From 1f04187f2707c461aa7c79dbf047284f6c3bcf9e Mon Sep 17 00:00:00 2001
From: yuanbingze <yuanbingze@yy.com>
Date: Thu, 7 Apr 2022 11:19:12 +0800
Subject: [PATCH 1/6] add checkstyle plugin

---
 pom.xml                            |  37 ++++
 style/checkstyle.xml               | 279 +++++++++++++++++++++++++++++
 style/intellij-java-code-style.xml |  99 ++++++++++
 3 files changed, 415 insertions(+)
 create mode 100644 style/checkstyle.xml
 create mode 100644 style/intellij-java-code-style.xml

diff --git a/pom.xml b/pom.xml
index b1912227ef..7a25667311 100644
--- a/pom.xml
+++ b/pom.xml
@@ -106,6 +106,7 @@
         <metrics.version>3.1.0</metrics.version>
         <javassist.version>3.21.0-GA</javassist.version>
         <shell-executable>bash</shell-executable>
+        <checkstyle.version>3.1.2</checkstyle.version>
     </properties>
     <modules>
         <module>hugegraph-core</module>
@@ -344,6 +345,42 @@
                 </plugin>
             </plugins>
         </pluginManagement>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>${checkstyle.version}</version>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.puppycrawl.tools</groupId>
+                        <artifactId>checkstyle</artifactId>
+                        <version>8.45</version>
+                    </dependency>
+                </dependencies>
+                <configuration>
+                    <consoleOutput>true</consoleOutput>
+                    <encoding>UTF-8</encoding>
+                    <configLocation>style/checkstyle.xml</configLocation>
+                    <failOnViolation>true</failOnViolation>
+                    <violationSeverity>warning</violationSeverity>
+                    <includeTestSourceDirectory>true</includeTestSourceDirectory>
+                    <sourceDirectories>
+                        <sourceDirectory>${project.build.sourceDirectory}</sourceDirectory>
+                    </sourceDirectories>
+                    <excludes>**\/generated-sources\/</excludes>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+
     </build>
 
     <profiles>
diff --git a/style/checkstyle.xml b/style/checkstyle.xml
new file mode 100644
index 0000000000..16b86d3966
--- /dev/null
+++ b/style/checkstyle.xml
@@ -0,0 +1,279 @@
+<?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://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
+
+<module name="Checker">
+    <property name="charset" value="UTF-8"/>
+
+    <property name="severity" value="info"/>
+
+    <property name="fileExtensions" value="java, properties, xml"/>
+
+    <module name="FileTabCharacter">
+        <property name="eachLine" value="true"/>
+    </module>
+
+    <module name="LineLength">
+        <property name="max" value="200"/>
+        <property name="ignorePattern" value="^ *\* *[^ ]+$"/>
+    </module>
+
+    <module name="TreeWalker">
+        <module name="OuterTypeFilename">
+            <property name="severity" value="error"/>
+        </module>
+
+        <module name="OneTopLevelClass">
+            <property name="severity" value="error"/>
+        </module>
+
+        <module name="NoLineWrap">
+            <property name="severity" value="error"/>
+        </module>
+
+        <module name="NeedBraces">
+            <property name="severity" value="error"/>
+        </module>
+
+        <module name="LeftCurly">
+            <property name="severity" value="error"/>
+        </module>
+
+        <module name="AvoidNestedBlocks">
+            <property name="allowInSwitchCase" value="true"/>
+        </module>
+
+        <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="EmptyBlock">
+            <property name="option" value="TEXT"/>
+            <property name="tokens" value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
+        </module>
+
+        <module name="WhitespaceAround">
+            <property name="allowEmptyConstructors" 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="allowMultipleEmptyLines" value="false"/>
+            <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
+            <property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT, CLASS_DEF,
+                                            INTERFACE_DEF, ENUM_DEF, STATIC_INIT, INSTANCE_INIT, METHOD_DEF,
+                                            CTOR_DEF"/>
+        </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-zA-Z0-9]*$"/>
+            <message key="name.invalidPattern"
+                     value="Member name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+        <module name="ParameterName">
+            <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+        <module name="CatchParameterName">
+            <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+        <module name="LocalVariableName">
+            <property name="tokens" value="VARIABLE_DEF"/>
+            <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
+            <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="4"/>
+            <property name="braceAdjustment" value="0"/>
+            <property name="caseIndent" value="4"/>
+            <property name="throwsIndent" value="2"/>
+            <property name="lineWrappingIndentation" value="4"/>
+            <property name="arrayInitIndent" value="4"/>
+        </module>
+
+        <module name="IllegalImport">
+            <property name="regexp" value="true"/>
+            <property name="illegalPkgs"
+                      value="^com\.google\.api\.client\.repackaged,
+                      ^avro\.shaded, ^org\.apache\.hadoop\.hbase\.shaded,
+                      ^org\.apache\.hadoop\.shaded,
+                      ^javax\.ws\.rs\.ext,
+                      ^cc\.concurrent\.mango\.util\.concurrent,
+                      ^org\.apache\.curator-test\.shaded,
+                      ^com\.sun\.istack,
+                      ^org\.jetbrains\.annotations,
+                      ^jline\.internal,
+                      ^com\.cronutils\.utils,
+                      ^javax\.ws\.rs\.ext,
+                      ^org\.jboss\.netty\.util\.internal,
+                      ^com\.sun\.javafx,
+                      ^io\.reactivex\.annotations,
+                      ^org\.codehaus\.jackson"/>
+            <property name="illegalClasses"
+                      value="^java\.util\.logging\.Logging,
+                      ^sun\.misc\.BASE64Encoder,
+                      ^sun\.misc\.BASE64Decoder,
+                      ^jdk\.internal\.jline\.internal\.Nullable"/>
+        </module>
+
+        <module name="RedundantImport"/>
+
+        <module name="UnusedImports"/>
+
+        <module name="ImportOrder">
+            <property name="staticGroups" value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
+            <property name="separatedStaticGroups" value="true"/>
+
+            <property name="groups" value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
+            <property name="ordered" value="true"/>
+            <property name="separated" value="true"/>
+            <property name="option" value="top"/>
+            <property name="sortStaticImportsAlphabetically" value="true"/>
+        </module>
+
+        <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="allowSamelineMultipleAnnotations" value="false"/>
+            <property name="allowSamelineSingleParameterlessAnnotation"
+                      value="false"/>
+            <property name="allowSamelineParameterizedAnnotation" value="true"/>
+            <property name="tokens" value="METHOD_DEF, CTOR_DEF"/>
+        </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="EmptyCatchBlock">
+            <property name="exceptionVariableName" value="expected"/>
+        </module>
+
+        <module name="CommentsIndentation"/>
+
+        <module name="EmptyStatement">
+            <property name="severity" value="error"/>
+        </module>
+
+        <module name="JavadocStyle">
+            <property name="endOfSentenceFormat" value=""/>
+        </module>
+
+        <module name="JavadocType">
+            <property name="scope" value="protected"/>
+            <property name="allowMissingParamTags" value="true"/>
+        </module>
+
+        <module name="AvoidStarImport"/>
+
+    </module>
+</module>
diff --git a/style/intellij-java-code-style.xml b/style/intellij-java-code-style.xml
new file mode 100644
index 0000000000..98d25db6f7
--- /dev/null
+++ b/style/intellij-java-code-style.xml
@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  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.
+-->
+
+<code_scheme name="CodeStyle">
+  <option name="OTHER_INDENT_OPTIONS">
+    <value>
+      <option name="INDENT_SIZE" value="2" />
+      <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      <option name="TAB_SIZE" value="2" />
+      <option name="USE_TAB_CHARACTER" value="false" />
+      <option name="SMART_TABS" value="false" />
+      <option name="LABEL_INDENT_SIZE" value="0" />
+      <option name="LABEL_INDENT_ABSOLUTE" value="false" />
+      <option name="USE_RELATIVE_INDENTS" value="false" />
+    </value>
+  </option>
+  <option name="INSERT_INNER_CLASS_IMPORTS" value="true" />
+  <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
+  <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
+  <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
+    <value />
+  </option>
+  <option name="IMPORT_LAYOUT_TABLE">
+    <value>
+      <package name="com.baidu.hugegraph" withSubpackages="true" static="true" />
+      <emptyLine />
+      <package name="org.apache" withSubpackages="true" static="true" />
+      <emptyLine />
+      <package name="java" withSubpackages="true" static="true" />
+      <emptyLine />
+      <package name="javax" withSubpackages="true" static="true" />
+      <emptyLine />
+      <package name="org" withSubpackages="true" static="true" />
+      <emptyLine />
+      <package name="com" withSubpackages="true" static="true" />
+      <emptyLine />
+      <package name="" withSubpackages="true" static="true" />
+      <emptyLine />
+      <package name="com.baidu.hugegraph" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="org.apache" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="java" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="javax" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="org" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="com" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="" withSubpackages="true" static="false" />
+    </value>
+  </option>
+  <JavaCodeStyleSettings>
+    <option name="SPACE_AFTER_CLOSING_ANGLE_BRACKET_IN_TYPE_ARGUMENT" value="true" />
+    <option name="INSERT_INNER_CLASS_IMPORTS" value="true" />
+    <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
+    <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
+    <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
+      <value />
+    </option>
+    <option name="IMPORT_LAYOUT_TABLE">
+      <value>
+        <package name="" withSubpackages="true" static="true" />
+        <emptyLine />
+        <package name="java" withSubpackages="true" static="false" />
+        <emptyLine />
+        <package name="javax" withSubpackages="true" static="false" />
+        <emptyLine />
+        <package name="org" withSubpackages="true" static="false" />
+        <emptyLine />
+        <package name="com" withSubpackages="true" static="false" />
+        <emptyLine />
+        <package name="" withSubpackages="true" static="false" />
+      </value>
+    </option>
+    <option name="JD_ALIGN_PARAM_COMMENTS" value="false" />
+    <option name="JD_ALIGN_EXCEPTION_COMMENTS" value="false" />
+    <option name="JD_KEEP_EMPTY_PARAMETER" value="false" />
+    <option name="JD_KEEP_EMPTY_EXCEPTION" value="false" />
+    <option name="JD_KEEP_EMPTY_RETURN" value="false" />
+  </JavaCodeStyleSettings>
+  <codeStyleSettings language="JAVA">
+    <option name="BINARY_OPERATION_SIGN_ON_NEXT_LINE" value="true" />
+  </codeStyleSettings>
+</code_scheme>
\ No newline at end of file

