src/etc/checkstyle/checkstyle-config

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN" "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<!--
   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

     https://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.
-->
<module name="Checker">
  <!-- required licence file -->
  <module name="Header">
    <property name="headerFile" value="${checkstyle.src.dir}/RequiredHeader.txt"/>
    <property name="ignoreLines" value="2"/>
  </module>

  <!-- Items moved out of TreeWalker for new versions of Checkstyle -->
  <module name="FileLength"/>
  <module name="FileTabCharacter"/>

  <module name="TreeWalker">
    <!-- Javadoc requirements -->
    <module name="JavadocType">
      <property name="scope" value="protected"/>
    </module>
    <module name="JavadocMethod">
      <property name="scope" value="protected"/>
      <property name="allowUndeclaredRTE" value="true"/>
    </module>
    <module name="JavadocVariable">
       <property name="scope" value="public"/>
    </module>

    <!-- element naming -->
    <module name="PackageName"/>
    <module name="TypeName"/>
    <module name="ConstantName"/>
    <module name="LocalFinalVariableName"/>
    <module name="LocalVariableName"/>
    <module name="MemberName"/>
    <module name="MethodName"/>
    <module name="ParameterName"/>
    <module name="StaticVariableName"/>

    <!-- Import conventions -->
    <module name="AvoidStarImport"/>
    <module name="IllegalImport"/>
    <module name="RedundantImport"/>
    <module name="UnusedImports"/>

    <!-- size limits -->
    <module name="LineLength">
      <property name="max" value="100"/>
      <property name="ignorePattern" value="^ *\* *[^ ]+$"/>
      <property name="tabWidth" value="4"/>
    </module>
    <module name="MethodLength"/>
    <module name="ParameterNumber"/>

    <!-- whitespace checks -->
    <module name="EmptyForIteratorPad"/>
    <module name="NoWhitespaceAfter"/>
    <module name="NoWhitespaceBefore"/>
    <module name="OperatorWrap"/>
    <module name="ParenPad"/>
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround"/>

    <!-- Modifier Checks -->
    <module name="ModifierOrder"/>
    <module name="RedundantModifier"/>

    <!-- Checks for blocks -->
    <module name="AvoidNestedBlocks"/>
    <module name="EmptyBlock">
      <property name="option" value="text"/>
    </module>
    <module name="LeftCurly"/>
    <module name="NeedBraces"/>
    <module name="RightCurly"/>

    <!-- Checks for common coding problems -->
    <!-- <module name="AvoidInlineConditionals"/> -->
    <!-- <module name="DoubleCheckedLocking"/> --> <!-- removed in checkstyle 5.6 -->
    <module name="EmptyStatement"/>
    <module name="EqualsHashCode"/>
    <module name="IllegalInstantiation">
      <property name="classes" value="java.lang.Boolean"/>
    </module>
    <module name="InnerAssignment"/>
    <module name="MagicNumber"/>
    <module name="MissingSwitchDefault"/>
    <!-- Allow redundant throw declarations for doc purposes
    <module name="RedundantThrows">
      <property name="allowUnchecked" value="true"/>
    </module>
    -->
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>

    <!-- Checks for class design -->
    <!-- <module name="DesignForExtension"/> -->
    <module name="FinalClass"/>
    <module name="HideUtilityClassConstructor"/>
    <module name="InterfaceIsType"/>
    <module name="VisibilityModifier"/>

    <!-- Miscellaneous other checks. -->
    <module name="ArrayTypeStyle"/>
    <!-- <module name="TodoComment"/> -->
    <module name="UpperEll"/>
    <!-- allow comment suppression of checks -->
    <module name="FileContentsHolder"/>
    <!--
    <module name="GenericIllegalRegexp">
      <property name="format" value="\s+$"/>
      <property name="message" value="Line has trailing spaces."/>
    </module>
    -->
  </module>

  <module name="RegexpSingleline">
    <!-- \s matches whitespace character, $ matches end of line. -->
    <property name="format" value="\s+$"/>
  </module>

  <!-- <module name="au.com.redhillconsulting.simian.SimianCheck"/> -->
  <module name="SuppressionCommentFilter">
    <property name="offCommentFormat" value="CheckStyle\:([\w\|]+) *OFF"/>
    <property name="onCommentFormat" value="CheckStyle\:([\w\|]+) *ON"/>
    <property name="checkFormat" value="$1"/>
  </module>

  <module name="SuppressionFilter">
    <property name="file" value="${checkstyle.src.dir}/checkstyle-suppress.xml"/>
  </module>

</module>