///////////////////////////////////////////////////////////////////////////////////////////////
   // 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.checks.javadoc;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  import java.util.ListIterator;
  import java.util.Optional;
  import java.util.Set;
  
  import com.puppycrawl.tools.checkstyle.FileStatefulCheck;
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.DetailNode;
  import com.puppycrawl.tools.checkstyle.api.FullIdent;
  import com.puppycrawl.tools.checkstyle.api.JavadocCommentsTokenTypes;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.checks.naming.AccessModifierOption;
  import com.puppycrawl.tools.checkstyle.utils.AnnotationUtil;
  import com.puppycrawl.tools.checkstyle.utils.CheckUtil;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  import com.puppycrawl.tools.checkstyle.utils.JavadocUtil;
  import com.puppycrawl.tools.checkstyle.utils.UnmodifiableCollectionUtil;
  
  /**
   * <div>
   * Checks the Javadoc of a method or constructor.
   * </div>
   *
   * <p>
   * Violates parameters and type parameters for which no param tags are present can
   * be suppressed by defining property {@code allowMissingParamTags}.
   * </p>
   *
   * <p>
   * Violates methods which return non-void but for which no return tag is present can
   * be suppressed by defining property {@code allowMissingReturnTag}.
   * </p>
   *
   * <p>
   * Violates exceptions which are declared to be thrown (by {@code throws} in the method
   * signature or by {@code throw new} in the method body), but for which no throws tag is
   * present by activation of property {@code validateThrows}.
   * Note that {@code throw new} is not checked in the following places:
   * </p>
   * <ul>
   * <li>
   * Inside a try block (with catch). It is not possible to determine if the thrown
   * exception can be caught by the catch block as there is no knowledge of the
   * inheritance hierarchy, so the try block is ignored entirely. However, catch
   * and finally blocks, as well as try blocks without catch, are still checked.
   * </li>
   * <li>
   * Local classes, anonymous classes and lambda expressions. It is not known when the
   * throw statements inside such classes are going to be evaluated, so they are ignored.
   * </li>
   * </ul>
   *
   * <p>
   * ATTENTION: Checkstyle does not have information about hierarchy of exception types
   * so usage of base class is considered as separate exception type.
   * As workaround, you need to specify both types in javadoc (parent and exact type).
   * </p>
   *
   * <p>
   * Javadoc is not required on a method that is tagged with the {@code @Override}
   * annotation. However, under Java 5 it is not possible to mark a method required
   * for an interface (this was <i>corrected</i> under Java 6). Hence, Checkstyle
   * supports using the convention of using a single {@code {@inheritDoc}} tag
   * instead of all the other tags.
   * </p>
   *
   * <p>
   * Note that only inheritable items will allow the {@code {@inheritDoc}}
   * tag to be used in place of comments. Static methods at all visibilities,
   * private non-static methods and constructors are not inheritable.
   * </p>
   *
   * <p>
   * For example, if the following method is implementing a method required by
  * an interface, then the Javadoc could be done as:
  * </p>
  * <div class="wrapper"><pre class="prettyprint"><code class="language-java">
  * &#47;** {&#64;inheritDoc} *&#47;
  * public int checkReturnTag(final int aTagIndex,
  *                           JavadocTag[] aTags,
  *                           int aLineNo)
  * </code></pre></div>
  *
  * @since 3.0
  */
 @FileStatefulCheck
 public class JavadocMethodCheck extends AbstractJavadocCheck {
 
     /**
      * A key is pointing to the warning message text in "messages.properties"
      * file.
      */
     public static final String MSG_CLASS_INFO = "javadoc.classInfo";
 
     /**
      * A key is pointing to the warning message text in "messages.properties"
      * file.
      */
     public static final String MSG_UNUSED_TAG_GENERAL = "javadoc.unusedTagGeneral";
 
     /**
      * A key is pointing to the warning message text in "messages.properties"
      * file.
      */
     public static final String MSG_INVALID_INHERIT_DOC = "javadoc.invalidInheritDoc";
 
     /**
      * A key is pointing to the warning message text in "messages.properties"
      * file.
      */
     public static final String MSG_UNUSED_TAG = "javadoc.unusedTag";
 
     /**
      * A key is pointing to the warning message text in "messages.properties"
      * file.
      */
     public static final String MSG_EXPECTED_TAG = "javadoc.expectedTag";
 
