checkstyle-checker.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_2.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">

    <property name="severity" value="error"/>

    <module name="SuppressionFilter">
        <property name="file" value="checkstyle-suppressions.xml"/>
    </module>

    <module name="FileTabCharacter">
        <property name="eachLine" value="true"/>
    </module>

    <module name="FileLength">
        <property name="fileExtensions" value="java"/>
    </module>

    <module name="RegexpSingleline">
        <property name="format" value="\s+$"/>
        <property name="message" value="Trailing whitespace detected"/>
        <property name="minimum" value="0"/>
        <property name="maximum" value="0"/>
    </module>

    <module name="TreeWalker">
        <property name="cacheFile" value="${checkstyle.cache.file}"/>
        <property name="tabWidth" value="4"/>

        <module name="AvoidStarImport"/>
        <module name="EmptyForIteratorPad"/>
        <module name="GenericWhitespace"/>
        <module name="IllegalImport"/>
        <module name="IllegalInstantiation"/>
        <module name="ImportOrder"/>
        <module name="LeftCurly"/>
        <module name="LineLength">
            <property name="max" value="160"/>
        </module>
        <module name="MethodLength">
            <property name="max" value="200"/>
            <property name="countEmpty" value="false"/>
        </module>
        <module name="MethodParamPad"/>
        <module name="MissingDeprecated"/>
        <module name="MissingOverride"/>
        <module name="ModifiedControlVariable"/>
        <module name="NeedBraces"/>
        <module name="NestedIfDepth">
            <property name="max" value="4"/>
        </module>
        <module name="NestedTryDepth">
            <property name="max" value="3"/>
        </module>
        <module name="NoWhitespaceAfter">
            <property name="tokens" value="BNOT, DEC, DOT, INC, LNOT, UNARY_MINUS, UNARY_PLUS"/>
        </module>
        <module name="NoWhitespaceBefore">
            <property name="tokens" value="DOT"/>
            <property name="allowLineBreaks" value="true"/>
        </module>
        <module name="OneStatementPerLine"/>
        <module name="OperatorWrap">
            <property name="tokens" value="ASSIGN, DIV_ASSIGN, PLUS_ASSIGN, MINUS_ASSIGN, STAR_ASSIGN, MOD_ASSIGN, SR_ASSIGN, BSR_ASSIGN, SL_ASSIGN, BXOR_ASSIGN, BOR_ASSIGN, BAND_ASSIGN"/>
            <property name="option" value="eol"/>
        </module>
        <module name="OuterTypeFilename"/>
        <module name="OuterTypeNumber"/>
        <module name="PackageAnnotation"/>
        <module name="PackageDeclaration"/>
        <module name="PackageName"/>
        <module name="ParameterNumber">
            <property name="id" value="paramNum"/>
            <property name="max" value="20"/>
        </module>
        <module name="ParenPad"/>
        <module name="RedundantImport"/>
        <module name="RightCurly"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="StringLiteralEquality"/>
        <module name="SuppressWarnings"/>
        <module name="TypecastParenPad"/>
        <module name="TypeName">
            <property name="format" value="^[A-Z][a-zA-Z0-9_]*$"/>
        </module>
        <module name="UnusedImports"/>
        <module name="WhitespaceAfter"/>
        <module name="WhitespaceAround">
            <property name="allowEmptyConstructors" value="true"/>
            <property name="allowEmptyMethods" value="true"/>
        </module>
    </module>
</module>