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/** \file
 * Fast index for tag data

 * Copyright (C) 2005  Enrico Zini <enrico@debian.org>
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#include <tagcoll/Collection.h>
#include <tagcoll/Serializer.h>
#include <tagcoll/Exception.h>
#include <map>

namespace Tagcoll

 * In-memory collection whose representation is organised similarly to the
 * on-disk representation used by TDBDiskIndex.
 * It can be used as a working collection, and it can also write its contents
 * into an on-disk index that can later be used by TDBDiskIndex.
 * On-disk indexes produced by TDBIndexer are written in a single, optimised
 * run and tend to be more compact than the ones created by TDBDiskIndex.
template<class ITEM, class TAG>
00045 class TDBIndexer : public Collection<ITEM, TAG>
      std::map<ITEM, OpSet<TAG> > items;
      std::map<TAG, OpSet<ITEM> > tags;

      virtual void consumeItem(const ITEM& item, const OpSet<TAG>& tags);
      virtual void consumeItems(const OpSet<ITEM>& items, const OpSet<TAG>& tags);

      virtual OpSet<ITEM> getItemsHavingTag(const TAG& tag) const;
      virtual OpSet<TAG> getTagsOfItem(const ITEM& item) const;

      virtual ~TDBIndexer() {}

    virtual bool hasItem(const ITEM& item) const { return items.find(item) != items.end(); }
00061     virtual bool hasTag(const TAG& tag) const { return tags.find(tag) != tags.end(); }
      virtual OpSet<ITEM> getTaggedItems() const;
      virtual OpSet<TAG> getAllTags() const;
      virtual void output(Consumer<ITEM, TAG>& consumer) const;
      virtual void applyChange(const PatchList<ITEM, TAG>& change);

       * Write all collected informations to a disk index
       * \param itemconv
       *   Converter than can convert an ITEM to a string
       * \param tagconv
       *   Converter than can convert a TAG to a string
       * \param pkgidx
       *   File name for the package index to write
       * \param tagidx
       *   File name for the tag index to write
      void writeIndex(
                  Converter<ITEM, std::string>& itemconv,
                  Converter<TAG, std::string>& tagconv,
                  const std::string& pkgidx,
                  const std::string& tagidx) const;


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