From 272eaf0a6cb89adb5e2c456d00d8fd2573f9a583 Mon Sep 17 00:00:00 2001
From: Daniel Gerhardt <code@dgerhardt.net>
Date: Thu, 29 Nov 2018 11:45:22 +0100
Subject: [PATCH] Use Google Java Style Guide as base for Checkstyle

Updated Checkstyle to version 8.14 to support all rules.
---
 ARSnova-checkstyle-checker.xml | 194 ------------------------
 checkstyle.xml                 | 265 +++++++++++++++++++++++++++++++++
 pom.xml                        |  10 +-
 3 files changed, 274 insertions(+), 195 deletions(-)
 delete mode 100644 ARSnova-checkstyle-checker.xml
 create mode 100644 checkstyle.xml

diff --git a/ARSnova-checkstyle-checker.xml b/ARSnova-checkstyle-checker.xml
deleted file mode 100644
index a589cfacc..000000000
--- a/ARSnova-checkstyle-checker.xml
+++ /dev/null
@@ -1,194 +0,0 @@
-<?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">
-    <!--
-        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}"/>
-    -->
-
-    <!-- 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"/>
-
-    <!-- Checks that property files contain the same keys.         -->
-    <!-- See http://checkstyle.sf.net/config_misc.html#Translation -->
-    <module name="Translation"/>
-
-    <module name="FileLength"/>
-
-    <!-- Following interprets the header file as regular expressions. -->
-    <!-- <module name="RegexpHeader"/>                                -->
-
-    <!--module name="FileTabCharacter">
-        <property name="eachLine" value="true"/>
-    </module-->
-
-    <module name="RegexpSingleline">
-        <!-- \s matches whitespace character, $ matches end of line. -->
-        <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"/>
-
-        <!-- Checks for Javadoc comments.                     -->
-        <!-- See http://checkstyle.sf.net/config_javadoc.html -->
-        <!-- module name="JavadocMethod">
-        	<property name="allowMissingJavadoc" value="true"/>
-        </module>
-        <module name="JavadocType"/>
-        <module name="JavadocVariable"/>
-        <module name="JavadocStyle"/-->
-
-
-        <!-- 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 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> -->
-
-
-        <!-- 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="120" />
-        </module>
-        <module name="MethodLength"/>
-        <module name="ParameterNumber"/>
-
-
-        <!-- Checks for whitespace                               -->
-        <!-- See http://checkstyle.sf.net/config_whitespace.html -->
-        <module name="EmptyForIteratorPad"/>
-        <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="DoubleCheckedLocking"/-->    <!-- MY FAVOURITE -->
-        <module name="EmptyStatement"/>
-        <module name="EqualsHashCode"/>
-        <module name="HiddenField">
-        	<property name="ignoreSetter" value="true"/>
-        </module>
-        <module name="IllegalInstantiation"/>
-        <module name="InnerAssignment"/>
-        <module name="MagicNumber"/>
-        <module name="MissingSwitchDefault"/>
-        <!-- module name="RedundantThrows"/ -->
-        <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>
-
-</module>
diff --git a/checkstyle.xml b/checkstyle.xml
new file mode 100644
index 000000000..c9a605c89
--- /dev/null
+++ b/checkstyle.xml
@@ -0,0 +1,265 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+		"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+		"https://checkstyle.org/dtds/configuration_1_3.dtd">
+
+<!--
+	Checkstyle configuration that checks the Google coding conventions from Google Java Style
+	that can be found at https://google.github.io/styleguide/javaguide.html.
+
+	Checkstyle is very configurable. Be sure to read the documentation at
+	http://checkstyle.sf.net (or in your downloaded distribution).
+
+	To completely disable a check, just comment it out or delete it from the file.
+
+	Authors: Max Vetrenko, Ruslan Diachenko, Roman Ivanov.