     /**
      * A key is pointing to the warning message text in "messages.properties"
      * file.
      */
     public static final String MSG_RETURN_EXPECTED = "javadoc.return.expected";
 
     /**
      * A key is pointing to the warning message text in "messages.properties"
      * file.
      */
     public static final String MSG_DUPLICATE_TAG = "javadoc.duplicateTag";
 
     /** Html element start symbol. */
     private static final String ELEMENT_START = "<";
 
     /** Html element end symbol. */
     private static final String ELEMENT_END = ">";
 
     /** Javadoc tags collected from the current Javadoc tree. */
     private final List<JavadocTag> javadocTags = new ArrayList<>();
 
     /**
      * Control whether to allow inline return tags.
      */
     private boolean allowInlineReturn;
 
     /** Specify the access modifiers where Javadoc comments are checked. */
     private AccessModifierOption[] accessModifiers = {
         AccessModifierOption.PUBLIC,
         AccessModifierOption.PROTECTED,
         AccessModifierOption.PACKAGE,
         AccessModifierOption.PRIVATE,
     };
 
     /**
      * Control whether to validate {@code throws} tags.
      */
     private boolean validateThrows;
 
     /**
      * Control whether to ignore violations when a method has parameters but does
      * not have matching {@code param} tags in the javadoc.
      */
     private boolean allowMissingParamTags;
 
     /**
      * Control whether to ignore violations when a method returns non-void type
      * and does not have a {@code return} tag in the javadoc.
      */
     private boolean allowMissingReturnTag;
 
     /** Specify annotations that allow missed documentation. */
     private Set<String> allowedAnnotations = Set.of("Override");
 
     /** Java AST node whose attached Javadoc is currently being processed. */
     private DetailAST currentAst;
 
     /**
      * Creates a new {@code JavadocMethodCheck} instance.
      */
     public JavadocMethodCheck() {
         // no code by default
     }
 
     /**
      * Setter to control whether to allow inline return tags.
      *
      * @param value a {@code boolean} value
      * @since 10.23.0
      */
     public void setAllowInlineReturn(boolean value) {
         allowInlineReturn = value;
     }
 
     /**
      * Setter to control whether to validate {@code throws} tags.
      *
      * @param value user's value.
      * @since 6.0
      */
     public void setValidateThrows(boolean value) {
         validateThrows = value;
     }
 
     /**
      * Setter to specify annotations that allow missed documentation.
      *
      * @param userAnnotations user's value.
      * @since 6.0
      */
     public void setAllowedAnnotations(String... userAnnotations) {
         allowedAnnotations = Set.of(userAnnotations);
     }
 
     /**
      * Setter to specify the access modifiers where Javadoc comments are checked.
      *
      * @param accessModifiers access modifiers.
      * @since 8.42
      */
     public void setAccessModifiers(AccessModifierOption... accessModifiers) {
         this.accessModifiers =
             UnmodifiableCollectionUtil.copyOfArray(accessModifiers, accessModifiers.length);
     }
 
     /**
      * Setter to control whether to ignore violations when a method has parameters
      * but does not have matching {@code param} tags in the javadoc.
      *
      * @param flag a {@code Boolean} value
      * @since 3.1
      */
     public void setAllowMissingParamTags(boolean flag) {
         allowMissingParamTags = flag;
     }
 
     /**
      * Setter to control whether to ignore violations when a method returns non-void type
      * and does not have a {@code return} tag in the javadoc.
      *
      * @param flag a {@code Boolean} value
      * @since 3.1
      */
     public void setAllowMissingReturnTag(boolean flag) {
         allowMissingReturnTag = flag;
     }
 
     /**
      * Setter to control when to print violations if the Javadoc being examined by this check
      * violates the tight html rules defined at
      * <a href="https://checkstyle.org/writingjavadocchecks.html#Tight-HTML_rules">
      *     Tight-HTML Rules</a>.
      *
      * @param shouldReportViolation value to which the field shall be set to
      * @since 8.3
      * @propertySince 13.7.0
      */
     @Override
     public void setViolateExecutionOnNonTightHtml(boolean shouldReportViolation) {
         super.setViolateExecutionOnNonTightHtml(shouldReportViolation);
     }
 
     @Override
     public final int[] getRequiredTokens() {
         return CommonUtil.EMPTY_INT_ARRAY;
     }
 
     @Override
     public int[] getDefaultTokens() {
         return getAcceptableTokens();
     }
 
