/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org 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 Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

#include "filtergrouping.hxx"
#include <sfx2/fcontnr.hxx>
#include <sfx2/filedlghelper.hxx>
#include <sfx2/sfx.hrc>
#include <sfx2/docfac.hxx>
#include "sfx2/sfxresid.hxx"
#include <osl/thread.h>
#include <rtl/strbuf.hxx>
#include <com/sun/star/ui/dialogs/XFilterGroupManager.hpp>
#include <com/sun/star/beans/StringPair.hpp>
#include <com/sun/star/uno/Sequence.hxx>
#include <unotools/confignode.hxx>
#include <comphelper/processfactory.hxx>
#include <comphelper/sequenceashashmap.hxx>
#include <comphelper/string.hxx>
#include <tools/wldcrd.hxx>
#include <tools/diagnose_ex.h>

#include <list>
#include <vector>
#include <map>
#include <algorithm>

//........................................................................
namespace sfx2
{
//........................................................................

//#define DISABLE_GROUPING_AND_CLASSIFYING
    // not using the functionallity herein, yet

    using namespace ::com::sun::star::uno;
    using namespace ::com::sun::star::ui::dialogs;
    using namespace ::com::sun::star::lang;
    using namespace ::com::sun::star::beans;
    using namespace ::utl;

    //====================================================================
    /**

    Some general words about what's going on here ....

    <p>In our file open dialog, usually we display every filter we know. That's how it was before: every filter
    lead to an own line in the filter list box, e.g. "StarWriter 5.0 Dokument" or "Microsoft Word 97".</p>

    <p>But then the PM came. And everything changed ....</p>

    <p>A basic idea are groups: Why simply listing all the single filters? Couldn't we draw nice separators
    between the filters which logically belong together? I.e. all the filters which open a document in StarWriter:
    couldn't we separate them from all the filters which open the document in StarCalc?<br/>
    So spoke the PM, and engineering obeyed.</p>

    <p>So we have groups. They're just a visual aspect: All the filters of a group are presented together, separated
    by a line from other groups.</p>

    <p>Let's be honest: How the concrete implementation of the file picker service separates the different groups
    is a matter of this implementation. We only do this grouping and suggest it to the FilePicker service ...</p>

    <p>Now for the second concept:<br/>
    Thinking about it (and that's what the PM did), both "StarWriter 5.0 Dokument" and "Microsoft Word 97"
    describe a text document. It's a text. It's of no interest for the user that one of the texts was saved in
    MS' format, and one in our own format.<br/>
    So in a first step, we want to have a filter entry "Text documents". This would cover both above-mentioned
    filters, as well as any other filters for documents which are texts.</p>

    <p>Such an entry as "Text documents" is - within the scope of this file - called "class" or "filter class".</p>

    <p>In the file-open-dialog, such a class looks like an ordinary filter: it's simply a name in the filter
    listbox. Selecting means that all the files matching one of the "sub-filters" are displayed (in the example above,
    this would be "*.sdw", "*.doc" and so on).</p>

    <p>Now there are two types of filter classes: global ones and local ones. "Text documents" is a global class. As
    well as "Spreadsheets". Or "Web pages".<br/>
    Let's have a look at a local class: The filters "MS Word 95" and "MS WinWord 6.0" together form the class
    "Microsoft Word 6.0 / 95" (don't ask for the reasons. At least not me. Ask the PM). There are a lot of such
    local classes ...</p>

    <p>The difference between global and local classes is as follows: Global classes are presented in an own group.
    There is one dedicated group at the top of the list, containing all the global groups - no local groups and no
    single filters.</p>

    <p>Ehm - it was a lie. Not really at the top. Before this group, there is this single "All files" entry. It forms
    it's own group. But this is uninteresting here.</p>

    <p>Local classes must consist of filters which - without the classification - would all belong to the same group.
    Then, they're combined to one entry (in the example above: "Microsoft Word 6.0 / 95"), and this entry is inserted
    into the file picker filter list, instead of the single filters which form the class.</p>

    <p>This is an interesting difference between local and global classes: Filters which are part of a global class
    are listed in there own group, too. Filters in local classes aren't listed a second time - neither directly (as
    the filter itself) nor indirectly (as part of another local group).</p>

    <p>The only exception are filters which are part of a global class <em>and</em> a local class. This is allowed.
    Beeing cotained in two local classes isn't.</p>