From d06d7e6502564c6e925e05226ff494790b360818 Mon Sep 17 00:00:00 2001
From: yuanbingze <seagle.yuan@gmail.com>
Date: Thu, 7 Apr 2022 11:54:49 +0800
Subject: [PATCH 2/6] trigger CLA check


From 1d603b3d6fb4ada785170524c027974c7cd6236e Mon Sep 17 00:00:00 2001
From: yuanbingze <seagle.yuan@gmail.com>
Date: Thu, 7 Apr 2022 14:06:00 +0800
Subject: [PATCH 3/6] merge checkstyle and intellij-java-code-style

---
 pom.xml                            |  26 +--
 style/checkstyle.xml               | 322 ++++++-----------------------
 style/intellij-java-code-style.xml | 124 ++++-------
 3 files changed, 118 insertions(+), 354 deletions(-)

diff --git a/pom.xml b/pom.xml
index 7a25667311..9d83438c4e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -106,7 +106,7 @@
         <metrics.version>3.1.0</metrics.version>
         <javassist.version>3.21.0-GA</javassist.version>
         <shell-executable>bash</shell-executable>
-        <checkstyle.version>3.1.2</checkstyle.version>
+        <checkstyle.version>3.1.0</checkstyle.version>
     </properties>
     <modules>
         <module>hugegraph-core</module>
@@ -351,28 +351,18 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
                 <version>${checkstyle.version}</version>
-                <dependencies>
-                    <dependency>
-                        <groupId>com.puppycrawl.tools</groupId>
-                        <artifactId>checkstyle</artifactId>
-                        <version>8.45</version>
-                    </dependency>
-                </dependencies>
                 <configuration>
-                    <consoleOutput>true</consoleOutput>
-                    <encoding>UTF-8</encoding>
                     <configLocation>style/checkstyle.xml</configLocation>
-                    <failOnViolation>true</failOnViolation>
-                    <violationSeverity>warning</violationSeverity>
-                    <includeTestSourceDirectory>true</includeTestSourceDirectory>
-                    <sourceDirectories>
-                        <sourceDirectory>${project.build.sourceDirectory}</sourceDirectory>
-                    </sourceDirectories>
-                    <excludes>**\/generated-sources\/</excludes>
+                    <encoding>UTF-8</encoding>
+                    <consoleOutput>true</consoleOutput>
+                    <failsOnError>true</failsOnError>
+                    <linkXRef>false</linkXRef>
+                    <includeTestSourceDirectory>false</includeTestSourceDirectory>
                 </configuration>
                 <executions>
                     <execution>
-                        <phase>compile</phase>
+                        <id>validate</id>
+                        <phase>validate</phase>
                         <goals>
                             <goal>check</goal>
                         </goals>
diff --git a/style/checkstyle.xml b/style/checkstyle.xml
index 16b86d3966..9373a70d91 100644
--- a/style/checkstyle.xml
+++ b/style/checkstyle.xml
@@ -1,279 +1,89 @@
-<?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.
--->
-
+<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE module PUBLIC
-        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-        "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
-
+        "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+        "https://checkstyle.org/dtds/configuration_1_3.dtd">
+<!-- 参考：https://checkstyle.sourceforge.io/checks.html -->
 <module name="Checker">
+    <!--检查不通过时被判定的违规级别，必须修复后才能使build通过-->
+    <property name="severity" value="error"/>
+    <!--对java文件做检查-->
+    <property name="fileExtensions" value="java"/>
+    <!--对UTF-8编码的文件做检查-->
     <property name="charset" value="UTF-8"/>
-
-    <property name="severity" value="info"/>
-
-    <property name="fileExtensions" value="java, properties, xml"/>
-
+    <!--文件中不允许包含制表符-->
     <module name="FileTabCharacter">
         <property name="eachLine" value="true"/>
     </module>
 
