Index: trunk/autoquest-core-usability-evaluation/src/main/java/de/ugoe/cs/autoquest/usability/util/TextInputUtil.java
===================================================================
--- trunk/autoquest-core-usability-evaluation/src/main/java/de/ugoe/cs/autoquest/usability/util/TextInputUtil.java	(revision 1036)
+++ trunk/autoquest-core-usability-evaluation/src/main/java/de/ugoe/cs/autoquest/usability/util/TextInputUtil.java	(revision 1040)
@@ -1,2 +1,16 @@
+//   Copyright 2012 Georg-August-Universität Göttingen, Germany
+//
+//   Licensed under the Apache License, Version 2.0 (the "License");
+//   you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+
 package de.ugoe.cs.autoquest.usability.util;
 
@@ -15,9 +29,21 @@
 import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskTreeNode;
 
+/**
+ * <p>
+ * TODO comment
+ * </p>
+ * 
+ * @author Alexander Deicke
+ */
 public class TextInputUtil {
-    
-    public static Multiset<String> aggregateEnteredTextFromTextInputs(List<ITaskTreeNode> nodesWithTextInputEvents) {
+
+    private TextInputUtil() {
+        // util class
+    }
+
+    public static Multiset<String> aggregateEnteredTextFromTextInputs(List<ITaskTreeNode> nodesWithTextInputEvents)
+    {
         List<Iterable<String>> allTextInputs = Lists.newArrayList();
-        for(ITaskTreeNode nodeWithTextInput : nodesWithTextInputEvents) {
+        for (ITaskTreeNode nodeWithTextInput : nodesWithTextInputEvents) {
             TextInput textInput = (TextInput) ((IEventTask) nodeWithTextInput).getEventType();
             allTextInputs.add(splitTextIntoWordsAndSigns(textInput.getEnteredText()));
@@ -25,32 +51,38 @@
         return HashMultiset.create(Iterables.concat(allTextInputs));
     }
-    
+
     public static Iterable<String> splitTextIntoWordsAndSigns(String enteredText) {
-        CharMatcher onlyWords = CharMatcher.WHITESPACE.or(CharMatcher.forPredicate(characterIsJavaIdentifierPartPredicate()));
-        CharMatcher onlySigns = CharMatcher.WHITESPACE.or(CharMatcher.forPredicate(characterIsJavaIdentifierPartPredicate()).negate());
-        Iterable<String> words = Splitter.on(onlyWords).omitEmptyStrings().trimResults().split(enteredText);
-        Iterable<String> signs = Splitter.on(onlySigns).omitEmptyStrings().trimResults().split(enteredText);
+        CharMatcher onlyWords =
+            CharMatcher.WHITESPACE.or(CharMatcher
+                .forPredicate(characterIsJavaIdentifierPartPredicate()));
+        CharMatcher onlySigns =
+            CharMatcher.WHITESPACE.or(CharMatcher
+                .forPredicate(characterIsJavaIdentifierPartPredicate()).negate());
+        Iterable<String> words =
+            Splitter.on(onlyWords).omitEmptyStrings().trimResults().split(enteredText);
+        Iterable<String> signs =
+            Splitter.on(onlySigns).omitEmptyStrings().trimResults().split(enteredText);
         return Iterables.concat(words, signs);
     }
-    
+
     public static Predicate<Character> characterIsJavaIdentifierPartPredicate() {
         return new Predicate<Character>() {
-            
+
             @Override
             public boolean apply(Character character) {
-               return  !Character.isJavaIdentifierPart(character);
+                return !Character.isJavaIdentifierPart(character);
             }
-            
+
         };
     }
-    
+
     public static Predicate<Character> characterIsLetterOrDigitPredicate() {
         return new Predicate<Character>() {
-            
+
             @Override
             public boolean apply(Character character) {
                 return !Character.isLetterOrDigit(character);
             }
-            
+
         };
     }