    <p>So that's all what you need to know: Understand the concept of "filter classes" (a filter class combines
    different filters and acts as if it's a filter itself) and the concept of groups (a group just describes a
    logical correlation of filters and usually is represented to the user by drawing group separators in the filter
    list).</p>

    <p>If you got it, go try understanding this file :).</p>

    */


    //====================================================================

    typedef StringPair                          FilterDescriptor;   // a single filter or a filter class (display name and filter mask)
    typedef ::std::list< FilterDescriptor >     FilterGroup;        // a list of single filter entries
    typedef ::std::list< FilterGroup >          GroupedFilterList;  // a list of all filters, already grouped

    /// the logical name of a filter
    typedef ::rtl::OUString                     FilterName;

    // a struct which holds references from a logical filter name to a filter group entry
    // used for quick lookup of classes (means class entries - entries representing a class)
    // which a given filter may belong to
    typedef ::std::map< ::rtl::OUString, FilterGroup::iterator >    FilterGroupEntryReferrer;

    /// a descriptor for a filter class (which in the final dialog is represented by one filter entry)
    typedef struct _tagFilterClass
    {
        ::rtl::OUString             sDisplayName;       // the display name
        Sequence< FilterName >      aSubFilters;        // the (logical) names of the filter which belong to the class
    } FilterClass;

    typedef ::std::list< FilterClass >                                  FilterClassList;
    typedef ::std::map< ::rtl::OUString, FilterClassList::iterator >    FilterClassReferrer;

    typedef ::std::vector< ::rtl::OUString >                            StringArray;

// =======================================================================
// = reading of configuration data
// =======================================================================

    //--------------------------------------------------------------------
    void lcl_ReadFilterClass( const OConfigurationNode& _rClassesNode, const ::rtl::OUString& _rLogicalClassName,
        FilterClass& /* [out] */ _rClass )
    {
        static const ::rtl::OUString sDisplaNameNodeName( RTL_CONSTASCII_USTRINGPARAM( "DisplayName" ) );
        static const ::rtl::OUString sSubFiltersNodeName( RTL_CONSTASCII_USTRINGPARAM( "Filters" ) );

            // the description node for the current class
        OConfigurationNode aClassDesc = _rClassesNode.openNode( _rLogicalClassName );

        // the values
        aClassDesc.getNodeValue( sDisplaNameNodeName ) >>= _rClass.sDisplayName;
        aClassDesc.getNodeValue( sSubFiltersNodeName ) >>= _rClass.aSubFilters;
    }

    //--------------------------------------------------------------------
    struct CreateEmptyClassRememberPos : public ::std::unary_function< FilterName, void >
    {
    protected:
        FilterClassList&        m_rClassList;
        FilterClassReferrer&    m_rClassesReferrer;

    public:
        CreateEmptyClassRememberPos( FilterClassList& _rClassList, FilterClassReferrer& _rClassesReferrer )
            :m_rClassList       ( _rClassList )
            ,m_rClassesReferrer ( _rClassesReferrer )
        {
        }

        // operate on a single class name
        void operator() ( const FilterName& _rLogicalFilterName )
        {
            // insert a new (empty) class
            m_rClassList.push_back( FilterClass() );
            // get the position of this new entry
            FilterClassList::iterator aInsertPos = m_rClassList.end();
            --aInsertPos;
            // remember this position
            m_rClassesReferrer.insert( FilterClassReferrer::value_type( _rLogicalFilterName, aInsertPos ) );
        }
    };

    //--------------------------------------------------------------------
    struct ReadGlobalFilter : public ::std::unary_function< FilterName, void >
    {
    protected:
        OConfigurationNode      m_aClassesNode;
        FilterClassReferrer&    m_aClassReferrer;

    public:
        ReadGlobalFilter( const OConfigurationNode& _rClassesNode, FilterClassReferrer& _rClassesReferrer )
            :m_aClassesNode     ( _rClassesNode )
            ,m_aClassReferrer   ( _rClassesReferrer )
        {
        }

        // operate on a single logical name
        void operator() ( const FilterName& _rName )
        {
            FilterClassReferrer::iterator aClassRef = m_aClassReferrer.find( _rName );
            if ( m_aClassReferrer.end() == aClassRef )
            {
                // we do not know this global class
                OSL_FAIL( "ReadGlobalFilter::operator(): unknown filter name!" );
                // TODO: perhaps we should be more tolerant - at the moment, the filter is dropped
                // We could silently push_back it to the container ....
            }
            else
            {
                // read the data of this class into the node referred to by aClassRef
                lcl_ReadFilterClass( m_aClassesNode, _rName, *aClassRef->second );
            }
        }
    };

