checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">

<module name="Checker">

  <module name="RegexpHeader">
    <property
       name="header"
       value="^/\*$\n^ \* Licensed under the Apache License, Version 2.0 *"/>
  </module>

  <module name="NewlineAtEndOfFile"/>
  <module name="FileTabCharacter"/>

  <module name="SuppressWithNearbyCommentFilter">
    <property name="commentFormat" value="CHECKSTYLE IGNORE LINE\: ([\w\|]+)"/>
    <property name="checkFormat" value="$1"/>
    <property name="influenceFormat" value="1"/>
  </module>

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

  <module name="TreeWalker">

    <module name="FileContentsHolder"/>

    <!-- Javadoc Comments. -->
    <module name="JavadocType">
      <property name="scope" value="anoninner"/>
    </module>
    <module name="JavadocMethod">
      <property name="scope" value="package"/>
      <property name="allowMissingParamTags" value="true"/>
      <property name="allowMissingReturnTag" value="true"/>
      <property name="allowUndeclaredRTE" value="true"/>
      <property name="suppressLoadErrors" value="true"/>
    </module>
    <module name="JavadocVariable">
      <property name="scope" value="package"/>
    </module>

    <module name="JavadocStyle">
      <property name="scope" value="anoninner"/>
      <property name="checkEmptyJavadoc" value="true"/>
    </module>

    <!-- Naming Conventions. -->
    <module name="ConstantName"/>
    <module name="ClassTypeParameterName"/>
    <module name="LocalFinalVariableName"/>
    <module name="LocalVariableName"/>
    <module name="MemberName"/>
    <module name="MethodName"/>
    <module name="MethodTypeParameterName"/>
    <module name="ParameterName"/>
    <module name="StaticVariableName"/>
    <module name="TypeName"/>
    <module name="PackageName">
        <property name="format" value="^io\.github\.zlika\.reproducible(\.[a-z][a-z0-9_]*)*$"/>
    </module>
    <module name="HiddenField">
      <property name="ignoreConstructorParameter" value="true"/>
    </module>

    <!-- Imports. -->
    <module name="AvoidStarImport"/>
    <module name="RedundantImport"/>
    <module name="UnusedImports"/>
    <module name="ImportOrder">
      <property name="ordered" value="true"/>
      <property name="separated" value="true"/>
      <property name="caseSensitive" value="true"/>
    </module>
    <module name="AvoidStaticImport"/>

    <!-- Layout and whitespace. -->
    <module name="Indentation"/>
    <module name="LineLength">
      <property name="max" value="120"/>
      <property name="ignorePattern" value="(^import +)|(^ *\* *[^ ]+$)|(^ *\* *@see)|(^ *\* *@author)|(^ *\* *\$Id)"/>
    </module>
    <module name="EmptyForInitializerPad"/>
    <module name="EmptyForIteratorPad"/>
    <module name="MethodParamPad"/>
    <module name="NoWhitespaceBefore"/>
    <module name="ParenPad"/>
    <module name="TypecastParenPad"/>
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround"/>
    <module name="GenericWhitespace"/>
    <module name="NoWhitespaceAfter">
      <property name="tokens" value="BNOT, DEC, DOT, INC, LNOT, UNARY_MINUS, UNARY_PLUS"/>
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="^(?!(?:[ \t]*?(?:\/?\*\*?|\/\/)[\S \t]+?|[ \t]+$))[\S \t]+[ \t]+$"/>
      <property name="message" value="Trailing whitespace"/>
    </module>
    <module name="OperatorWrap"/>

    <!-- Structure. -->
    <module name="ModifierOrder"/>
    <module name="RedundantModifier">
        <property name="tokens" value="METHOD_DEF,VARIABLE_DEF,ANNOTATION_FIELD_DEF,INTERFACE_DEF"/>
    </module>
    <module name="DeclarationOrder"/>
    <module name="MultipleVariableDeclarations"/>
    <module name="OneStatementPerLine"/>
    <module name="NeedBraces"/>
    <module name="LeftCurly">
        <property name="option" value="nl"/>
    </module>
    <module name="RightCurly">
        <property name="option" value="alone"/>
    </module>
    <module name="AvoidNestedBlocks"/>
    <module name="EmptyStatement"/>

    <!-- Common coding and design errors. -->
    <module name="CovariantEquals"/>
    <module name="EqualsHashCode"/>
    <module name="IllegalInstantiation">
      <property name="classes" value="java.lang.Boolean,java.lang.Short,java.lang.Integer,java.lang.Long,java.lang.Float,java.lang.Double"/>
    </module>
    <module name="MissingSwitchDefault"/>
    <module name="DefaultComesLast"/>
    <module name="FallThrough"/>
    <module name="StringLiteralEquality"/>
    <module name="EqualsAvoidNull"/>
    <module name="IllegalCatch"/>
    <module name="IllegalThrows"/>
    <module name="ParameterAssignment"/>
    <module name="EmptyBlock">
      <property name="option" value="text"/>
    </module>
    <module name="HideUtilityClassConstructor"/>
    <module name="RegexpSinglelineJava">
      <property name="format" value="System\.out\.print"/>
      <property name="message" value="Consider using logging instead of System.out.println"/>
      <property name="ignoreComments" value="true"/>
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="System\.err\.print"/>
      <property name="message" value="Consider using logging instead of System.err.println"/>
      <property name="ignoreComments" value="true"/>
    </module>

    <!-- Quality metrics. -->
    <module name="ExecutableStatementCount">
      <property name="max" value="40"/>
    </module>
    <module name="MethodLength"/>
    <module name="AnonInnerLength">
      <property name="max" value="40"/>
    </module>
    <module name="ParameterNumber">
      <property name="max" value="5"/>
    </module>
    <module name="OuterTypeNumber"/>
    <module name="ReturnCount">
      <property name="max" value="4"/>
    </module>
    <module name="ThrowsCount">
      <property name="max" value="3"/>
    </module>
    <module name="BooleanExpressionComplexity">
      <property name="tokens" value="LAND,LOR"/>
    </module>
    <module name="ClassDataAbstractionCoupling">
      <property name="max" value="20"/>
    </module>
    <module name="ClassFanOutComplexity">
        <property name="max" value="25"/>
    </module>
    <module name="NestedIfDepth">
      <property name="max" value="3"/>
    </module>
    <module name="NestedTryDepth"/>
    <module name="CyclomaticComplexity">
      <property name="max" value="15"/>
    </module>
    <module name="NPathComplexity"/>

  </module>
</module>