checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">

<!--
    Checkstyle configuration that checks the Google coding conventions from Google Java Style
    that can be found at https://google.github.io/styleguide/javaguide.html

    Checkstyle is very configurable. Be sure to read the documentation at
    http://checkstyle.org (or in your downloaded distribution).

    To completely disable a check, just comment it out or delete it from the file.
    To suppress certain violations please review suppression filters.

    Authors: Max Vetrenko, Ruslan Diachenko, Roman Ivanov.
 -->

<module name="Checker">
    <module name="SuppressWarningsFilter" />

    <property name="charset" value="UTF-8" />

    <property name="severity" value="error" />

    <property name="fileExtensions" value="java, properties, xml" />
    <!-- Excludes all 'module-info.java' files              -->
    <!-- See https://checkstyle.org/config_filefilters.html -->
    <module name="BeforeExecutionExclusionFileFilter">
        <property name="fileNamePattern" value="module\-info\.java$" />
    </module>
    <!-- https://checkstyle.org/config_filters.html#SuppressionFilter -->

    <module name="SuppressionFilter">
        <property name="file" value="checkstyle-suppressions.xml" />
    </module>

    <!-- Checks for whitespace                               -->
    <!-- See http://checkstyle.org/config_whitespace.html -->
    <module name="FileTabCharacter">
        <property name="eachLine" value="true" />
    </module>

    <module name="LineLength">
        <property name="fileExtensions" value="java" />
        <property name="max" value="120"/>
        <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://" />
    </module>