    //--------------------------------------------------------------------
    void lcl_ReadGlobalFilters( const OConfigurationNode& _rFilterClassification, FilterClassList& _rGlobalClasses, StringArray& _rGlobalClassNames )
    {
        _rGlobalClasses.clear();
        _rGlobalClassNames.clear();

        //================================================================
        // get the list describing the order of all global classes
        Sequence< ::rtl::OUString > aGlobalClasses;
        _rFilterClassification.getNodeValue( DEFINE_CONST_OUSTRING( "GlobalFilters/Order" ) ) >>= aGlobalClasses;

        const ::rtl::OUString* pNames = aGlobalClasses.getConstArray();
        const ::rtl::OUString* pNamesEnd = pNames + aGlobalClasses.getLength();

        // copy the logical names
        _rGlobalClassNames.resize( aGlobalClasses.getLength() );
        ::std::copy( pNames, pNamesEnd, _rGlobalClassNames.begin() );

        // Global classes are presented in an own group, so their order matters (while the order of the
        // "local classes" doesn't).
        // That's why we can't simply add the global classes to _rGlobalClasses using the order in which they
        // are returned from the configuration - it is completely undefined, and we need a _defined_ order.
        FilterClassReferrer aClassReferrer;
        ::std::for_each(
            pNames,
            pNamesEnd,
            CreateEmptyClassRememberPos( _rGlobalClasses, aClassReferrer )
        );
            // now _rGlobalClasses contains a dummy entry for each global class,
            // while aClassReferrer maps from the logical name of the class to the position within _rGlobalClasses where
            // it's dummy entry resides

        //================================================================
        // go for all the single class entries
        OConfigurationNode aFilterClassesNode =
            _rFilterClassification.openNode( DEFINE_CONST_OUSTRING( "GlobalFilters/Classes" ) );
        Sequence< ::rtl::OUString > aFilterClasses = aFilterClassesNode.getNodeNames();
        ::std::for_each(
            aFilterClasses.getConstArray(),
            aFilterClasses.getConstArray() + aFilterClasses.getLength(),
            ReadGlobalFilter( aFilterClassesNode, aClassReferrer )
        );
    }

    //--------------------------------------------------------------------
    struct ReadLocalFilter : public ::std::unary_function< FilterName, void >
    {
    protected:
        OConfigurationNode      m_aClassesNode;
        FilterClassList&        m_rClasses;

    public:
        ReadLocalFilter( const OConfigurationNode& _rClassesNode, FilterClassList& _rClasses )
            :m_aClassesNode ( _rClassesNode )
            ,m_rClasses     ( _rClasses )
        {
        }

        // operate on a single logical name
        void operator() ( const FilterName& _rName )
        {
            // read the data for this class
            FilterClass aClass;
            lcl_ReadFilterClass( m_aClassesNode, _rName, aClass );

            // insert the class descriptor
            m_rClasses.push_back( aClass );
        }
    };

    //--------------------------------------------------------------------
    void lcl_ReadLocalFilters( const OConfigurationNode& _rFilterClassification, FilterClassList& _rLocalClasses )
    {
        _rLocalClasses.clear();

        // the node for the local classes
        OConfigurationNode aFilterClassesNode =
            _rFilterClassification.openNode( DEFINE_CONST_OUSTRING( "LocalFilters/Classes" ) );
        Sequence< ::rtl::OUString > aFilterClasses = aFilterClassesNode.getNodeNames();

        ::std::for_each(
            aFilterClasses.getConstArray(),
            aFilterClasses.getConstArray() + aFilterClasses.getLength(),
            ReadLocalFilter( aFilterClassesNode, _rLocalClasses )
        );
    }

    //--------------------------------------------------------------------
    void lcl_ReadClassification( FilterClassList& _rGlobalClasses, StringArray& _rGlobalClassNames, FilterClassList& _rLocalClasses )
    {
        //================================================================
        // open our config node
        OConfigurationTreeRoot aFilterClassification = OConfigurationTreeRoot::createWithServiceFactory(
            ::comphelper::getProcessServiceFactory(),
            DEFINE_CONST_OUSTRING( "org.openoffice.Office.UI/FilterClassification" ),
            -1,
            OConfigurationTreeRoot::CM_READONLY
        );

