The Tor Browser / file revision

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 package org.mozilla.gecko.sync.repositories;

 import java.util.HashSet;

 import java.util.Iterator;

 import org.mozilla.gecko.sync.repositories.domain.Record;

 public class HashSetStoreTracker implements StoreTracker {

   // Guarded by `this`.

   // Used to store GUIDs that were not locally modified but

   // have been modified by a call to `store`, and thus

   // should not be returned by a subsequent fetch.

   private HashSet<String> guids;

   public HashSetStoreTracker() {

     guids = new HashSet<String>();

   }

   @Override

   public String toString() {

     return "#<Tracker: " + guids.size() + " guids tracked.>";

   }

   @Override

   public synchronized boolean trackRecordForExclusion(String guid) {

     return (guid != null) && guids.add(guid);

   }

   @Override

   public synchronized boolean isTrackedForExclusion(String guid) {

     return (guid != null) && guids.contains(guid);

   }

   @Override

   public synchronized boolean untrackStoredForExclusion(String guid) {

     return (guid != null) && guids.remove(guid);

   }

   @Override

   public RecordFilter getFilter() {

     if (guids.size() == 0) {

       return null;

     }

     return new RecordFilter() {

       @Override

       public boolean excludeRecord(Record r) {

         return isTrackedForExclusion(r.guid);

       }

     };

   }

   @Override

   public Iterator<String> recordsTrackedForExclusion() {

     return this.guids.iterator();

   }

 }