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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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