Enhancing the PR for DS-1990.

Adds a cache to the Identifier array in the DSpaceObject class.
Renames the method from lookupIdentifiers into getIdentifiers.

dspace-api/src/main/java/org/dspace/content/Bitstream.java

@@ -212,7 +212,7 @@ public class Bitstream extends DSpaceObject
         bitstream.setFormat(null);
 
         context.addEvent(new Event(Event.CREATE, Constants.BITSTREAM, 
-                bitstreamID, null, bitstream.lookupIdentifiers(context)));
+                bitstreamID, null, bitstream.getIdentifiers(context)));
 
         return bitstream;
     }
@@ -248,7 +248,7 @@ public class Bitstream extends DSpaceObject
         bitstream.setFormat(null);
 
         context.addEvent(new Event(Event.CREATE, Constants.BITSTREAM, 
-                bitstreamID, "REGISTER", bitstream.lookupIdentifiers(context)));
+                bitstreamID, "REGISTER", bitstream.getIdentifiers(context)));
 
         return bitstream;
     }
@@ -509,14 +509,14 @@ public class Bitstream extends DSpaceObject
         if (modified)
         {
             bContext.addEvent(new Event(Event.MODIFY, Constants.BITSTREAM, 
-                    getID(), null, lookupIdentifiers(bContext)));
+                    getID(), null, getIdentifiers(bContext)));
             modified = false;
         }
         if (modifiedMetadata)
         {
             bContext.addEvent(new Event(Event.MODIFY_METADATA, 
                     Constants.BITSTREAM, getID(), getDetails(),
-                    lookupIdentifiers(bContext)));
+                    getIdentifiers(bContext)));
             modifiedMetadata = false;
             clearDetails();
         }
@@ -544,7 +544,7 @@ public class Bitstream extends DSpaceObject
                 "bitstream_id=" + getID()));
 
         bContext.addEvent(new Event(Event.DELETE, Constants.BITSTREAM, getID(), 
-                String.valueOf(getSequenceID()), lookupIdentifiers(bContext)));
+                String.valueOf(getSequenceID()), getIdentifiers(bContext)));
 
         // Remove from cache
         bContext.removeCached(this, getID());
@@ -751,6 +751,6 @@ public class Bitstream extends DSpaceObject
     {
         //Also fire a modified event since the bitstream HAS been modified
         bContext.addEvent(new Event(Event.MODIFY, Constants.BITSTREAM, getID(), 
-                null, lookupIdentifiers(bContext)));
+                null, getIdentifiers(bContext)));
     }
 }

dspace-api/src/main/java/org/dspace/content/Bundle.java

@@ -448,7 +448,7 @@ public class Bundle extends DSpaceObject
 
         ourContext.addEvent(new Event(Event.ADD, Constants.BUNDLE, getID(), 
                 Constants.BITSTREAM, b.getID(), String.valueOf(b.getSequenceID()),
-                lookupIdentifiers(ourContext)));
+                getIdentifiers(ourContext)));
 
         // copy authorization policies from bundle to bitstream
         // FIXME: multiple inclusion is affected by this...
@@ -553,7 +553,7 @@ public class Bundle extends DSpaceObject
 
         ourContext.addEvent(new Event(Event.REMOVE, Constants.BUNDLE, getID(), 
                 Constants.BITSTREAM, b.getID(), String.valueOf(b.getSequenceID()),
-                lookupIdentifiers(ourContext)));
+                getIdentifiers(ourContext)));
 
         //Ensure that the last modified from the item is triggered !
         Item owningItem = (Item) getParentObject();
@@ -614,13 +614,13 @@ public class Bundle extends DSpaceObject
         if (modified)
         {
             ourContext.addEvent(new Event(Event.MODIFY, Constants.BUNDLE, getID(),
-                    null, lookupIdentifiers(ourContext)));
+                    null, getIdentifiers(ourContext)));
             modified = false;
         }
         if (modifiedMetadata)
         {
             ourContext.addEvent(new Event(Event.MODIFY_METADATA, Constants.BUNDLE,
-                    getID(), null, lookupIdentifiers(ourContext)));
+                    getID(), null, getIdentifiers(ourContext)));
             modifiedMetadata = false;
         }
 
