///////////////////////////////////////////////////////////////////////////////////////////////
   // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
   // Copyright (C) 2001-2026 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.xpath;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.internal.utils.TestUtil.getExpectedThrowable;
  import static com.puppycrawl.tools.checkstyle.utils.XpathUtil.getXpathItems;
  
  import java.io.File;
  import java.util.List;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractPathTestSupport;
  import com.puppycrawl.tools.checkstyle.DetailAstImpl;
  import com.puppycrawl.tools.checkstyle.JavaParser;
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import net.sf.saxon.om.AxisInfo;
  import net.sf.saxon.om.NodeInfo;
  import net.sf.saxon.tree.iter.AxisIterator;
  import net.sf.saxon.tree.iter.EmptyIterator;
  
  public class RootNodeTest extends AbstractPathTestSupport {
  
      private static RootNode rootNode;
  
      @Override
      public String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/xpath/xpathmapper";
      }
  
      @BeforeEach
      public void init() throws Exception {
          final File file = new File(getPath("InputXpathMapperAst.java"));
          final DetailAST rootAst = JavaParser.parseFile(file, JavaParser.Options.WITHOUT_COMMENTS);
          rootNode = new RootNode(rootAst);
      }
  
      @Test
      public void testCompareOrder() {
          final UnsupportedOperationException exc =
                  getExpectedThrowable(UnsupportedOperationException.class, () -> {
                      rootNode.compareOrder(null);
                  });
          assertWithMessage("Invalid exception message")
              .that(exc.getMessage())
              .isEqualTo("Operation is not supported");
      }
  
      @Test
      public void testXpath() throws Exception {
          final String xpath = "/";
          final List<NodeInfo> nodes = getXpathItems(xpath, rootNode);
          assertWithMessage("Invalid number of nodes")
              .that(nodes)
              .hasSize(1);
          final NodeInfo firstNode = nodes.getFirst();
          assertWithMessage("Should return true, because selected node is RootNode")
                  .that(firstNode)
                  .isInstanceOf(RootNode.class);
          assertWithMessage("Result node should have same reference as expected")
              .that(rootNode)
              .isEqualTo(firstNode);
      }
  
      @Test
      public void testGetDepth() {
          assertWithMessage("Root node depth should be 0")
                  .that(rootNode.getDepth())
                  .isEqualTo(0);
      }
  
      @Test
      public void testGetTokenType() {
          assertWithMessage("Invalid token type")
              .that(rootNode.getTokenType())
              .isEqualTo(TokenTypes.COMPILATION_UNIT);
      }
  
      @Test
     public void testGetLineNumber() {
         assertWithMessage("Invalid line number")
             .that(rootNode.getLineNumber())
             .isEqualTo(1);
     }
 
     @Test
     public void testGetColumnNumber() {
         assertWithMessage("Invalid column number")
             .that(rootNode.getColumnNumber())
             .isEqualTo(0);
     }
 
     /*
      * This test exists to cover pitest mutation.
      * It is impossible to create RootNode that does not have column as 0.
      * Test exists until https://github.com/checkstyle/checkstyle/issues/4997
      */
     @Test
     public void testNonRealGetColumnNumber() {
         final DetailAstImpl nonRealNode = new DetailAstImpl();
         nonRealNode.setType(TokenTypes.PACKAGE_DEF);
         nonRealNode.setLineNo(555);
         nonRealNode.setColumnNo(888);
 
         final RootNode nonRealRootNode = new RootNode(nonRealNode);
         assertWithMessage("Invalid column number")
             .that(nonRealRootNode.getColumnNumber())
             .isEqualTo(888);
     }
 
     @Test
     public void testGetLocalPart() {
         assertWithMessage("Invalid local part")
             .that(rootNode.getLocalPart())
             .isEqualTo("ROOT");
     }
 
