diff --git a/application/src/Domain/AbstractDomainService.php b/application/src/Domain/AbstractDomainService.php
index 8992f3a..6a0381c 100644
--- a/application/src/Domain/AbstractDomainService.php
+++ b/application/src/Domain/AbstractDomainService.php
@@ -1,7 +1,7 @@
 <?php
+
 namespace App\Domain;
 
 abstract class AbstractDomainService
 {
 }
-
diff --git a/application/src/Domain/SourceManagement/AbstractSourceService.php b/application/src/Domain/SourceManagement/AbstractSourceService.php
index 9ec2d46..16cc73b 100644
--- a/application/src/Domain/SourceManagement/AbstractSourceService.php
+++ b/application/src/Domain/SourceManagement/AbstractSourceService.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace App\Domain\SourceManagement;
 
 use App\Domain\AbstractDomainService;
@@ -6,4 +7,3 @@ use App\Domain\AbstractDomainService;
 abstract class AbstractSourceService extends AbstractDomainService
 {
 }
-
diff --git a/application/src/Domain/SourceManagement/TreeSourceService.php b/application/src/Domain/SourceManagement/TreeSourceService.php
index 319dabf..77b0e7a 100644
--- a/application/src/Domain/SourceManagement/TreeSourceService.php
+++ b/application/src/Domain/SourceManagement/TreeSourceService.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace App\Domain\SourceManagement;
 
 use App\Entity\Source\Collection\TreeCollectionSourceInterface;
@@ -8,9 +9,10 @@ use Doctrine\Common\Collections\ArrayCollection;
 use App\Entity\Source\SourceInterface;
 
 /**
- * 
- * Allows to iterate over a tree
+ * Allows to iterate over a tree.
+ *
  * @author kevinfrantz
+ *
  * @todo Maybe lazy loading would be helpfull for performance
  */
 final class TreeSourceService extends AbstractSourceService implements TreeSourceServiceInterface
@@ -19,38 +21,44 @@ final class TreeSourceService extends AbstractSourceService implements TreeSourc
      * @var TreeCollectionSourceInterface
      */
     private $source;
-    
+
     /**
-     * Containes all branches of the actual level of the tree
+     * Containes all branches of the actual level of the tree.
+     *
      * @var Collection
      */
     private $branches;
-    
+
     /**
-     * Containes all leaves of the actual level of the tree
+     * Containes all leaves of the actual level of the tree.
+     *
      * @var Collection
      */
     private $leaves;
-    
-    public function __construct(TreeCollectionSource $source){
+
+    public function __construct(TreeCollectionSource $source)
+    {
         $this->source = $source;
         $this->branches = new ArrayCollection();
         $this->leaves = new ArrayCollection();
     }
-    
-    private function sortMember(SourceInterface $member):bool{
-        if($member instanceof TreeCollectionSource){
+
+    private function sortMember(SourceInterface $member): bool
+    {
+        if ($member instanceof TreeCollectionSource) {
             return $this->branches->add($member);
         }
+
         return $this->leaves->add($member);
     }
-    
-    private function basicSort():void{
-        foreach($this->source->getCollection() as $member){
-            $this->sortMember($member);        
+
+    private function basicSort(): void
+    {
+        foreach ($this->source->getCollection() as $member) {
+            $this->sortMember($member);
         }
     }
-    
+
     public function getBranches(): Collection
     {
         return $this->branches;
@@ -58,29 +66,31 @@ final class TreeSourceService extends AbstractSourceService implements TreeSourc
 