+-->
+
+<module name="Checker">
+	<property name="charset" value="UTF-8"/>
+
+	<property name="severity" value="warning"/>
+
+	<property name="fileExtensions" value="java, properties, xml"/>
+	<!-- Excludes all 'module-info.java' files              -->
+	<!-- See https://checkstyle.org/config_filefilters.html -->
+	<module name="BeforeExecutionExclusionFileFilter">
+		<property name="fileNamePattern" value="module\-info\.java$"/>
+	</module>
+	<!-- Checks for whitespace                               -->
+	<!-- See http://checkstyle.sf.net/config_whitespace.html -->
+	<module name="FileTabCharacter">
+		<property name="eachLine" value="true"/>
+	</module>
+
+	<module name="TreeWalker">
+		<module name="OuterTypeFilename"/>
+		<module name="IllegalTokenText">
+			<property name="tokens" value="STRING_LITERAL, CHAR_LITERAL"/>
+			<property name="format"
+					value="\\u00(09|0(a|A)|0(c|C)|0(d|D)|22|27|5(C|c))|\\(0(10|11|12|14|15|42|47)|134)"/>
+			<property name="message"
+					value="Consider using special escape sequence instead of octal value or Unicode escaped value."/>
+		</module>
+		<module name="AvoidEscapedUnicodeCharacters">
+			<property name="allowEscapesForControlCharacters" value="true"/>
+			<property name="allowByTailComment" value="true"/>
+			<property name="allowNonPrintableEscapes" value="true"/>
+		</module>
+		<module name="LineLength">
+			<property name="max" value="100"/>
+			<property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
+		</module>
+		<module name="AvoidStarImport"/>
+		<module name="OneTopLevelClass"/>
+		<module name="NoLineWrap"/>
+		<module name="EmptyBlock">
+			<property name="option" value="TEXT"/>
+			<property name="tokens"
+					value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
+		</module>
+		<module name="NeedBraces"/>
+		<module name="LeftCurly"/>
+		<module name="RightCurly">
+			<property name="id" value="RightCurlySame"/>
+			<property name="tokens"
+					value="LITERAL_TRY, LITERAL_CATCH, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE,
+						LITERAL_DO"/>
+		</module>
+		<module name="RightCurly">
+			<property name="id" value="RightCurlyAlone"/>
+			<property name="option" value="alone"/>
+			<property name="tokens"
+					value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, STATIC_INIT,
+						INSTANCE_INIT"/>
+		</module>
+		<module name="WhitespaceAround">
+			<property name="allowEmptyConstructors" value="true"/>
+			<property name="allowEmptyLambdas" value="true"/>
+			<property name="allowEmptyMethods" value="true"/>
+			<property name="allowEmptyTypes" value="true"/>
+			<property name="allowEmptyLoops" value="true"/>
+			<message key="ws.notFollowed"
+					value="WhitespaceAround: ''{0}'' is not followed by whitespace. Empty blocks may only be represented as '{}' when not part of a multi-block statement (4.1.3)"/>
+			<message key="ws.notPreceded"
+					value="WhitespaceAround: ''{0}'' is not preceded with whitespace."/>
+		</module>
+		<module name="OneStatementPerLine"/>
+		<module name="MultipleVariableDeclarations"/>
+		<module name="ArrayTypeStyle"/>
+		<module name="MissingSwitchDefault"/>
+		<module name="FallThrough"/>
+		<module name="UpperEll"/>
+		<module name="ModifierOrder"/>
+		<module name="EmptyLineSeparator">
+			<property name="allowNoEmptyLineBetweenFields" value="true"/>
+		</module>
+		<module name="SeparatorWrap">
+			<property name="id" value="SeparatorWrapDot"/>
+			<property name="tokens" value="DOT"/>
+			<property name="option" value="nl"/>
+		</module>
+		<module name="SeparatorWrap">
+			<property name="id" value="SeparatorWrapComma"/>
+			<property name="tokens" value="COMMA"/>
+			<property name="option" value="EOL"/>
+		</module>
+		<module name="SeparatorWrap">
+			<!-- ELLIPSIS is EOL until https://github.com/google/styleguide/issues/258 -->
+			<property name="id" value="SeparatorWrapEllipsis"/>
+			<property name="tokens" value="ELLIPSIS"/>
+			<property name="option" value="EOL"/>
+		</module>
+		<module name="SeparatorWrap">
+			<!-- ARRAY_DECLARATOR is EOL until https://github.com/google/styleguide/issues/259 -->
+			<property name="id" value="SeparatorWrapArrayDeclarator"/>
+			<property name="tokens" value="ARRAY_DECLARATOR"/>
+			<property name="option" value="EOL"/>
+		</module>
+		<module name="SeparatorWrap">
+			<property name="id" value="SeparatorWrapMethodRef"/>
+			<property name="tokens" value="METHOD_REF"/>
+			<property name="option" value="nl"/>
+		</module>
+		<module name="PackageName">
+			<property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
+			<message key="name.invalidPattern"
+					value="Package name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="TypeName">
+			<message key="name.invalidPattern"
+					value="Type name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="MemberName">
+			<property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/>
+			<message key="name.invalidPattern"
+					value="Member name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="ParameterName">
+			<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+			<message key="name.invalidPattern"
+					value="Parameter name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="LambdaParameterName">
+			<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+			<message key="name.invalidPattern"
+					value="Lambda parameter name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="CatchParameterName">
+			<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+			<message key="name.invalidPattern"
+					value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="LocalVariableName">