     @Override
     public int[] getAcceptableTokens() {
         return new int[] {
             TokenTypes.METHOD_DEF,
             TokenTypes.CTOR_DEF,
             TokenTypes.ANNOTATION_FIELD_DEF,
             TokenTypes.COMPACT_CTOR_DEF,
         };
     }
 
     @Override
     public final void visitToken(DetailAST ast) {
         if (shouldCheck(ast)) {
             final DetailAST blockCommentNode = JavadocUtil.getAttachedJavadocComment(ast);
             if (blockCommentNode != null) {
                 currentAst = ast;
                 super.visitToken(blockCommentNode);
             }
         }
     }
 
     @Override
     public void beginJavadocTree(DetailNode rootAst) {
         javadocTags.clear();
     }
 
     @Override
     public void finishJavadocTree(DetailNode rootAst) {
         checkCollectedTags();
     }
 
     @Override
     public int[] getDefaultJavadocTokens() {
         return getRequiredJavadocTokens();
     }
 
     @Override
     public int[] getRequiredJavadocTokens() {
         return new int[] {
             JavadocCommentsTokenTypes.PARAM_BLOCK_TAG,
             JavadocCommentsTokenTypes.RETURN_BLOCK_TAG,
             JavadocCommentsTokenTypes.RETURN_INLINE_TAG,
             JavadocCommentsTokenTypes.THROWS_BLOCK_TAG,
             JavadocCommentsTokenTypes.EXCEPTION_BLOCK_TAG,
             JavadocCommentsTokenTypes.INHERIT_DOC_INLINE_TAG,
         };
     }
 
     @Override
     public void visitJavadocToken(DetailNode ast) {
         switch (ast.getType()) {
             case JavadocCommentsTokenTypes.RETURN_BLOCK_TAG -> collectReturn(ast);
             case JavadocCommentsTokenTypes.RETURN_INLINE_TAG -> {
                 if (allowInlineReturn) {
                     collectReturn(ast);
                 }
             }
             case JavadocCommentsTokenTypes.INHERIT_DOC_INLINE_TAG -> collectInheritDoc();
             case JavadocCommentsTokenTypes.PARAM_BLOCK_TAG -> collectParam(ast);
             case JavadocCommentsTokenTypes.THROWS_BLOCK_TAG -> collectThrows(ast, "throws");
             case JavadocCommentsTokenTypes.EXCEPTION_BLOCK_TAG -> collectThrows(ast, "exception");
             default -> throw new IllegalArgumentException("Unknown javadoc token type " + ast);
         }
     }
 
     /**
      * Collects a return tag if it has a description.
      *
      * @param ast the return tag node
      */
     private void collectReturn(DetailNode ast) {
         if (JavadocUtil.findFirstToken(ast, JavadocCommentsTokenTypes.DESCRIPTION) != null) {
             javadocTags.add(new JavadocTag(ast.getLineNumber(), ast.getColumnNumber(), "return"));
         }
     }
 
     /**
      * Collects an inheritDoc tag.
      */
     private void collectInheritDoc() {
         javadocTags.add(new JavadocTag(0, 0, "inheritDoc"));
     }
 
     /**
      * Collects a param tag.
      *
      * @param ast the param tag node
      */
     private void collectParam(DetailNode ast) {
         final DetailNode parameterName = JavadocUtil.findFirstToken(
                 ast, JavadocCommentsTokenTypes.PARAMETER_NAME);
         if (parameterName != null) {
             javadocTags.add(new JavadocTag(ast.getLineNumber(), ast.getColumnNumber(),
                     "param", parameterName.getText()));
         }
     }
 
     /**
      * Collects a throws or exception tag.
      *
      * @param ast the throws or exception tag node
      * @param tagName the tag name
      */
     private void collectThrows(DetailNode ast, String tagName) {
         final DetailNode identifier = JavadocUtil.findFirstToken(
                 ast, JavadocCommentsTokenTypes.IDENTIFIER);
         if (identifier != null) {
             javadocTags.add(new JavadocTag(0, 0,
                     tagName, identifier.getText()));
         }
     }
 