     /**
      * @todo Remove the optional parameter and put the logic in a private funtion.
-     * @todo Remove the getAllBranches use inside the function. 
-     * {@inheritDoc}
+     * @todo Remove the getAllBranches use inside the function.
+     * {@inheritdoc}
+     *
      * @see \App\Domain\SourceManagement\TreeSourceServiceInterface::getAllBranches()
      */
     public function getAllBranches(): Collection
     {
         $allBranches = new ArrayCollection($this->branches->toArray());
-        foreach($this->branches->toArray() as $branch){
+        foreach ($this->branches->toArray() as $branch) {
             $this->itterateOverBranch($branch, $allBranches);
         }
+
         return $allBranches;
     }
-    
-    private function itterateOverBranch(TreeCollectionSourceInterface $branch,ArrayCollection $allBranches):void{
-        if(!$allBranches->contains($branch)){
+
+    private function itterateOverBranch(TreeCollectionSourceInterface $branch, ArrayCollection $allBranches): void
+    {
+        if (!$allBranches->contains($branch)) {
             $allBranches->add($branch);
-            foreach((new self($branch))->getBranches() as $branchBranch){
+            foreach ((new self($branch))->getBranches() as $branchBranch) {
                 $allBranches->add($branchBranch);
             }
         }
     }
-    
-    
+
     public function getLeaves(): Collection
     {
         return $this->leaves;
@@ -89,14 +99,14 @@ final class TreeSourceService extends AbstractSourceService implements TreeSourc
     public function getAllLeaves(): Collection
     {
         $leaves = new ArrayCollection();
-        foreach ($this->getAllBranches()->toArray() as $branch){
-            foreach ((new self($branch))->getLeaves() as $leave){
-                if(!$leaves->contains($leave)){
+        foreach ($this->getAllBranches()->toArray() as $branch) {
+            foreach ((new self($branch))->getLeaves() as $leave) {
+                if (!$leaves->contains($leave)) {
                     $leaves->add($leave);
                 }
             }
         }
+
         return $leaves;
     }
- 
-}
\ No newline at end of file
+}
diff --git a/application/src/Domain/SourceManagement/TreeSourceServiceInterface.php b/application/src/Domain/SourceManagement/TreeSourceServiceInterface.php
index 8aa7da9..9cadc83 100644
--- a/application/src/Domain/SourceManagement/TreeSourceServiceInterface.php
+++ b/application/src/Domain/SourceManagement/TreeSourceServiceInterface.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace App\Domain\SourceManagement;
 
 use Doctrine\Common\Collections\Collection;
@@ -6,27 +7,30 @@ use Doctrine\Common\Collections\Collection;
 interface TreeSourceServiceInterface
 {
     /**
-     * Delivers the branches of the actual tree back
+     * Delivers the branches of the actual tree back.
+     *
      * @return Collection
      */
-    public function getBranches():Collection;
-    
-    /**
-     * Delivers the members of the actual tree back
-     * @return Collection
-     */
-    public function getLeaves():Collection;
-    
-    /**
-     * Delivers all members till a infinite level of the tree back
-     * @return Collection
-     */
-    public function getAllLeaves():Collection;
-    
-    /**
-     * Delivers all branches till a infinite level of the actual tree back
-     * @return Collection
-     */
-    public function getAllBranches():Collection;
-}
+    public function getBranches(): Collection;
 
+    /**
+     * Delivers the members of the actual tree back.
+     *
+     * @return Collection
+     */
+    public function getLeaves(): Collection;
+
+    /**
+     * Delivers all members till a infinite level of the tree back.
+     *
+     * @return Collection
+     */
+    public function getAllLeaves(): Collection;
+
+    /**
+     * Delivers all branches till a infinite level of the actual tree back.
+     *
+     * @return Collection
+     */
+    public function getAllBranches(): Collection;
+}
diff --git a/application/src/Exception/NotSortableException.php b/application/src/Exception/NotSortableException.php
index 3120670..aedd944 100644
--- a/application/src/Exception/NotSortableException.php
+++ b/application/src/Exception/NotSortableException.php
@@ -1,6 +1,7 @@
 <?php
+
 namespace App\Exception;
 
 class NotSortableException extends \Exception
 {
-}
\ No newline at end of file
+}