    <module name="TreeWalker">
        <module name="OuterTypeFilename" />
        <module name="IllegalTokenText">
            <property name="tokens" value="STRING_LITERAL, CHAR_LITERAL" />
            <property name="format" value="\\u00(09|0(a|A)|0(c|C)|0(d|D)|22|27|5(C|c))|\\(0(10|11|12|14|15|42|47)|134)" />
            <property name="message" value="Consider using special escape sequence instead of octal value or Unicode escaped value." />
        </module>
        <module name="AvoidEscapedUnicodeCharacters">
            <property name="allowEscapesForControlCharacters" value="true" />
            <property name="allowByTailComment" value="true" />
            <property name="allowNonPrintableEscapes" value="true" />
        </module>
        <module name="AvoidStarImport" />
        <module name="OneTopLevelClass" />
        <module name="NoLineWrap">
            <property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT" />
        </module>
        <module name="EmptyBlock">
            <property name="option" value="TEXT" />
            <property name="tokens" value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH" />
        </module>
        <module name="NeedBraces">
            <property name="tokens" value="LITERAL_DO, LITERAL_ELSE, LITERAL_FOR, LITERAL_IF, LITERAL_WHILE" />
        </module>
        <module name="LeftCurly">
            <property name="tokens" value="ANNOTATION_DEF, CLASS_DEF, CTOR_DEF, ENUM_CONSTANT_DEF, ENUM_DEF,
                    INTERFACE_DEF, LAMBDA, LITERAL_CASE, LITERAL_CATCH, LITERAL_DEFAULT,
                    LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF,
                    LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, METHOD_DEF,
                    OBJBLOCK, STATIC_INIT, RECORD_DEF, COMPACT_CTOR_DEF" />
        </module>
        <module name="RightCurly">
            <property name="id" value="RightCurlySame" />
            <property name="tokens" value="LITERAL_TRY, LITERAL_CATCH, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE,
                    LITERAL_DO" />
        </module>
        <module name="RightCurly">
            <property name="id" value="RightCurlyAlone" />
            <property name="option" value="alone" />
            <property name="tokens" value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, STATIC_INIT,
                    INSTANCE_INIT, ANNOTATION_DEF, ENUM_DEF, INTERFACE_DEF, RECORD_DEF,
                    COMPACT_CTOR_DEF" />
        </module>
        <module name="SuppressionXpathSingleFilter">
            <!-- suppresion is required till https://github.com/checkstyle/checkstyle/issues/7541 -->
            <property name="id" value="RightCurlyAlone" />
            <property name="query" value="//RCURLY[parent::SLIST[count(./*)=1]
                                     or preceding-sibling::*[last()][self::LCURLY]]" />
        </module>
        <module name="WhitespaceAfter">
            <property name="tokens" value="COMMA, SEMI, TYPECAST, LITERAL_IF, LITERAL_ELSE, LITERAL_RETURN,
                    LITERAL_WHILE, LITERAL_DO, LITERAL_FOR, LITERAL_FINALLY, DO_WHILE, ELLIPSIS,
                    LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_CATCH, LAMBDA,
                    LITERAL_YIELD, LITERAL_CASE" />
        </module>
        <module name="WhitespaceAround">
            <property name="allowEmptyConstructors" value="true" />
            <property name="allowEmptyLambdas" value="true" />
            <property name="allowEmptyMethods" value="true" />
            <property name="allowEmptyTypes" value="true" />
            <property name="allowEmptyLoops" value="true" />
            <property name="ignoreEnhancedForColon" value="false" />
            <property name="tokens" value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR,
                    BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN, DO_WHILE, EQUAL, GE, GT, LAMBDA, LAND,
                    LCURLY, LE, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY,
                    LITERAL_FOR, LITERAL_IF, LITERAL_RETURN, LITERAL_SWITCH, LITERAL_SYNCHRONIZED,
                    LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN,
                    NOT_EQUAL, PLUS, PLUS_ASSIGN, QUESTION, RCURLY, SL, SLIST, SL_ASSIGN, SR,
                    SR_ASSIGN, STAR, STAR_ASSIGN, LITERAL_ASSERT, TYPE_EXTENSION_AND" />
            <message key="ws.notFollowed" value="WhitespaceAround: ''{0}'' is not followed by whitespace. Empty blocks
               may only be represented as '{}' when not part of a multi-block statement (4.1.3)" />
            <message key="ws.notPreceded" value="WhitespaceAround: ''{0}'' is not preceded with whitespace." />
        </module>
        <module name="OneStatementPerLine" />
        <module name="MultipleVariableDeclarations" />
        <module name="ArrayTypeStyle" />
        <module name="MissingSwitchDefault" />
        <module name="FallThrough" />
        <module name="UpperEll" />
        <module name="ModifierOrder" />
        <module name="EmptyLineSeparator">
            <property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT, CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
                    STATIC_INIT, INSTANCE_INIT, METHOD_DEF, CTOR_DEF, VARIABLE_DEF, RECORD_DEF,
                    COMPACT_CTOR_DEF" />
            <property name="allowNoEmptyLineBetweenFields" value="true" />
        </module>
        <module name="SeparatorWrap">
            <property name="id" value="SeparatorWrapDot" />
