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Changes.h

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00001 #ifndef TAGCOLL_CHANGES_H
00002 #define TAGCOLL_CHANGES_H
00003 
00004 /*
00005  * Represent a list of tag substitutions to apply as a TagcollFilter
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 #include <map>
00030 #include <string>
00031 
00032 namespace Tagcoll
00033 {
00034 
00035 // List of changes to apply to tag names with a tagged collection is being
00036 // parsed
00037 class ChangeList : public TagcollConsumer<std::string>
00038 {
00039 protected:
00040     typedef std::map<std::string, std::string> changes_t;
00041     changes_t changes;
00042     
00043 public:
00044     virtual ~ChangeList() throw () {}
00045 
00046     virtual void consume(const std::string& item) throw () {}
00047     virtual void consume(const std::string& item, const OpSet<std::string>& tags) throw ();
00048     
00049     // Change a single tag
00050     std::string change(const std::string& tag) const throw ();
00051 
00052     // Change all the tags in a tag set
00053     OpSet<std::string> change(const OpSet<std::string>& tags) const throw ();
00054 };
00055 
00056 class ApplyChanges : public TagcollFilter<std::string>
00057 {
00058 protected:
00059     ChangeList& changes;
00060     
00061 public:
00062     ApplyChanges(ChangeList& changes) throw ()
00063         : changes(changes) {}
00064 
00065     virtual void consume(const std::string& item) throw ()
00066     {
00067         consumer->consume(changes.change(item));
00068     }
00069 
00070     virtual void consume(const std::string& item, const OpSet<std::string>& tags) throw ()
00071     {
00072         consumer->consume(item, changes.change(tags));
00073     }
00074 };
00075 
00076 };
00077 
00078 // vim:set ts=4 sw=4:
00079 #endif

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