checkstyle.xml

<?xml version="1.0"?>
<!--
  ~ Copyright 2019-2023 CloudNetService team & contributors
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~     http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  -->

<!DOCTYPE module PUBLIC
  "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
  "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
  <module name="BeforeExecutionExclusionFileFilter">
    <property name="fileNamePattern" value="module\-info\.java$"/>
  </module>
  <module name="SuppressionFilter">
    <property default="checkstyle-suppressions.xml" name="file"
      value="${org.checkstyle.google.suppressionfilter.config}"/>
    <property name="optional" value="true"/>
  </module>
  <module name="FileTabCharacter">
    <property name="eachLine" value="true"/>
  </module>
  <module name="LineLength">
    <property name="fileExtensions" value="java"/>
    <property name="max" value="140"/>
    <property name="ignorePattern" value="^package.*|^import.*|a href|http://|https://|ftp://|//.*"/>
  </module>
  <module name="TreeWalker">
    <module name="SuppressionCommentFilter">
      <property name="offCommentFormat" value="CHECKSTYLE.OFF\: ([\w\|]+)"/>
      <property name="onCommentFormat" value="CHECKSTYLE.ON"/>
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="\.printStackTrace\(\)"/>
      <property name="ignoreComments" value="true"/>
      <property name="message"
        value="Using Throwable#printStackTrace() is forbidden. Rethrow, log or handle the exception."/>
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="^import [a-z.]*\.[A-Z]\w+(\.[A-Z]\w+)+;$"/>
      <property name="ignoreComments" value="true"/>
      <property name="message" value="Using inner class imports is forbidden."/>
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="^import (?!lombok).*(NotNull|NonNull|Nonnull);$"/>
      <property name="ignoreComments" value="true"/>
      <property name="message" value="Any @NonNull annnotation should be imported from lombok."/>
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="System\.(out|err)\..+;"/>
      <property name="ignoreComments" value="true"/>
      <property name="message"
        value="Using System.out or System.err is forbidden. Use a proper logger to log messages into the console."/>
    </module>
    <module name="RequireThis">
      <property name="validateOnlyOverlapping" value="false"/>
    </module>
    <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="CustomImportOrder">
      <property name="sortImportsInGroupAlphabetically" value="true"/>
      <property name="separateLineBetweenGroups" value="true"/>
      <property name="customImportOrderRules" value="STATIC###THIRD_PARTY_PACKAGE"/>
      <property name="tokens" value="IMPORT, STATIC_IMPORT, PACKAGE_DEF"/>
    </module>
    <module name="AvoidStarImport"/>
    <module name="RedundantImport"/>
    <module name="UnusedImports"/>
    <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"/>
      <property name="ignoreEnums" value="false"/>
    </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_WHILE, LITERAL_DO, LITERAL_FOR, DO_WHILE, LITERAL_CASE, LITERAL_YIELD"/>
    </module>
    <module name="WhitespaceAround">
      <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."/>
      <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"/>
      <property name="allowEmptyConstructors" value="true"/>
      <property name="allowEmptyLambdas" value="true"/>
    </module>
    <module name="NoWhitespaceBeforeCaseDefaultColon"/>
    <module name="OneStatementPerLine"/>
    <module name="MultipleVariableDeclarations"/>
    <module name="ArrayTypeStyle"/>
    <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">
      <message key="name.invalidPattern"
        value="Package name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[a-z_]+(\.[a-z_][a-z0-9]*)*$"/>
    </module>
    <module name="TypeName">
      <message key="name.invalidPattern"
        value="Type name ''{0}'' must match pattern ''{1}''."/>
      <property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
                    ANNOTATION_DEF, RECORD_DEF"/>
    </module>
    <module name="MemberName">
      <message key="name.invalidPattern"
        value="Member name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[a-z]([a-zA-Z0-9]*)*$"/>
    </module>
    <module name="ParameterName">
      <message key="name.invalidPattern"
        value="Parameter name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[$a-z]([a-zA-Z0-9_]*)*$"/>
    </module>
    <module name="LambdaParameterName">
      <message key="name.invalidPattern"
        value="Lambda parameter name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[$a-z_]([a-z0-9_][a-zA-Z0-9_]*)?$"/>
    </module>
    <module name="CatchParameterName">
      <message key="name.invalidPattern"
        value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
    </module>
    <module name="LocalVariableName">
      <message key="name.invalidPattern"
        value="Local variable name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
    </module>
    <module name="PatternVariableName">
      <message key="name.invalidPattern"
        value="Pattern variable name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
    </module>
    <module name="ClassTypeParameterName">
      <message key="name.invalidPattern"
        value="Class type name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
    </module>
    <module name="RecordComponentName">
      <message key="name.invalidPattern"
        value="Record component name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[a-z]([a-zA-Z0-9]*)*$"/>
    </module>
    <module name="RecordTypeParameterName">
      <message key="name.invalidPattern"
        value="Record type name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
    </module>
    <module name="MethodTypeParameterName">
      <message key="name.invalidPattern"
        value="Method type name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
    </module>
    <module name="InterfaceTypeParameterName">
      <message key="name.invalidPattern"
        value="Interface type name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
    </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="2"/>
      <property name="braceAdjustment" value="0"/>
      <property name="caseIndent" value="2"/>
      <property name="throwsIndent" value="2"/>
      <property name="lineWrappingIndentation" value="2"/>
      <property name="arrayInitIndent" value="2"/>
    </module>
    <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="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="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, RECORD_DEF, COMPACT_CTOR_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="MethodName">
      <message key="name.invalidPattern"
        value="Method name ''{0}'' must match pattern ''{1}''."/>
      <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
    </module>
    <module name="SingleLineJavadoc"/>
    <module name="EmptyCatchBlock">
      <property name="exceptionVariableName" value="ignored|expected"/>
    </module>
    <module name="CommentsIndentation">
      <property name="tokens" value="SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN"/>
    </module>
    <!-- https://checkstyle.org/config_filters.html#SuppressionXpathFilter -->
    <module name="SuppressionXpathFilter">
      <property default="checkstyle-xpath-suppressions.xml" name="file"
        value="${org.checkstyle.google.suppressionxpathfilter.config}"/>
      <property name="optional" value="true"/>
    </module>
    <module name="AvoidDoubleBraceInitialization"/>
    <module name="AvoidNoArgumentSuperConstructorCall"/>
    <module name="ConstantName"/>
    <module name="EmptyStatement"/>
    <module name="MissingOverride"/>
  </module>
  <property name="fileExtensions" value="java, properties, xml"/>
  <property name="charset" value="UTF-8"/>
  <property name="severity" value="warning"/>
</module>