ie_exp.h

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/* -*- mode: C++; tab-width: 4; c-basic-offset: 4; -*- */

/* AbiWord
 * Copyright (C) 1998 AbiSource, Inc.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  
 * 02111-1307, USA.
 */

#ifndef IE_EXP_H
#define IE_EXP_H

#include <stdio.h>
#include <map>
#include <string>

#include "ie_types.h"

#include "ut_go_file.h"
#include <gsf/gsf-output.h>

#include "ut_string_class.h"

class PD_Document;
class PD_DocumentRange;
class UT_ByteBuf;

// IE_Exp defines the base class for file exporters.

class IE_Exp;
class IE_FieldUpdater;

class ABI_EXPORT IE_ExpSniffer
{
    friend class IE_Exp;

public:
    virtual ~IE_ExpSniffer();
    
    // these you get for free
    inline bool supportsFileType (IEFileType type) {return m_type == type;}
    inline IEFileType getFileType() const {return m_type;}
    
    // these you must override these
    virtual bool recognizeSuffix (const char * szSuffix) = 0;
    virtual bool getDlgLabels (const char ** szDesc,
                               const char ** szSuffixList,
                               IEFileType * ft) = 0;

    virtual UT_UTF8String getPreferredSuffix();

    virtual UT_Error constructExporter (PD_Document * pDocument,
                                        IE_Exp ** ppie) = 0;
    
    virtual UT_Confidence_t supportsMIME (const char * /*szMIME*/) { return UT_CONFIDENCE_ZILCH; }

    const UT_UTF8String & name () const { return m_name; }

    bool getCanCopy () const {
        return m_bCanCopy;
    }
    
protected:
    IE_ExpSniffer(const char * name, bool canCopy = false);

private:
    const UT_UTF8String m_name;

    // only IE_Exp ever calls this
    inline void setFileType (IEFileType type) {m_type = type;}
    IEFileType m_type;

    bool m_bCanCopy;
};

class ABI_EXPORT IE_Exp
{
public:
    // constructs an exporter of the right type based upon
    // either the filename or the key given.  caller is
    // responsible for destroying the exporter when finished
    // with it.

    static IEFileType   fileTypeForSuffix(const char * szSuffix);
    static IEFileType   fileTypeForMimetype(const char * szMimetype);
    static IEFileType   fileTypeForDescription(const char * szSuffix);
    static IEFileType fileTypeForSuffixes(const char * suffixList);
    static IE_ExpSniffer * snifferForFileType(IEFileType ieft);
    static const char * suffixesForFileType(IEFileType ieft);
    static const char * descriptionForFileType(IEFileType ieft);
    static UT_UTF8String preferredSuffixForFileType(IEFileType ieft);
    
    static UT_Error     constructExporter(PD_Document * pDocument,
                                          const char * szFilename,
                                          IEFileType ieft,
                                          IE_Exp ** ppie,
                                          IEFileType * pieft = NULL);
    static UT_Error     constructExporter(PD_Document * pDocument,
                                          GsfOutput * output,
                                          IEFileType ieft,
                                          IE_Exp ** ppie,
                                          IEFileType * pieft = NULL);
    static bool         enumerateDlgLabels(UT_uint32 ndx,
                                           const char ** pszDesc,
                                           const char ** pszSuffixList,
                                           IEFileType * ft);
    static UT_uint32    getExporterCount(void);

    static void registerExporter (IE_ExpSniffer *);
    static void unregisterExporter (IE_ExpSniffer *);
    static void unregisterAllExporters ();

    virtual ~IE_Exp();

    UT_Error        writeFile(const char * szFilename);
    UT_Error        writeFile(GsfOutput * fp);
    virtual UT_Error    copyToBuffer(PD_DocumentRange * pDocRange, UT_ByteBuf * pBuf);
    virtual void        write(const char * sz);
    virtual void        write(const char * sz, UT_uint32 length);
    virtual char        rewindChar(void);
    void write (const UT_String & inStr)
      {
        write ( inStr.c_str(), inStr.size() ) ;
      }

    virtual char *          getFileName(void) {return m_szFileName;}

    UT_Confidence_t getFidelity () const {
        return m_fidelity;
    }

    void setProps (const char * props);

    bool isCopying () const {
        return getDocRange () != NULL;
    }

    void populateFields();

protected:
    // todo: remove the = 0 for 2.2
    IE_Exp(PD_Document * pDocument, UT_Confidence_t fidelity = 0);
    virtual UT_Error    _writeDocument(void) = 0;
    
    GsfOutput*  openFile(const char * szFilename);

    virtual GsfOutput* _openFile(const char *szFilename);

    // derived classes should use these to open/close
    // and write data to the actual file.  this will
    // let us handle file backups, etc.
    virtual UT_uint32   _writeBytes(const UT_Byte * pBytes, UT_uint32 length);
    virtual bool        _writeBytes(const UT_Byte * sz);
    virtual void        _abortFile(void);

    void                _cancelExport () { m_bCancelled = true; }

    bool        _closeFile(void);

    PD_Document * getDoc() const;
    PD_DocumentRange * getDocRange() const;
    GsfOutput*          getFp()
        {
            return m_fp;
        }

    bool                m_error;
    void               _setByteBuf(UT_ByteBuf * pBuf)
    { m_pByteBuf = pBuf;}
    UT_ByteBuf *       _getByteBuf(void)
    { return m_pByteBuf;}

public:
    const std::string & getProperty (const std::string & key) {
        return m_props_map[key];
    }

private:
    PD_Document *       m_pDocument;
    PD_DocumentRange *  m_pDocRange;
    UT_ByteBuf *        m_pByteBuf;
    char *                  m_szFileName;
    GsfOutput *             m_fp;
    bool                m_bOwnsFp;

    bool                m_bCancelled;

    std::map<std::string, std::string>  m_props_map;

    UT_Confidence_t     m_fidelity;
    IE_FieldUpdater  *  m_fieldUpdater;
};


#endif /* IE_EXP_H */

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