libreoffice/dbaccess/source/core/inc/composertools.hxx

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#ifndef DBACCESS_SOURCE_CORE_INC_COMPOSERTOOLS_HXX
#define DBACCESS_SOURCE_CORE_INC_COMPOSERTOOLS_HXX

/** === begin UNO includes === **/
/** === end UNO includes === **/

#include <rtl/ustrbuf.hxx>

#include <functional>

namespace dbaccess
{

    //====================================================================
    //= TokenComposer
    //====================================================================
    struct TokenComposer : public ::std::unary_function< ::rtl::OUString, void >
    {
    private:
        #ifdef DBG_UTIL
        bool                    m_bUsed;
        #endif

    protected:
        ::rtl::OUStringBuffer   m_aBuffer;

    public:
        ::rtl::OUString getComposedAndClear()
        {
            #ifdef DBG_UTIL
            m_bUsed = true;
            #endif
            return m_aBuffer.makeStringAndClear();
        }

        void clear()
        {
            #ifdef DBG_UTIL
            m_bUsed = false;
            #endif
            m_aBuffer.makeStringAndClear();
        }

    public:
        TokenComposer()
        #ifdef DBG_UTIL
            :m_bUsed( false )
        #endif
        {
        }

        virtual ~TokenComposer()
        {
        }

        void operator() (const ::rtl::OUString& lhs)
        {
            append(lhs);
        }

        void append( const ::rtl::OUString& lhs )
        {
            #ifdef DBG_UTIL
            OSL_ENSURE( !m_bUsed, "FilterCreator::append: already used up!" );
            #endif
            if ( lhs.getLength() )
            {
                if ( m_aBuffer.getLength() )
                    appendNonEmptyToNonEmpty( lhs );
                else
                    m_aBuffer.append( lhs );
            }
        }

        /// append the given part. Only to be called when both the part and our buffer so far are not empty
        virtual void appendNonEmptyToNonEmpty( const ::rtl::OUString& lhs ) = 0;
    };

    //====================================================================
    //= FilterCreator
    //====================================================================
    struct FilterCreator : public TokenComposer
    {
        virtual void appendNonEmptyToNonEmpty( const ::rtl::OUString& lhs )
        {
            m_aBuffer.insert( 0, (sal_Unicode)' ' );
            m_aBuffer.insert( 0, (sal_Unicode)'(' );
            m_aBuffer.appendAscii( " ) AND ( " );
            m_aBuffer.append( lhs );
            m_aBuffer.appendAscii( " )" );
        }
    };

    //====================================================================
    //= FilterCreator
    //====================================================================
    struct OrderCreator : public TokenComposer
    {
        virtual void appendNonEmptyToNonEmpty( const ::rtl::OUString& lhs )
        {
            m_aBuffer.appendAscii( ", " );
            m_aBuffer.append( lhs );
        }
    };

} // namespace dbaccess

#endif // DBACCESS_SOURCE_CORE_INC_COMPOSERTOOLS_HXX