        //================================================================
        // go for the global classes
        lcl_ReadGlobalFilters( aFilterClassification, _rGlobalClasses, _rGlobalClassNames );

        //================================================================
        // fo for the local classes
        lcl_ReadLocalFilters( aFilterClassification, _rLocalClasses );

    }

// =======================================================================
// = grouping and classifying
// =======================================================================

    //--------------------------------------------------------------------
    // a struct which adds helps remembering a reference to a class entry
    struct ReferToFilterEntry : public ::std::unary_function< FilterName, void >
    {
    protected:
        FilterGroupEntryReferrer&   m_rEntryReferrer;
        FilterGroup::iterator       m_aClassPos;

    public:
        ReferToFilterEntry( FilterGroupEntryReferrer& _rEntryReferrer, const FilterGroup::iterator& _rClassPos )
            :m_rEntryReferrer( _rEntryReferrer )
            ,m_aClassPos( _rClassPos )
        {
        }

        // operate on a single filter name
        void operator() ( const FilterName& _rName )
        {
#ifdef DBG_UTIL
            ::std::pair< FilterGroupEntryReferrer::iterator, bool > aInsertRes =
#endif
            m_rEntryReferrer.insert( FilterGroupEntryReferrer::value_type( _rName, m_aClassPos ) );
            DBG_ASSERT( aInsertRes.second, "ReferToFilterEntry::operator(): already have an element for this name!" );
        }
    };

    //--------------------------------------------------------------------
    struct FillClassGroup : public ::std::unary_function< FilterClass, void >
    {
    protected:
        FilterGroup&                m_rClassGroup;
        FilterGroupEntryReferrer&   m_rClassReferrer;

    public:
        FillClassGroup( FilterGroup& _rClassGroup, FilterGroupEntryReferrer& _rClassReferrer )
            :m_rClassGroup      ( _rClassGroup )
            ,m_rClassReferrer   ( _rClassReferrer )
        {
        }

        // operate on a single class
        void operator() ( const FilterClass& _rClass )
        {
            // create an empty filter descriptor for the class
            FilterDescriptor aClassEntry;
            // set it's name (which is all we know by now)
            aClassEntry.First = _rClass.sDisplayName;

            // add it to the group
            m_rClassGroup.push_back( aClassEntry );
            // the position of the newly added class
            FilterGroup::iterator aClassEntryPos = m_rClassGroup.end();
            --aClassEntryPos;

            // and for all the sub filters of the class, remember the class
            // (respectively the position of the class it the group)
            ::std::for_each(
                _rClass.aSubFilters.getConstArray(),
                _rClass.aSubFilters.getConstArray() + _rClass.aSubFilters.getLength(),
                ReferToFilterEntry( m_rClassReferrer, aClassEntryPos )
            );
        }
    };

    //--------------------------------------------------------------------
    static const sal_Unicode s_cWildcardSeparator( ';' );

    //====================================================================
    const ::rtl::OUString& getSeparatorString()
    {
        static ::rtl::OUString s_sSeparatorString( &s_cWildcardSeparator, 1 );
        return s_sSeparatorString;
    }

    //====================================================================
    struct CheckAppendSingleWildcard : public ::std::unary_function< ::rtl::OUString, void >
    {
        ::rtl::OUString& _rToBeExtended;

        CheckAppendSingleWildcard( ::rtl::OUString& _rBase ) : _rToBeExtended( _rBase ) { }

        void operator() ( const ::rtl::OUString& _rWC )
        {
            // check for double wildcards
            sal_Int32 nExistentPos = _rToBeExtended.indexOf( _rWC );
            if  ( -1 < nExistentPos )
            {   // found this wildcard (already part of _rToBeExtended)
                const sal_Unicode* pBuffer = _rToBeExtended.getStr();
                if  (   ( 0 == nExistentPos )
                    ||  ( s_cWildcardSeparator == pBuffer[ nExistentPos - 1 ] )
                    )
                {   // the wildcard really starts at this position (it starts at pos 0 or the previous character is a separator
                    sal_Int32 nExistentWCEnd = nExistentPos + _rWC.getLength();
                    if  (   ( _rToBeExtended.getLength() == nExistentWCEnd )
                        ||  ( s_cWildcardSeparator == pBuffer[ nExistentWCEnd ] )
                        )
                    {   // it's really the complete wildcard we found
                        // (not something like _rWC beeing "*.t" and _rToBeExtended containing "*.txt")
                        // -> outta here
                        return;
                    }
                }
            }

            if ( _rToBeExtended.getLength() )
                _rToBeExtended += getSeparatorString();
            _rToBeExtended += _rWC;
        }
    };