     /**
      * Checks collected Javadoc tags against the current AST node.
      */
     private void checkCollectedTags() {
         final List<JavadocTag> tagsToCheck = new ArrayList<>(javadocTags);
         if (!hasShortCircuitTag(currentAst, tagsToCheck)) {
             if (currentAst.getType() == TokenTypes.ANNOTATION_FIELD_DEF) {
                 checkReturnTag(tagsToCheck, currentAst.getLineNo(), true);
             }
             else {
                 boolean hasInheritDocTag = false;
                 final Iterator<JavadocTag> iterator = tagsToCheck.iterator();
                 while (!hasInheritDocTag && iterator.hasNext()) {
                     hasInheritDocTag = iterator.next().isInheritDocTag();
                 }
                 final boolean reportExpectedTags = !hasInheritDocTag
                         && !AnnotationUtil.containsAnnotation(currentAst, allowedAnnotations);
                 if (currentAst.getType() == TokenTypes.COMPACT_CTOR_DEF) {
                     checkRecordParamTags(tagsToCheck, currentAst, reportExpectedTags);
                 }
                 else {
                     checkParamTags(tagsToCheck, currentAst, reportExpectedTags);
                 }
                 final List<ExceptionInfo> thrown =
                         combineExceptionInfo(getThrows(currentAst), getThrowed(currentAst));
                 checkThrowsTags(tagsToCheck, thrown, reportExpectedTags);
                 if (CheckUtil.isNonVoidMethod(currentAst)) {
                     checkReturnTag(tagsToCheck, currentAst.getLineNo(), reportExpectedTags);
                 }
             }
         }
         tagsToCheck.stream()
                 .filter(javadocTag -> !javadocTag.isInheritDocTag())
                 .forEach(javadocTag -> log(javadocTag.getLineNo(), MSG_UNUSED_TAG_GENERAL));
     }
 
     /**
      * Checks whether the given declaration should be validated.
      *
      * <p>The declaration is checked only when both its own access modifier and the
      * access modifier of the surrounding type match the configured
      * {@code accessModifiers}.</p>
      *
      * @param ast the method, constructor, annotation field, or compact constructor
      *        AST node to check
      * @return {@code true} if the declaration is inside the configured access scope
      */
     private boolean shouldCheck(final DetailAST ast) {
         final Optional<AccessModifierOption> surroundingAccessModifier = CheckUtil
                 .getSurroundingAccessModifier(ast);
         final AccessModifierOption accessModifier = CheckUtil
                 .getAccessModifierFromModifiersToken(ast);
         return surroundingAccessModifier.isPresent() && Arrays.stream(accessModifiers)
                         .anyMatch(modifier -> modifier == surroundingAccessModifier.get())
                 && Arrays.stream(accessModifiers).anyMatch(modifier -> modifier == accessModifier);
     }
 
     /**
      * Retrieves the list of record components from a given record definition.
      *
      * @param recordDef the AST node representing the record definition
      * @return a list of AST nodes representing the record components
      */
     private static List<DetailAST> getRecordComponents(final DetailAST recordDef) {
         final List<DetailAST> components = new ArrayList<>();
         final DetailAST recordDecl = recordDef.findFirstToken(TokenTypes.RECORD_COMPONENTS);
 
         DetailAST child = recordDecl.getFirstChild();
         while (child != null) {
             if (child.getType() == TokenTypes.RECORD_COMPONENT_DEF) {
                 components.add(child.findFirstToken(TokenTypes.IDENT));
             }
             child = child.getNextSibling();
         }
         return components;
     }
 
     /**
      * Finds the nearest ancestor record definition node for the given AST node.
      *
      * @param ast the AST node to start searching from
      * @return the nearest {@code RECORD_DEF} AST node, or {@code null} if not found
      */
     private static DetailAST getRecordDef(DetailAST ast) {
         DetailAST current = ast;
         while (current.getType() != TokenTypes.RECORD_DEF) {
             current = current.getParent();
         }
         return current;
     }
 
     /**
      * Validates whether the Javadoc has a short circuit tag. Currently, this is
      * the inheritTag. Any violations are logged.
      *
      * @param ast the construct being checked
      * @param tags the list of Javadoc tags associated with the construct
      * @return true if the construct has a short circuit tag.
      */
     private boolean hasShortCircuitTag(final DetailAST ast, final List<JavadocTag> tags) {
         boolean result = true;
         // Check if it contains {@inheritDoc} tag
         if (tags.size() == 1
                 && tags.getFirst().isInheritDocTag()) {
             // Invalid if private, a constructor, or a static method
             if (!JavadocTagInfo.INHERIT_DOC.isValidOn(ast)) {
                 log(ast, MSG_INVALID_INHERIT_DOC);
             }
         }
         else {
             result = false;
         }
         return result;
     }
 
