Main Page | Namespace List | Class Hierarchy | Class List | Directories | File List | Namespace Members | Class Members | File Members

TagConsumer.h

Go to the documentation of this file.
00001 #ifndef TAGCOLL_TAGCONSUMER_H
00002 #define TAGCOLL_TAGCONSUMER_H
00003 
00004 /*
00005  * Package stream 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 //#pragma interface
00025 
00026 namespace Tagcoll
00027 {
00028 
00029 template<class ITEM>
00030 class Consumer
00031 {
00032 public:
00033     virtual void consume(const ITEM&) throw () = 0;
00034 };
00035 
00036 template<class ITEM>
00037 class Matcher
00038 {
00039 public:
00040     virtual bool match(const ITEM& item) const throw ()
00041     {
00042         return true;
00043     }
00044 };
00045 
00046 template<class ITEM>
00047 class Filter : public Consumer<ITEM>
00048 {
00049 protected:
00050     Consumer<ITEM>& next;
00051 public:
00052     Filter<ITEM>(Consumer<ITEM>& next) throw () : next(next) {}
00053 
00054     virtual void consume(const ITEM& item) throw ()
00055     {
00056         next.consume(item);
00057     }
00058 };
00059 
00060 template<class ITEM>
00061 class MatcherFilter : public Filter<ITEM>
00062 {
00063 protected:
00064     Matcher<ITEM>& matcher;
00065 
00066 public:
00067     MatcherFilter<ITEM>(Matcher<ITEM>& matcher, Consumer<ITEM>& next) throw ()
00068         : Filter<ITEM>(next), matcher(matcher) {}
00069 
00070     virtual void consume(const ITEM& item) throw ()
00071     {
00072         if (matcher.match(item))
00073             next.consume(item);
00074     }
00075 };
00076 
00077 
00078 class Facet;
00079 class Tag;
00080 
00081 class FacetConsumer : public Consumer<Facet> {};
00082 class TagConsumer : public Consumer<Tag> {};
00083 
00084 class FacetMatcher : public Matcher<Facet> {};
00085 class TagMatcher : public Matcher<Tag> {};
00086 
00087 class FacetFilter : public Filter<Facet>
00088 {
00089 public:
00090     FacetFilter(FacetConsumer& next) throw () : Filter<Facet>(next) {}
00091 };
00092 class TagFilter : public Filter<Tag>
00093 {
00094 public:
00095     TagFilter(TagConsumer& next) throw () : Filter<Tag>(next) {}
00096 };
00097 
00098 class FacetMatcherFilter : public MatcherFilter<Facet>
00099 {
00100 public:
00101     FacetMatcherFilter(FacetMatcher& matcher, FacetConsumer& next) throw ()
00102         : MatcherFilter<Facet>(matcher, next) {}
00103 };
00104 
00105 class TagMatcherFilter : public MatcherFilter<Tag>
00106 {
00107 public:
00108     TagMatcherFilter(TagMatcher& matcher, TagConsumer& next) throw ()
00109         : MatcherFilter<Tag>(matcher, next) {}
00110 };
00111 
00112 };
00113 
00114 // vim:set ts=4 sw=4:
00115 #endif

Generated on Wed Nov 17 19:45:59 2004 for libtagcoll by  doxygen 1.3.9.1