    //====================================================================
    // a helper struct which adds a fixed (Sfx-)filter to a filter group entry given by iterator
    struct AppendWildcardToDescriptor : public ::std::unary_function< FilterGroupEntryReferrer::value_type, void >
    {
    protected:
        ::std::vector< ::rtl::OUString > aWildCards;

    public:
        AppendWildcardToDescriptor( const String& _rWildCard );

        // operate on a single class entry
        void operator() ( const FilterGroupEntryReferrer::value_type& _rClassReference )
        {
            // simply add our wildcards
            ::std::for_each(
                aWildCards.begin(),
                aWildCards.end(),
                CheckAppendSingleWildcard( _rClassReference.second->Second )
            );
        }
    };

    //====================================================================
    AppendWildcardToDescriptor::AppendWildcardToDescriptor( const String& _rWildCard )
    {
        DBG_ASSERT( _rWildCard.Len(),
            "AppendWildcardToDescriptor::AppendWildcardToDescriptor: invalid wildcard!" );
        DBG_ASSERT( _rWildCard.GetBuffer()[0] != s_cWildcardSeparator,
            "AppendWildcardToDescriptor::AppendWildcardToDescriptor: wildcard already separated!" );

        aWildCards.reserve( _rWildCard.GetTokenCount( s_cWildcardSeparator ) );

        const sal_Unicode* pTokenLoop = _rWildCard.GetBuffer();
        const sal_Unicode* pTokenLoopEnd = pTokenLoop + _rWildCard.Len();
        const sal_Unicode* pTokenStart = pTokenLoop;
        for ( ; pTokenLoop != pTokenLoopEnd; ++pTokenLoop )
        {
            if ( ( s_cWildcardSeparator == *pTokenLoop ) && ( pTokenLoop > pTokenStart ) )
            {   // found a new token separator (and a non-empty token)
                aWildCards.push_back( ::rtl::OUString( pTokenStart, pTokenLoop - pTokenStart ) );

                // search the start of the next token
                while ( ( pTokenStart != pTokenLoopEnd ) && ( *pTokenStart != s_cWildcardSeparator ) )
                    ++pTokenStart;

                if ( pTokenStart == pTokenLoopEnd )
                    // reached the end
                    break;

                ++pTokenStart;
                pTokenLoop = pTokenStart;
            }
        }
        if ( pTokenLoop > pTokenStart )
            // the last one ....
            aWildCards.push_back( ::rtl::OUString( pTokenStart, pTokenLoop - pTokenStart ) );
    }

    //--------------------------------------------------------------------
    void lcl_InitGlobalClasses( GroupedFilterList& _rAllFilters, const FilterClassList& _rGlobalClasses, FilterGroupEntryReferrer& _rGlobalClassesRef )
    {
        // we need an extra group in our "all filters" container
        _rAllFilters.push_front( FilterGroup() );
        FilterGroup& rGlobalFilters = _rAllFilters.front();
            // it's important to work on the reference: we want to access the members of this filter group
            // by an iterator (FilterGroup::const_iterator)
        // the referrer for the global classes

        // initialize the group
        ::std::for_each(
            _rGlobalClasses.begin(),
            _rGlobalClasses.end(),
            FillClassGroup( rGlobalFilters, _rGlobalClassesRef )
        );
            // now we have:
            // in rGlobalFilters: a list of FilterDescriptor's, where each's discriptor's display name is set to the name of a class
            // in aGlobalClassesRef: a mapping from logical filter names to positions within rGlobalFilters
            //  this way, if we encounter an arbitrary filter, we can easily (and efficient) check if it belongs to a global class
            //  and modify the descriptor for this class accordingly
    }

