added non-threaded close() method for logging

src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnify2Task.java

@@ -65,6 +65,10 @@ public class TypeUnify2Task extends TypeUnifyTask {
        	}
        
        public void closeLogFile() {
-           logFile.close();
+           if(parallel){
+               logFile.close();
+           }else{
+               logFile.closeNonThreaded();
+           }
        }
 }

src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java

@@ -186,7 +186,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 				}else{
 					this.logFile = new WriterActiveObject(new OutputStreamWriter(new NullOutputStream()), pool);
 				}
-				logFile.write("");
 			}
 			catch (IOException e) { 
 				System.err.println("log-File nicht vorhanden");
@@ -268,7 +267,11 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		Set<Set<UnifyPair>> res = unify(neweq, remainingOderconstraints, fc, parallel, rekTiefeField, new HashSet<>());
 		noOfThread--;
 
-		logFile.close();
+		if(parallel){
+			logFile.close();
+		}else{
+			logFile.closeNonThreaded();
+		}
 
 		if (isUndefinedPairSetSet(res)) { 
 			//fuer debug-Zwecke

src/main/java/de/dhbwstuttgart/typeinference/unify/WriterActiveObject.java

@@ -42,4 +42,12 @@ public class WriterActiveObject {
             throw new RuntimeException(e);
         }
     }
+
+    public void closeNonThreaded(){
+        try {
+            writer.close();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
 }