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;
  import com.puppycrawl.tools.checkstyle.utils.ScopeUtil;
  
  /**
   * <p>
   * Checks that {@code static}, non-{@code final} variable 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]*$"}.
   * </li>
   * <li>
   * Property {@code applyToPublic} - Controls whether to apply the check to public member.
   * Type is {@code boolean}.
   * Default value is {@code true}.
   * </li>
   * <li>
   * Property {@code applyToProtected} - Controls whether to apply the check to protected member.
   * Type is {@code boolean}.
   * Default value is {@code true}.
   * </li>
   * <li>
   * Property {@code applyToPackage} - Controls whether to apply the check to package-private member.
   * Type is {@code boolean}.
   * Default value is {@code true}.
   * </li>
   * <li>
   * Property {@code applyToPrivate} - Controls whether to apply the check to private member.
   * Type is {@code boolean}.
   * Default value is {@code true}.
   * </li>
   * </ul>
   * <p>
   * To configure the check:
   * </p>
   * <pre>
   * &lt;module name=&quot;StaticVariableName&quot;/&gt;
   * </pre>
   * <p>Code Example:</p>
   * <pre>
   * class MyClass {
   *   public static int goodStatic = 2; // OK
   *   private static int BadStatic = 2; // violation, name 'BadStatic'
   *                                     // must match pattern '^[a-z][a-zA-Z0-9]*$'
   * }
   * </pre>
   * <p>
   * An example of how to suppress the check to public and protected types is:
   * </p>
   * <pre>
   * &lt;module name=&quot;StaticVariableName&quot;&gt;
   *   &lt;property name=&quot;applyToPublic&quot; value=&quot;false&quot;/&gt;
   *   &lt;property name=&quot;applyToProtected&quot; value=&quot;false&quot;/&gt;
   * &lt;/module&gt;
   * </pre>
   * <p>Code Example:</p>
   * <pre>
   * class MyClass {
   *   public static int GoodStatic1 = 2; // OK
   *   protected static int GoodStatic2 = 2; //OK
   *   private static int goodStatic = 2 // OK
   *   private static int BadStatic = 2; // violation, name 'BadStatic'
   *                                     // must match pattern '^[a-z][a-zA-Z0-9]*$'
   * }
   * </pre>
   * <p>
   * An example of how to configure the check for names that begin with
   * a lower case letter, followed by letters, digits, and underscores.
   * Also, suppress the check from being applied to private and package-private types:
   * </p>
   * <pre>
   * &lt;module name=&quot;StaticVariableName&quot;&gt;
   *   &lt;property name=&quot;format&quot; value=&quot;^[a-z](_?[a-zA-Z0-9]+)*$&quot;/&gt;
   *   &lt;property name=&quot;applyToPrivate&quot; value=&quot;false&quot;/&gt;
   *   &lt;property name=&quot;applyToPackage&quot; value=&quot;false&quot;/&gt;
   * &lt;/module&gt;
   * </pre>
   * <p>Code Example:</p>
   * <pre>
   * class MyClass {
   *   public static int good_static = 2; // OK
   *   public static int Bad_Static = 2; // violation, name 'Bad_Static'
   *                                     // must match pattern '^[a-z](_?[a-zA-Z0-9]+)*$'
   *   private static int Good_Static1 = 2; // OK
   *   static int Good_Static2 = 2; // OK
   * }
   * </pre>
   * <p>
   * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker}
   * </p>
   * <p>
   * Violation Message Keys:
   * </p>
   * <ul>
   * <li>
   * {@code name.invalidPattern}
   * </li>
   * </ul>
   *
   * @since 3.0
   */
  public class StaticVariableNameCheck
      extends AbstractAccessControlNameCheck {
  
      /** Creates a new {@code StaticVariableNameCheck} instance. */
      public StaticVariableNameCheck() {
          super("^[a-z][a-zA-Z0-9]*$");
      }
  
      @Override
      public int[] getDefaultTokens() {
          return getRequiredTokens();
      }
  
      @Override
      public int[] getAcceptableTokens() {
          return getRequiredTokens();
      }
  
      @Override
      public int[] getRequiredTokens() {
          return new int[] {TokenTypes.VARIABLE_DEF};
      }
  
      @Override
      protected final boolean mustCheckName(DetailAST ast) {
          final DetailAST modifiersAST =
              ast.findFirstToken(TokenTypes.MODIFIERS);
          final boolean isStatic = modifiersAST.findFirstToken(TokenTypes.LITERAL_STATIC) != null;
          final boolean isFinal = modifiersAST.findFirstToken(TokenTypes.FINAL) != null;
  
          return isStatic
                  && !isFinal
                  && shouldCheckInScope(modifiersAST)
                  && !ScopeUtil.isInInterfaceOrAnnotationBlock(ast);
      }
  
  }
  