checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
###############################################################################
#
# Copyright IBM Corp. 2023, 2026
#
# This code is free software; you can redistribute it and/or modify it
# under the terms provided by IBM in the LICENSE file that accompanied
# this code, including the "Classpath" Exception described therein.
###############################################################################
-->
<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
    <module name="FileTabCharacter"/>
    <module name="NewlineAtEndOfFile"/>
    <module name="RegexpSingleline">
        <property name="format" value="[^\x00-\x7F]"/>
        <property name="message" value="Non-ASCII character found. Use ASCII equivalents in source files (e.g. use '-' instead of em-dash, '->' instead of arrow characters)."/>
        <property name="fileExtensions" value="java"/>
    </module>
    <module name="RegexpHeader">
        <property name="fileExtensions" value="java"/>
        <property name="header" value="^\W.*\n^.*Copyright IBM Corp\. \d\d\d\d\n^\W.*\n^\W.*. This code is free software; you can redistribute it and/or modify it\n^\W.*. under the terms provided by IBM in the LICENSE file that accompanied\n^\W.*. this code, including the &quot;Classpath&quot; Exception described therein."/>
    </module>
    <module name="RegexpSingleline">
        <property name="format" value="\s+$"/>
        <property name="message" value="Trailing whitespace"/>
        <property name="severity" value="error"/>
    </module>
    <module name="TreeWalker">
        <property name="fileExtensions" value="java"/>
        <module name="AvoidStarImport"/>
        <module name="EmptyBlock"/>
        <module name="EmptyLineSeparator">
            <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
            <property name="allowNoEmptyLineBetweenFields" value="true"/>
        </module>
        <module name="GenericWhitespace"/>
        <module name="ImportOrder"/>
        <module name="Indentation">
            <property name="arrayInitIndent" value="8"/>
            <property name="caseIndent" value="4"/>
        </module>
        <module name="LeftCurly"/>
        <module name="NoWhitespaceAfter"/>
        <module name="NoWhitespaceBefore"/>
        <module name="RedundantImport"/>
        <module name="RightCurly"/>
        <module name="StringLiteralEquality"/>
        <module name="StringLiteralEquality"/>
        <module name="UnusedImports"/>
        <module name="UnusedLocalVariable"/>
        <module name="WhitespaceAfter"/>
        <module name="WhitespaceAround">
          <property name="allowEmptyConstructors" value="true"/>
        </module>
    </module>
</module>