAfterOuterTypeDeclarationCheck extends AbstractCheck {
  
      /**
       * A key is pointing to the warning message text in "messages.properties"
       * file.
       */
      public static final String MSG_SEMI = "unnecessary.semicolon";
  
      @Override
      public int[] getDefaultTokens() {
          return getAcceptableTokens();
      }
  
      @Override
      public int[] getAcceptableTokens() {
          return new int[] {
              TokenTypes.CLASS_DEF,
              TokenTypes.INTERFACE_DEF,
              TokenTypes.ENUM_DEF,
              TokenTypes.ANNOTATION_DEF,
              TokenTypes.RECORD_DEF,
          };
      }
  
      @Override
      public int[] getRequiredTokens() {
          return CommonUtil.EMPTY_INT_ARRAY;
      }
  
      @Override
      public void visitToken(DetailAST ast) {
          final DetailAST nextSibling = ast.getNextSibling();
          if (nextSibling != null
                  && ScopeUtil.isOuterMostType(ast)
                  && nextSibling.getType() == TokenTypes.SEMI) {
              log(nextSibling, MSG_SEMI);
          }
      }
  }
  