code cleanup

src/main/java/fr/pasteur/ida/zellige/surfaceConstruction/element/os/OSEStartingStatus.java

 package fr.pasteur.ida.zellige.surfaceConstruction.element.os;
 
-import java.util.Set;
 import java.util.TreeMap;
-import java.util.TreeSet;
 
 public class OSEStartingStatus extends TreeMap<Integer, Integer>
 {
-    private int dimension;
+    private final int dimension;
     private int minimumSize;
 
     public OSEStartingStatus( int dimension )
@@ -21,7 +19,7 @@ public class OSEStartingStatus extends TreeMap<Integer, Integer>
         if (this.size() != 0)
         {
 
-            if ( dimension == 0 )
+            if ( this.dimension == 0 )
             {
                 for ( int i = 0; this.size() > 20 && i <= this.size()* 0.75 ;i++ )
                 {