checkstyle.xml

<?xml version="1.0"?>
<!--
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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
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  http://www.apache.org/licenses/LICENSE-2.0

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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://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<!--
  Checkstyle configuration that checks the sun coding conventions from:
    - the Java Language Specification at
      http://java.sun.com/docs/books/jls/second_edition/html/index.html
    - the Sun Code Conventions at http://java.sun.com/docs/codeconv/
    - the Javadoc guidelines at
      http://java.sun.com/j2se/javadoc/writingdoccomments/index.html
    - the JDK Api documentation http://java.sun.com/j2se/docs/api/index.html
    - some best practices
  Checkstyle is very configurable. Be sure to read the documentation at
  http://checkstyle.sf.net (or in your downloaded distribution).
  Most Checks are configurable, be sure to consult the documentation.
  To completely disable a check, just comment it out or delete it from the file.
  Finally, it is worth reading the documentation.
-->

<module name="Checker">
  <!--
      If you set the basedir property below, then all reported file
      names will be relative to the specified directory. See
      http://checkstyle.sourceforge.net/5.x/config.html#Checker
      <property name="basedir" value="${basedir}"/>
  -->
  <property name="charset" value="UTF-8"/>

  <property name="fileExtensions" value="java, properties, xml"/>

  <!-- Checks that a package-info.java file exists for each package.     -->
  <!-- See http://checkstyle.sf.net/config_javadoc.html#JavadocPackage -->
  <!--<module name="JavadocPackage"/>-->

  <!-- Checks whether files end with a new line.                        -->
  <!-- See http://checkstyle.sf.net/config_misc.html#NewlineAtEndOfFile -->
  <module name="NewlineAtEndOfFile">
    <property name="lineSeparator" value="lf" />
  </module>
  <!-- Checks that property files contain the same keys.         -->
  <!-- See http://checkstyle.sf.net/config_misc.html#Translation -->
  <module name="Translation"/>

  <!-- Checks for Size Violations.                    -->
  <!-- See http://checkstyle.sf.net/config_sizes.html -->
  <module name="FileLength"/>

  <!-- Checks for whitespace                               -->
  <!-- See http://checkstyle.sf.net/config_whitespace.html -->
  <module name="FileTabCharacter"/>

  <!-- Miscellaneous other checks.                   -->
  <!-- See http://checkstyle.sf.net/config_misc.html -->
  <module name="RegexpSingleline">
    <property name="format" value="(?!\*)\s+$|\*\s\s+$"/>
    <property name="minimum" value="0"/>
    <property name="maximum" value="0"/>
    <property name="message" value="Line has trailing spaces."/>
  </module>

  <module name="SuppressWarningsFilter"/>

  <module name="TreeWalker">

    <!-- Checks for Javadoc comments.                     -->
    <!-- See http://checkstyle.sf.net/config_javadoc.html -->
    <module name="AtclauseOrder"/>
    <module name="JavadocMethod">
      <property name="severity" value="warning"/>
    </module>
    <module name="JavadocType"/>
    <module name="JavadocVariable">
      <property name="severity" value="warning"/>
    </module>
    <module name="JavadocStyle"/>
    <module name="NonEmptyAtclauseDescription"/>
    <module name="SingleLineJavadoc"/>
    <module name="WriteTag"/>
    <module name="SummaryJavadoc">
      <property name="severity" value="warning"/>
    </module>

    <!-- Checks for Naming Conventions.                  -->
    <!-- See http://checkstyle.sf.net/config_naming.html -->
    <module name="ConstantName"/>
    <module name="LocalFinalVariableName"/>
    <module name="LocalVariableName"/>
    <module name="MemberName"/>
    <module name="MethodName"/>
    <module name="PackageName"/>
    <module name="ParameterName"/>
    <module name="StaticVariableName"/>
    <module name="TypeName"/>

    <!-- Checks for imports                              -->
    <!-- See http://checkstyle.sf.net/config_import.html -->
    <!--<module name="AvoidStarImport"/>-->
    <module name="IllegalImport"/> <!-- defaults to sun.* packages -->
    <module name="RedundantImport"/>
    <module name="UnusedImports">
      <property name="processJavadoc" value="false"/>
    </module>

    <!-- Checks for Size Violations.                    -->
    <!-- See http://checkstyle.sf.net/config_sizes.html -->
    <module name="LineLength">
      <property name="max" value="120"/>
      <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
    </module>
    <module name="MethodLength"/>
    <!--<module name="ParameterNumber"/>-->

    <!-- Checks for whitespace                               -->
    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
    <module name="EmptyForIteratorPad"/>
    <module name="GenericWhitespace"/>
    <module name="MethodParamPad"/>
    <module name="NoWhitespaceAfter"/>
    <module name="NoWhitespaceBefore"/>
    <module name="OperatorWrap"/>
    <module name="ParenPad"/>
    <module name="TypecastParenPad"/>
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround"/>

    <!-- Modifier Checks                                    -->
    <!-- See http://checkstyle.sf.net/config_modifiers.html -->
    <module name="ModifierOrder"/>
    <module name="RedundantModifier"/>

    <!-- Checks for blocks. You know, those {}'s         -->
    <!-- See http://checkstyle.sf.net/config_blocks.html -->
    <module name="AvoidNestedBlocks"/>
    <module name="EmptyBlock"/>
    <module name="LeftCurly"/>
    <module name="NeedBraces"/>
    <module name="RightCurly"/>

    <!-- Checks for common coding problems               -->
    <!-- See http://checkstyle.sf.net/config_coding.html -->
    <!--<module name="AvoidInlineConditionals"/>-->
    <module name="EmptyStatement"/>
    <module name="EqualsHashCode"/>
    <module name="HiddenField">
      <property name="ignoreSetter" value="true"/>
      <property name="ignoreConstructorParameter" value="true"/>
    </module>
    <module name="IllegalInstantiation"/>
    <module name="InnerAssignment"/>
    <!--<module name="MagicNumber"/>-->
    <module name="MissingSwitchDefault"/>
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>

    <!-- Checks for class design                         -->
    <!-- See http://checkstyle.sf.net/config_design.html -->
    <module name="DesignForExtension"/>
    <module name="FinalClass"/>
    <module name="HideUtilityClassConstructor"/>
    <module name="InterfaceIsType"/>
    <module name="VisibilityModifier"/>

    <!-- Miscellaneous other checks.                   -->
    <!-- See http://checkstyle.sf.net/config_misc.html -->
    <module name="ArrayTypeStyle"/>
    <module name="FinalParameters"/>
    <module name="TodoComment"/>
    <module name="UpperEll"/>

    <module name="SuppressWarningsHolder"/>
  </module>

  <module name="RegexpHeader">
    <property name="headerFile" value="${checkstyle.header.file}"/>
  </module>
</module>