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ItemGrouper.h

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00001 #ifndef TAGCOLL_ITEM_GROUPER_H
00002 #define TAGCOLL_ITEM_GROUPER_H
00003 
00004 /*
00005  * Group items having the same tagset
00006  *
00007  * Copyright (C) 2003  Enrico Zini <enrico@debian.org>
00008  *
00009  * This library is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  *
00014  * This library is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017  * Lesser General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with this library; if not, write to the Free Software
00021  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
00022  */
00023 
00024 #pragma interface
00025 
00026 #include <tagcoll/TagcollConsumer.h>
00027 #include <tagcoll/OpSet.h>
00028 
00029 #include <map>
00030 #include <string>
00031 
00032 namespace Tagcoll
00033 {
00034 
00035 template<class ITEM, class TAG>
00036 class ItemGrouper : public TagcollConsumer<ITEM, TAG>
00037 {
00038 protected:
00039     // tagset -> item group
00040     std::map<OpSet<TAG>, OpSet<ITEM> > groups;
00041     
00042 public:
00043     virtual ~ItemGrouper() throw () {}
00044 
00045     virtual void consume(const ITEM& item) throw ()
00046     {
00047         groups[OpSet<TAG>()] += item;
00048     }
00049 
00050     virtual void consume(const ITEM& item, const OpSet<TAG>& tags) throw ()
00051     {
00052         groups[tags] += item;
00053     }
00054 
00055     virtual void consume(const OpSet<ITEM>& items) throw ()
00056     {
00057         groups[OpSet<TAG>()] += items;
00058     }
00059 
00060     virtual void consume(const OpSet<ITEM>& items, const OpSet<TAG>& tags) throw ()
00061     {
00062         groups[tags] += items;
00063     }
00064 
00065     // Send the reversed data to a consumer
00066     void output(TagcollConsumer<ITEM, TAG>& consumer) throw ();
00067 };
00068 
00069 };
00070 
00071 // vim:set ts=4 sw=4:
00072 #endif

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