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

<!--
  Checkstyle configuration that checks the Maven coding conventions from:
  http://maven.apache.org/developers/conventions/code.html
-->

<module name="Checker">

	<!-- Checks that each Java package has a Javadoc file used for commenting. -->
	<!-- See http://checkstyle.sf.net/config_javadoc.html#JavadocPackage       -->
	<!--module name="JavadocPackage">
	  <property name="allowLegacy" value="true"/>
	</module-->

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

	<module name="FileLength"/>

	<!-- Checks for Headers                              -->
	<!-- See http://checkstyle.sf.net/config_header.html -->
	<!--<module name="RegexpHeader">-->
		<!--<property name="fileExtensions" value="java"/>-->
		<!--<property name="headerFile" value="${checkstyle.header.file}"/>-->
	<!--</module>-->

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

	<!-- Line with trailing spaces (disabled as it's too noisy) -->
	<!--<module name="RegexpSingleline">
		<property name="format" value="\s+$"/>
		<property name="message" value="Line has trailing spaces."/>
	</module>-->

	<module name="TreeWalker">

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

		<property name="tabWidth" value="4"/>

		<!-- required for SuppressWarningsFilter (and other Suppress* rules not used here) -->
		<!-- see http://checkstyle.sourceforge.net/config_annotation.html#SuppressWarningsHolder -->
		<module name="SuppressWarningsHolder"/>

		<!-- required for SuppressionCommentFilter -->
		<!-- see http://checkstyle.sourceforge.net/config.html#SuppressionCommentFilter -->
		<module name="FileContentsHolder"/>

		<module name="LeftCurly">
			<property name="option" value="nl"/>
		</module>

		<module name="RightCurly">
			<property name="option" value="alone"/>
		</module>

		<module name="LineLength">
			<property name="max" value="120" />
			<property name="ignorePattern" value="@version|@see|@todo|TODO"/>
		</module>

		<module name="MemberName" />

		<!-- Checks for Javadoc comments.                     -->
		<!-- See http://checkstyle.sf.net/config_javadoc.html -->
		<module name="JavadocMethod">
			<property name="severity" value="warning"/>
			<property name="scope" value="protected"/>
		</module>
		<module name="JavadocType">
			<property name="scope" value="protected"/>
			<property name="allowUnknownTags" value="true" />
		</module>
		<module name="JavadocVariable">
			<property name="severity" value="info"/>
			<property name="scope" value="protected"/>
		</module>


		<!-- Checks for Naming Conventions.                  -->
		<!-- See http://checkstyle.sf.net/config_naming.html -->
		<module name="ConstantName"/>
		<module name="LocalFinalVariableName"/>
		<module name="LocalVariableName"/>
		<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"/>
		<module name="RedundantImport"/>
		<module name="UnusedImports"/>


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


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


		<!-- 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">
			<property name="option" value="text"/>
		</module>
		<module name="NeedBraces"/>


		<!-- 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="severity" value="warning"/>
			<property name="ignoreSetter" value="true"/>
			<property name="ignoreConstructorParameter" value="true"/>
		</module>
		<module name="IllegalInstantiation"/>
		<module name="InnerAssignment"/>
		<module name="MagicNumber">
			<!-- some numbers are really not that magic -->
			<property name="ignoreNumbers" value="-4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 31, 32, 37, 64, 100, 128, 256, 512, 1000, 1024"/>
		</module>
		<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">
			<property name="protectedAllowed" value="true"/>
			<property name="packageAllowed" value="true"/>
		</module>

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

	</module>

	<!-- Support @SuppressWarnings (added in Checkstyle 5.7) -->
	<!-- see http://checkstyle.sourceforge.net/config.html#SuppressWarningsFilter -->
	<module name="SuppressWarningsFilter"/>

	<!-- Checks properties file for a duplicated properties. -->
	<!-- See http://checkstyle.sourceforge.net/config_misc.html#UniqueProperties -->
	<module name="UniqueProperties"/>

	<!-- Support CHECKSTYLE_OFF: regexp and CHECKSTYLE_ON: regexp comments to disable/enable some checks -->
	<!-- see http://checkstyle.sourceforge.net/config.html#SuppressionCommentFilter -->
	<module name="SuppressionCommentFilter">
		<property name="offCommentFormat" value="CHECKSTYLE_OFF\: (.+)"/>
		<property name="onCommentFormat" value="CHECKSTYLE_ON\: (.+)"/>
		<property name="checkFormat" value="$1"/>
	</module>

</module>