-    <module name="LineLength">
-        <property name="max" value="200"/>
-        <property name="ignorePattern" value="^ *\* *[^ ]+$"/>
-    </module>
-
+    <!--检查java源文件并定义一些适用于检查此类文件的一些属性-->
     <module name="TreeWalker">
-        <module name="OuterTypeFilename">
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="OneTopLevelClass">
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="NoLineWrap">
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="NeedBraces">
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="LeftCurly">
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="AvoidNestedBlocks">
-            <property name="allowInSwitchCase" value="true"/>
-        </module>
-
-        <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="EmptyBlock">
-            <property name="option" value="TEXT"/>
-            <property name="tokens" value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
-        </module>
-
-        <module name="WhitespaceAround">
-            <property name="allowEmptyConstructors" 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="allowMultipleEmptyLines" value="false"/>
-            <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
-            <property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT, CLASS_DEF,
-                                            INTERFACE_DEF, ENUM_DEF, STATIC_INIT, INSTANCE_INIT, METHOD_DEF,
-                                            CTOR_DEF"/>
-        </module>
-
+        <!--检查行长度-->
+        <module name="LineLength">
+            <property name="max" value="80"/>
+            <!--可以忽略的行-->
+            <property name="ignorePattern"
+                      value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
+        </module>
+        <!--检查没有import语句使用*号-->
+        <module name="AvoidStarImport"/>
+        <!--检查是否存在多余的import语句，比如重复的，java自带的包，相同包下的其他类-->
+        <module name="RedundantImport"/>
+        <!--检查是否存在没有使用的import语句-->
+        <module name="UnusedImports"/>
+        <!--检查包名称是否遵守命名规约-->
         <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}''."/>
+        <!--检查局部变量的名称是否遵守命名规约-->
+        <module name="LocalVariableName">
+            <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
         </module>
-
+        <!--检查成员变量（非静态字段）的名称是否遵守命名规约-->
         <module name="MemberName">
             <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
-            <message key="name.invalidPattern"
-                     value="Member name ''{0}'' must match pattern ''{1}''."/>
-        </module>
-
-        <module name="ParameterName">
-            <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
-            <message key="name.invalidPattern"
-                     value="Parameter name ''{0}'' must match pattern ''{1}''."/>
-        </module>
-
-        <module name="CatchParameterName">
-            <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
-            <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-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="4"/>
-            <property name="braceAdjustment" value="0"/>
-            <property name="caseIndent" value="4"/>
-            <property name="throwsIndent" value="2"/>
-            <property name="lineWrappingIndentation" value="4"/>
-            <property name="arrayInitIndent" value="4"/>
-        </module>
-
-        <module name="IllegalImport">
-            <property name="regexp" value="true"/>
-            <property name="illegalPkgs"
-                      value="^com\.google\.api\.client\.repackaged,
-                      ^avro\.shaded, ^org\.apache\.hadoop\.hbase\.shaded,
-                      ^org\.apache\.hadoop\.shaded,
-                      ^javax\.ws\.rs\.ext,
-                      ^cc\.concurrent\.mango\.util\.concurrent,
-                      ^org\.apache\.curator-test\.shaded,
-                      ^com\.sun\.istack,
-                      ^org\.jetbrains\.annotations,
-                      ^jline\.internal,
-                      ^com\.cronutils\.utils,
-                      ^javax\.ws\.rs\.ext,
-                      ^org\.jboss\.netty\.util\.internal,
-                      ^com\.sun\.javafx,
-                      ^io\.reactivex\.annotations,
-                      ^org\.codehaus\.jackson"/>
-            <property name="illegalClasses"
-                      value="^java\.util\.logging\.Logging,
-                      ^sun\.misc\.BASE64Encoder,
-                      ^sun\.misc\.BASE64Decoder,
-                      ^jdk\.internal\.jline\.internal\.Nullable"/>
-        </module>
-
-        <module name="RedundantImport"/>
-
-        <module name="UnusedImports"/>
-
-        <module name="ImportOrder">
-            <property name="staticGroups" value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
-            <property name="separatedStaticGroups" value="true"/>
-
-            <property name="groups" value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
-            <property name="ordered" value="true"/>
-            <property name="separated" value="true"/>
-            <property name="option" value="top"/>
-            <property name="sortStaticImportsAlphabetically" value="true"/>
-        </module>
-
-        <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="allowSamelineMultipleAnnotations" value="false"/>
-            <property name="allowSamelineSingleParameterlessAnnotation"
-                      value="false"/>
-            <property name="allowSamelineParameterizedAnnotation" value="true"/>
-            <property name="tokens" value="METHOD_DEF, CTOR_DEF"/>
-        </module>
-
+        <!--检查方法名称是否遵守命名规约-->
         <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}''."/>
+            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
         </module>
-
-        <module name="EmptyCatchBlock">
-            <property name="exceptionVariableName" value="expected"/>
+        <!--检查参数名称是否遵守命名规约-->
+        <module name="ParameterName">
+            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
         </module>
-
-        <module name="CommentsIndentation"/>
-
-        <module name="EmptyStatement">
-            <property name="severity" value="error"/>
+        <!--检查常量（用static final修饰的字段）的名称是否遵守命名规约-->
+        <module name="ConstantName">
+            <property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
         </module>
-
-        <module name="JavadocStyle">
-            <property name="endOfSentenceFormat" value=""/>
+        <!--检查数组是否属于java风格，方括号放在类型后面，而不是变量后面，比如：int[] nums（合法），int nums[]（不合法）-->
+        <module name="ArrayTypeStyle">
+            <property name="javaStyle" value="true"/>
         </module>
-
-        <module name="JavadocType">
-            <property name="scope" value="protected"/>
-            <property name="allowMissingParamTags" value="true"/>
+        <!--long类型的字面量如果要以"L"结尾，必须是大写的"L"，而非小写的"l"-->
+        <module name="UpperEll"/>
+        <!--代码换行时，运算符必须在当前行的末尾，比如：+、&&、?、: 等-->
+        <module name="OperatorWrap">