     /**
      * Computes the parameter nodes for a method.
      *
      * @param ast the method node.
      * @return the list of parameter nodes for ast.
      */
     private static List<DetailAST> getParameters(DetailAST ast) {
         final DetailAST params = ast.findFirstToken(TokenTypes.PARAMETERS);
         final List<DetailAST> returnValue = new ArrayList<>();
 
         DetailAST child = params.getFirstChild();
         while (child != null) {
             final DetailAST ident = child.findFirstToken(TokenTypes.IDENT);
             if (ident != null) {
                 returnValue.add(ident);
             }
             child = child.getNextSibling();
         }
         return returnValue;
     }
 
     /**
      * Computes the exception nodes for a method.
      *
      * @param ast the method node.
      * @return the list of exception nodes for ast.
      */
     private static List<ExceptionInfo> getThrows(DetailAST ast) {
         final List<ExceptionInfo> returnValue = new ArrayList<>();
         final DetailAST throwsAST = ast
                 .findFirstToken(TokenTypes.LITERAL_THROWS);
         if (throwsAST != null) {
             DetailAST child = throwsAST.getFirstChild();
             while (child != null) {
                 if (child.getType() == TokenTypes.IDENT
                         || child.getType() == TokenTypes.DOT) {
                     returnValue.add(getExceptionInfo(child));
                 }
                 child = child.getNextSibling();
             }
         }
         return returnValue;
     }
 
     /**
      * Get ExceptionInfo for all exceptions that throws in method code by 'throw new'.
      *
      * @param methodAst method DetailAST object where to find exceptions
      * @return list of ExceptionInfo
      */
     private static List<ExceptionInfo> getThrowed(DetailAST methodAst) {
         final List<ExceptionInfo> returnValue = new ArrayList<>();
         final List<DetailAST> throwLiterals = findTokensInAstByType(methodAst,
                     TokenTypes.LITERAL_THROW);
         for (DetailAST throwAst : throwLiterals) {
             if (!isInIgnoreBlock(methodAst, throwAst)) {
                 final DetailAST newAst = throwAst.getFirstChild().getFirstChild();
                 if (newAst.getType() == TokenTypes.LITERAL_NEW) {
                     final DetailAST child = newAst.getFirstChild();
                     returnValue.add(getExceptionInfo(child));
                 }
             }
         }
         return returnValue;
     }
 
     /**
      * Get ExceptionInfo instance.
      *
      * @param ast DetailAST object where to find exceptions node;
      * @return ExceptionInfo
      */
     private static ExceptionInfo getExceptionInfo(DetailAST ast) {
         final FullIdent ident = FullIdent.createFullIdent(ast);
         final DetailAST firstClassNameNode = getFirstClassNameNode(ast);
         return new ExceptionInfo(firstClassNameNode,
                 new ClassInfo(new Token(ident)));
     }
 
     /**
      * Get node where class name of exception starts.
      *
      * @param ast DetailAST object where to find exceptions node;
      * @return exception node where class name starts
      */
     private static DetailAST getFirstClassNameNode(DetailAST ast) {
         DetailAST startNode = ast;
         while (startNode.getType() == TokenTypes.DOT) {
             startNode = startNode.getFirstChild();
         }
         return startNode;
     }
 
     /**
      * Checks if a 'throw' usage is contained within a block that should be ignored.
      * Such blocks consist of try (with catch) blocks, local classes, anonymous classes,
      * and lambda expressions. Note that a try block without catch is not considered.
      *
      * @param methodBodyAst DetailAST node representing the method body
      * @param throwAst DetailAST node representing the 'throw' literal
      * @return true if throwAst is inside a block that should be ignored
      */
     private static boolean isInIgnoreBlock(DetailAST methodBodyAst, DetailAST throwAst) {
         DetailAST ancestor = throwAst;
         while (ancestor != methodBodyAst) {
             if (ancestor.getType() == TokenTypes.LAMBDA
                     || ancestor.getType() == TokenTypes.OBJBLOCK
                     || ancestor.findFirstToken(TokenTypes.LITERAL_CATCH) != null) {
                 // throw is inside a lambda expression/anonymous class/local class,
                 // or throw is inside a try block, and there is a catch block
                 break;
             }
             if (ancestor.getType() == TokenTypes.LITERAL_CATCH
                     || ancestor.getType() == TokenTypes.LITERAL_FINALLY) {
                 // if the throw is inside a catch or finally block,
                 // skip the immediate ancestor (try token)
                 ancestor = ancestor.getParent();
             }
             ancestor = ancestor.getParent();
         }
         return ancestor != methodBodyAst;
     }
 
