Class OuterTypeNumberCheck

  • All Implemented Interfaces:
    Configurable, Contextualizable

    public class OuterTypeNumberCheck
    extends AbstractCheck

    Checks for the number of types declared at the outer (or root) level in a file.

    Rationale: It is considered good practice to only define one outer type per file.

    • Property max - Specify the maximum number of outer types allowed. Type is int. Default value is 1.

    To configure the check to accept 1 outer type per file:

     <module name="OuterTypeNumber"/>
     

    To configure the check to accept 2 outer types per file:

     <module name="OuterTypeNumber">
       <property name="max" value="2"/>
     </module>
     

    Parent is com.puppycrawl.tools.checkstyle.TreeWalker

    Violation Message Keys:

    • maxOuterTypes
    Since:
    5.0
    • Field Detail

      • max

        private int max
        Specify the maximum number of outer types allowed.
      • currentDepth

        private int currentDepth
        Tracks the current depth in types.
      • outerNum

        private int outerNum
        Tracks the number of outer types found.
    • Method Detail

      • 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:
        TokenTypes
      • beginTree

        public void beginTree​(DetailAST ast)
        Description copied from class: AbstractCheck
        Called before the starting to process a tree. Ideal place to initialize information that is to be collected whilst processing a tree.
        Overrides:
        beginTree in class AbstractCheck
        Parameters:
        ast - the root of the tree
      • finishTree

        public void finishTree​(DetailAST ast)
        Description copied from class: AbstractCheck
        Called after finished processing a tree. Ideal place to report on information collected whilst processing a tree.
        Overrides:
        finishTree in class AbstractCheck
        Parameters:
        ast - the root of the tree
      • setMax

        public void setMax​(int max)
        Setter to specify the maximum number of outer types allowed.
        Parameters:
        max - the new number.