@@ -638,7 +638,7 @@ public class Bundle extends DSpaceObject
                 + getID()));
 
         ourContext.addEvent(new Event(Event.DELETE, Constants.BUNDLE, getID(), 
-                getName(), lookupIdentifiers(ourContext)));
+                getName(), getIdentifiers(ourContext)));
 
         // Remove from cache
         ourContext.removeCached(this, getID());

dspace-api/src/main/java/org/dspace/content/Collection.java

@@ -280,7 +280,7 @@ public class Collection extends DSpaceObject
         myPolicy.update();
 
         context.addEvent(new Event(Event.CREATE, Constants.COLLECTION, 
-                c.getID(), c.handle, c.lookupIdentifiers(context)));
+                c.getID(), c.handle, c.getIdentifiers(context)));
 
         log.info(LogManager.getHeader(context, "create_collection",
                 "collection_id=" + row.getIntColumn("collection_id"))
@@ -971,7 +971,7 @@ public class Collection extends DSpaceObject
         }
 
         ourContext.addEvent(new Event(Event.MODIFY, Constants.COLLECTION, 
-                getID(), "remove_template_item", lookupIdentifiers(ourContext)));
+                getID(), "remove_template_item", getIdentifiers(ourContext)));
     }
 
     /**
@@ -1003,7 +1003,7 @@ public class Collection extends DSpaceObject
 
         ourContext.addEvent(new Event(Event.ADD, Constants.COLLECTION, getID(), 
                 Constants.ITEM, item.getID(), item.getHandle(), 
-                lookupIdentifiers(ourContext)));
+                getIdentifiers(ourContext)));
     }
 
     /**
@@ -1043,7 +1043,7 @@ public class Collection extends DSpaceObject
 
         ourContext.addEvent(new Event(Event.REMOVE, Constants.COLLECTION, 
                 getID(), Constants.ITEM, item.getID(), item.getHandle(),
-                lookupIdentifiers(ourContext)));
+                getIdentifiers(ourContext)));
     }
 
     /**
@@ -1067,14 +1067,14 @@ public class Collection extends DSpaceObject
         if (modified)
         {
             ourContext.addEvent(new Event(Event.MODIFY, Constants.COLLECTION, 
-                    getID(), null, lookupIdentifiers(ourContext)));
+                    getID(), null, getIdentifiers(ourContext)));
             modified = false;
         }
         if (modifiedMetadata)
         {
             ourContext.addEvent(new Event(Event.MODIFY_METADATA, 
                     Constants.COLLECTION, getID(), getDetails(), 
-                    lookupIdentifiers(ourContext)));
+                    getIdentifiers(ourContext)));
             modifiedMetadata = false;
             clearDetails();
         }
@@ -1141,7 +1141,7 @@ public class Collection extends DSpaceObject
                 "collection_id=" + getID()));
 
         ourContext.addEvent(new Event(Event.DELETE, Constants.COLLECTION, 
-                getID(), getHandle(), lookupIdentifiers(ourContext)));
+                getID(), getHandle(), getIdentifiers(ourContext)));
 
         // Remove from cache
         ourContext.removeCached(this, getID());
@@ -1577,6 +1577,6 @@ public class Collection extends DSpaceObject
     {
         //Also fire a modified event since the collection HAS been modified
         ourContext.addEvent(new Event(Event.MODIFY, Constants.COLLECTION, 
-                getID(), null, lookupIdentifiers(ourContext)));
+                getID(), null, getIdentifiers(ourContext)));
     }
 }

dspace-api/src/main/java/org/dspace/content/Community.java

@@ -233,14 +233,14 @@ public class Community extends DSpaceObject
         myPolicy.update();
 
         context.addEvent(new Event(Event.CREATE, Constants.COMMUNITY, c.getID(), 
-                c.handle, c.lookupIdentifiers(context)));
+                c.handle, c.getIdentifiers(context)));
 
