checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
  ~ Copyright 2012 The Netty Project
  ~
  ~ The Netty Project 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
  "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
  "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
<module name="Checker">
  <property name="severity" value="warning"/>

  <!--
  <module name="SuppressionFilter">
    <property name="file" value="checkstyle-suppressions.xml" />
  </module>
  <module name="io.netty.build.checkstyle.SuppressionFilter">
    <property name="pattern" value="((LocalTime|WorldClock)Protocol|LinkedTransferQueue|Version|jzlib/.*|chmv8/.*|com/sun/nio/sctp/.*)\.java" />
  </module>
   -->
  <module name="FileTabCharacter"/>
  <!--
  <module name="JavadocPackage"/>
  -->
  <module name="NewlineAtEndOfFile">
    <property name="lineSeparator" value="lf" />
  </module>
  <!-- Copyright headers -->
  <module name="RegexpSingleline">
    <property name="format" value="^(\s|\*)*Copyright\s.*$"/>
    <property name="minimum" value="1"/>
    <property name="maximum" value="1"/>
    <property name="message" value="missing copyright header"/>
  </module>
  <!-- Unmaintainable Javadoc tags -->
  <module name="RegexpSingleline">
    <property name="format" value="(@(author|version)|\(non-Javadoc\))"/>
    <property name="ignoreCase" value="true"/>
    <property name="message" value="unmaintainable Javadoc tags: @author, @version, or (non-Javadoc)"/>
  </module>
  <!-- IDE-generated comment -->
  <module name="RegexpSingleline">
    <property name="format" value="File \| Settings \| File Templates"/>
    <property name="message" value="IDE-generated comment"/>
  </module>
  <!-- Force UNIX line separator 
  <module name="io.netty.build.checkstyle.NewlineCheck"/>
  -->

  <!-- Trailing whitespace -->
  <module name="RegexpSingleline">
    <property name="format" value="\s+$"/>
    <property name="message" value="trailing whitespace"/>
  </module> 
  <!-- Prohibit consecutive empty lines (except the lines after package/import) -->
  <module name="RegexpMultiline">
    <property name="format" value="\n *(?!package )(?!import )[^\n]+\n{3,}"/>
    <property name="message" value="two or more consecutive empty lines"/>
  </module>
  <!-- Prohibit an empty after { or before } -->
  <module name="RegexpMultiline">
    <property name="format" value="\n\n\s+\}[^\n]{0,10}\n"/>
    <property name="message" value="an empty line before '}'"/>
  </module>
  <module name="RegexpMultiline">
    <property name="format" value="\n\s+[^\n]{1,8}\{\n\n"/>
    <property name="message" value="an empty line after a short line that ends with '{'"/>
  </module>

  <module name="TreeWalker">
    <module name="LineLength">
      <property name="max" value="120"/>
    </module>
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround">
      <property name="tokens" value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, DIV, DIV_ASSIGN, EQUAL, GE, GT, LAND, LCURLY, LE, LITERAL_ASSERT, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL, PLUS, PLUS_ASSIGN, RCURLY, SL, SLIST, SL_ASSIGN, SR, SR_ASSIGN, STAR, STAR_ASSIGN, TYPE_EXTENSION_AND"/>
    </module>
    <!-- Commented out due to false positives.
    <module name="MissingDeprecated"/>
    -->
    <module name="MissingOverride"/>
    <module name="PackageAnnotation"/>
    <module name="EmptyBlock">
      <property name="option" value="text"/>
    </module>
    <module name="LeftCurly"/>
    <module name="RightCurly"/>
    <!--
    <module name="NeedBraces"/>
    -->
    <module name="AvoidNestedBlocks">
      <property name="allowInSwitchCase" value="true"/>
    </module>
    <module name="FinalClass"/>
    <module name="HideUtilityClassConstructor"/>
    <module name="CovariantEquals"/>
    <module name="EmptyStatement"/>
    <module name="EqualsHashCode"/>
    <!--
    <module name="FinalLocalVariable"/>
    -->
    <!-- Commented out due to http://jira.codehaus.org/browse/MCHECKSTYLE-111
    <module name="RedundantThrows">
      <property name="logLoadErrors" value="false"/>
      <property name="suppressLoadErrors" value="true"/>
    </module>
    -->
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>
    <module name="SuperFinalize"/>
    <module name="PackageDeclaration"/>
    <module name="ExplicitInitialization"/>
    <module name="DefaultComesLast"/>
    <module name="UnnecessaryParentheses"/>
    <!--
    <module name="AvoidStarImport">
      <property name="allowStaticMemberImports" value="true"/>
    </module>
    -->
    <module name="RedundantImport"/>
    <!-- Commented out due to false positives.
    <module name="UnusedImports">
      <property name="processJavadoc" value="true"/>
    </module>
    -->
    <module name="JavadocStyle">
      <property name="checkFirstSentence" value="false"/>
    </module>
    <module name="UpperEll"/>
    <module name="ArrayTypeStyle"/>
    <module name="OuterTypeFilename"/>
    <module name="ModifierOrder"/>
    <module name="RedundantModifier"/>
    <module name="GenericWhitespace"/>
    <module name="EmptyForInitializerPad"/>
    <module name="EmptyForIteratorPad"/>
    <module name="MethodParamPad"/>
    <module name="ParenPad"/>
    <module name="TypecastParenPad"/>
    <module name="ParameterName">
      <property name="format" value="^(?!arg[0-9])[_a-z][_a-zA-Z0-9]*$" />
    </module>
  </module>
</module>