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85 lines
2.2 KiB
85 lines
2.2 KiB
14 years ago
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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(startOfPageElement != std::string::npos)
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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(startOfPageElement != std::string::npos)
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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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std::string & _pageContent;
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Object * _page;
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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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