    //--------------------------------------------------------------------
    typedef ::std::vector< ::std::pair< FilterGroupEntryReferrer::mapped_type, FilterGroup::iterator > >
            MapGroupEntry2GroupEntry;
            // this is not really a map - it's just called this way because it is used as a map

    struct FindGroupEntry : public ::std::unary_function< MapGroupEntry2GroupEntry::value_type, sal_Bool >
    {
        FilterGroupEntryReferrer::mapped_type aLookingFor;
        FindGroupEntry( FilterGroupEntryReferrer::mapped_type _rLookingFor ) : aLookingFor( _rLookingFor ) { }

        sal_Bool operator() ( const MapGroupEntry2GroupEntry::value_type& _rMapEntry )
        {
            return _rMapEntry.first == aLookingFor ? sal_True : sal_False;
        }
    };

    struct CopyGroupEntryContent : public ::std::unary_function< MapGroupEntry2GroupEntry::value_type, void >
    {
        void operator() ( const MapGroupEntry2GroupEntry::value_type& _rMapEntry )
        {
#ifdef DBG_UTIL
            FilterDescriptor aHaveALook = *_rMapEntry.first;
#endif
            *_rMapEntry.second = *_rMapEntry.first;
        }
    };

    //--------------------------------------------------------------------
    struct CopyNonEmptyFilter : public ::std::unary_function< FilterDescriptor, void >
    {
        FilterGroup& rTarget;
        CopyNonEmptyFilter( FilterGroup& _rTarget ) :rTarget( _rTarget ) { }

        void operator() ( const FilterDescriptor& _rFilter )
        {
            if ( _rFilter.Second.getLength() )
                rTarget.push_back( _rFilter );
        }
    };

    //--------------------------------------------------------------------
    void lcl_GroupAndClassify( TSortedFilterList& _rFilterMatcher, GroupedFilterList& _rAllFilters )
    {
        _rAllFilters.clear();

        // ===============================================================
        // read the classification of filters
        FilterClassList aGlobalClasses, aLocalClasses;
        StringArray aGlobalClassNames;
        lcl_ReadClassification( aGlobalClasses, aGlobalClassNames, aLocalClasses );

        // ===============================================================
        // for the global filter classes
        FilterGroupEntryReferrer aGlobalClassesRef;
        lcl_InitGlobalClasses( _rAllFilters, aGlobalClasses, aGlobalClassesRef );

        // insert as much placeholders (FilterGroup's) into _rAllFilter for groups as we have global classes
        // (this assumes that both numbers are the same, which, speaking strictly, must not hold - but it does, as we know ...)
        sal_Int32 nGlobalClasses = aGlobalClasses.size();
        while ( nGlobalClasses-- )
            _rAllFilters.push_back( FilterGroup() );

        // ===============================================================
        // for the local classes:
        // if n filters belong to a local class, they do not appear in their respective group explicitly, instead
        // and entry for the class is added to the group and the extensions of the filters are collected under
        // this entry
        FilterGroupEntryReferrer aLocalClassesRef;
        FilterGroup aCollectedLocals;
        ::std::for_each(
            aLocalClasses.begin(),
            aLocalClasses.end(),
            FillClassGroup( aCollectedLocals, aLocalClassesRef )
        );
        // to map from the position within aCollectedLocals to positions within the real groups
        // (where they finally belong to)
        MapGroupEntry2GroupEntry    aLocalFinalPositions;

        // ===============================================================
        // now add the filters
        // the group which we currently work with
        GroupedFilterList::iterator aCurrentGroup = _rAllFilters.end(); // no current group
        // the filter container of the current group - if this changes between two filters, a new group is reached
        String aCurrentServiceName;

        String sFilterWildcard;
        ::rtl::OUString sFilterName;
        // loop through all the filters
        for ( const SfxFilter* pFilter = _rFilterMatcher.First(); pFilter; pFilter = _rFilterMatcher.Next() )
        {
            sFilterName = pFilter->GetFilterName();
            sFilterWildcard = pFilter->GetWildcard().getGlob();
            AppendWildcardToDescriptor aExtendWildcard( sFilterWildcard );

            DBG_ASSERT( sFilterWildcard.Len(), "sfx2::lcl_GroupAndClassify: invalid wildcard of this filter!" );

            // ===========================================================
            // check for a change in the group
            String aServiceName = pFilter->GetServiceName();
            if ( aServiceName != aCurrentServiceName )
            {   // we reached a new group

                ::rtl::OUString sDocServName = aServiceName;

