checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN" "http://www.puppycrawl.com/dtds/configuration_1_3.dtd" [
  <!ENTITY defaultJavadocChecks SYSTEM "../../../prebuilts/checkstyle/default-javadoc-checks.xml">
  <!ENTITY defaultTreewalkerChecks SYSTEM "../../../prebuilts/checkstyle/default-treewalker-checks.xml">
  <!ENTITY defaultModuleChecks SYSTEM "../../../prebuilts/checkstyle/default-module-checks.xml">
]>

<module name="Checker">
  &defaultModuleChecks;
  <module name="RegexpHeader">
    <property name="severity" value="error"/>
    <message key="header.mismatch"
             value="Google Copyright header seems to be incorrect. Expected ''{0}'' on this line."/>
    <property name="header" value="^/\*\n \* Copyright \(C\) [0-9]{4} Google LLC\.\n \*\n \* Licensed under the Apache License, Version 2\.0 \(the \&quot;License\&quot;\);\n \* you may not use this file except in compliance with the License.\n \* You may obtain a copy of the License at\n \*\n \*      http:\/\/www\.apache\.org\/licenses\/LICENSE-2\.0\n \*\n \* Unless required by applicable law or agreed to in writing, software\n \* distributed under the License is distributed on an &quot;AS IS&quot; BASIS,\n \* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.\n \* See the License for the specific language governing permissions and\n \* limitations under the License\.\n \*\/" />
  </module>
  <module name="TreeWalker">
      &defaultJavadocChecks;
      &defaultTreewalkerChecks;
  </module>
</module>