     /**
      * Combine ExceptionInfo collections together by matching names.
      *
      * @param first the first collection of ExceptionInfo
      * @param second the second collection of ExceptionInfo
      * @return combined list of ExceptionInfo
      */
     private static List<ExceptionInfo> combineExceptionInfo(Collection<ExceptionInfo> first,
                                                             Iterable<ExceptionInfo> second) {
         final List<ExceptionInfo> result = new ArrayList<>(first);
         for (ExceptionInfo exceptionInfo : second) {
             if (result.stream().noneMatch(item -> isExceptionInfoSame(item, exceptionInfo))) {
                 result.add(exceptionInfo);
             }
         }
         return result;
     }
 
     /**
      * Finds node of specified type among root children, siblings, siblings children
      * on any deep level.
      *
      * @param root    DetailAST
      * @param astType value of TokenType
      * @return {@link List} of {@link DetailAST} nodes which matches the predicate.
      */
     public static List<DetailAST> findTokensInAstByType(DetailAST root, int astType) {
         final List<DetailAST> result = new ArrayList<>();
         // iterative preorder depth-first search
         DetailAST curNode = root;
         do {
             // process curNode
             if (curNode.getType() == astType) {
                 result.add(curNode);
             }
             // process children (if any)
             if (curNode.hasChildren()) {
                 curNode = curNode.getFirstChild();
                 continue;
             }
             // backtrack to parent if last child, stopping at root
             while (curNode.getNextSibling() == null) {
                 curNode = curNode.getParent();
             }
             // explore siblings if not root
             if (curNode != root) {
                 curNode = curNode.getNextSibling();
             }
         } while (curNode != root);
         return result;
     }
 
     /**
      * Checks if all record components in a compact constructor have
      * corresponding {@code @param} tags.
      * Reports missing or extra {@code @param} tags in the Javadoc.
      *
      * @param tags the list of Javadoc tags
      * @param compactDef the compact constructor AST node
      * @param reportExpectedTags whether to report missing {@code @param} tags
      */
     private void checkRecordParamTags(final List<JavadocTag> tags,
         final DetailAST compactDef, boolean reportExpectedTags) {
 
         final DetailAST parent = getRecordDef(compactDef);
         final List<DetailAST> params = getRecordComponents(parent);
 
         for (JavadocTag tag : tags) {
             if (!tag.isParamTag()) {
                 continue;
             }
 
             if (isDuplicateParamTag(tags, tag)) {
                 log(tag.getLineNo(), tag.getColumnNo(), MSG_DUPLICATE_TAG,
                         JavadocTagInfo.PARAM.getText());
             }
             else {
                 final String arg1 = tag.getFirstArg();
                 final boolean found = removeMatchingParam(params, arg1);
 
                 if (!found) {
                     log(tag.getLineNo(), tag.getColumnNo(), MSG_UNUSED_TAG,
                             JavadocTagInfo.PARAM.getText(), arg1);
                 }
             }
         }
         tags.removeIf(JavadocTag::isParamTag);
 
         if (!allowMissingParamTags && reportExpectedTags) {
             for (DetailAST param : params) {
                 log(compactDef, MSG_EXPECTED_TAG,
                     JavadocTagInfo.PARAM.getText(), param.getText());
             }
         }
     }
 
     /**
      * Checks a set of tags for matching parameters.
      *
      * @param tags the tags to check
      * @param parent the node which takes the parameters
      * @param reportExpectedTags whether we should report if do not find
      *            expected tag
      */
     private void checkParamTags(final List<JavadocTag> tags,
             final DetailAST parent, boolean reportExpectedTags) {
         final List<DetailAST> params = getParameters(parent);
         final List<DetailAST> typeParams = CheckUtil
                 .getTypeParameters(parent);
 
         // Loop over the tags, checking to see they exist in the params.
         for (JavadocTag tag : tags) {
             if (!tag.isParamTag()) {
                 continue;
             }
 
             if (isDuplicateParamTag(tags, tag)) {
                 log(tag.getLineNo(), tag.getColumnNo(), MSG_DUPLICATE_TAG,
                         JavadocTagInfo.PARAM.getText());
             }
             else {
                 final String arg1 = tag.getFirstArg();
                 boolean found = removeMatchingParam(params, arg1);
 
                 if (arg1.endsWith(ELEMENT_END)) {
                     found = searchMatchingTypeParameter(typeParams,
                             arg1.substring(1, arg1.length() - 1));
                 }
 
