Consumer.h

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00001 #ifndef CONSUMER_H
00002 #define CONSUMER_H
00003 
00004 /*
00005  * Consumer and filter interfaces
00006  *
00007  * Copyright (C) 2003  Enrico Zini <enrico@debian.org>
00008  *
00009  * This program is free software; you can redistribute it and/or modify
00010  * it under the terms of the GNU General Public License as published by
00011  * the Free Software Foundation; either version 2 of the License, or
00012  * (at your option) any later version.
00013  *
00014  * This program 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
00017  * GNU General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU General Public License
00020  * along with this program; if not, write to the Free Software
00021  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022  */
00023 
00024 namespace buffy {
00025 
00026 template<class ITEM>
00027 class Consumer
00028 {
00029 public:
00030     virtual ~Consumer() {}
00031     virtual void consume(ITEM&) = 0;
00032 };
00033 
00034 template<class ITEM>
00035 class Matcher
00036 {
00037 public:
00038     virtual ~Matcher() {}
00039     virtual bool match(ITEM& item) const
00040     {
00041         return true;
00042     }
00043 };
00044 
00045 template<class ITEM>
00046 class Filter : public Consumer<ITEM>
00047 {
00048 protected:
00049     Consumer<ITEM>& next;
00050 public:
00051     Filter<ITEM>(Consumer<ITEM>& next) : next(next) {}
00052 
00053     virtual void consume(ITEM& item)
00054     {
00055         next.consume(item);
00056     }
00057 };
00058 
00059 template<class ITEM>
00060 class MatcherFilter : public Filter<ITEM>
00061 {
00062 protected:
00063     Matcher<ITEM>& matcher;
00064 
00065 public:
00066     MatcherFilter<ITEM>(Matcher<ITEM>& matcher, Consumer<ITEM>& next) throw ()
00067         : Filter<ITEM>(next), matcher(matcher) {}
00068 
00069     virtual void consume(ITEM& item)
00070     {
00071         if (matcher.match(item))
00072             this->next.consume(item);
00073     }
00074 };
00075 
00076 }
00077 
00078 // vim:set ts=4 sw=4:
00079 #endif

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