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#ifndef _BASEHANDLER_H
#define _BASEHANDLER_H
#include <qxml.h>
#include <qdict.h>
#include <qstring.h>
class IBaseHandler
{
public:
virtual void setDelegate(QXmlDefaultHandler *delegate) = 0;
virtual QXmlDefaultHandler *delegate() const = 0;
};
class IFallBackHandler
{
public:
virtual bool handleStartElement(const QString & name,
const QXmlAttributes & attrib) = 0;
virtual bool handleEndElement(const QString &name) = 0;
};
template<class T> class ElementMapper
{
class StartElementHandler
{
typedef void (T::*Handler)(const QXmlAttributes &attrib);
public:
StartElementHandler() : m_parent(0) {}
StartElementHandler(T *parent, Handler h)
: m_parent(parent), m_handler(h) {}
void operator()(const QXmlAttributes &attrib)
{ if (m_parent) (m_parent->*m_handler)(attrib); }
private:
T *m_parent;
Handler m_handler;
};
class EndElementHandler
{
typedef void (T::*Handler)();
public:
EndElementHandler() : m_parent(0) {}
EndElementHandler(T *parent, Handler h)
: m_parent(parent), m_handler(h) {}
void operator()()
{ if (m_parent) (m_parent->*m_handler)(); }
private:
T *m_parent;
Handler m_handler;
};
typedef StartElementHandler<T> StartElementHandlerT;
typedef EndElementHandler<T> EndElementHandlerT;
public:
ElementMapper() : m_startHandlers(67), m_endHandlers(67)
{
m_startHandlers.setAutoDelete(TRUE);
m_endHandlers.setAutoDelete(TRUE);
}
virtual ~ElementMapper()
{
}
void addStartHandler(const char *key)
{
m_startHandlers.insert(key,new StartElementHandlerT);
}
void addStartHandler(const char *key, T *obj, void (T::*handler)(const QXmlAttributes &))
{
m_startHandlers.insert(key,new StartElementHandlerT(obj,handler));
}
void addEndHandler(const char *key)
{
m_endHandlers.insert(key,new EndElementHandlerT);
}
void addEndHandler(const char *key, T *obj, void (T::*handler)())
{
m_endHandlers.insert(key,new EndElementHandlerT(obj,handler));
}
protected:
QDict<StartElementHandlerT> m_startHandlers;
QDict<EndElementHandlerT> m_endHandlers;
};
template<class T> class BaseHandler : public IBaseHandler,
public QXmlDefaultHandler,
public ElementMapper<T>
{
public:
BaseHandler() : m_delegateHandler(0), m_fallBackHandler(0)
{
}
virtual ~BaseHandler()
{
delete m_fallBackHandler;
}
virtual bool startDocument()
{
return TRUE;
}
virtual bool startElement( const QString & namespaceURI,
const QString & localName,
const QString & name,
const QXmlAttributes & attrib
)
{
if (m_delegateHandler)
{
return m_delegateHandler->startElement(namespaceURI,localName,name,attrib);
}
if (!m_skipUntil.isEmpty()) // skip mode
{
if (m_skipUntil==name) m_skipCount++;
printf("skipping start tag %s count=%d\n",name.data(),m_skipCount);
return TRUE;
}
StartElementHandlerT *handler = m_startHandlers[name];
if (handler)
{
(*handler)(attrib);
//printf("found start tag %s\n",name.data());
}
else if (m_fallBackHandler &&
!m_fallBackHandler->handleStartElement(name,attrib)
)
{
printf("found unexpected tag `%s', skipping until matching end tag\n",name.data());
m_skipUntil = name;
m_skipCount=1;
}
return TRUE;
}
virtual bool endElement( const QString& namespaceURI, const QString& localName, const QString& name )
{
if (m_delegateHandler)
{
return m_delegateHandler->endElement(namespaceURI,localName,name);
}
if (name==m_skipUntil)
{
m_skipCount--;
printf("skipping end tag %s count=%d\n",name.data(),m_skipCount);
if (m_skipCount==0)
{
m_skipUntil="";
}
//printf("found end tag %s\n",name.data());
}
else if (m_skipUntil.isEmpty())
{
EndElementHandlerT *handler = m_endHandlers[name];
if (handler)
{
(*handler)();
//printf("found end tag %s\n",name.data());
}
else if (m_fallBackHandler)
{
m_fallBackHandler->handleEndElement(name);
}
}
m_curString="";
return TRUE;
}
virtual bool characters ( const QString & ch )
{
if (m_delegateHandler)
{
return m_delegateHandler->characters(ch);
}
m_curString+=ch;
return TRUE;
}
void setDelegate(QXmlDefaultHandler *delegate)
{
m_delegateHandler = delegate;
}
QXmlDefaultHandler *delegate() const
{
return m_delegateHandler;
}
void setFallBackHandler(IFallBackHandler *h)
{
m_fallBackHandler = h;
}
IFallBackHandler *fallBackHandler() const
{
return m_fallBackHandler;
}
protected:
QString m_curString;
QString m_skipUntil;
int m_skipCount;
QXmlDefaultHandler *m_delegateHandler;
IFallBackHandler *m_fallBackHandler;
};
template<class T> class BaseFallBackHandler : public ElementMapper<T>,
public IFallBackHandler
{
public:
BaseFallBackHandler()
{
}
virtual ~BaseFallBackHandler()
{
}
bool handleStartElement(const QString & name,
const QXmlAttributes & attrib)
{
StartElementHandlerT *handler = m_startHandlers[name];
if (handler)
{
(*handler)(attrib);
return TRUE;
}
return FALSE;
}
bool handleEndElement(const QString &name)
{
EndElementHandlerT *handler = m_endHandlers[name];
if (handler)
{
(*handler)();
return TRUE;
}
return FALSE;
}
};
#endif
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