                // look for the place in _rAllFilters where this ne group belongs - this is determined
                // by the order of classes in aGlobalClassNames
                GroupedFilterList::iterator aGroupPos = _rAllFilters.begin();
                DBG_ASSERT( aGroupPos != _rAllFilters.end(),
                    "sfx2::lcl_GroupAndClassify: invalid all-filters array here!" );
                    // the loop below will work on invalid objects else ...
                ++aGroupPos;
                StringArray::iterator aGlobalIter = aGlobalClassNames.begin();
                while   (   ( aGroupPos != _rAllFilters.end() )
                        &&  ( aGlobalIter != aGlobalClassNames.end() )
                        &&  ( *aGlobalIter != sDocServName )
                        )
                {
                    ++aGlobalIter;
                    ++aGroupPos;
                }
                if ( aGroupPos != _rAllFilters.end() )
                    // we found a global class name which matchies the doc service name -> fill the filters of this
                    // group in the respective prepared group
                    aCurrentGroup = aGroupPos;
                else
                    // insert a new entry in our overall-list
                    aCurrentGroup = _rAllFilters.insert( _rAllFilters.end(), FilterGroup() );

                // remember the container to properly detect the next group
                aCurrentServiceName = aServiceName;
            }

            DBG_ASSERT( aCurrentGroup != _rAllFilters.end(), "sfx2::lcl_GroupAndClassify: invalid current group!" );

            // ===========================================================
            // check if the filter is part of a global group
            ::std::pair< FilterGroupEntryReferrer::iterator, FilterGroupEntryReferrer::iterator >
                aBelongsTo = aGlobalClassesRef.equal_range( sFilterName );
            // add the filter to the entries for these classes
            // (if they exist - if not, the range is empty and the for_each is a no-op)
            ::std::for_each(
                aBelongsTo.first,
                aBelongsTo.second,
                aExtendWildcard
            );

            // ===========================================================
            // add the filter to it's group

            // for this, check if the filter is part of a local filter
            FilterGroupEntryReferrer::iterator aBelongsToLocal = aLocalClassesRef.find( sFilterName );
            if ( aLocalClassesRef.end() != aBelongsToLocal )
            {
                // okay, there is a local class which the filter belongs to
                // -> append the wildcard
                aExtendWildcard( *aBelongsToLocal );

                MapGroupEntry2GroupEntry::iterator aThisGroupFinalPos =
                    ::std::find_if( aLocalFinalPositions.begin(), aLocalFinalPositions.end(), FindGroupEntry( aBelongsToLocal->second ) );

                if ( aLocalFinalPositions.end() == aThisGroupFinalPos )
                {   // the position within aCollectedLocals has not been mapped to a final position
                    // within the "real" group (aCollectedLocals is only temporary)
                    // -> do this now (as we just encountered the first filter belonging to this local class
                    // add a new entry which is the "real" group entry
                    aCurrentGroup->push_back( FilterDescriptor( aBelongsToLocal->second->First, String() ) );
                    // the position where we inserted the entry
                    FilterGroup::iterator aInsertPos = aCurrentGroup->end();
                    --aInsertPos;
                    // remember this pos
                    aLocalFinalPositions.push_back( MapGroupEntry2GroupEntry::value_type( aBelongsToLocal->second, aInsertPos ) );
                }
            }
            else
                aCurrentGroup->push_back( FilterDescriptor( pFilter->GetUIName(), sFilterWildcard ) );
        }

        // now just complete the infos for the local groups:
        // During the above loop, they have been collected in aCollectedLocals, but this is only temporary
        // They have to be copied into their final positions (which are stored in aLocalFinalPositions)
        ::std::for_each(
            aLocalFinalPositions.begin(),
            aLocalFinalPositions.end(),
            CopyGroupEntryContent()
        );

        // and remove local groups which do not apply - e.g. have no entries due to the limited content of the
        // current SfxFilterMatcherIter

        FilterGroup& rGlobalFilters = _rAllFilters.front();
        FilterGroup aNonEmptyGlobalFilters;
        ::std::for_each(
            rGlobalFilters.begin(),
            rGlobalFilters.end(),
            CopyNonEmptyFilter( aNonEmptyGlobalFilters )
        );
        rGlobalFilters.swap( aNonEmptyGlobalFilters );
    }

