1 files changed, 7 insertions, 7 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/persistent/AbstractStoringPageFile.java b/src/de/lmu/ifi/dbs/elki/persistent/AbstractStoringPageFile.java
index bb4e915d..7151e6dd 100644
--- a/src/de/lmu/ifi/dbs/elki/persistent/AbstractStoringPageFile.java
+++ b/src/de/lmu/ifi/dbs/elki/persistent/AbstractStoringPageFile.java
@@ -4,7 +4,7 @@ package de.lmu.ifi.dbs.elki.persistent;
  This file is part of ELKI:
  Environment for Developing KDD-Applications Supported by Index-Structures
 
- Copyright (C) 2011
+ Copyright (C) 2012
  Ludwig-Maximilians-Universität München
  Lehr- und Forschungseinheit für Datenbanksysteme
  ELKI Development Team
@@ -67,11 +67,11 @@ public abstract class AbstractStoringPageFile<P extends Page> extends AbstractPa
    * @param page the page to set the id
    */
   @Override
-  public Integer setPageID(P page) {
-    Integer pageID = page.getPageID();
-    if(pageID == null) {
+  public int setPageID(P page) {
+    int pageID = page.getPageID();
+    if(pageID == -1) {
       pageID = getNextEmptyPageID();
-      if(pageID == null) {
+      if(pageID == -1) {
         pageID = nextPageID++;
       }
       page.setPageID(pageID);
@@ -95,12 +95,12 @@ public abstract class AbstractStoringPageFile<P extends Page> extends AbstractPa
    * 
    * @return the next empty page id
    */
-  private Integer getNextEmptyPageID() {
+  private int getNextEmptyPageID() {
     if(!emptyPages.empty()) {
       return emptyPages.pop();
     }
     else {
-      return null;
+      return -1;
     }
   }