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Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard
<?xml version="1.0"?> <!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN" "http://www.puppycrawl.com/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.sf.net (or in your downloaded distribution). To completely disable a check, just comment it out or delete it from the file. Authors: Max Vetrenko, Ruslan Diachenko, Roman Ivanov. --> <module name = "Checker"> <property name="charset" value="UTF-8"/> <property name="severity" value="warning"/> <property name="fileExtensions" value="java, properties, xml"/> <!-- Checks for whitespace --> <!-- See http://checkstyle.sf.net/config_whitespace.html --> <module name="FileTabCharacter"> <property name="eachLine" value="true"/> </module> <module name="TreeWalker"> <module name="OuterTypeFilename"/> <module name="IllegalTokenText"> <property name="tokens" value="STRING_LITERAL, CHAR_LITERAL"/> <property name="format" value="\\u00(08|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="Avoid using corresponding octal or Unicode escape."/> </module> <module name="AvoidEscapedUnicodeCharacters"> <property name="allowEscapesForControlCharacters" value="true"/> <property name="allowByTailComment" value="true"/> <property name="allowNonPrintableEscapes" value="true"/> </module> <module name="LineLength"> <property name="max" value="100"/> <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/> </module> <module name="AvoidStarImport"/> <module name="OneTopLevelClass"/> <module name="NoLineWrap"/> <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"/> <module name="LeftCurly"> <property name="maxLineLength" value="100"/> </module> <module name="RightCurly"/> <module name="RightCurly"> <property name="option" value="alone"/> <property name="tokens" value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, LITERAL_DO, STATIC_INIT, INSTANCE_INIT"/> </module> <module name="WhitespaceAround"> <property name="allowEmptyConstructors" value="true"/> <property name="allowEmptyMethods" value="true"/> <property name="allowEmptyTypes" value="true"/> <property name="allowEmptyLoops" value="true"/> <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="allowNoEmptyLineBetweenFields" value="true"/> </module> <module name="SeparatorWrap"> <property name="tokens" value="DOT"/> <property name="option" value="nl"/> </module> <module name="SeparatorWrap"> <property name="tokens" value="COMMA"/> <property name="option" value="EOL"/> </module> <module name="PackageName"> <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/> <message key="name.invalidPattern" value="Package name ''{0}'' must match pattern ''{1}''."/> </module> <module name="TypeName"> <message key="name.invalidPattern" value="Type name ''{0}'' must match pattern ''{1}''."/> </module> <module name="MemberName"> <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/> <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]*$"/> <message key="name.invalidPattern" value="Parameter name ''{0}'' must match pattern ''{1}''."/> </module> <module name="CatchParameterName"> <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/> <message key="name.invalidPattern" value="Catch parameter name ''{0}'' must match pattern ''{1}''."/> </module> <module name="LocalVariableName"> <property name="tokens" value="VARIABLE_DEF"/> <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/> <property name="allowOneCharVarInForLoop" value="true"/> <message key="name.invalidPattern" value="Local variable name ''{0}'' must match pattern ''{1}''."/> </module> <module name="ClassTypeParameterName"> <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/> <message key="name.invalidPattern" value="Class type name ''{0}'' must match pattern ''{1}''."/> </module> <module name="MethodTypeParameterName"> <property name="format" value="(^[A-Z][0-9]?)$|([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="2"/> <property name="braceAdjustment" value="0"/> <property name="caseIndent" value="2"/> <property name="throwsIndent" value="4"/> <property name="lineWrappingIndentation" value="4"/> <property name="arrayInitIndent" value="2"/> </module> <module name="AbbreviationAsWordInName"> <property name="ignoreFinal" value="false"/> <property name="allowedAbbreviationLength" value="1"/> </module> <module name="OverloadMethodsDeclarationOrder"/> <module name="VariableDeclarationUsageDistance"/> <module name="CustomImportOrder"> <property name="specialImportsRegExp" value="com.google"/> <property name="sortImportsInGroupAlphabetically" value="true"/> <property name="customImportOrderRules" value="STATIC###SPECIAL_IMPORTS###THIRD_PARTY_PACKAGE###STANDARD_JAVA_PACKAGE"/> </module> <module name="MethodParamPad"/> <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 "/> </module> <module name="AnnotationLocation"> <property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF"/> </module> <module name="AnnotationLocation"> <property name="tokens" value="VARIABLE_DEF"/> <property name="allowSamelineMultipleAnnotations" value="true"/> </module> <module name="NonEmptyAtclauseDescription"/> <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="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="scope" value="public"/> <property name="allowMissingParamTags" value="true"/> <property name="allowMissingThrowsTags" value="true"/> <property name="allowMissingReturnTag" value="true"/> <property name="minLineCount" value="2"/> <property name="allowedAnnotations" value="Override, Test"/> <property name="allowThrowsTagsForSubclasses" value="true"/> </module> <module name="MethodName"> <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/> <message key="name.invalidPattern" value="Method name ''{0}'' must match pattern ''{1}''."/> </module> <module name="SingleLineJavadoc"> <property name="ignoreInlineTags" value="false"/> </module> <module name="EmptyCatchBlock"> <property name="exceptionVariableName" value="expected"/> </module> <module name="CommentsIndentation"/> </module> </module>