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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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#if ! defined INCLUDED_DP_BACKENDDB_HXX
#define INCLUDED_DP_BACKENDDB_HXX

#include "rtl/ustring.hxx"
#include <list>
#include <vector>

namespace css = ::com::sun::star;

namespace com { namespace sun { namespace star {
        namespace uno {
        class XComponentContext;
        }
        namespace xml { namespace dom {
            class XDocument;
            class XNode;
        }}
        namespace xml { namespace xpath {
            class XXPathAPI;
        }}
}}}

namespace dp_registry {
namespace backend {

class BackendDb
{
private:

    css::uno::Reference<css::xml::dom::XDocument> m_doc;
    css::uno::Reference<css::xml::xpath::XXPathAPI> m_xpathApi;

    BackendDb(BackendDb const &);
    BackendDb &  operator = (BackendDb const &);

protected:
    const css::uno::Reference<css::uno::XComponentContext> m_xContext;
    ::rtl::OUString m_urlDb;

protected:

    /* caller must make sure that only one thread accesses the function
     */
    css::uno::Reference<css::xml::dom::XDocument> getDocument();

    /* the namespace prefix is "reg" (without quotes)
     */
    css::uno::Reference<css::xml::xpath::XXPathAPI> getXPathAPI();
    void save();
    void removeElement(::rtl::OUString const & sXPathExpression);

    css::uno::Reference<css::xml::dom::XNode> getKeyElement(
        ::rtl::OUString const & url);

    void writeSimpleList(
        ::std::list< ::rtl::OUString> const & list,
        ::rtl::OUString const & sListTagName,
        ::rtl::OUString const & sMemberTagName,
        css::uno::Reference<css::xml::dom::XNode> const & xParent);

    void writeVectorOfPair(
        ::std::vector< ::std::pair< ::rtl::OUString, ::rtl::OUString > > const & vecPairs,
        ::rtl::OUString const & sVectorTagName,
        ::rtl::OUString const & sPairTagName,
        ::rtl::OUString const & sFirstTagName,
        ::rtl::OUString const & sSecondTagName,
        css::uno::Reference<css::xml::dom::XNode> const & xParent);

    void writeSimpleElement(
        ::rtl::OUString const & sElementName, ::rtl::OUString const & value,
        css::uno::Reference<css::xml::dom::XNode> const & xParent);

    css::uno::Reference<css::xml::dom::XNode> writeKeyElement(
        ::rtl::OUString const & url);

    ::rtl::OUString readSimpleElement(
        ::rtl::OUString const & sElementName,
        css::uno::Reference<css::xml::dom::XNode> const & xParent);

    ::std::vector< ::std::pair< ::rtl::OUString, ::rtl::OUString > >
    readVectorOfPair(
        css::uno::Reference<css::xml::dom::XNode> const & parent,
        ::rtl::OUString const & sListTagName,
        ::rtl::OUString const & sPairTagName,
        ::rtl::OUString const & sFirstTagName,
        ::rtl::OUString const & sSecondTagName);

    ::std::list< ::rtl::OUString> readList(
        css::uno::Reference<css::xml::dom::XNode> const & parent,
        ::rtl::OUString const & sListTagName,
        ::rtl::OUString const & sMemberTagName);

    /* returns the values of one particulary child element of all key elements.
     */
    ::std::list< ::rtl::OUString> getOneChildFromAllEntries(
        ::rtl::OUString const & sElementName);


    /*  returns the namespace which is to be written as xmlns attribute
        into the root element.
     */
    virtual ::rtl::OUString getDbNSName()=0;
    /* return the namespace prefix which is to be registered with the XPath API.

       The prefix can then be used in XPath expressions.
    */
    virtual ::rtl::OUString getNSPrefix()=0;
    /* returns the name of the root element without any namespace prefix.
     */
    virtual ::rtl::OUString getRootElementName()=0;
    /* returns the name of xml element for each entry
     */
    virtual ::rtl::OUString getKeyElementName()=0;



public:
    BackendDb(css::uno::Reference<css::uno::XComponentContext> const &  xContext,
              ::rtl::OUString const & url);
    virtual ~BackendDb() {};

    void removeEntry(::rtl::OUString const & url);
};

class RegisteredDb: public BackendDb
{

public:
    RegisteredDb( css::uno::Reference<css::uno::XComponentContext> const &  xContext,
                  ::rtl::OUString const & url);
    virtual ~RegisteredDb() {};


    virtual void addEntry(::rtl::OUString const & url);
    virtual bool getEntry(::rtl::OUString const & url);

};


}
}
#endif