fdroid-client/config/checkstyle/checkstyle.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
<module name="Checker">

    <property name="charset" value="UTF-8" />

    <module name="FileTabCharacter" />

    <module name="RegexpSingleline">
        <property name="format" value="\s+$" />
        <property name="message" value="Line has trailing spaces." />
    </module>

    <module name="LineLength">
        <property name="max" value="118" />
        <property name="ignorePattern" value="[a-z]+://" />
    </module>

    <module name="TreeWalker">

        <module name="ConstantName">
            <property name="format" value="^[A-Z_][A-Z0-9]*(_[A-Z0-9]+)*$" />
        </module>
        <module name="LocalFinalVariableName" />
        <module name="LocalVariableName" />
        <module name="MemberName">
            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$" />
        </module>
        <module name="MethodName" />
        <module name="PackageName" />
        <module name="ParameterName" />
        <module name="StaticVariableName" />
        <module name="TypeName" />
        <module name="MethodTypeParameterName" />
        <module name="InterfaceTypeParameterName" />
        <module name="ClassTypeParameterName" />

        <module name="AvoidStarImport" />
        <module name="AvoidStaticImport">
            <property name="excludes"
                value="org.fdroid.fdroid.Assert.*, vendored.org.apache.commons.codec.digest.MessageDigestAlgorithms.*, org.assertj.core.api.Assertions.*, org.junit.Assert.*, org.junit.Assume.*, org.junit.internal.matchers.ThrowableMessageMatcher.*, org.hamcrest.core.IsNot.*, org.hamcrest.CoreMatchers.*, org.hamcrest.Matchers.*, org.springframework.boot.configurationprocessor.ConfigurationMetadataMatchers.*, org.springframework.boot.configurationprocessor.TestCompiler.*, org.mockito.Mockito.*, org.mockito.BDDMockito.*, org.mockito.Matchers.*, org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*, org.springframework.test.web.servlet.result.MockMvcResultMatchers.*, org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.*, org.springframework.security.test.web.servlet.setup.SecurityMockMvcConfigurers.*, org.springframework.hateoas.mvc.ControllerLinkBuilder.linkTo, androidx.test.espresso.Espresso.*, androidx.test.espresso.assertion.ViewAssertions.*, androidx.test.espresso.matcher.ViewMatchers.*, androidx.test.espresso.action.ViewActions.*" />
        </module>
        <module name="RedundantImport" />
        <module name="UnusedImports" />
        <module name="OuterTypeFilename" />

        <module name="Indentation">
            <property name="basicOffset" value="4" />
            <property name="braceAdjustment" value="4" />
            <property name="caseIndent" value="4" />
            <property name="throwsIndent" value="8" />
            <property name="lineWrappingIndentation" value="8" />
            <property name="arrayInitIndent" value="4" />
        </module>
        <module name="CommentsIndentation" />
        <module name="EmptyLineSeparator">
            <property name="allowNoEmptyLineBetweenFields" value="true" />
            <property name="allowMultipleEmptyLines" value="false" />
        </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="NoLineWrap" />

        <module name="OneTopLevelClass" />
        <module name="OneStatementPerLine" />

        <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="EmptyForIteratorPad" />
        <module name="GenericWhitespace" />
        <module name="MethodParamPad" />
        <module name="NoWhitespaceAfter" />
        <module name="NoWhitespaceBefore" />
        <!--<module name="OperatorWrap" />-->
        <module name="ParenPad" />
        <module name="TypecastParenPad" />
        <module name="WhitespaceAfter" />
        <module name="WhitespaceAround" />
        <module name="UnnecessaryParentheses">
            <property name="tokens"
                value="EXPR, IDENT, NUM_DOUBLE, NUM_FLOAT, NUM_INT, NUM_LONG, STRING_LITERAL, LITERAL_NULL, LITERAL_FALSE, LITERAL_TRUE, ASSIGN, BAND_ASSIGN, BOR_ASSIGN, BSR_ASSIGN, BXOR_ASSIGN, DIV_ASSIGN, MINUS_ASSIGN, MOD_ASSIGN, PLUS_ASSIGN, SL_ASSIGN, SR_ASSIGN, STAR_ASSIGN, LAMBDA, TEXT_BLOCK_LITERAL_BEGIN, LOR, LITERAL_INSTANCEOF, GT, LT, GE, LE, EQUAL, NOT_EQUAL, UNARY_MINUS, UNARY_PLUS, INC, DEC, LNOT, BNOT, POST_INC, POST_DEC" />
        </module>

        <module name="ModifierOrder" />
        <module name="RedundantModifier" />
        <module name="AnnotationLocation" />

        <module name="AvoidNestedBlocks" />
        <module name="LeftCurly" />
        <module name="NeedBraces">
            <property name="allowSingleLineStatement" value="true" />
        </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, STATIC_INIT, INSTANCE_INIT" />
        </module>

        <module name="EmptyStatement" />
        <module name="IllegalInstantiation" />
        <module name="InnerAssignment" />
        <module name="DefaultComesLast" />
        <module name="FallThrough" />

        <module name="FinalClass" />

        <module name="ArrayTypeStyle" />
        <module name="UpperEll" />

        <module name="StringLiteralEquality" />
        <module name="EqualsAvoidNull" />

        <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="SuppressWarningsHolder" />

        <module name="SuppressWithNearbyCommentFilter">
            <property name="commentFormat" value="NOCHECKSTYLE ([\w\|]+)" />
            <property name="checkFormat" value="$1" />
            <property name="influenceFormat" value="1" />
        </module>
    </module>
    <module name="SuppressWarningsFilter" />

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