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.whitespace;
  
  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.TokenUtil;
  
  /**
   * <p>Checks that chosen statements are not line-wrapped.
   * By default, this Check restricts wrapping import and package statements,
   * but it's possible to check any statement.
   * </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#PACKAGE_DEF">
   * PACKAGE_DEF</a>,
   * <a href="https://checkstyle.org/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html#IMPORT">
   * IMPORT</a>,
   * <a href="https://checkstyle.org/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html#STATIC_IMPORT">
   * STATIC_IMPORT</a>.
   * </li>
   * </ul>
   * <p>
   * To configure the check to force no line-wrapping
   * in package and import statements (default values):
   * </p>
   * <pre>
   * &lt;module name=&quot;NoLineWrap&quot;/&gt;
   * </pre>
   * <p>Examples of line-wrapped statements (bad case):
   * </p>
   * <pre>
   * package com.puppycrawl. // violation
   *     tools.checkstyle.checks;
   *
   * import com.puppycrawl.tools. // violation
   *     checkstyle.api.AbstractCheck;
   *
   * import static java.math. // violation
   *     BigInteger.ZERO;
   * </pre>
   *
   * <p>
   * Examples:
   * </p>
   * <pre>
   * package com.puppycrawl.tools.checkstyle. // violation
   *   checks.whitespace;
   *
   * import java.lang.Object; // OK
   * import java.lang. // violation
   *   Integer;
   *
   * import static java.math. // violation
   *   BigInteger.TEN;
   * </pre>
   * <pre>
   * package com.puppycrawl.tools.checkstyle.checks.coding; // OK
   *
   * import java.lang. // violation
   *   Boolean;
   *
   * import static java.math.BigInteger.ONE; // OK
   * </pre>
   *
   * <p>
   * To configure the check to force no line-wrapping only
   * in import statements:
   * </p>
   * <pre>
   * &lt;module name=&quot;NoLineWrap&quot;&gt;
   *   &lt;property name="tokens" value="IMPORT"/&gt;
   * &lt;/module&gt;
   * </pre>
   * <p>
   * Example:
   * </p>
   * <pre>
   * package com.puppycrawl. // OK
   *   tools.checkstyle.checks;
   *
   * import java.io.*; // OK
   * import java.lang. // violation
   *  Boolean;
   *
   * import static java.math. // OK
   * BigInteger.ZERO;
   * </pre>
   * <p>
   * To configure the check to force no line-wrapping only
   * in class, method and constructor definitions:
   * </p>
   * <pre>
   * &lt;module name=&quot;NoLineWrap&quot;&gt;
   *   &lt;property name="tokens" value="CLASS_DEF, METHOD_DEF, CTOR_DEF"/&gt;
   * &lt;/module&gt;
   * </pre>
   * <p>
   * Example:
   * </p>
   * <pre>
   * public class // violation, class definition not wrapped in a single-line
   *   Foo {
   *
   *   public Foo() { // OK
   *   }
   *
   *   public static void // violation, method definition not wrapped in a single-line
   *     doSomething() {
   *   }
   * }
   *
   * public class Bar { // OK
   *
   *   public // violation, constructor definition not wrapped in a single-line
   *     Bar() {
   *   }
   *
   *   public int fun() { // OK
   *   }
   * }
   * </pre>
   *
   * <p>Examples of not line-wrapped statements (good case):
   * </p>
   * <pre>
   * import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
   * import static java.math.BigInteger.ZERO;
   * </pre>
   * <p>
   * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker}
   * </p>
   * <p>
   * Violation Message Keys:
   * </p>
   * <ul>
   * <li>
   * {@code no.line.wrap}
   * </li>
   * </ul>
   *
   * @since 5.8
   */
  @StatelessCheck
  public class NoLineWrapCheck extends AbstractCheck {
  
      /**
       * A key is pointing to the warning message text in "messages.properties"
       * file.
       */
      public static final String MSG_KEY = "no.line.wrap";
  
      @Override
      public int[] getDefaultTokens() {
          return new int[] {TokenTypes.PACKAGE_DEF, TokenTypes.IMPORT, TokenTypes.STATIC_IMPORT};
      }
  
      @Override
      public int[] getAcceptableTokens() {
          return new int[] {
              TokenTypes.IMPORT,
              TokenTypes.STATIC_IMPORT,
              TokenTypes.PACKAGE_DEF,
              TokenTypes.CLASS_DEF,
              TokenTypes.METHOD_DEF,
              TokenTypes.CTOR_DEF,
              TokenTypes.ENUM_DEF,
              TokenTypes.INTERFACE_DEF,
              TokenTypes.RECORD_DEF,
              TokenTypes.COMPACT_CTOR_DEF,
          };
      }
  
      @Override
      public int[] getRequiredTokens() {
          return CommonUtil.EMPTY_INT_ARRAY;
      }
  
      @Override
      public void visitToken(DetailAST ast) {
          if (!TokenUtil.areOnSameLine(ast, ast.getLastChild())) {
              log(ast, MSG_KEY, ast.getText());
          }
      }
  
  }
  