            <property name="tokens" value="DOT" />
            <property name="option" value="nl" />
        </module>
        <module name="SeparatorWrap">
            <property name="id" value="SeparatorWrapComma" />
            <property name="tokens" value="COMMA" />
            <property name="option" value="EOL" />
        </module>
        <module name="SeparatorWrap">
            <!-- ELLIPSIS is EOL until https://github.com/google/styleguide/issues/259 -->
            <property name="id" value="SeparatorWrapEllipsis" />
            <property name="tokens" value="ELLIPSIS" />
            <property name="option" value="EOL" />
        </module>
        <module name="SeparatorWrap">
            <!-- ARRAY_DECLARATOR is EOL until https://github.com/google/styleguide/issues/258 -->
            <property name="id" value="SeparatorWrapArrayDeclarator" />
            <property name="tokens" value="ARRAY_DECLARATOR" />
            <property name="option" value="EOL" />
        </module>
        <module name="SeparatorWrap">
            <property name="id" value="SeparatorWrapMethodRef" />
            <property name="tokens" value="METHOD_REF" />
            <property name="option" value="nl" />
        </module>
        <module name="PackageName">
            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$" />
            <message key="name.invalidPattern" value="Package name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="TypeName">
            <property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
                    ANNOTATION_DEF, RECORD_DEF" />
            <message key="name.invalidPattern" value="Type name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="MemberName">
            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$" />
            <message key="name.invalidPattern" value="Member name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="ParameterName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$" />
            <message key="name.invalidPattern" value="Parameter name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="LambdaParameterName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$" />
            <message key="name.invalidPattern" value="Lambda parameter name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="CatchParameterName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$" />
            <message key="name.invalidPattern" value="Catch parameter name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="LocalVariableName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$" />
            <message key="name.invalidPattern" value="Local variable name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="PatternVariableName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$" />
            <message key="name.invalidPattern" value="Pattern variable name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="ClassTypeParameterName">
            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)" />
            <message key="name.invalidPattern" value="Class type name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="RecordComponentName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$" />
            <message key="name.invalidPattern" value="Record component name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="RecordTypeParameterName">
            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)" />
            <message key="name.invalidPattern" value="Record type name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="MethodTypeParameterName">
            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)" />
            <message key="name.invalidPattern" value="Method type name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="InterfaceTypeParameterName">
            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)" />
            <message key="name.invalidPattern" value="Interface type name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="NoFinalizer" />
        <module name="GenericWhitespace">
            <message key="ws.followed" value="GenericWhitespace ''{0}'' is followed by whitespace." />
            <message key="ws.preceded" value="GenericWhitespace ''{0}'' is preceded with whitespace." />
            <message key="ws.illegalFollow" value="GenericWhitespace ''{0}'' should followed by whitespace." />
            <message key="ws.notPreceded" value="GenericWhitespace ''{0}'' is not preceded with whitespace." />
        </module>
        <module name="Indentation">
            <property name="basicOffset" value="4" />
            <property name="braceAdjustment" value="0" />
            <property name="caseIndent" value="4" />
            <property name="throwsIndent" value="4" />
            <property name="lineWrappingIndentation" value="4" />
            <property name="arrayInitIndent" value="4" />
        </module>
        <module name="AbbreviationAsWordInName">
            <property name="ignoreFinal" value="true" />
            <property name="allowedAbbreviationLength" value="0" />
            <property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, ANNOTATION_DEF, ANNOTATION_FIELD_DEF,
                    PARAMETER_DEF, VARIABLE_DEF, METHOD_DEF, PATTERN_VARIABLE_DEF, RECORD_DEF,
                    RECORD_COMPONENT_DEF" />
        </module>
        <module name="NoWhitespaceBeforeCaseDefaultColon" />
        <module name="OverloadMethodsDeclarationOrder" />
        <module name="VariableDeclarationUsageDistance" />