+            <property name="option" value="eol"/>
         </module>
-
-        <module name="AvoidStarImport"/>
-
+        <!--检查指定标记的周围是否有空格，比如：if、for、while、synchoronized 等-->
+        <module name="WhitespaceAround"/>
+        <!--左圆括号之后和右圆括号之前是否需要有一个空格，不需要-->
+        <module name="ParenPad"/>
+        <!--检查修饰符是否符合Java建议，顺序是：public、protected、private、abstract、default、static、final、transient、volatile、synchronized、native、strictfp-->
+        <module name="ModifierOrder"/>
+        <!--检查代码块的左花括号的放置位置，必须在当前行的末尾-->
+        <module name="LeftCurly">
+            <property name="option" value="eol"/>
+            <property name="ignoreEnums" value="false"/>
+        </module>
+        <!--代码中不允许有空语句，也就是单独的;符号-->
+        <module name="EmptyStatement"/>
+        <!--覆盖equals()方法的类必须也覆盖了hashCode()方法-->
+        <module name="EqualsHashCode"/>
+        <!--switch语句必须含有default子句-->
+        <module name="MissingSwitchDefault"/>
+        <!--switch语句的default必须放在所有的case分支之后-->
+        <module name="DefaultComesLast"/>
+        <!--覆盖clone()方法时调用了super.clone()方法-->
+        <module name="SuperClone"/>
     </module>
 </module>
diff --git a/style/intellij-java-code-style.xml b/style/intellij-java-code-style.xml
index 98d25db6f7..4bb2ef4ca4 100644
--- a/style/intellij-java-code-style.xml
+++ b/style/intellij-java-code-style.xml
@@ -1,77 +1,13 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  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.
--->
-
-<code_scheme name="CodeStyle">
-  <option name="OTHER_INDENT_OPTIONS">
-    <value>
-      <option name="INDENT_SIZE" value="2" />
-      <option name="CONTINUATION_INDENT_SIZE" value="4" />
-      <option name="TAB_SIZE" value="2" />
-      <option name="USE_TAB_CHARACTER" value="false" />
-      <option name="SMART_TABS" value="false" />
-      <option name="LABEL_INDENT_SIZE" value="0" />
-      <option name="LABEL_INDENT_ABSOLUTE" value="false" />
-      <option name="USE_RELATIVE_INDENTS" value="false" />
-    </value>
-  </option>
-  <option name="INSERT_INNER_CLASS_IMPORTS" value="true" />
-  <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
-  <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
-  <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
-    <value />
-  </option>
-  <option name="IMPORT_LAYOUT_TABLE">
-    <value>
-      <package name="com.baidu.hugegraph" withSubpackages="true" static="true" />
-      <emptyLine />
-      <package name="org.apache" withSubpackages="true" static="true" />
-      <emptyLine />
-      <package name="java" withSubpackages="true" static="true" />
-      <emptyLine />
-      <package name="javax" withSubpackages="true" static="true" />
-      <emptyLine />
-      <package name="org" withSubpackages="true" static="true" />
-      <emptyLine />
-      <package name="com" withSubpackages="true" static="true" />
-      <emptyLine />
-      <package name="" withSubpackages="true" static="true" />
-      <emptyLine />
-      <package name="com.baidu.hugegraph" withSubpackages="true" static="false" />
-      <emptyLine />
-      <package name="org.apache" withSubpackages="true" static="false" />
-      <emptyLine />
-      <package name="java" withSubpackages="true" static="false" />
-      <emptyLine />
-      <package name="javax" withSubpackages="true" static="false" />
-      <emptyLine />
-      <package name="org" withSubpackages="true" static="false" />
-      <emptyLine />
-      <package name="com" withSubpackages="true" static="false" />
-      <emptyLine />
-      <package name="" withSubpackages="true" static="false" />
-    </value>
-  </option>
+<code_scheme name="hugegraph-style" version="173">
+  <option name="LINE_SEPARATOR" value="&#xA;" />
+  <option name="RIGHT_MARGIN" value="80" />
+  <option name="WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN" value="true" />
+  <option name="SOFT_MARGINS" value="80" />
   <JavaCodeStyleSettings>
-    <option name="SPACE_AFTER_CLOSING_ANGLE_BRACKET_IN_TYPE_ARGUMENT" value="true" />
-    <option name="INSERT_INNER_CLASS_IMPORTS" value="true" />
-    <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
-    <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
-    <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
-      <value />
-    </option>
+    <option name="ANNOTATION_PARAMETER_WRAP" value="1" />
+    <option name="ALIGN_MULTILINE_ANNOTATION_PARAMETERS" value="true" />
+    <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="100" />
+    <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="100" />
     <option name="IMPORT_LAYOUT_TABLE">
       <value>
         <package name="" withSubpackages="true" static="true" />
@@ -87,13 +23,41 @@
         <package name="" withSubpackages="true" static="false" />
       </value>
     </option>
-    <option name="JD_ALIGN_PARAM_COMMENTS" value="false" />
-    <option name="JD_ALIGN_EXCEPTION_COMMENTS" value="false" />
-    <option name="JD_KEEP_EMPTY_PARAMETER" value="false" />
-    <option name="JD_KEEP_EMPTY_EXCEPTION" value="false" />
-    <option name="JD_KEEP_EMPTY_RETURN" value="false" />
   </JavaCodeStyleSettings>
+  <XML>
+    <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
+  </XML>
   <codeStyleSettings language="JAVA">
-    <option name="BINARY_OPERATION_SIGN_ON_NEXT_LINE" value="true" />
+    <option name="LINE_COMMENT_AT_FIRST_COLUMN" value="false" />
+    <option name="ALIGN_MULTILINE_CHAINED_METHODS" value="true" />
+    <option name="ALIGN_MULTILINE_PARAMETERS_IN_CALLS" value="true" />
+    <option name="ALIGN_MULTILINE_BINARY_OPERATION" value="true" />
+    <option name="ALIGN_MULTILINE_ASSIGNMENT" value="true" />
+    <option name="ALIGN_MULTILINE_TERNARY_OPERATION" value="true" />
+    <option name="ALIGN_MULTILINE_THROWS_LIST" value="true" />
+    <option name="ALIGN_MULTILINE_EXTENDS_LIST" value="true" />
+    <option name="ALIGN_MULTILINE_ARRAY_INITIALIZER_EXPRESSION" value="true" />
+    <option name="CALL_PARAMETERS_WRAP" value="1" />
+    <option name="METHOD_PARAMETERS_WRAP" value="1" />
+    <option name="RESOURCE_LIST_WRAP" value="1" />
+    <option name="EXTENDS_LIST_WRAP" value="1" />
+    <option name="THROWS_LIST_WRAP" value="1" />
+    <option name="METHOD_CALL_CHAIN_WRAP" value="1" />
+    <option name="BINARY_OPERATION_WRAP" value="1" />
+    <option name="TERNARY_OPERATION_WRAP" value="1" />
+    <option name="FOR_STATEMENT_WRAP" value="1" />
+    <option name="ARRAY_INITIALIZER_WRAP" value="1" />
+    <option name="ASSIGNMENT_WRAP" value="1" />
+    <option name="ASSERT_STATEMENT_WRAP" value="1" />
+    <option name="IF_BRACE_FORCE" value="1" />
+    <option name="DOWHILE_BRACE_FORCE" value="3" />
+    <option name="WHILE_BRACE_FORCE" value="1" />
+    <option name="FOR_BRACE_FORCE" value="1" />
+    <option name="WRAP_LONG_LINES" value="true" />
+    <option name="PARAMETER_ANNOTATION_WRAP" value="1" />
+    <option name="ENUM_CONSTANTS_WRAP" value="2" />
+    <indentOptions>
+      <option name="SMART_TABS" value="true" />
+    </indentOptions>
   </codeStyleSettings>
-</code_scheme>
\ No newline at end of file
+</code_scheme>

