checkstyle.xml

<?xml version="1.0"?>
<!--
  ~ Copyright 2019 Patriot project
  ~
  ~    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 1.3//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<module name="Checker">

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

    <module name="TreeWalker">
        <!-- Checks for Javadoc comments.                     -->
        <!-- See http://checkstyle.sf.net/config_javadoc.html -->
        <module name="JavadocMethod">
            <property name="scope" value="public"/>
            <property name="allowMissingPropertyJavadoc" value="true"/>
            <property name="severity" value="warning"/>
        </module>
        <module name="JavadocType">
            <property name="scope" value="public"/>
            <property name="severity" value="warning"/>
        </module>
        <module name="JavadocStyle">
            <property name="scope" value="public"/>
            <property name="checkFirstSentence" value="false"/>
            <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">
            <property name="severity" value="warning"/>
        </module>
        <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="120"/>
        </module>
        <module name="MethodLength">
            <property name="max" value="30"/>
            <property name="countEmpty" value="false"/>
        </module>
        <module name="ParameterNumber"/>

        <!-- Modifier Checks                                    -->
        <!-- See http://checkstyle.sf.net/config_modifier.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="LeftCurly">
            <property name="option" value="eol"/>
        </module>
        <module name="NeedBraces">
            <property name="allowSingleLineStatement" value="true"/>
        </module>
        <module name="RightCurly"/>

        <!-- Checks for common coding problems               -->
        <!-- See http://checkstyle.sf.net/config_coding.html -->
        <module name="EmptyStatement"/>
        <module name="EqualsHashCode"/>
        <module name="MissingSwitchDefault"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>

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

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