         // if creating a top-level Community, simulate an ADD event at the Site.
         if (parent == null)
         {
             context.addEvent(new Event(Event.ADD, Constants.SITE, Site.SITE_ID, 
                     Constants.COMMUNITY, c.getID(), c.handle, 
-                    c.lookupIdentifiers(context)));
+                    c.getIdentifiers(context)));
         }
 
         log.info(LogManager.getHeader(context, "create_community",
@@ -531,14 +531,14 @@ public class Community extends DSpaceObject
         if (modified)
         {
             ourContext.addEvent(new Event(Event.MODIFY, Constants.COMMUNITY, 
-                    getID(), null, lookupIdentifiers(ourContext)));
+                    getID(), null, getIdentifiers(ourContext)));
             modified = false;
         }
         if (modifiedMetadata)
         {
             ourContext.addEvent(new Event(Event.MODIFY_METADATA, 
                     Constants.COMMUNITY, getID(), getDetails(), 
-                    lookupIdentifiers(ourContext)));
+                    getIdentifiers(ourContext)));
             modifiedMetadata = false;
             clearDetails();
         }
@@ -911,7 +911,7 @@ public class Community extends DSpaceObject
 
                 ourContext.addEvent(new Event(Event.ADD, Constants.COMMUNITY, 
                         getID(), Constants.COLLECTION, c.getID(), c.getHandle(),
-                        lookupIdentifiers(ourContext)));
+                        getIdentifiers(ourContext)));
 
                 DatabaseManager.insert(ourContext, mappingRow);
             }
@@ -988,7 +988,7 @@ public class Community extends DSpaceObject
 
                 ourContext.addEvent(new Event(Event.ADD, Constants.COMMUNITY, 
                         getID(), Constants.COMMUNITY, c.getID(), c.getHandle(),
-                        lookupIdentifiers(ourContext)));
+                        getIdentifiers(ourContext)));
 
                 DatabaseManager.insert(ourContext, mappingRow);
             }
@@ -1026,7 +1026,7 @@ public class Community extends DSpaceObject
             // Capture ID & Handle of Collection we are removing, so we can trigger events later
             int removedId = c.getID();
             String removedHandle = c.getHandle();
-            String[] removedIdentifiers = c.lookupIdentifiers(ourContext);
+            String[] removedIdentifiers = c.getIdentifiers(ourContext);
 
             // How many parent(s) does this collection have?
             TableRow trow = DatabaseManager.querySingle(ourContext,
@@ -1087,7 +1087,7 @@ public class Community extends DSpaceObject
             // Capture ID & Handle of Community we are removing, so we can trigger events later
             int removedId = c.getID();
             String removedHandle = c.getHandle();
-            String[] removedIdentifiers = c.lookupIdentifiers(ourContext);
+            String[] removedIdentifiers = c.getIdentifiers(ourContext);
         
             // How many parent(s) does this subcommunity have?
             TableRow trow = DatabaseManager.querySingle(ourContext,
@@ -1158,7 +1158,7 @@ public class Community extends DSpaceObject
 
             // Since this is a top level Community, simulate a REMOVE event at the Site.
             ourContext.addEvent(new Event(Event.REMOVE, Constants.SITE, Site.SITE_ID,
-                    Constants.COMMUNITY, getID(), getHandle(), lookupIdentifiers(ourContext)));
+                    Constants.COMMUNITY, getID(), getHandle(), getIdentifiers(ourContext)));
         } else {
             // This is a subcommunity, so let the parent remove it
             // NOTE: this essentially just logs event and calls "rawDelete()"
@@ -1182,7 +1182,7 @@ public class Community extends DSpaceObject
         // Capture ID & Handle of object we are removing, so we can trigger events later
         int deletedId = getID();
         String deletedHandle = getHandle();
-        String[] deletedIdentifiers = lookupIdentifiers(ourContext);
+        String[] deletedIdentifiers = getIdentifiers(ourContext);
 
         // Remove Community object from cache
         ourContext.removeCached(this, getID());
@@ -1401,6 +1401,6 @@ public class Community extends DSpaceObject
     {
         //Also fire a modified event since the community HAS been modified
         ourContext.addEvent(new Event(Event.MODIFY, Constants.COMMUNITY, 
-                getID(), null, lookupIdentifiers(ourContext)));
+                getID(), null, getIdentifiers(ourContext)));
     }
 }

dspace-api/src/main/java/org/dspace/content/DSpaceObject.java

@@ -30,6 +30,8 @@ public abstract class DSpaceObject
     // e.g. to document metadata fields touched, etc.
     private StringBuffer eventDetails = null;
     