From f096b98a85ebcf64cc83fac3505e04e69ea9a0b2 Mon Sep 17 00:00:00 2001
From: yuanbingze <seagle.yuan@gmail.com>
Date: Thu, 14 Apr 2022 20:54:51 +0800
Subject: [PATCH 4/6] update checkstyle.xml

---
 pom.xml                            |   2 +-
 style/checkstyle.xml               | 281 +++++++++++++++++++++++------
 style/intellij-java-code-style.xml |  63 -------
 3 files changed, 227 insertions(+), 119 deletions(-)
 delete mode 100644 style/intellij-java-code-style.xml

diff --git a/pom.xml b/pom.xml
index 9d83438c4e..b66f7988e3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -106,7 +106,7 @@
         <metrics.version>3.1.0</metrics.version>
         <javassist.version>3.21.0-GA</javassist.version>
         <shell-executable>bash</shell-executable>
-        <checkstyle.version>3.1.0</checkstyle.version>
+        <checkstyle.version>3.1.2</checkstyle.version>
     </properties>
     <modules>
         <module>hugegraph-core</module>
diff --git a/style/checkstyle.xml b/style/checkstyle.xml
index 9373a70d91..9ae6f59472 100644
--- a/style/checkstyle.xml
+++ b/style/checkstyle.xml
@@ -2,88 +2,259 @@
 <!DOCTYPE module PUBLIC
         "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
         "https://checkstyle.org/dtds/configuration_1_3.dtd">
-<!-- 参考：https://checkstyle.sourceforge.io/checks.html -->
 <module name="Checker">
-    <!--检查不通过时被判定的违规级别，必须修复后才能使build通过-->
-    <property name="severity" value="error"/>
-    <!--对java文件做检查-->
-    <property name="fileExtensions" value="java"/>
-    <!--对UTF-8编码的文件做检查-->
     <property name="charset" value="UTF-8"/>
-    <!--文件中不允许包含制表符-->
+    <property name="severity" value="info"/>
+    <property name="fileExtensions" value="java, properties, xml"/>
+
     <module name="FileTabCharacter">
         <property name="eachLine" value="true"/>
     </module>
 
