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FilterChain.h

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00001 #ifndef TAGCOLL_FILTERCHAIN_H
00002 #define TAGCOLL_FILTERCHAIN_H
00003 
00004 /*
00005  * Chain more TagcollFilters together
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/TagcollFilter.h>
00028 
00029 namespace Tagcoll
00030 {
00031 
00032 // Tagcoll consumer that builds a chain of filters with a final consumer
00033 template<class ITEM, class TAG>
00034 class FilterChain : public TagcollConsumer<ITEM, TAG>
00035 {
00036 protected:
00037     TagcollConsumer<ITEM, TAG>* consumer;
00038     TagcollFilter<ITEM, TAG>* last;
00039 
00040 public:
00041     FilterChain<ITEM, TAG>() throw () : consumer(0), last(0) {}
00042 
00043     // Set the consumer at the end of the chain
00044     void setConsumer(TagcollConsumer<ITEM, TAG>* c) throw ();
00045 
00046     // Add a filter at the end of the chain
00047     void appendFilter(TagcollFilter<ITEM, TAG>* f) throw ();
00048 
00049     // Delete the filters in the chain (but not the consumer at the end)
00050     // This is a convenience method, since the FilterChain destructor does not
00051     // delete the filters in the chain
00052     void deleteFilters() throw ();
00053 
00054     // Consume data to be filtered
00055     virtual void consume(const ITEM& item) throw ();
00056     virtual void consume(const ITEM& item, const OpSet<TAG>& tags) throw ();
00057     virtual void consume(const OpSet<ITEM>& items) throw ();
00058     virtual void consume(const OpSet<ITEM>& items, const OpSet<TAG>& tags) throw ();
00059 };
00060 
00061 };
00062 
00063 // vim:set ts=4 sw=4:
00064 #endif

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