Index: src/java/org/apache/lucene/search/PrefixTermEnum.java
===================================================================
--- src/java/org/apache/lucene/search/PrefixTermEnum.java	(revision 783244)
+++ src/java/org/apache/lucene/search/PrefixTermEnum.java	(working copy)
@@ -15,7 +15,7 @@
  */
 public class PrefixTermEnum extends FilteredTermEnum {
 
-  private Term prefix;
+  private final Term prefix;
   private boolean endEnum = false;
 
   public PrefixTermEnum(IndexReader reader, Term prefix) throws IOException {
@@ -28,11 +28,15 @@
     return 1.0f;
   }
 
-  protected boolean endEnum() {
+  protected final boolean endEnum() {
     return endEnum;
   }
+  
+  protected final int prefixLength() {
+      return prefix.text().length();
+  }
 
-  protected boolean termCompare(Term term) {
+  protected final boolean termCompare(Term term) {
     if (term.field() == prefix.field() && term.text().startsWith(prefix.text())) {                                                                              
       return true;
     }