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Rework checkstyle
* Update IntelliJ Checkstyle version * Move to non obstructing folder ``.config`` * Rework checkstyle file * Remove default values if possible * Remove outdated and non working checks * Remove exclusion for ``software.xdev`` which made this checkstyle useless * Create suppression file for individual projects xdev-software/github#18
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.config/checkstyle/checkstyle.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
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"http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
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<module name="Checker">
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<!-- Only check code -->
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<property name="fileExtensions" value="java"/>
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<property name="severity" value="error"/>
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<property name="tabWidth" value="4"/>
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<module name="SuppressionFilter">
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<property name="file" value=".config/checkstyle/suppressions.xml"/>
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</module>
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<module name="FileLength"/>
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<module name="LineLength">
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<property name="max" value="120"/>
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<property name="fileExtensions" value="java"/>
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<!-- Ignore default + links in comments -->
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<property name="ignorePattern" value="(^(package|import))|(^\s*(\/\/|\*) .*https?.*$)"/>
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</module>
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<module name="NewlineAtEndOfFile"/>
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<module name="RegexpSingleline">
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<!-- Ignore inside block comments (*) -->
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<property name="format" value="[^\s\*][\s]{1,}$"/>
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<property name="minimum" value="0"/>
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<property name="maximum" value="0"/>
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<property name="message" value="Line has trailing whitespaces"/>
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</module>
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<!-- Generated code -->
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<module name="SuppressionSingleFilter">
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<property name="checks" value="."/>
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<property name="files" value="[\\/](src)?gen[\\/].*\.java$"/>
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</module>
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<!-- Test code -->
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<module name="SuppressionSingleFilter">
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<property name="checks" value="MagicNumberCheck"/>
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<property name="files" value="[\\/]test[\\/].*\.java$"/>
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</module>
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<module name="SuppressWarningsFilter"/>
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<module name="TreeWalker">
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<!-- Checks - sorted alphabetically -->
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<module name="ArrayTypeStyle"/>
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<module name="AvoidStarImport"/>
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<module name="ConstantName"/>
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<module name="DefaultComesLast"/>
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<module name="EmptyBlock"/>
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<module name="EmptyCatchBlock"/>
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<module name="EmptyForInitializerPad"/>
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<module name="EmptyForIteratorPad"/>
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<module name="EmptyStatement"/>
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<module name="EqualsHashCode"/>
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<module name="ExplicitInitialization">
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<property name="severity" value="info"/>
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</module>
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<module name="FinalClass"/>
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<module name="FinalParameters"/>
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<module name="GenericWhitespace"/>
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<module name="HideUtilityClassConstructor"/>
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<module name="IllegalImport"/>
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<module name="InterfaceIsType"/>
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<module name="JavadocStyle">
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<property name="checkFirstSentence" value="false"/>
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</module>
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<module name="LeftCurly">
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<!-- Default minus Lambda -->
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<property name="tokens" value="ANNOTATION_DEF, CLASS_DEF, CTOR_DEF, ENUM_CONSTANT_DEF, ENUM_DEF, INTERFACE_DEF, 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"/>
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<property name="option" value="nl"/>
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</module>
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<module name="LocalFinalVariableName"/>
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<module name="LocalVariableName"/>
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<module name="MagicNumber">
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<property name="ignoreAnnotation" value="true"/>
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<property name="ignoreFieldDeclaration" value="true"/>
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<property name="ignoreHashCodeMethod" value="true"/>
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<!-- Defaults + other common constant values (e.g. time) -->
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<property name="ignoreNumbers" value="-1, 0, 1, 2, 3, 4, 5, 10, 12, 24, 31, 60, 100, 1000"/>
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</module>
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<module name="MemberName"/>
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<module name="MethodLength"/>
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<module name="MethodName"/>
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<module name="MethodParamPad"/>
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<module name="MissingDeprecated"/>
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<module name="MissingOverride"/>
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<module name="MissingSwitchDefault"/>
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<module name="ModifierOrder"/>
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<module name="NeedBraces"/>
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<module name="NoClone"/>
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<module name="NoFinalizer"/>
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<module name="NonEmptyAtclauseDescription"/>
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<module name="NoWhitespaceAfter"/>
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<module name="NoWhitespaceBefore"/>
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<module name="OneStatementPerLine"/>
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<module name="OneTopLevelClass"/>
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<module name="OperatorWrap"/>
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<module name="OuterTypeNumber"/>
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<module name="PackageName"/>
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<module name="ParameterName"/>
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<module name="ParenPad"/>
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<module name="RedundantImport"/>
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<module name="RequireThis"/>
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<module name="RightCurly">
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<property name="option" value="alone"/>
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</module>
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<module name="SimplifyBooleanExpression"/>
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<module name="StaticVariableName"/>
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<module name="StringLiteralEquality"/>
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<module name="SuppressWarningsHolder"/>
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<module name="TodoComment">
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<property name="severity" value="info"/>
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</module>
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<module name="TypecastParenPad"/>
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<module name="TypeName"/>
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<module name="UnusedImports"/>
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<module name="UpperEll"/>
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<module name="VisibilityModifier">
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<property name="packageAllowed" value="true"/>
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<property name="protectedAllowed" value="true"/>
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</module>
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<module name="WhitespaceAfter">
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<property name="tokens" value="COMMA,SEMI"/>
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</module>
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<module name="WhitespaceAround">
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<property name="tokens"
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value="ASSIGN,BAND,BAND_ASSIGN,BOR,BOR_ASSIGN,BSR,BSR_ASSIGN,BXOR,BXOR_ASSIGN,COLON,DIV,DIV_ASSIGN,EQUAL,GE,GT,LAND,LCURLY,LE,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,TYPE_EXTENSION_AND"/>
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</module>
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<!-- Filter -->
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<module name="SuppressionCommentFilter">
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<property name="offCommentFormat" value="\s*CHECKSTYLE:OFF\s*[^\s]{1,}"/>
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<property name="onCommentFormat" value="\s*CHECKSTYLE:ON"/>
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</module>
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</module>
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</module>

.config/checkstyle/suppressions.xml

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<?xml version="1.0"?>
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<!DOCTYPE suppressions PUBLIC
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"-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
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"https://checkstyle.org/dtds/suppressions_1_2.dtd">
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<suppressions>
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</suppressions>

.idea/checkstyle-idea.xml

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