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113 lines
3.2 KiB
113 lines
3.2 KiB
/*
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* Copyright (C) 2015-2022 Département de l'Instruction Publique (DIP-SEM)
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*
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* Copyright (C) 2013 Open Education Foundation
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*
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* Copyright (C) 2010-2013 Groupement d'Intérêt Public pour
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* l'Education Numérique en Afrique (GIP ENA)
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*
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* This file is part of OpenBoard.
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*
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* OpenBoard is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License,
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* with a specific linking exception for the OpenSSL project's
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* "OpenSSL" library (or with modified versions of it that use the
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* same license as the "OpenSSL" library).
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*
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* OpenBoard is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenBoard. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined PageElementHandler_h
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#define PageElementHandler_h
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#include <string>
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#include <set>
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#include "Object.h"
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#include "Parser.h"
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namespace merge_lib
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{
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//base class for all elements handlers
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//Handlers are needed to process Page fields during the merge
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//this is the chain of responsibility pattern
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class PageElementHandler
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{
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public:
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PageElementHandler(Object * page): _page(page), _pageContent(page->_content), _nextHandler(0)
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{
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_createAllPageFieldsSet();
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}
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virtual ~PageElementHandler()
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{
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delete _nextHandler;
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}
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void addNextHandler(PageElementHandler * nextHandler)
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{
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_nextHandler = nextHandler;
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}
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void processObjectContent()
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{
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unsigned int startOfPageElement = _findStartOfPageElement();
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if((int)startOfPageElement != -1)
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_processObjectContent(startOfPageElement);
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if(_nextHandler)
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_nextHandler->processObjectContent();
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}
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void changeObjectContent()
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{
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unsigned int startOfPageElement = _findStartOfPageElement();
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if((int)startOfPageElement != -1)
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_changeObjectContent(startOfPageElement);
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else
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_pageElementNotFound();
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if(_nextHandler)
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_nextHandler->changeObjectContent();
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}
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protected:
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//methods
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void _setHandlerName(const std::string & handlerName)
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{
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_handlerName = handlerName;
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}
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unsigned int _findEndOfElementContent(unsigned int startOfPageElement);
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void _createAllPageFieldsSet();
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//members
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Object * _page;
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std::string & _pageContent;
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std::string _handlerName;
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PageElementHandler * _nextHandler;
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private:
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//methods
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virtual void _processObjectContent(unsigned int startOfPageElement);
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virtual void _changeObjectContent(unsigned int startOfPageElement) = 0;
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virtual void _pageElementNotFound() {};
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unsigned int _findStartOfPageElement()
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{
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return Parser::findToken(_pageContent,_handlerName);
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}
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//members
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static std::set<std::string> _allPageFields;
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};
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}
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#endif
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