+    private String[] identifiers = null;
+
     /**
      * Reset the cache of event details.
      */
@@ -109,26 +111,52 @@ public abstract class DSpaceObject
      * Tries to lookup all Identifiers of this DSpaceObject.
      * @return An array containing all found identifiers or an array with a length of 0.
      */
-    public String[] lookupIdentifiers(Context context)
+    public String[] getIdentifiers(Context context)
     {
-        String[] identifiers = new String[0];
+        if (identifiers == null)
-        IdentifierService identifierService = 
-                new DSpace().getSingletonService(IdentifierService.class);
-        
-        if (identifierService != null)
         {
-            return identifierService.lookup(context, this);
+            log.debug("This DSO's identifiers cache is empty, looking for identifiers...");
+            identifiers = new String[0];
+
+            IdentifierService identifierService = 
+                    new DSpace().getSingletonService(IdentifierService.class);
+
+            if (identifierService != null)
+            {
+                identifiers = identifierService.lookup(context, this);
+            } else {
+                log.warn("No IdentifierService found, will return an array containing "
+                        + "the Handle only.");
+                if (getHandle() != null)
+                {
+                    identifiers = new String[] { HandleManager.getCanonicalForm(getHandle()) };
+                }
+            }
         }
 
-        log.warn("No IdentifierService found, will return an array containing "
+        if (log.isDebugEnabled())
-                + "the Handle only.");
-        
-        if (getHandle() != null)
         {
-            return new String[] { HandleManager.getCanonicalForm(getHandle()) };
+            StringBuilder dbgMsg = new StringBuilder();
+            for (String id : identifiers)
+            {
+                if (dbgMsg.capacity() == 0)
+                {
+                    dbgMsg.append("This DSO's Identifiers are: ");
+                } else {
+                    dbgMsg.append(", ");
+                }
+                dbgMsg.append(id);
+            }
+            dbgMsg.append(".");
+            log.debug(dbgMsg.toString());
         }
 
-        return new String[0];
+        return identifiers;
+    }
+    
+    public void resetIdentifiersCache()
+    {
+        identifiers = null;
     }
 
     /**

dspace-api/src/main/java/org/dspace/content/InstallItem.java

@@ -224,7 +224,7 @@ public class InstallItem
 
         // Notify interested parties of newly archived Item
         c.addEvent(new Event(Event.INSTALL, Constants.ITEM, item.getID(),
-                item.getHandle(), item.lookupIdentifiers(c)));
+                item.getHandle(), item.getIdentifiers(c)));
 
         // remove in-progress submission
         is.deleteWrapper();

dspace-api/src/main/java/org/dspace/content/Item.java

@@ -201,7 +201,7 @@ public class Item extends DSpaceObject
         context.restoreAuthSystemState();
 
         context.addEvent(new Event(Event.CREATE, Constants.ITEM, i.getID(), 
-                null, i.lookupIdentifiers(context)));
+                null, i.getIdentifiers(context)));
 
         log.info(LogManager.getHeader(context, "create_item", "item_id="
                 + row.getIntColumn("item_id")));
@@ -358,7 +358,7 @@ public class Item extends DSpaceObject
             itemRow.setColumn("last_modified", lastModified);
             DatabaseManager.updateQuery(ourContext, "UPDATE item SET last_modified = ? WHERE item_id= ? ", lastModified, getID());
             //Also fire a modified event since the item HAS been modified
-            ourContext.addEvent(new Event(Event.MODIFY, Constants.ITEM, getID(), null, lookupIdentifiers(ourContext)));
+            ourContext.addEvent(new Event(Event.MODIFY, Constants.ITEM, getID(), null, getIdentifiers(ourContext)));
         } catch (SQLException e) {
             log.error(LogManager.getHeader(ourContext, "Error while updating last modified timestamp", "Item: " + getID()));
         }
@@ -1307,7 +1307,7 @@ public class Item extends DSpaceObject
 
         ourContext.addEvent(new Event(Event.ADD, Constants.ITEM, getID(), 
                 Constants.BUNDLE, b.getID(), b.getName(), 
-                lookupIdentifiers(ourContext)));
+                getIdentifiers(ourContext)));
     }
 
     /**
@@ -1349,7 +1349,7 @@ public class Item extends DSpaceObject
                 getID(), b.getID());
 
         ourContext.addEvent(new Event(Event.REMOVE, Constants.ITEM, getID(), 
-                Constants.BUNDLE, b.getID(), b.getName(), lookupIdentifiers(ourContext)));
+                Constants.BUNDLE, b.getID(), b.getName(), getIdentifiers(ourContext)));
 
