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.gui;
  
  import java.awt.Color;
  import java.util.ArrayList;
  import java.util.Collection;
  
  import javax.swing.JTextArea;
  
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.DetailNode;
  
  /**
   * Helper class to select a code.
   */
  public class CodeSelector {
  
      /** Editor. */
      private final JTextArea editor;
      /** Presentation model. */
      private final CodeSelectorPresentation pModel;
  
      /**
       * Constructor.
       *
       * @param node ast node.
       * @param editor text area editor.
       * @param lines2position positions of lines.
       */
      public CodeSelector(final Object node, final JTextArea editor,
                          final Collection<Integer> lines2position) {
          this.editor = editor;
          if (node instanceof DetailAST) {
              pModel = new CodeSelectorPresentation((DetailAST) node,
                      new ArrayList<>(lines2position));
          }
          else {
              pModel = new CodeSelectorPresentation((DetailNode) node,
                      new ArrayList<>(lines2position));
          }
      }
  
      /**
       * Set selection.
       */
      public void select() {
          pModel.findSelectionPositions();
          editor.setSelectedTextColor(Color.blue);
          editor.requestFocusInWindow();
          editor.setCaretPosition(pModel.getSelectionStart());
          editor.moveCaretPosition(pModel.getSelectionEnd());
      }
  
  }
  