java/checkstyle.xml

<?xml version="1.0" ?>
<!--
  ~ Licensed to the Apache Software Foundation (ASF) under one
  ~ or more contributor license agreements.  See the NOTICE file
  ~ distributed with this work for additional information
  ~ regarding copyright ownership.  The ASF licenses this file
  ~ to you under the Apache License, Version 2.0 (the
  ~ "License"); you may not use this file except in compliance
  ~ with the License.  You may obtain a copy of the License at
  ~
  ~   http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing,
  ~ software distributed under the License is distributed on an
  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  ~ KIND, either express or implied.  See the License for the
  ~ specific language governing permissions and limitations
  ~ under the License.
-->
<!DOCTYPE module PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.2//EN" "https://checkstyle.org/dtds/configuration_1_2.dtd">

<module name="Checker">
  <module name="SuppressionFilter">
    <property name="file" value="checkstyle-suppressions.xml"/>
  </module>
  <module name="FileTabCharacter">
    <property name="eachLine" value="true"/>
  </module>
  <module name="NewlineAtEndOfFile">
  </module>
  <module name="LineLength">
    <property name="max" value="100"/>
    <property name="ignorePattern" value="a href|https://|^ +\* .*$|^ *// .*$|throw new IllegalArgumentException"/>
  </module>
  <module name="RegexpSingleline">
    <property name="format" value="\s+$"/>
    <property name="message" value="No trailing white space allowed."/>
  </module>
  <module name="TreeWalker">
    <module name="OuterTypeFilename"/>
    <module name="CommentsIndentation"/>
    <module name="AvoidStarImport">
      <property name="allowClassImports" value="false"/>
      <property name="allowStaticMemberImports" value="false"/>
    </module>
    <module name="ModifierOrder"/>
    <module name="RedundantModifier"/>
    <module name="NoLineWrap"/>
    <module name="OneStatementPerLine"/>
    <module name="NeedBraces">
      <property name="allowSingleLineStatement" value="true"/>
    </module>
    <module name="UpperEll"/>
    <module name="ArrayTypeStyle"/>
    <module name="RegexpSinglelineJava">
      <property name="format" value="^\s+(&amp;&amp;|[|][|])"/>
      <property name="ignoreComments" value="true"/>
      <property name="message" value="No starting LAND and LOR allowed."/>
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="Collections\.emptySet"/>
      <property name="message" value="Use Set.of() instead." />
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="com\.google\.common\.collect\.Lists"/>
      <property name="message" value="Use Java API instead." />
    </module>
    <module name="Indentation">
      <property name="severity" value="error"/>
      <property name="basicOffset" value="2"/>
      <property name="braceAdjustment" value="0"/>
      <property name="caseIndent" value="2"/>
      <property name="throwsIndent" value="2"/>
      <property name="lineWrappingIndentation" value="4"/>
      <property name="arrayInitIndent" value="2"/>
    </module>
    <module name="IllegalImport">
      <property name="illegalPkgs" value="org.apache.commons.lang" />
    </module>
  </module>
</module>