-    <!--检查java源文件并定义一些适用于检查此类文件的一些属性-->
+    <module name="LineLength">
+        <property name="max" value="100"/>
+        <property name="ignorePattern" value="^ *\* *[^ ]+$"/>
+    </module>
+
+    <module name="RegexpSingleline">
+        <property name="format" value="System\.out\.println"/>
+        <property name="message" value="Prohibit invoking System.out.println in source code !"/>
+    </module>
+
     <module name="TreeWalker">
-        <!--检查行长度-->
-        <module name="LineLength">
-            <property name="max" value="80"/>
-            <!--可以忽略的行-->
-            <property name="ignorePattern"
-                      value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
-        </module>
-        <!--检查没有import语句使用*号-->
+
+        <module name="PackageName">
+            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
+            <message key="name.invalidPattern"  value="Package name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+        <module name="ImportOrder">
+            <property name="staticGroups"
+                      value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
+            <property name="separatedStaticGroups" value="true"/>
+            <property name="groups" value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
+            <property name="ordered" value="true"/>
+            <property name="separated" value="true"/>
+            <property name="option" value="top"/>
+            <property name="sortStaticImportsAlphabetically" value="true"/>
+        </module>
+
         <module name="AvoidStarImport"/>
-        <!--检查是否存在多余的import语句，比如重复的，java自带的包，相同包下的其他类-->
         <module name="RedundantImport"/>
-        <!--检查是否存在没有使用的import语句-->
         <module name="UnusedImports"/>
-        <!--检查包名称是否遵守命名规约-->
-        <module name="PackageName">
-            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
+        <module name="EmptyLineSeparator">
+            <property name="allowMultipleEmptyLines" value="false"/>
+            <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
+            <property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT, CLASS_DEF,INTERFACE_DEF, ENUM_DEF, STATIC_INIT, INSTANCE_INIT, METHOD_DEF,CTOR_DEF"/>
+        </module>
+
+        <module name="ModifierOrder"/>
+
+        <module name="TypeName">
+            <message key="name.invalidPattern" value="Type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+        <module name="ClassTypeParameterName">
+            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+            <message key="name.invalidPattern" value="Class type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+        <module name="ConstantName">
+            <property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
         </module>
-        <!--检查局部变量的名称是否遵守命名规约-->
+
         <module name="LocalVariableName">
-            <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
+            <property name="tokens" value="VARIABLE_DEF"/>
+            <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern" value="Local variable name ''{0}'' must match pattern ''{1}''."/>
         </module>
-        <!--检查成员变量（非静态字段）的名称是否遵守命名规约-->
+
         <module name="MemberName">
             <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+            <message key="name.invalidPattern"
+                     value="Member name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+        <module name="ParameterName">
+            <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+        <module name="CatchParameterName">
+            <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+
+
+
+        <module name="ArrayTypeStyle"/>
+        <module name="MethodTypeParameterName">
+            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+            <message key="name.invalidPattern"
+                     value="Method type name ''{0}'' must match pattern ''{1}''."/>
         </module>
-        <!--检查方法名称是否遵守命名规约-->
+
         <module name="MethodName">
-            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/>
+            <message key="name.invalidPattern"
+                     value="Method name ''{0}'' must match pattern ''{1}''."/>
         </module>
-        <!--检查参数名称是否遵守命名规约-->
-        <module name="ParameterName">
-            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+        <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>
-        <!--检查常量（用static final修饰的字段）的名称是否遵守命名规约-->
-        <module name="ConstantName">
-            <property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
+
+        <module name="EqualsHashCode"/>
+        <module name="MissingSwitchDefault"/>
+        <module name="DefaultComesLast"/>
+        <module name="SuperClone"/>
+
+        <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>
-        <!--检查数组是否属于java风格，方括号放在类型后面，而不是变量后面，比如：int[] nums（合法），int nums[]（不合法）-->
-        <module name="ArrayTypeStyle">
-            <property name="javaStyle" value="true"/>
+
+        <module name="Indentation">
+            <property name="basicOffset" value="4"/>
+            <property name="braceAdjustment" value="0"/>
+            <property name="caseIndent" value="4"/>
+            <property name="throwsIndent" value="2"/>
+            <property name="lineWrappingIndentation" value="4"/>
+            <property name="arrayInitIndent" value="4"/>
         </module>
-        <!--long类型的字面量如果要以"L"结尾，必须是大写的"L"，而非小写的"l"-->
+
         <module name="UpperEll"/>
-        <!--代码换行时，运算符必须在当前行的末尾，比如：+、&&、?、: 等-->
+        <module name="IllegalImport">
+            <property name="regexp" value="true"/>
+            <property name="illegalPkgs"
+                      value="^com\.google\.api\.client\.repackaged,
+                      ^avro\.shaded, ^org\.apache\.hadoop\.hbase\.shaded,
+                      ^org\.apache\.hadoop\.shaded,
+                      ^javax\.ws\.rs\.ext,
+                      ^cc\.concurrent\.mango\.util\.concurrent,
+                      ^org\.apache\.curator-test\.shaded,
+                      ^com\.sun\.istack,
+                      ^org\.jetbrains\.annotations,
+                      ^jline\.internal,
+                      ^com\.cronutils\.utils,
+                      ^javax\.ws\.rs\.ext,
+                      ^org\.jboss\.netty\.util\.internal,
+                      ^com\.sun\.javafx,
+                      ^io\.reactivex\.annotations,
+                      ^org\.codehaus\.jackson"/>
+            <property name="illegalClasses"
+                      value="^java\.util\.logging\.Logging,
+                      ^sun\.misc\.BASE64Encoder,
+                      ^sun\.misc\.BASE64Decoder,
