checkstyle.xml

<?xml version="1.0"?>
<!-- 
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * Licensed 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"
        "https://checkstyle.org/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">
    <property name="charset" value="UTF-8"/>

    <!-- Checks whether files end with a new line.                        -->
    <!-- See http://checkstyle.sf.net/config_misc.html#NewlineAtEndOfFile -->
    <!-- module name="NewlineAtEndOfFile"/-->

    <!-- Checks that property files contain the same keys.         -->
    <!-- See http://checkstyle.sf.net/config_misc.html#Translation -->
    <module name="Translation"/>

    <module name="FileLength"/>

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

    <module name="SuppressWarningsFilter" />

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

        <!-- Checks for Naming Conventions.                  -->
        <!-- See http://checkstyle.sf.net/config_naming.html -->
        <module name="ConstantName">
            <property name="format" value="^log(ger)?|[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
        </module>
        <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 Headers                                -->
        <!-- See http://checkstyle.sf.net/config_header.html   -->
        <!-- <module name="Header">                            -->
        <!-- The follow property value demonstrates the ability     -->
        <!-- to have access to ANT properties. In this case it uses -->
        <!-- the ${basedir} property to allow Checkstyle to be run  -->
        <!-- from any directory within a project. See property      -->
        <!-- expansion,                                             -->
        <!-- http://checkstyle.sf.net/config.html#properties        -->
        <!-- <property                                              -->
        <!--     name="headerFile"                                  -->
        <!--     value="${basedir}/java.header"/>                   -->
        <!-- </module> -->

        <!-- Following interprets the header file as regular expressions. -->
        <!-- <module name="RegexpHeader"/>                                -->


        <!-- 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"/>


        <!-- Checks for Size Violations.                    -->
        <!-- See http://checkstyle.sf.net/config_sizes.html -->
<!--
        <module name="LineLength">
            <property name="max" value="110"/>
        </module>
-->
        <module name="MethodLength"/>
        <module name="ParameterNumber">
            <property name="max" value="10"/>
        </module>

        <!-- Checks for whitespace                               -->
        <!-- See http://checkstyle.sf.net/config_whitespace.html -->
        <module name="EmptyForIteratorPad"/>
        <module name="MethodParamPad"/>
        <module name="NoWhitespaceBefore"/>
        <module name="OperatorWrap">
           <property name="tokens" value="QUESTION, COLON, EQUAL, NOT_EQUAL, DIV, MINUS, STAR, MOD, SR, BSR, GE, GT, SL, LE, LT, BXOR, BOR, LOR, BAND, LAND, TYPE_EXTENSION_AND, LITERAL_INSTANCEOF"/>
        </module>
        <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">
            <property name="allowInSwitchCase" value="true"/>
        </module>
        <module name="EmptyBlock"/>
        <module name="LeftCurly"/>
        <module name="NeedBraces">
            <property name="tokens" value=" LITERAL_DO,LITERAL_FOR,LITERAL_WHILE"/>
        </module>
        <module name="RightCurly"/>


        <!-- Checks for common coding problems               -->
        <!-- See http://checkstyle.sf.net/config_coding.html -->
        <module name="ArrayTrailingComma"/>
        <module name="AvoidInlineConditionals"/>
        <module name="CovariantEquals"/>
        <!-- MY FAVOURITE -->
        <module name="EmptyStatement"/>
        <module name="EqualsHashCode"/>
        <module name="EqualsAvoidNull"/>
        <!--module name="HiddenField"/-->
        <module name="IllegalInstantiation"/>
        <module name="IllegalThrows"/>
        <module name="InnerAssignment"/>
        <module name="MultipleVariableDeclarations"/>
        <!--module name="MagicNumber"/-->
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="StringLiteralEquality"/>
        <module name="NestedForDepth">
           <property name="max" value="2"/>
        </module>
        <module name="NestedIfDepth">
           <property name="max" value="3"/>
        </module>
        <module name="NestedTryDepth"/>
        <module name="NoClone"/>
        <module name="NoFinalizer"/>
        <module name="OneStatementPerLine"/>
        <module name="IllegalCatch">
           <property name="illegalClassNames" value=" java.lang.Throwable, java.lang.RuntimeException"/>
        </module>
        <module name="FallThrough"/>
        <module name="UnnecessaryParentheses"/>
        <!--module name="FinalLocalVariable"/-->

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

        <!-- Miscellaneous other checks.                   -->
        <!-- See http://checkstyle.sf.net/config_misc.html -->
        <module name="ArrayTypeStyle"/>
        <module name="Regexp">
            <property name="format" value="System\.(out)|(err)\.print(ln)?\("/>
            <property name="illegalPattern" value="true"/>
        </module>
        <module name="Regexp">
            <property name="format" value="System\.exit"/>
            <property name="illegalPattern" value="true"/>
        </module>
        <module name="Regexp">
            <property name="format" value="\.printStacktrace"/>
            <property name="illegalPattern" value="true"/>
        </module>

        <!--module name="FinalParameters"/-->
        <!--module name="GenericIllegalRegexp">
            <property name="format" value="\s+$"/>
            <property name="message" value="Line has trailing spaces."/>
        </module-->
        <!--module name="TodoComment"/-->
        <module name="UpperEll"/>

	<module name="BooleanExpressionComplexity"/>
    </module>

    <module name="SuppressionFilter">
        <property name="file" value="suppressions.xml"/>
        <property name="optional" value="false"/>
    </module>

</module>