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
    "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
    "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">

<module name="Checker">

  <property name="localeLanguage" value="en"/>
  <property name="charset" value="UTF-8"/>
  <property name="severity" value="error"/>
  <property name="fileExtensions" value="java, groovy, properties, xml"/>

  <!-- Verify that EVERY source file has the appropriate license -->
  <module name="RegexpHeader">
    <property name="headerFile" value="java.header.regex"/>
    <property name="multiLines" value="10"/>
    <property name="fileExtensions" value="java, groovy"/>
  </module>

  <!-- Miscellaneous -->
  <module name="FileTabCharacter">
    <!-- No tabs allowed! -->
    <property name="fileExtensions" value="java, groovy, xml, xsd, dtd, htm, html, txt, properties"/>
  </module>
  <module name="NewlineAtEndOfFile"/>
  <module name="RegexpMultiline">
    <!-- No more than 2 blank lines allowed. -->
    <property name="format" value="\r?\n[\t ]*\r?\n[\t ]*\r?\n[\t ]*\r?\n"/>
    <property name="fileExtensions" value="java, xml, properties"/>
    <property name="message" value="Unnecessary consecutive lines"/>
  </module>
  <!--<module name="RegexpOnFilename">-->
    <!--<property name="folderPattern" value="[\\/]src[\\/]\w+[\\/]java[\\/]"/>-->
    <!--<property name="fileNamePattern" value="\.java$"/>-->
    <!--<property name="match" value="false"/>-->
    <!--<message key="regexp.filepath.mismatch" value="Only java files should be located in the ''src/*/java'' folders."/>-->
  <!--</module>-->
  <module name="UniqueProperties">
    <property name="fileExtensions" value="properties"/>
  </module>

  <!-- Size Violations -->
  <module name="FileLength">
    <property name="fileExtensions" value="java, groovy"/>
  </module>

  <module name="TreeWalker">

    <!-- Annotations -->
    <!--<module name="MissingDeprecated"/>-->
    <module name="MissingOverride"/>

    <!-- Block checks -->
    <module name="AvoidNestedBlocks"/>
    <module name="EmptyBlock"/>
    <module name="EmptyCatchBlock">
      <property name="exceptionVariableName" value="expected|ignore"/>
    </module>
    <!--<module name="LeftCurly"/>-->
    <!--<module name="RightCurly"/>-->
    <module name="NeedBraces"/>

    <!--Class Design-->
    <!--<module name="FinalClass"/>-->
    <!--<module name="HideUtilityClassConstructor"/>--> <!--need to change 25 class APIs-->
    <module name="InterfaceIsType"/> <!-- Interfaces must be types (not just constants) -->
    <module name="MutableException"/>
    <module name="OneTopLevelClass"/>
    <module name="ThrowsCount">
      <property name="max" value="5"/>
      <property name="ignorePrivateMethods" value="false"/>
    </module>

    <!-- Coding -->
    <module name="CovariantEquals"/>
    <!-- Require hash code override when equals is -->
    <module name="EqualsHashCode"/>
    <module name="IllegalInstantiation">
      <property name="classes" value="java.lang.Boolean"/>
    </module>
    <module name="IllegalThrows"/>
    <module name="MissingSwitchDefault"/>
    <module name="ModifiedControlVariable"/>
    <module name="MultipleVariableDeclarations"/>
    <module name="NestedForDepth"/>
    <module name="NestedIfDepth">
      <!-- TODO: reduce this number -->
      <property name="max" value="4"/>
    </module>
    <module name="NestedTryDepth">
      <property name="max" value="2"/>
    </module>
    <module name="OneStatementPerLine"/>
    <!--<module name="ParameterAssignment"/>-->
    <module name="ReturnCount">
      <!-- TODO: reduce these numbers -->
      <property name="max" value="9" />
      <property name="maxForVoid" value="9"/>
    </module>
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>
    <module name="StringLiteralEquality"/>
    <module name="SuperFinalize"/>
    <module name="UnnecessaryParentheses"/>
    <!--<module name="VariableDeclarationUsageDistance"/>-->

    <!-- Imports -->
    <module name="AvoidStarImport">
      <property name="allowClassImports" value="false"/>
      <property name="allowStaticMemberImports" value="false"/>
    </module>
    <module name="RedundantImport"/>
    <module name="UnusedImports"/>
   <module name="ImportOrder">
      <property name="groups" value="/^java\./,javax,org,net,com"/>
      <property name="ordered" value="true"/>
      <property name="separated" value="true"/>
      <property name="option" value="top"/>
     <property name="sortStaticImportsAlphabetically" value="true"/>
    </module>

    <!-- JavaDocs -->
<!--
    <module name="JavadocMethod">
      <property name="minLineCount" value="3"/>
      <property name="scope" value="protected"/>
      <property name="allowUndeclaredRTE" value="true"/>
      <property name="allowMissingThrowsTags" value="true"/>
      <property name="allowMissingPropertyJavadoc" value="true"/>
      <property name="ignoreMethodNamesRegex" value="(get|set|is).*"/>
      &lt;!&ndash; Only check methods, i.e. ignore constructors  &ndash;&gt;
      <property name="tokens" value="METHOD_DEF"/>
    </module>
    -->
    <!--<module name="NonEmptyAtclauseDescription"/>-->

    <!-- Misc -->
    <module name="ArrayTypeStyle"/>
    <module name="AvoidEscapedUnicodeCharacters"/>
    <!--<module name="CommentsIndentation"/>-->
    <module name="OuterTypeFilename"/>
    <module name="UpperEll"/>

    <!-- code metrics -->
    <!--<module name="BooleanExpressionComplexity"/>-->
    <!--<module name="ClassFanOutComplexity"/>-->
    <!--<module name="CyclomaticComplexity"/>-->
    <!--<module name="NPathComplexity"/>-->

    <!--
    Allow comment to suppress checkstyle for a single line
    e.g. // CHECKSTYLE IGNORE MagicNumber
    -->
    <module name="SuppressWithNearbyCommentFilter">
      <property name="commentFormat" value="CHECKSTYLE IGNORE (\w+)"/>
      <property name="checkFormat" value="$1"/>
    </module>
  </module>

  <module name="SuppressionFilter">
    <!-- config_loc is used by Eclipse plugin -->
    <property name="file" value="${config_loc}/checkstyle-suppressions.xml"/>
  </module>

</module>