                 // Handle extra JavadocTag
                 if (!found) {
                     log(tag.getLineNo(), tag.getColumnNo(), MSG_UNUSED_TAG,
                             JavadocTagInfo.PARAM.getText(), arg1);
                 }
             }
         }
         tags.removeIf(JavadocTag::isParamTag);
 
         // Now dump out all type parameters/parameters without tags :- unless
         // the user has chosen to suppress these problems
         if (!allowMissingParamTags && reportExpectedTags) {
             for (DetailAST param : params) {
                 log(param, MSG_EXPECTED_TAG,
                     JavadocTagInfo.PARAM.getText(), param.getText());
             }
 
             for (DetailAST typeParam : typeParams) {
                 log(typeParam, MSG_EXPECTED_TAG,
                     JavadocTagInfo.PARAM.getText(),
                     ELEMENT_START + typeParam.findFirstToken(TokenTypes.IDENT).getText()
                     + ELEMENT_END);
             }
         }
     }
 
     /**
      * Checks if the {@code @param} tag duplicates an earlier {@code @param} tag.
      *
      * @param tags all tags to check
      * @param tag the tag to check
      * @return true if there is an earlier {@code @param} tag with the same argument
      */
     private static boolean isDuplicateParamTag(List<JavadocTag> tags, JavadocTag tag) {
         final int tagIndex = tags.indexOf(tag);
         boolean result = false;
         for (int tagPosition = 0; tagPosition < tagIndex; tagPosition++) {
             final JavadocTag currentTag = tags.get(tagPosition);
             if (currentTag.isParamTag()
                     && currentTag.getFirstArg().equals(tag.getFirstArg())) {
                 result = true;
             }
         }
         return result;
     }
 
     /**
      * Returns true if required type found in type parameters.
      *
      * @param typeParams
      *            collection of type parameters
      * @param requiredTypeName
      *            name of required type
      * @return true if required type found in type parameters.
      */
     private static boolean searchMatchingTypeParameter(Iterable<DetailAST> typeParams,
             String requiredTypeName) {
         // Loop looking for matching type param
         final Iterator<DetailAST> typeParamsIt = typeParams.iterator();
         boolean found = false;
         while (typeParamsIt.hasNext()) {
             final DetailAST typeParam = typeParamsIt.next();
             if (typeParam.findFirstToken(TokenTypes.IDENT).getText()
                     .equals(requiredTypeName)) {
                 found = true;
                 typeParamsIt.remove();
                 break;
             }
         }
         return found;
     }
 
     /**
      * Remove parameter from params collection by name.
      *
      * @param params collection of DetailAST parameters
      * @param paramName name of parameter
      * @return true if parameter found and removed
      */
     private static boolean removeMatchingParam(Iterable<DetailAST> params, String paramName) {
         boolean found = false;
         final Iterator<DetailAST> paramIt = params.iterator();
         while (paramIt.hasNext()) {
             final DetailAST param = paramIt.next();
             if (param.getText().equals(paramName)) {
                 found = true;
                 paramIt.remove();
                 break;
             }
         }
         return found;
     }
 
     /**
      * Checks for only one return tag. All return tags will be removed from the
      * supplied list.
      *
      * @param tags the tags to check
      * @param lineNo the line number of the expected tag
      * @param reportExpectedTags whether we should report if do not find
      *            expected tag
      */
     private void checkReturnTag(List<JavadocTag> tags, int lineNo,
         boolean reportExpectedTags) {
         // Loop over tags finding return tags. After the first one, report a violation
         boolean found = false;
         final ListIterator<JavadocTag> it = tags.listIterator();
         while (it.hasNext()) {
             final JavadocTag javadocTag = it.next();
             if (javadocTag.isReturnTag()) {
                 if (found) {
                     log(javadocTag.getLineNo(), javadocTag.getColumnNo(),
                             MSG_DUPLICATE_TAG,
                             JavadocTagInfo.RETURN.getText());
                 }
                 found = true;
                 it.remove();
             }
         }
 
         // Handle there being no @return tags :- unless
         // the user has chosen to suppress these problems
         if (!found && !allowMissingReturnTag && reportExpectedTags) {
             log(lineNo, MSG_RETURN_EXPECTED);
         }
     }
 