+                      ^jdk\.internal\.jline\.internal\.Nullable"/>
+        </module>
+
+        <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="eol"/>
+            <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>
-        <!--检查指定标记的周围是否有空格，比如：if、for、while、synchoronized 等-->
-        <module name="WhitespaceAround"/>
-        <!--左圆括号之后和右圆括号之前是否需要有一个空格，不需要-->
-        <module name="ParenPad"/>
-        <!--检查修饰符是否符合Java建议，顺序是：public、protected、private、abstract、default、static、final、transient、volatile、synchronized、native、strictfp-->
-        <module name="ModifierOrder"/>
-        <!--检查代码块的左花括号的放置位置，必须在当前行的末尾-->
+
+        <module name="AnnotationLocation">
+            <property name="allowSamelineMultipleAnnotations" value="false"/>
+            <property name="allowSamelineSingleParameterlessAnnotation"
+                      value="false"/>
+            <property name="allowSamelineParameterizedAnnotation" value="true"/>
+            <property name="tokens" value="METHOD_DEF, CTOR_DEF"/>
+        </module>
+
+        <module name="EmptyCatchBlock">
+            <property name="exceptionVariableName" value="expected"/>
+        </module>
+
+        <module name="CommentsIndentation"/>
+
+        <module name="NoLineWrap">
+<!--            <property name="severity" value="error"/>-->
+        </module>
+
+        <module name="EmptyStatement">
+<!--            <property name="severity" value="error"/>-->
+        </module>
+
+        <module name="NeedBraces">
+<!--            <property name="severity" value="error"/>-->
+        </module>
+
         <module name="LeftCurly">
-            <property name="option" value="eol"/>
-            <property name="ignoreEnums" value="false"/>
+<!--            <property name="severity" value="error"/>-->
         </module>
-        <!--代码中不允许有空语句，也就是单独的;符号-->
-        <module name="EmptyStatement"/>
-        <!--覆盖equals()方法的类必须也覆盖了hashCode()方法-->
-        <module name="EqualsHashCode"/>
-        <!--switch语句必须含有default子句-->
+
+        <module name="WhitespaceAround">
+            <property name="allowEmptyConstructors" 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="AvoidNestedBlocks">
+            <property name="allowInSwitchCase" value="true"/>
+        </module>
+
+        <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="EmptyBlock">
+            <property name="option" value="TEXT"/>
+            <property name="tokens" value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
+        </module>
+        <module name="OneStatementPerLine"/>
+
+        <module name="MultipleVariableDeclarations"/>
+
         <module name="MissingSwitchDefault"/>
-        <!--switch语句的default必须放在所有的case分支之后-->
-        <module name="DefaultComesLast"/>
-        <!--覆盖clone()方法时调用了super.clone()方法-->
-        <module name="SuperClone"/>
+
+        <module name="FallThrough"/>
+
+        <module name="OuterTypeFilename">
+<!--            <property name="severity" value="error"/>-->
+        </module>
+
+        <module name="OneTopLevelClass">
+<!--            <property name="severity" value="error"/>-->
+        </module>
+
+        <module name="JavadocStyle">
+            <property name="endOfSentenceFormat" value=""/>
+        </module>
+
+        <module name="JavadocType">
+            <property name="scope" value="protected"/>
+            <property name="allowMissingParamTags" value="true"/>
+        </module>
     </module>
 </module>
diff --git a/style/intellij-java-code-style.xml b/style/intellij-java-code-style.xml
deleted file mode 100644
index 4bb2ef4ca4..0000000000
--- a/style/intellij-java-code-style.xml
+++ /dev/null
@@ -1,63 +0,0 @@
-<code_scheme name="hugegraph-style" version="173">
-  <option name="LINE_SEPARATOR" value="&#xA;" />
-  <option name="RIGHT_MARGIN" value="80" />
-  <option name="WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN" value="true" />
-  <option name="SOFT_MARGINS" value="80" />
-  <JavaCodeStyleSettings>
-    <option name="ANNOTATION_PARAMETER_WRAP" value="1" />
-    <option name="ALIGN_MULTILINE_ANNOTATION_PARAMETERS" value="true" />
-    <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="100" />
-    <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="100" />
-    <option name="IMPORT_LAYOUT_TABLE">
-      <value>
-        <package name="" withSubpackages="true" static="true" />
-        <emptyLine />
-        <package name="java" withSubpackages="true" static="false" />
-        <emptyLine />
-        <package name="javax" withSubpackages="true" static="false" />
-        <emptyLine />
-        <package name="org" withSubpackages="true" static="false" />
-        <emptyLine />
-        <package name="com" withSubpackages="true" static="false" />
-        <emptyLine />
-        <package name="" withSubpackages="true" static="false" />
-      </value>
-    </option>
-  </JavaCodeStyleSettings>
-  <XML>
-    <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
-  </XML>
-  <codeStyleSettings language="JAVA">
-    <option name="LINE_COMMENT_AT_FIRST_COLUMN" value="false" />
-    <option name="ALIGN_MULTILINE_CHAINED_METHODS" value="true" />
-    <option name="ALIGN_MULTILINE_PARAMETERS_IN_CALLS" value="true" />
-    <option name="ALIGN_MULTILINE_BINARY_OPERATION" value="true" />
-    <option name="ALIGN_MULTILINE_ASSIGNMENT" value="true" />
-    <option name="ALIGN_MULTILINE_TERNARY_OPERATION" value="true" />
-    <option name="ALIGN_MULTILINE_THROWS_LIST" value="true" />
-    <option name="ALIGN_MULTILINE_EXTENDS_LIST" value="true" />
-    <option name="ALIGN_MULTILINE_ARRAY_INITIALIZER_EXPRESSION" value="true" />
-    <option name="CALL_PARAMETERS_WRAP" value="1" />
-    <option name="METHOD_PARAMETERS_WRAP" value="1" />
-    <option name="RESOURCE_LIST_WRAP" value="1" />
-    <option name="EXTENDS_LIST_WRAP" value="1" />
-    <option name="THROWS_LIST_WRAP" value="1" />
-    <option name="METHOD_CALL_CHAIN_WRAP" value="1" />
-    <option name="BINARY_OPERATION_WRAP" value="1" />
-    <option name="TERNARY_OPERATION_WRAP" value="1" />
-    <option name="FOR_STATEMENT_WRAP" value="1" />
-    <option name="ARRAY_INITIALIZER_WRAP" value="1" />
-    <option name="ASSIGNMENT_WRAP" value="1" />
-    <option name="ASSERT_STATEMENT_WRAP" value="1" />
-    <option name="IF_BRACE_FORCE" value="1" />
-    <option name="DOWHILE_BRACE_FORCE" value="3" />
-    <option name="WHILE_BRACE_FORCE" value="1" />
-    <option name="FOR_BRACE_FORCE" value="1" />
-    <option name="WRAP_LONG_LINES" value="true" />
-    <option name="PARAMETER_ANNOTATION_WRAP" value="1" />
-    <option name="ENUM_CONSTANTS_WRAP" value="2" />
-    <indentOptions>
-      <option name="SMART_TABS" value="true" />
-    </indentOptions>
-  </codeStyleSettings>
-</code_scheme>