        <module name="MethodParamPad">
            <property name="tokens" value="CTOR_DEF, LITERAL_NEW, METHOD_CALL, METHOD_DEF,
                    SUPER_CTOR_CALL, ENUM_CONSTANT_DEF, RECORD_DEF" />
        </module>
        <module name="NoWhitespaceBefore">
            <property name="tokens" value="COMMA, SEMI, POST_INC, POST_DEC, DOT,
                    LABELED_STAT, METHOD_REF" />
            <property name="allowLineBreaks" value="true" />
        </module>
        <module name="ParenPad">
            <property name="tokens" value="ANNOTATION, ANNOTATION_FIELD_DEF, CTOR_CALL, CTOR_DEF, DOT, ENUM_CONSTANT_DEF,
                    EXPR, LITERAL_CATCH, LITERAL_DO, LITERAL_FOR, LITERAL_IF, LITERAL_NEW,
                    LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_WHILE, METHOD_CALL,
                    METHOD_DEF, QUESTION, RESOURCE_SPECIFICATION, SUPER_CTOR_CALL, LAMBDA,
                    RECORD_DEF" />
        </module>
        <module name="OperatorWrap">
            <property name="option" value="NL" />
            <property name="tokens" value="BAND, BOR, BSR, BXOR, DIV, EQUAL, GE, GT, LAND, LE, LITERAL_INSTANCEOF, LOR,
                    LT, MINUS, MOD, NOT_EQUAL, PLUS, QUESTION, SL, SR, STAR, METHOD_REF,
                    TYPE_EXTENSION_AND " />
        </module>
        <module name="AnnotationLocation">
            <property name="id" value="AnnotationLocationMostCases" />
            <property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF,
                      RECORD_DEF, COMPACT_CTOR_DEF" />
        </module>
        <module name="AnnotationLocation">
            <property name="id" value="AnnotationLocationVariables" />
            <property name="tokens" value="VARIABLE_DEF" />
            <property name="allowSamelineMultipleAnnotations" value="true" />
        </module>
        <module name="NonEmptyAtclauseDescription" />
        <module name="InvalidJavadocPosition" />
        <module name="JavadocTagContinuationIndentation" />
        <module name="SummaryJavadoc">
            <property name="forbiddenSummaryFragments" value="^@return the *|^This method returns |^A [{]@code [a-zA-Z0-9]+[}]( is a )" />
        </module>
        <module name="JavadocParagraph" />
        <module name="RequireEmptyLineBeforeBlockTagGroup" />
        <module name="AtclauseOrder">
            <property name="tagOrder" value="@param, @return, @throws, @deprecated" />
            <property name="target" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF, VARIABLE_DEF" />
        </module>
        <module name="JavadocMethod">
            <property name="accessModifiers" value="public" />
            <property name="allowMissingParamTags" value="true" />
            <property name="allowMissingReturnTag" value="true" />
            <property name="allowedAnnotations" value="Override, Test" />
            <property name="tokens" value="METHOD_DEF, CTOR_DEF, ANNOTATION_FIELD_DEF, COMPACT_CTOR_DEF" />
        </module>
        <module name="MissingJavadocMethod">
            <property name="scope" value="public" />
            <property name="minLineCount" value="2" />
            <property name="allowedAnnotations" value="Override, Test" />
            <property name="tokens" value="METHOD_DEF, CTOR_DEF, ANNOTATION_FIELD_DEF,
                                   COMPACT_CTOR_DEF" />
        </module>
        <module name="MissingJavadocType">
            <property name="scope" value="protected" />
            <property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
                      RECORD_DEF, ANNOTATION_DEF" />
            <property name="excludeScope" value="nothing" />
        </module>
        <module name="MethodName">
            <property name="format" value="^[a-z][a-z0-9]\w*$" />
            <message key="name.invalidPattern" value="Method name ''{0}'' must match pattern ''{1}''." />
        </module>
        <module name="SingleLineJavadoc" />
        <module name="EmptyCatchBlock">
            <property name="exceptionVariableName" value="expected" />
        </module>
        <module name="CommentsIndentation">
            <property name="tokens" value="SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN" />
        </module>
        <!-- https://checkstyle.org/config_filters.html#SuppressionXpathFilter -->
        <module name="SuppressionXpathFilter">
            <property name="file" value="${org.checkstyle.google.suppressionxpathfilter.config}" default="checkstyle-xpath-suppressions.xml" />
            <property name="optional" value="true" />
        </module>
        <module name="SuppressWarningsHolder" />
        <module name="SuppressionCommentFilter">
            <property name="offCommentFormat" value="CHECKSTYLE.OFF\: ([\w\|]+)" />
            <property name="onCommentFormat" value="CHECKSTYLE.ON\: ([\w\|]+)" />
            <property name="checkFormat" value="$1" />
        </module>
        <module name="SuppressWithNearbyCommentFilter">
            <property name="commentFormat" value="CHECKSTYLE.SUPPRESS\: ([\w\|]+)" />
            <!-- $1 refers to the first match group in the regex defined in commentFormat -->
            <property name="checkFormat" value="$1" />
            <!-- The check is suppressed in the next line of code after the comment -->
            <property name="influenceFormat" value="1" />
        </module>
    </module>
</module>