     /**
      * Checks a set of tags for matching throws.
      *
      * @param tags the tags to check
      * @param throwsList the throws to check
      * @param reportExpectedTags whether we should report if do not find
      *            expected tag
      */
     private void checkThrowsTags(List<JavadocTag> tags,
             List<ExceptionInfo> throwsList, boolean reportExpectedTags) {
         // Loop over the tags, checking to see they exist in the throws.
         final ListIterator<JavadocTag> tagIt = tags.listIterator();
         while (tagIt.hasNext()) {
             final JavadocTag tag = tagIt.next();
 
             if (!tag.isThrowsTag()) {
                 continue;
             }
             tagIt.remove();
 
             // Loop looking for matching throw
             processThrows(throwsList, tag.getFirstArg());
         }
         // Now dump out all throws without tags :- unless
         // the user has chosen to suppress these problems
         if (validateThrows && reportExpectedTags) {
             throwsList.stream().filter(exceptionInfo -> !exceptionInfo.isFound())
                 .forEach(exceptionInfo -> {
                     final Token token = exceptionInfo.getName();
                     log(exceptionInfo.getAst(),
                         MSG_EXPECTED_TAG,
                         JavadocTagInfo.THROWS.getText(), token.text());
                 });
         }
     }
 
     /**
      * Verifies that documented exception is in throws.
      *
      * @param throwsIterable collection of throws
      * @param documentedClassName documented exception class name
      */
     private static void processThrows(Iterable<ExceptionInfo> throwsIterable,
                                       String documentedClassName) {
         for (ExceptionInfo exceptionInfo : throwsIterable) {
             if (isClassNamesSame(exceptionInfo.getName().text(),
                     documentedClassName)) {
                 exceptionInfo.setFound();
                 break;
             }
         }
     }
 
     /**
      * Check that ExceptionInfo objects are same by name.
      *
      * @param info1 ExceptionInfo object
      * @param info2 ExceptionInfo object
      * @return true is ExceptionInfo object have the same name
      */
     private static boolean isExceptionInfoSame(ExceptionInfo info1, ExceptionInfo info2) {
         return isClassNamesSame(info1.getName().text(),
                                     info2.getName().text());
     }
 
     /**
      * Check that class names are same by short name of class. If some class name is fully
      * qualified it is cut to short name.
      *
      * @param class1 class name
      * @param class2 class name
      * @return true is ExceptionInfo object have the same name
      */
     private static boolean isClassNamesSame(String class1, String class2) {
         final String class1ShortName = class1
                 .substring(class1.lastIndexOf('.') + 1);
         final String class2ShortName = class2
                 .substring(class2.lastIndexOf('.') + 1);
         return class1ShortName.equals(class2ShortName);
     }
 
     /**
      * Contains class's {@code Token}.
      *
      * @param name {@code FullIdent} associated with this class.
      */
     private record ClassInfo(Token name) {
     }
 
     /**
      * Represents text element with location in the text.
      *
      * @param text Token's text.
      */
     private record Token(String text) {
 
         /**
          * Converts FullIdent to Token.
          *
          * @param fullIdent full ident to convert.
          */
         private Token(FullIdent fullIdent) {
             this(fullIdent.getText());
         }
     }
 
     /** Stores useful information about declared exception. */
     private static final class ExceptionInfo {
 
         /** AST node representing this exception. */
         private final DetailAST ast;
 
         /** Class information associated with this exception. */
         private final ClassInfo classInfo;
         /** Does the exception have throws tag associated with. */
         private boolean found;
 
         /**
          * Creates new instance for {@code FullIdent}.
          *
          * @param ast AST node representing this exception
          * @param classInfo class info
          */
         private ExceptionInfo(DetailAST ast, ClassInfo classInfo) {
             this.ast = ast;
             this.classInfo = classInfo;
         }
 
         /**
          * Gets the AST node representing this exception.
          *
          * @return the AST node representing this exception
          */
         private DetailAST getAst() {
             return ast;
         }
 
         /** Mark that the exception has associated throws tag. */
         private void setFound() {
             found = true;
         }
 
         /**
          * Checks that the exception has throws tag associated with it.
          *
          * @return whether the exception has throws tag associated with
          */
         private boolean isFound() {
             return found;
         }
 
         /**
          * Gets exception name.
          *
          * @return exception's name
          */
         private Token getName() {
             return classInfo.name();
         }
 
     }
 
 }