From 8d57a41ab6061e980de784a6b13d3f49a40fbb0f Mon Sep 17 00:00:00 2001
From: yuanbingze <seagle.yuan@gmail.com>
Date: Thu, 14 Apr 2022 21:22:01 +0800
Subject: [PATCH 5/6] delete unnecessary blank lines

---
 style/checkstyle.xml | 47 ++------------------------------------------
 1 file changed, 2 insertions(+), 45 deletions(-)

diff --git a/style/checkstyle.xml b/style/checkstyle.xml
index 9ae6f59472..0361082808 100644
--- a/style/checkstyle.xml
+++ b/style/checkstyle.xml
@@ -10,24 +10,20 @@
     <module name="FileTabCharacter">
         <property name="eachLine" value="true"/>
     </module>
-
     <module name="LineLength">
         <property name="max" value="100"/>
         <property name="ignorePattern" value="^ *\* *[^ ]+$"/>
     </module>
-
     <module name="RegexpSingleline">
         <property name="format" value="System\.out\.println"/>
         <property name="message" value="Prohibit invoking System.out.println in source code !"/>
     </module>
 
     <module name="TreeWalker">
-
         <module name="PackageName">
             <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
             <message key="name.invalidPattern"  value="Package name ''{0}'' must match pattern ''{1}''."/>
         </module>
-
         <module name="ImportOrder">
             <property name="staticGroups"
                       value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
@@ -38,7 +34,6 @@
             <property name="option" value="top"/>
             <property name="sortStaticImportsAlphabetically" value="true"/>
         </module>
-
         <module name="AvoidStarImport"/>
         <module name="RedundantImport"/>
         <module name="UnusedImports"/>
@@ -47,55 +42,44 @@
             <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
             <property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT, CLASS_DEF,INTERFACE_DEF, ENUM_DEF, STATIC_INIT, INSTANCE_INIT, METHOD_DEF,CTOR_DEF"/>
         </module>
-
         <module name="ModifierOrder"/>
-
         <module name="TypeName">
             <message key="name.invalidPattern" value="Type name ''{0}'' must match pattern ''{1}''."/>
         </module>
-
         <module name="ClassTypeParameterName">
             <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
             <message key="name.invalidPattern" value="Class type name ''{0}'' must match pattern ''{1}''."/>
         </module>
-
         <module name="ConstantName">
             <property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
         </module>
-
         <module name="LocalVariableName">
             <property name="tokens" value="VARIABLE_DEF"/>
             <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
-            <message key="name.invalidPattern" value="Local variable name ''{0}'' must match pattern ''{1}''."/>
+            <message key="name.invalidPattern"
+                     value="Local variable name ''{0}'' must match pattern ''{1}''."/>
         </module>
-
         <module name="MemberName">
             <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
             <message key="name.invalidPattern"
                      value="Member name ''{0}'' must match pattern ''{1}''."/>
         </module>
-
         <module name="ParameterName">
             <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
             <message key="name.invalidPattern"
                      value="Parameter name ''{0}'' must match pattern ''{1}''."/>
         </module>
-
         <module name="CatchParameterName">
             <property name="format" value="^[a-z]([a-zA-Z0-9]*)?$"/>
             <message key="name.invalidPattern"
                      value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
         </module>
-
-
-
         <module name="ArrayTypeStyle"/>
         <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="MethodName">
             <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/>
             <message key="name.invalidPattern"
@@ -106,14 +90,11 @@
             <message key="name.invalidPattern"
                      value="Interface type name ''{0}'' must match pattern ''{1}''."/>
         </module>
-
         <module name="EqualsHashCode"/>
         <module name="MissingSwitchDefault"/>
         <module name="DefaultComesLast"/>
         <module name="SuperClone"/>
-
         <module name="NoFinalizer"/>
-
         <module name="GenericWhitespace">
             <message key="ws.followed"
                      value="GenericWhitespace ''{0}'' is followed by whitespace."/>
@@ -124,7 +105,6 @@
             <message key="ws.notPreceded"
                      value="GenericWhitespace ''{0}'' is not preceded with whitespace."/>
         </module>
-
         <module name="Indentation">
             <property name="basicOffset" value="4"/>
             <property name="braceAdjustment" value="0"/>
@@ -133,7 +113,6 @@
             <property name="lineWrappingIndentation" value="4"/>
             <property name="arrayInitIndent" value="4"/>
         </module>
-
         <module name="UpperEll"/>
         <module name="IllegalImport">
             <property name="regexp" value="true"/>
@@ -159,20 +138,16 @@
                       ^sun\.misc\.BASE64Decoder,
                       ^jdk\.internal\.jline\.internal\.Nullable"/>
         </module>
-
         <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="eol"/>
             <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="allowSamelineMultipleAnnotations" value="false"/>
             <property name="allowSamelineSingleParameterlessAnnotation"
@@ -180,29 +155,22 @@
             <property name="allowSamelineParameterizedAnnotation" value="true"/>
             <property name="tokens" value="METHOD_DEF, CTOR_DEF"/>
         </module>
-
         <module name="EmptyCatchBlock">
             <property name="exceptionVariableName" value="expected"/>
         </module>
-
         <module name="CommentsIndentation"/>
-
         <module name="NoLineWrap">
 <!--            <property name="severity" value="error"/>-->
         </module>
-
         <module name="EmptyStatement">
 <!--            <property name="severity" value="error"/>-->
         </module>
-
         <module name="NeedBraces">
 <!--            <property name="severity" value="error"/>-->
         </module>
-
         <module name="LeftCurly">
 <!--            <property name="severity" value="error"/>-->
         </module>
-
         <module name="WhitespaceAround">
             <property name="allowEmptyConstructors" value="true"/>
             <property name="allowEmptyMethods" value="true"/>
@@ -211,47 +179,36 @@
             <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="AvoidNestedBlocks">
             <property name="allowInSwitchCase" value="true"/>
         </module>
-
         <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="EmptyBlock">
             <property name="option" value="TEXT"/>
             <property name="tokens" value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
         </module>
         <module name="OneStatementPerLine"/>
-
         <module name="MultipleVariableDeclarations"/>
-
         <module name="MissingSwitchDefault"/>
-
         <module name="FallThrough"/>
-
         <module name="OuterTypeFilename">
 <!--            <property name="severity" value="error"/>-->
         </module>
-
         <module name="OneTopLevelClass">
 <!--            <property name="severity" value="error"/>-->
         </module>
-
         <module name="JavadocStyle">
             <property name="endOfSentenceFormat" value=""/>
         </module>
-
         <module name="JavadocType">
             <property name="scope" value="protected"/>
             <property name="allowMissingParamTags" value="true"/>

From c5d0075936d645852fb9165e073e6dd96d34c6a4 Mon Sep 17 00:00:00 2001
From: yuanbingze <seagle.yuan@gmail.com>
Date: Fri, 15 Apr 2022 11:25:46 +0800
Subject: [PATCH 6/6] commented checkstyle ImportOrder module

---
 style/checkstyle.xml | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/style/checkstyle.xml b/style/checkstyle.xml
index 0361082808..999f5c687a 100644
--- a/style/checkstyle.xml
+++ b/style/checkstyle.xml
@@ -24,16 +24,16 @@
             <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="ImportOrder">
-            <property name="staticGroups"
-                      value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
-            <property name="separatedStaticGroups" value="true"/>
-            <property name="groups" value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>
-            <property name="ordered" value="true"/>
-            <property name="separated" value="true"/>
-            <property name="option" value="top"/>
-            <property name="sortStaticImportsAlphabetically" value="true"/>
-        </module>
+<!--        <module name="ImportOrder">-->
+<!--            <property name="staticGroups"-->
+<!--                      value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>-->
+<!--            <property name="separatedStaticGroups" value="true"/>-->
+<!--            <property name="groups" value="org.apache,java,javax,org,com,com.baidu.hugegraph"/>-->
+<!--            <property name="ordered" value="true"/>-->
+<!--            <property name="separated" value="true"/>-->
+<!--            <property name="option" value="top"/>-->
+<!--            <property name="sortStaticImportsAlphabetically" value="true"/>-->
+<!--        </module>-->
         <module name="AvoidStarImport"/>
         <module name="RedundantImport"/>
         <module name="UnusedImports"/>