diff --git a/src/Standards/Typo3Update/Sniffs/LegacyClassnames/AbstractClassnameChecker.php b/src/Standards/Typo3Update/Sniffs/LegacyClassnames/AbstractClassnameChecker.php
index a01da60..2e9896b 100644
--- a/src/Standards/Typo3Update/Sniffs/LegacyClassnames/AbstractClassnameChecker.php
+++ b/src/Standards/Typo3Update/Sniffs/LegacyClassnames/AbstractClassnameChecker.php
@@ -212,8 +212,12 @@ abstract class AbstractClassnameChecker implements PhpCsSniff
      * @param string $classname
      * @param bool $forceEmptyPrefix Defines whether '\\' prefix should be checked or always be left out.
      */
-    protected function replaceLegacyClassname(PhpCsFile $phpcsFile, $classnamePosition, $classname, $forceEmptyPrefix = false)
-    {
+    protected function replaceLegacyClassname(
+        PhpCsFile $phpcsFile,
+        $classnamePosition,
+        $classname,
+        $forceEmptyPrefix = false
+    ) {
         $prefix = '\\';
         if ($forceEmptyPrefix || $phpcsFile->getTokens()[$classnamePosition -1]['code'] === T_NS_SEPARATOR) {
             $prefix = '';
diff --git a/src/Standards/Typo3Update/Sniffs/LegacyClassnames/InlineCommentSniff.php b/src/Standards/Typo3Update/Sniffs/LegacyClassnames/InlineCommentSniff.php
index 2b7caaf..fcf9229 100644
--- a/src/Standards/Typo3Update/Sniffs/LegacyClassnames/InlineCommentSniff.php
+++ b/src/Standards/Typo3Update/Sniffs/LegacyClassnames/InlineCommentSniff.php
@@ -60,7 +60,8 @@ class Typo3Update_Sniffs_LegacyClassnames_InlineCommentSniff extends AbstractCla
         $this->originalTokenContent = $tokens[$stackPtr]['content'];
         $commentParts = preg_split('/\s+/', $this->originalTokenContent);
 
-        if (count($commentParts) !== 5 || $commentParts[1] !== '@var' || ($commentParts[2][0] !== '$' && $commentParts[3][0] !== '$')) {
+        if (count($commentParts) !== 5 || $commentParts[1] !== '@var'
+            || ($commentParts[2][0] !== '$' && $commentParts[3][0] !== '$')) {
             return;
         }
 
diff --git a/src/Standards/Typo3Update/Sniffs/LegacyClassnames/Mapping.php b/src/Standards/Typo3Update/Sniffs/LegacyClassnames/Mapping.php
index c7c455e..16a8acf 100644
--- a/src/Standards/Typo3Update/Sniffs/LegacyClassnames/Mapping.php
+++ b/src/Standards/Typo3Update/Sniffs/LegacyClassnames/Mapping.php
@@ -28,12 +28,17 @@ use Typo3Update\Sniffs\OptionsAccessTrait;
  * Will check the configured file for whether a class is legacy and provides further methods.
  * Also can update to add new migrated class names.
  */
-class Mapping
+final class Mapping
 {
     use OptionsAccessTrait;
 
     // Singleton implementation - Start
     static protected $instance = null;
+    /**
+     * Get the singleton instance.
+     *
+     * @return Mapping
+     */
     public static function getInstance()
     {
         if (static::$instance === null) {
diff --git a/src/Standards/Typo3Update/Sniffs/LegacyClassnames/MissingNamespaceSniff.php b/src/Standards/Typo3Update/Sniffs/LegacyClassnames/MissingNamespaceSniff.php
index 3e3acac..3f8a197 100644
--- a/src/Standards/Typo3Update/Sniffs/LegacyClassnames/MissingNamespaceSniff.php
+++ b/src/Standards/Typo3Update/Sniffs/LegacyClassnames/MissingNamespaceSniff.php
@@ -59,11 +59,12 @@ class Typo3Update_Sniffs_LegacyClassnames_MissingNamespaceSniff extends Abstract
             return;
         }
         $classnamePosition = $phpcsFile->findNext(T_STRING, $stackPtr);
+
         if ($classnamePosition === false) {
             return;
         }
-        $classname = $tokens[$classnamePosition]['content'];
 
+        $classname = $tokens[$classnamePosition]['content'];
         $this->addFixableError($phpcsFile, $classnamePosition, $classname);
     }
 
@@ -94,8 +95,12 @@ class Typo3Update_Sniffs_LegacyClassnames_MissingNamespaceSniff extends Abstract
      * @param string $classname
      * @param bool $forceEmptyPrefix Defines whether '\\' prefix should be checked or always be left out.
      */
-    protected function replaceLegacyClassname(PhpCsFile $phpcsFile, $classnamePosition, $classname, $forceEmptyPrefix = true)
-    {
+    protected function replaceLegacyClassname(
+        PhpCsFile $phpcsFile,
+        $classnamePosition,
+        $classname,
+        $forceEmptyPrefix = true
+    ) {
         parent::replaceLegacyClassname($phpcsFile, $classnamePosition, $classname, $forceEmptyPrefix);
 
         $tokens = $phpcsFile->getTokens();
@@ -118,7 +123,7 @@ class Typo3Update_Sniffs_LegacyClassnames_MissingNamespaceSniff extends Abstract
 
     /**
      * @param PhpCsFile $phpcsFile
-     * @return int
+     * @return int|false
      */
     protected function getNamespacePosition(PhpCsFile $phpcsFile)
     {