Package com.puppycrawl.tools.checkstyle.checks.javadoc

Class JavadocStyleCheck

java.lang.Object
com.puppycrawl.tools.checkstyle.AbstractAutomaticBean
com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter
com.puppycrawl.tools.checkstyle.api.AbstractCheck
com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocStyleCheck
All Implemented Interfaces:
Configurable, Contextualizable
public class JavadocStyleCheck extends AbstractCheck
Validates Javadoc comments to help ensure they are well formed.

The following checks are performed:

  • Ensures the first sentence ends with proper punctuation (That is a period, question mark, or exclamation mark, by default). Note that this check is not applied to inline @return tags, because the Javadoc tools automatically appends a period to the end of the tag content. Javadoc automatically places the first sentence in the method summary table and index. Without proper punctuation the Javadoc may be malformed. All items eligible for the {@inheritDoc} tag are exempt from this requirement.
  • Check text for Javadoc statements that do not have any description. This includes both completely empty Javadoc, and Javadoc with only tags such as @param and @return.
  • Check text for incomplete HTML tags. Verifies that HTML tags have corresponding end tags and issues an "Unclosed HTML tag found:" error if not. An "Extra HTML tag found:" error is issued if an end tag is found without a previous open tag.
  • Check that a package Javadoc comment is well-formed (as described above).
  • Check for allowed HTML tags. The list of allowed HTML tags is "a", "abbr", "acronym", "address", "area", "b", "bdo", "big", "blockquote", "br", "caption", "cite", "code", "colgroup", "dd", "del", "dfn", "div", "dl", "dt", "em", "fieldset", "font", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "i", "img", "ins", "kbd", "li", "ol", "p", "pre", "q", "samp", "small", "span", "strong", "sub", "sup", "table", "tbody", "td", "tfoot", "th", "thead", "tr", "tt", "u", "ul", "var".

These checks were patterned after the checks made by the DocCheck doclet available from Sun. Note: Original Sun's DocCheck tool does not exist anymore.

Since:
3.2

  • Field Details

  • Constructor Details

  • Method Details

    • getDefaultTokens

      public int[] getDefaultTokens()
      Description copied from class: AbstractCheck
      Returns the default token a check is interested in. Only used if the configuration for a check does not define the tokens.
      Specified by:
      getDefaultTokens in class AbstractCheck
      Returns:
      the default tokens
      See Also:

    • getAcceptableTokens

      public int[] getAcceptableTokens()
      Description copied from class: AbstractCheck
      The configurable token set. Used to protect Checks against malicious users who specify an unacceptable token set in the configuration file. The default implementation returns the check's default tokens.
      Specified by:
      getAcceptableTokens in class AbstractCheck
      Returns:
      the token set this check is designed for.
      See Also:

    • getRequiredTokens

      public int[] getRequiredTokens()
      Description copied from class: AbstractCheck
      The tokens that this check must be registered for.
      Specified by:
      getRequiredTokens in class AbstractCheck
      Returns:
      the token set this must be registered for.
      See Also:

    • visitToken

      public void visitToken(DetailAST ast)
      Description copied from class: AbstractCheck
      Called to process a token.
      Overrides:
      visitToken in class AbstractCheck
      Parameters:
      ast - the token to process

    • shouldCheck

      private boolean shouldCheck(DetailAST ast)
      Whether we should check this node.
      Parameters:
      ast - a given node.
      Returns:
      whether we should check a given node.

    • checkComment

      private void checkComment(DetailAST ast, TextBlock comment)
      Performs the various checks against the Javadoc comment.
      Parameters:
      ast - the AST of the element being documented
      comment - the source lines that make up the Javadoc comment.
      See Also:

    • checkFirstSentenceEnding

      private void checkFirstSentenceEnding(DetailAST ast, TextBlock comment)
      Checks that the first sentence ends with proper punctuation. This method uses a regular expression that checks for the presence of a period, question mark, or exclamation mark followed either by whitespace, an HTML element, or the end of string. This method ignores {_AT_inheritDoc} comments for TokenTypes that are valid for {_AT_inheritDoc}.
      Parameters:
      ast - the current node
      comment - the source lines that make up the Javadoc comment.

