/*

 Copyright (c) 2008 Health Market Science, Inc.

 This library is free software; you can redistribute it and/or

 modify it under the terms of the GNU Lesser General Public

 License as published by the Free Software Foundation; either

 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,

 but WITHOUT ANY WARRANTY; without even the implied warranty of

 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public

 License along with this library; if not, write to the Free Software

 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307

 USA

 You can contact Health Market Science at info@healthmarketscience.com

 or at the following address:

 Health Market Science

 2700 Horizon Drive

 Suite 200

 King of Prussia, PA 19406

 */

 package com.healthmarketscience.jackcess;

 import java.io.IOException;

 /**

  * Implementation of an Access table index which supports large indexes.

  * @author James Ahlborn

  */

 public class BigIndex extends Index {

   /** Cache which manages the index pages */

   private final IndexPageCache _pageCache;

   public BigIndex(Table table, int uniqueEntryCount,

                   int uniqueEntryCountOffset) {

     super(table, uniqueEntryCount, uniqueEntryCountOffset);

     _pageCache = new IndexPageCache(this);

   }

   @Override

   protected void updateImpl() throws IOException {

     _pageCache.write();

   }

   @Override

   protected void readIndexEntries()

     throws IOException

   {

     _pageCache.setRootPageNumber(getRootPageNumber());

   }

   @Override

   protected DataPage findDataPage(Entry entry)

     throws IOException

   {

     return _pageCache.findCacheDataPage(entry);

   }

   @Override

   protected DataPage getDataPage(int pageNumber)

     throws IOException

   {

     return _pageCache.getCacheDataPage(pageNumber);

   }

   @Override

   public String toString() {

     return super.toString() + "\n" + _pageCache.toString();

   }

   /**

    * Used by unit tests to validate the internal status of the index.

    */

   void validate() throws IOException {

     _pageCache.validate();

   }

 }