     @Test
     public void testIterate() {
         try (AxisIterator following = rootNode.iterateAxis(AxisInfo.FOLLOWING)) {
             assertWithMessage("Result iterator does not match expected")
                 .that(following)
                 .isEqualTo(EmptyIterator.ofNodes());
         }
         try (AxisIterator followingSibling = rootNode.iterateAxis(AxisInfo.FOLLOWING_SIBLING)) {
             assertWithMessage("Result iterator does not match expected")
                 .that(followingSibling)
                 .isEqualTo(EmptyIterator.ofNodes());
         }
         try (AxisIterator preceding = rootNode.iterateAxis(AxisInfo.PRECEDING)) {
             assertWithMessage("Result iterator does not match expected")
                 .that(preceding)
                 .isEqualTo(EmptyIterator.ofNodes());
         }
         try (AxisIterator precedingSibling = rootNode.iterateAxis(AxisInfo.PRECEDING_SIBLING)) {
             assertWithMessage("Result iterator does not match expected")
                 .that(precedingSibling)
                 .isEqualTo(EmptyIterator.ofNodes());
         }
         try (AxisIterator parent = rootNode.iterateAxis(AxisInfo.PARENT)) {
             assertWithMessage("Result iterator does not match expected")
                 .that(parent)
                 .isEqualTo(EmptyIterator.ofNodes());
         }
         try (AxisIterator parentNull = rootNode.iterateAxis(AxisInfo.PARENT, null)) {
             assertWithMessage("Result iterator does not match expected")
                 .that(parentNull)
                 .isEqualTo(EmptyIterator.ofNodes());
         }
     }
 
     @Test
     public void testRootWithNullDetailAst() {
         final RootNode emptyRootNode = new RootNode(null);
         assertWithMessage("Empty node should not have children")
                 .that(emptyRootNode.hasChildNodes())
                 .isFalse();
 
         try (AxisIterator iterator = emptyRootNode.iterateAxis(AxisInfo.DESCENDANT)) {
             assertWithMessage("Result iterator does not match expected")
                 .that(iterator)
                 .isEqualTo(EmptyIterator.ofNodes());
         }
         try (AxisIterator iterator = emptyRootNode.iterateAxis(AxisInfo.CHILD)) {
             assertWithMessage("Result iterator does not match expected")
                 .that(iterator)
                 .isEqualTo(EmptyIterator.ofNodes());
         }
     }
 
     @Test
     public void testGetStringValue() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::getStringValue);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetAttributeValue() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, () -> {
                     rootNode.getAttributeValue("", "");
                 });
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetDeclaredNamespaces() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, () -> {
                     rootNode.getDeclaredNamespaces(null);
                 });
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testIsId() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::isId);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testIsIdref() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::isIdref);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testIsNilled() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::isNilled);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testIsStreamed() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::isStreamed);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetConfiguration() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class,
                         rootNode::getConfiguration);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testSetSystemId() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, () -> {
                     rootNode.setSystemId("1");
                 });
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetSystemId() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::getSystemId);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetPublicId() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::getPublicId);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testBaseUri() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::getBaseURI);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testSaveLocation() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::saveLocation);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetStringValueCs() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class,
                         rootNode::getUnicodeStringValue);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testFingerprint() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::getFingerprint);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetDisplayName() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::getDisplayName);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetPrefix() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::getPrefix);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetSchemaType() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::getSchemaType);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testAtomize() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, rootNode::atomize);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGenerateId() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, () -> {
                     rootNode.generateId(null);
                 });
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testCopy() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class, () -> {
                     rootNode.copy(null, -1, null);
                 });
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testGetAllNamespaces() {
         final UnsupportedOperationException exc =
                 getExpectedThrowable(UnsupportedOperationException.class,
                         rootNode::getAllNamespaces);
         assertWithMessage("Invalid exception message")
             .that(exc.getMessage())
             .isEqualTo("Operation is not supported");
     }
 
     @Test
     public void testSameNodeInfo() {
         assertWithMessage("Should return true, because object is being compared to itself")
                 .that(rootNode.isSameNodeInfo(rootNode))
                 .isTrue();
         assertWithMessage("Should return false, because object does not equal null")
                 .that(rootNode.isSameNodeInfo(null))
                 .isFalse();
     }
 }