diff --git a/config/checkstyle/checkstyle.xml b/config/checkstyle/checkstyle.xml
new file mode 100644
index 0000000000000000000000000000000000000000..8f9a767c4e9fd3f913ade31dc2f09d9969e7f223
--- /dev/null
+++ b/config/checkstyle/checkstyle.xml
@@ -0,0 +1,372 @@
+<?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="warning"/>
+
+ <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$"/>
+ </module>
+ <!-- https://checkstyle.org/config_filters.html#SuppressionFilter -->
+ <module name="SuppressionFilter">
+ <property name="file" value="${org.checkstyle.google.suppressionfilter.config}"
+ default="checkstyle-suppressions.xml" />
+ <property name="optional" value="true"/>
+ </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="100"/>
+ <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="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-zA-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="2"/>
+ <property name="braceAdjustment" value="2"/>
+ <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="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="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="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>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 4bba19e1ec7bb1f7b1251f5e1aa67e495ab4f1dd..6860fa09dcffc032b02be0aa94a1da8f0615795e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -44,11 +44,11 @@
<artifactId>maven-checkstyle-plugin</artifactId>
<version>3.2.0</version>
<configuration>
+ <configLocation>config/checkstyle/checkstyle.xml</configLocation>
<consoleOutput>true</consoleOutput>
<includeTestSourceDirectory>true</includeTestSourceDirectory>
<failOnViolation>true</failOnViolation>
<violationSeverity>warning</violationSeverity>
- <configLocation>google_checks.xml</configLocation>
</configuration>
<executions>
<execution>