    • checkJavadocIsNotEmpty

      private void checkJavadocIsNotEmpty(TextBlock comment)
      Checks that the Javadoc is not empty.
      Parameters:
      comment - the source lines that make up the Javadoc comment.

    • getCommentText

      private static String getCommentText(String... comments)
      Returns the comment text from the Javadoc.
      Parameters:
      comments - the lines of Javadoc.
      Returns:
      a comment text String.

    • findTextStart

      private static int findTextStart(String line)
      Finds the index of the first non-whitespace character ignoring the Javadoc comment start and end strings (/** and */) as well as any leading asterisk.
      Parameters:
      line - the Javadoc comment line of text to scan.
      Returns:
      the int index relative to 0 for the start of text or -1 if not found.

    • trimTail

      private static void trimTail(StringBuilder builder)
      Trims any trailing whitespace or the end of Javadoc comment string.
      Parameters:
      builder - the StringBuilder to trim.

    • checkHtmlTags

      private void checkHtmlTags(DetailAST ast, TextBlock comment)
      Checks the comment for HTML tags that do not have a corresponding close tag or a close tag that has no previous open tag. This code was primarily copied from the DocCheck checkHtml method.
      Parameters:
      ast - the node with the Javadoc
      comment - the TextBlock which represents the Javadoc comment.

    • checkUnclosedTags

      private void checkUnclosedTags(Deque<HtmlTag> htmlStack, String token)
      Checks to see if there are any unclosed tags on the stack. The token represents a html tag that has been closed and has a corresponding open tag on the stack. Any tags, except single tags, that were opened (pushed on the stack) after the token are missing a close.
      Parameters:
      htmlStack - the stack of opened HTML tags.
      token - the current HTML tag name that has been closed.

    • isSingleTag

      private static boolean isSingleTag(HtmlTag tag)
      Determines if the HtmlTag is one which does not require a close tag.
      Parameters:
      tag - the HtmlTag to check.
      Returns:
      true if the HtmlTag is a single tag.

    • isAllowedTag

      private static boolean isAllowedTag(HtmlTag tag)
      Determines if the HtmlTag is one which is allowed in a javadoc.
      Parameters:
      tag - the HtmlTag to check.
      Returns:
      true if the HtmlTag is an allowed html tag.

    • isExtraHtml

      private static boolean isExtraHtml(String token, Deque<HtmlTag> htmlStack)
      Determines if the given token is an extra HTML tag. This indicates that a close tag was found that does not have a corresponding open tag.
      Parameters:
      token - an HTML tag id for which a close was found.
      htmlStack - a Stack of previous open HTML tags.
      Returns:
      false if a previous open tag was found for the token.

    • setScope

      public void setScope(Scope scope)
      Setter to specify the visibility scope where Javadoc comments are checked.
      Parameters:
      scope - a scope.
      Since:
      3.2

    • setExcludeScope

      public void setExcludeScope(Scope excludeScope)
      Setter to specify the visibility scope where Javadoc comments are not checked.
      Parameters:
      excludeScope - a scope.
      Since:
      3.4

    • setEndOfSentenceFormat

      public void setEndOfSentenceFormat(Pattern pattern)
      Setter to specify the format for matching the end of a sentence.
      Parameters:
      pattern - a pattern.
      Since:
      5.0

    • setCheckFirstSentence

      public void setCheckFirstSentence(boolean flag)
      Setter to control whether to check the first sentence for proper end of sentence.
      Parameters:
      flag - true if the first sentence is to be checked
      Since:
      3.2

    • setCheckHtml

      public void setCheckHtml(boolean flag)
      Setter to control whether to check for incomplete HTML tags.
      Parameters:
      flag - true if HTML checking is to be performed.
      Since:
      3.2

    • setCheckEmptyJavadoc

      public void setCheckEmptyJavadoc(boolean flag)
      Setter to control whether to check if the Javadoc is missing a describing text.
      Parameters:
      flag - true if empty Javadoc checking should be done.
      Since:
      3.4