         // If the bundle is orphaned, it's removed
         TableRowIterator tri = DatabaseManager.query(ourContext,
@@ -1810,13 +1810,13 @@ public class Item extends DSpaceObject
             if (dublinCoreChanged)
             {
                 ourContext.addEvent(new Event(Event.MODIFY_METADATA, Constants.ITEM, getID(), 
-                        getDetails(), lookupIdentifiers(ourContext)));
+                        getDetails(), getIdentifiers(ourContext)));
                 clearDetails();
                 dublinCoreChanged = false;
             }
 
             ourContext.addEvent(new Event(Event.MODIFY, Constants.ITEM, getID(), 
-                    null, lookupIdentifiers(ourContext)));
+                    null, getIdentifiers(ourContext)));
             modified = false;
         }
     }
@@ -1909,7 +1909,7 @@ public class Item extends DSpaceObject
         update();
 
         ourContext.addEvent(new Event(Event.MODIFY, Constants.ITEM, getID(), 
-                "WITHDRAW", lookupIdentifiers(ourContext)));
+                "WITHDRAW", getIdentifiers(ourContext)));
 
         // remove all authorization policies, saving the custom ones
         AuthorizeManager.removeAllPoliciesByDSOAndTypeNotEqualsTo(ourContext, this, ResourcePolicy.TYPE_CUSTOM);
@@ -1967,7 +1967,7 @@ public class Item extends DSpaceObject
         update();
 
         ourContext.addEvent(new Event(Event.MODIFY, Constants.ITEM, getID(), 
-                "REINSTATE", lookupIdentifiers(ourContext)));
+                "REINSTATE", getIdentifiers(ourContext)));
 
         // authorization policies
         if (colls.length > 0)
@@ -2001,7 +2001,7 @@ public class Item extends DSpaceObject
         AuthorizeManager.authorizeAction(ourContext, this, Constants.REMOVE);
 
         ourContext.addEvent(new Event(Event.DELETE, Constants.ITEM, getID(), 
-                getHandle(), lookupIdentifiers(ourContext)));
+                getHandle(), getIdentifiers(ourContext)));
 
         log.info(LogManager.getHeader(ourContext, "delete_item", "item_id="
                 + getID()));
@@ -2424,7 +2424,7 @@ public class Item extends DSpaceObject
             // so we only do this here if the owning collection hasn't changed.
             
             ourContext.addEvent(new Event(Event.MODIFY, Constants.ITEM, getID(), 
-                    null, lookupIdentifiers(ourContext)));
+                    null, getIdentifiers(ourContext)));
         }
     }
     

dspace-api/src/main/java/org/dspace/eperson/EPerson.java

@@ -547,7 +547,7 @@ public class EPerson extends DSpaceObject
                 + e.getID()));
 
         context.addEvent(new Event(Event.CREATE, Constants.EPERSON, e.getID(), 
-                null, e.lookupIdentifiers(context)));
+                null, e.getIdentifiers(context)));
 
         return e;
     }
@@ -578,7 +578,7 @@ public class EPerson extends DSpaceObject
         }
 
         myContext.addEvent(new Event(Event.DELETE, Constants.EPERSON, getID(), 
-                getEmail(), lookupIdentifiers(myContext)));
+                getEmail(), getIdentifiers(myContext)));
 
         // Remove from cache
         myContext.removeCached(this, getID());
@@ -1008,13 +1008,13 @@ public class EPerson extends DSpaceObject
         if (modified)
         {
             myContext.addEvent(new Event(Event.MODIFY, Constants.EPERSON, 
-                    getID(), null, lookupIdentifiers(myContext)));
+                    getID(), null, getIdentifiers(myContext)));
             modified = false;
         }
         if (modifiedMetadata)
         {
             myContext.addEvent(new Event(Event.MODIFY_METADATA, Constants.EPERSON, 
-                    getID(), getDetails(), lookupIdentifiers(myContext)));
+                    getID(), getDetails(), getIdentifiers(myContext)));
             modifiedMetadata = false;
             clearDetails();
         }

dspace-api/src/main/java/org/dspace/eperson/Group.java

@@ -215,7 +215,7 @@ public class Group extends DSpaceObject
                 + g.getID()));
 
         context.addEvent(new Event(Event.CREATE, Constants.GROUP, g.getID(),
-                null, g.lookupIdentifiers(context)));
+                null, g.getIdentifiers(context)));
 
         return g;
     }
@@ -273,7 +273,7 @@ public class Group extends DSpaceObject
 
         myContext.addEvent(new Event(Event.ADD, Constants.GROUP, getID(), 
                 Constants.EPERSON, e.getID(), e.getEmail(), 
-                lookupIdentifiers(myContext)));
+                getIdentifiers(myContext)));
     }
 
