filtrmgr.h

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// $Id: filtrmgr.h 1282 2006-06-09 09:46:49Z alex $
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=================================XARAHEADEREND============================
 */
//

#ifndef INC_FILTRMGR
#define INC_FILTRMGR

#include "ccarray.h"
//#include "list.h" - in camtypes.h [AUTOMATICALLY REMOVED]

typedef UINT32 FileFormatID;

class Filter;
/**************************************************************************************

>   class FilterList : public List

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    Today
    Purpose:    Take out some of the functionality from filters

**************************************************************************************/
class FilterList : public List
{
    CC_DECLARE_MEMDUMP(FilterList)
public:
    FilterList();

    BOOL AddFilter(Filter* const pFilter, const UINT32 ID);
};


class FileFormat;
class FormatEntry;
class FilterEntry;
class FilterList;
class FilterSearchCriteria;

class FormatArray : public CCArray<FormatEntry*, FormatEntry*&>
{
};

class FileFormat;
/**************************************************************************************

>   class FilterManager : public CC_CLASS_MEMDUMP

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    Today
    Purpose:    Take out some of the functionality from filters

**************************************************************************************/
class FilterManager : public CC_CLASS_MEMDUMP
{
    // Declare the class for memory tracking
    CC_DECLARE_MEMDUMP(FilterManager);

public:
    FilterManager();

    BOOL Init();
    INT32 DeInit();

    // Registering functions
    // What to do with filters, formats & families at the end of the day
    enum DESTRUCTION_METHOD
    {
        DM_INVALID          = 0,    // don't use this, it's for catching duff initialization
        DM_DELETE_WHEN_DONE = 1,
        DM_KEEP_WHEN_DONE
    };

    UINT32          RegisterFilter( Filter* const pFilter, 
                                    const DESTRUCTION_METHOD DestructMethod);
    FileFormatID    RegisterFileFormat( FileFormat* const pFormat, 
                                        const DESTRUCTION_METHOD DestructMethod);

    // Aggregation functions
    BOOL    AssociateFilterWithFormat(  const UINT32 FilterID, 
                                        const FileFormatID FileFormatID);

    // Search functions
    // Filters...
    Filter* FindFilterFromID(const UINT32 FilterID) const;

    Filter* FindFilter(FilterSearchCriteria& Criteria) const;
    FilterList* ListMatchingFilters(FilterSearchCriteria& Criteria);

    // FileFormats...
    FileFormat*     FindFormatFromID(const FileFormatID FormatID) const;
    FileFormat*     FindFormatFromName(const StringBase& FormatName) const;
    FileFormatID    FindFormatIDFromName(const StringBase& Name) const;

protected:
    List&               GetFilters() const;
    const UINT32            FILTERID_START;
    UINT32              GetNewFilterID();

    FormatArray&        GetFormats();
    const FormatArray&  GetFormats() const  {   return m_Formats;   }
    const FileFormatID  FORMATID_START;
    FileFormatID        GetNewFormatID();
    FileFormatID        GetLastFormatID() const {   return m_NextFormatID - 1;  }

    // And for searching
    FormatEntry*    FindFormatEntryFromID(const FileFormatID FormatID) const;
    FormatEntry*    FindFormatEntryFromName(const StringBase& FormatName) const;

private:
    // Lists of things the filter manager works with
    UINT32          m_NextFilterID;

    FormatArray     m_Formats;
    FileFormatID    m_NextFormatID;
};


/********************************************************************************************

>   class FilterEntry : public ListItem

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com> (from Tim)
    Created:    28/03/94
    Purpose:    A simple ListItem derived class to allow a list of filters to be
                maintained - the list holds all the filters that claim to understand a
                particular file (see FilterFamily).
                It is not derived from the Filter class itself because although the Filter 
                class is derived from ListItem too, we want to store a list of pointers to 
                existing filters, rather than actual instances of the Filter class.
                For each entry, a 'compatibility rating' is held, to allow the 
                FilterFamily class (the client of this class) to choose the most
                compatible filter from the list.
    SeeAlso:    CompatibleFilterList; Filter; ListItem

********************************************************************************************/
class FilterEntry : public ListItem
{
    CC_DECLARE_MEMDUMP(FilterEntry)

public:
    FilterEntry(Filter* const pFilter, const UINT32 ID);

protected:
    // Compatibility rating for this filter.
    Filter*     m_pFilter;
    UINT32      m_FilterID;

};

/********************************************************************************************

>   class FormatEntry : protected CC_CLASS_MEMDUMP

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    28/11/96
    Purpose:    A simple ListItem derived class to allow a list of filters to be
                maintained
    SeeAlso:    FilterList
    Scope:      private to FilterManager

********************************************************************************************/
class FilterManager;

class FormatEntry : public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(FormatEntry)

public:
    FormatEntry(const FileFormatID ID, FileFormat* const pFormat, 
                const FilterManager::DESTRUCTION_METHOD DestructMethod);

    ~FormatEntry();

    FileFormat*         GetFormat() const               { return m_pFormat; }
    FileFormatID        GetID() const                   { return m_FormatID;    }
    FilterList&         GetFilters()                    { return m_AssociatedFilters;   }

    FilterManager::DESTRUCTION_METHOD   GetDestructionMethod() const 
                                                        { return m_DestructMethod;  }

protected:

    FileFormat*         m_pFormat;              // Pointer to the format in question.
    FileFormatID        m_FormatID;             // and it's ID
    FilterList          m_AssociatedFilters;    // A list of filters that think they can cope

    // What to do with the format at the end...
    FilterManager::DESTRUCTION_METHOD   m_DestructMethod;   
};


#endif  // INC_FILTRMGR

---