it_bus_pdk/qname_persistence_handler.h

#ifndef _IT_BUS_QNAME_PERSISTENCE_HANDLER_H_
#define _IT_BUS_QNAME_PERSISTENCE_HANDLER_H_

// @Copyright 2005 IONA Technologies, Plc. All Rights Reserved.
//
// This class handles persistence and serialization for QNames.

#include <it_bus/qname.h>
#include <it_bus/to_string.h>
#include <it_bus/from_string.h>

namespace IT_Bus
{
    class QNamePersistenceHandler       
    {
      public:

        IT_EXPLICIT QNamePersistenceHandler(
            const QName& qname
        ) :
            m_qname(IT_CONST_CAST(QName&, qname)),
            m_buf(0),
            m_size(0)
        {
            qname_to_string();
        }

        IT_EXPLICIT QNamePersistenceHandler(
            QName& qname
        ) :
            m_qname(qname),
            m_buf(0),
            m_size(0)
        {
            qname_to_string();
        }
        
        ~QNamePersistenceHandler()
        {
            if (m_buf != 0)
            {
                char* p = IT_STATIC_CAST(char*, m_buf);
                delete [] p;
            }
        }

        void*&
        writebuf()
        {
            return m_buf;
        }    

        void*
        readbuf()
        {
            qname_to_string();
            const void* p = m_qname_str.c_str();
            return IT_CONST_CAST(void*, p);
        }    

        IT_ULong&
        writebuflen()
        {
            return m_size;
        }

        IT_ULong
        readbuflen() const
        {
            return m_qname_str.length() + 1;
        }

        AllocFunc
        allocator()
        {
            return operator new;
        }

        void
        update_read_buffer_after_write()
        {
            if (m_buf != 0)
            {
                char* p = IT_STATIC_CAST(char*, m_buf);
                m_qname_str = p;                
                qname_from_string();
                operator delete(p);
                m_buf = 0;
            }
        }

      private:

        void
        qname_from_string()
        {           
            size_t pos      = m_qname_str.find("}");
            size_t length   = m_qname_str.length();

            if (pos != -1 && pos > 1 && m_qname_str.find("{") == 0 && pos+1 < length)
            {
                String namespace_str = m_qname_str.substr(1, pos-1);
                String localpart_str = m_qname_str.substr(pos+1, length-1); 
                m_qname = QName("", localpart_str, namespace_str);
            }       
        }

        void
        qname_to_string()
        {        
            m_qname_str =  "{";
            m_qname_str += m_qname.get_namespace_uri();
            m_qname_str += "}";
            m_qname_str += m_qname.get_local_part();        
        }

        QName&      m_qname;
        String      m_qname_str;
        void*       m_buf;
        IT_ULong    m_size;
    };
}

#endif  

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