     /**
@@ -297,7 +297,7 @@ public class Group extends DSpaceObject
 
         myContext.addEvent(new Event(Event.ADD, Constants.GROUP, getID(), 
                 Constants.GROUP, g.getID(), g.getName(), 
-                lookupIdentifiers(myContext)));
+                getIdentifiers(myContext)));
     }
 
     /**
@@ -315,7 +315,7 @@ public class Group extends DSpaceObject
             epeopleChanged = true;
             myContext.addEvent(new Event(Event.REMOVE, Constants.GROUP, getID(), 
                     Constants.EPERSON, e.getID(), e.getEmail(), 
-                    lookupIdentifiers(myContext)));
+                    getIdentifiers(myContext)));
         }
     }
 
@@ -333,7 +333,7 @@ public class Group extends DSpaceObject
             groupsChanged = true;
             myContext.addEvent(new Event(Event.REMOVE, Constants.GROUP, getID(), 
                     Constants.GROUP, g.getID(), g.getName(),
-                    lookupIdentifiers(myContext)));
+                    getIdentifiers(myContext)));
         }
     }
 
@@ -1007,7 +1007,7 @@ public class Group extends DSpaceObject
         // FIXME: authorizations
 
         myContext.addEvent(new Event(Event.DELETE, Constants.GROUP, getID(), 
-                getName(), lookupIdentifiers(myContext)));
+                getName(), getIdentifiers(myContext)));
 
         // Remove from cache
         myContext.removeCached(this, getID());
@@ -1116,7 +1116,7 @@ public class Group extends DSpaceObject
         if (modifiedMetadata)
         {
             myContext.addEvent(new Event(Event.MODIFY_METADATA, Constants.GROUP, 
-                    getID(), getDetails(), lookupIdentifiers(myContext)));
+                    getID(), getDetails(), getIdentifiers(myContext)));
             modifiedMetadata = false;
             clearDetails();
         }

dspace-api/src/main/java/org/dspace/identifier/IdentifierServiceImpl.java

@@ -82,6 +82,7 @@ public class IdentifierServiceImpl implements IdentifierService {
         {
             service.register(context, dso);
         }
+        dso.resetIdentifiersCache();
         //Update our item
         dso.update();
     }
@@ -105,6 +106,7 @@ public class IdentifierServiceImpl implements IdentifierService {
             throw new IdentifierException("Cannot register identifier: Didn't "
                 + "find a provider that supports this identifier.");
         }
+        object.resetIdentifiersCache();
         //Update our item
         object.update();
     }
@@ -160,6 +162,13 @@ public class IdentifierServiceImpl implements IdentifierService {
                     identifiers.add(result);
                 }
             }
+            catch (IdentifierNotFoundException ex)
+            {
+                log.info(service.getClass().getName() + " doesn't find an "
+                        + "Identifier for " + dso.getTypeText() + ", " 
+                        + Integer.toString(dso.getID()) + ".");
+                log.debug(ex.getMessage(), ex);
+            }
             catch (IdentifierException ex)
             {
                 log.error(ex.getMessage(), ex);
@@ -227,6 +236,7 @@ public class IdentifierServiceImpl implements IdentifierService {
                 log.error(e.getMessage(),e);
             }
         }
+       dso.resetIdentifiersCache();
     }
 
     @Override
@@ -243,5 +253,6 @@ public class IdentifierServiceImpl implements IdentifierService {
                 log.error(e.getMessage(),e);
             }
         }
+        dso.resetIdentifiersCache();
     }
 }

dspace-api/src/main/java/org/dspace/versioning/VersioningConsumer.java

@@ -57,7 +57,7 @@ public class VersioningConsumer implements Consumer {
                             //and browse index we need to fire a new event
                             ctx.addEvent(new Event(Event.MODIFY, 
                                     previousItem.getType(), previousItem.getID(),
-                                    null, previousItem.lookupIdentifiers(ctx)));
+                                    null, previousItem.getIdentifiers(ctx)));
                         }
                     }
                 }