+			<property name="tokens" value="VARIABLE_DEF"/>
+			<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+			<message key="name.invalidPattern"
+					value="Local variable name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="ClassTypeParameterName">
+			<property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+			<message key="name.invalidPattern"
+					value="Class type name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="MethodTypeParameterName">
+			<property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+			<message key="name.invalidPattern"
+					value="Method type name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="InterfaceTypeParameterName">
+			<property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+			<message key="name.invalidPattern"
+					value="Interface type name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="NoFinalizer"/>
+		<module name="GenericWhitespace">
+			<message key="ws.followed"
+					value="GenericWhitespace ''{0}'' is followed by whitespace."/>
+			<message key="ws.preceded"
+					value="GenericWhitespace ''{0}'' is preceded with whitespace."/>
+			<message key="ws.illegalFollow"
+					value="GenericWhitespace ''{0}'' should followed by whitespace."/>
+			<message key="ws.notPreceded"
+					value="GenericWhitespace ''{0}'' is not preceded with whitespace."/>
+		</module>
+		<module name="Indentation">
+			<property name="basicOffset" value="2"/>
+			<property name="braceAdjustment" value="0"/>
+			<property name="caseIndent" value="2"/>
+			<property name="throwsIndent" value="4"/>
+			<property name="lineWrappingIndentation" value="4"/>
+			<property name="arrayInitIndent" value="2"/>
+		</module>
+		<module name="AbbreviationAsWordInName">
+			<property name="ignoreFinal" value="false"/>
+			<property name="allowedAbbreviationLength" value="1"/>
+		</module>
+		<module name="OverloadMethodsDeclarationOrder"/>
+		<module name="VariableDeclarationUsageDistance"/>
+		<module name="CustomImportOrder">
+			<property name="sortImportsInGroupAlphabetically" value="true"/>
+			<property name="separateLineBetweenGroups" value="true"/>
+			<property name="customImportOrderRules" value="STATIC###THIRD_PARTY_PACKAGE"/>
+		</module>
+		<module name="MethodParamPad"/>
+		<module name="NoWhitespaceBefore">
+			<property name="tokens"
+					value="COMMA, SEMI, POST_INC, POST_DEC, DOT, ELLIPSIS, METHOD_REF"/>
+			<property name="allowLineBreaks" value="true"/>
+		</module>
+		<module name="ParenPad"/>
+		<module name="OperatorWrap">
+			<property name="option" value="NL"/>
+			<property name="tokens"
+					value="BAND, BOR, BSR, BXOR, DIV, EQUAL, GE, GT, LAND, LE, LITERAL_INSTANCEOF, LOR,
+						LT, MINUS, MOD, NOT_EQUAL, PLUS, QUESTION, SL, SR, STAR, METHOD_REF "/>
+		</module>
+		<module name="AnnotationLocation">
+			<property name="id" value="AnnotationLocationMostCases"/>
+			<property name="tokens"
+					value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF"/>
+		</module>
+		<module name="AnnotationLocation">
+			<property name="id" value="AnnotationLocationVariables"/>
+			<property name="tokens" value="VARIABLE_DEF"/>
+			<property name="allowSamelineMultipleAnnotations" value="true"/>
+		</module>
+		<module name="NonEmptyAtclauseDescription"/>
+		<module name="JavadocTagContinuationIndentation"/>
+		<module name="SummaryJavadoc">
+			<property name="forbiddenSummaryFragments"
+					value="^@return the *|^This method returns |^A [{]@code [a-zA-Z0-9]+[}]( is a )"/>
+		</module>
+		<module name="JavadocParagraph"/>
+		<module name="AtclauseOrder">
+			<property name="tagOrder" value="@param, @return, @throws, @deprecated"/>
+			<property name="target"
+					value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF, VARIABLE_DEF"/>
+		</module>
+		<module name="JavadocMethod">
+			<property name="scope" value="public"/>
+			<property name="allowMissingParamTags" value="true"/>
+			<property name="allowMissingThrowsTags" value="true"/>
+			<property name="allowMissingReturnTag" value="true"/>
+			<property name="allowedAnnotations" value="Override, Test"/>
+			<property name="allowThrowsTagsForSubclasses" value="true"/>
+		</module>
+		<module name="MissingJavadocMethod">
+			<property name="scope" value="public"/>
+			<property name="minLineCount" value="2"/>
+			<property name="allowedAnnotations" value="Override, Test"/>
+		</module>
+		<module name="MethodName">
+			<property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/>
+			<message key="name.invalidPattern"
+					value="Method name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="SingleLineJavadoc">
+			<property name="ignoreInlineTags" value="false"/>
+		</module>
+		<module name="EmptyCatchBlock">
+			<property name="exceptionVariableName" value="expected"/>
+		</module>
+		<module name="CommentsIndentation"/>
+	</module>
+</module>
diff --git a/pom.xml b/pom.xml
index a070a81ca..957f03bda 100644
--- a/pom.xml
+++ b/pom.xml
@@ -507,8 +507,16 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-checkstyle-plugin</artifactId>
 				<version>3.0.0</version>
+				<dependencies>
+					<dependency>
+						<groupId>com.puppycrawl.tools</groupId>
+						<artifactId>checkstyle</artifactId>
+						<version>8.14</version>
+					</dependency>
+					</dependencies>
 				<configuration>
-					<configLocation>ARSnova-checkstyle-checker.xml</configLocation>
+					<configLocation>checkstyle.xml</configLocation>
+					<violationSeverity>warning</violationSeverity>
 				</configuration>
 			</plugin>
 			<plugin>
-- 
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