    //--------------------------------------------------------------------
    struct AppendFilter : public ::std::unary_function< FilterDescriptor, void >
    {
        protected:
            Reference< XFilterManager >         m_xFilterManager;
            FileDialogHelper_Impl*              m_pFileDlgImpl;
            bool                                m_bAddExtension;

        public:
            AppendFilter( const Reference< XFilterManager >& _rxFilterManager,
                          FileDialogHelper_Impl* _pImpl, bool _bAddExtension ) :

                m_xFilterManager( _rxFilterManager ),
                m_pFileDlgImpl  ( _pImpl ),
                m_bAddExtension ( _bAddExtension )

            {
                DBG_ASSERT( m_xFilterManager.is(), "AppendFilter::AppendFilter: invalid filter manager!" );
                DBG_ASSERT( m_pFileDlgImpl, "AppendFilter::AppendFilter: invalid filedlg impl!" );
            }

            // operate on a single filter
            void operator() ( const FilterDescriptor& _rFilterEntry )
            {
                String sDisplayText = m_bAddExtension
                    ? addExtension( _rFilterEntry.First, _rFilterEntry.Second, sal_True, *m_pFileDlgImpl )
                    : _rFilterEntry.First;
                m_xFilterManager->appendFilter( sDisplayText, _rFilterEntry.Second );
            }
    };

// =======================================================================
// = handling for the "all files" entry
// =======================================================================

    //--------------------------------------------------------------------
    sal_Bool lcl_hasAllFilesFilter( TSortedFilterList& _rFilterMatcher, String& /* [out] */ _rAllFilterName )
    {
        ::rtl::OUString sUIName;
        sal_Bool        bHasAll = sal_False;
        _rAllFilterName = String( SfxResId( STR_SFX_FILTERNAME_ALL ) );

        // ===============================================================
        // check if there's already a filter <ALL>
        for ( const SfxFilter* pFilter = _rFilterMatcher.First(); pFilter && !bHasAll; pFilter = _rFilterMatcher.Next() )
        {
            if ( pFilter->GetUIName() == _rAllFilterName )
                bHasAll = sal_True;
        }
        return bHasAll;
    }

    //--------------------------------------------------------------------
    void lcl_EnsureAllFilesEntry( TSortedFilterList& _rFilterMatcher, GroupedFilterList& _rFilters )
    {
        // ===============================================================
        String sAllFilterName;
        if ( !lcl_hasAllFilesFilter( _rFilterMatcher, sAllFilterName ) )
        {
            // get the first group of filters (by definition, this group contains the global classes)
            DBG_ASSERT( !_rFilters.empty(), "lcl_EnsureAllFilesEntry: invalid filter list!" );
            if ( !_rFilters.empty() )
            {
                FilterGroup& rGlobalClasses = *_rFilters.begin();
                rGlobalClasses.push_front( FilterDescriptor( sAllFilterName, DEFINE_CONST_UNICODE( FILEDIALOG_FILTER_ALL ) ) );
            }
        }
    }

#ifdef DISABLE_GROUPING_AND_CLASSIFYING
    //--------------------------------------------------------------------
    void lcl_EnsureAllFilesEntry( TSortedFilterList& _rFilterMatcher, const Reference< XFilterManager >& _rxFilterManager, ::rtl::OUString& _rFirstNonEmpty )
    {
        // ===============================================================
        String sAllFilterName;
        if ( !lcl_hasAllFilesFilter( _rFilterMatcher, sAllFilterName ) )
        {
            try
            {
                _rxFilterManager->appendFilter( sAllFilterName, DEFINE_CONST_UNICODE( FILEDIALOG_FILTER_ALL ) );
                _rFirstNonEmpty = sAllFilterName;
            }
            catch( const IllegalArgumentException& )
            {
#ifdef DBG_UTIL
                rtl::OStringBuffer aMsg(RTL_CONSTASCII_STRINGPARAM(
                    "sfx2::lcl_EnsureAllFilesEntry: could not append Filter"));
                aMsg.append(rtl::OUStringToOString(sAllFilterName,
                    RTL_TEXTENCODING_UTF8));
                OSL_FAIL( aMsg.getStr() );
#endif
            }
        }

    }
#endif

// =======================================================================
// = filling an XFilterManager
// =======================================================================

    //--------------------------------------------------------------------
    struct AppendFilterGroup : public ::std::unary_function< FilterGroup, void >
    {
    protected:
        Reference< XFilterManager >         m_xFilterManager;
        Reference< XFilterGroupManager >    m_xFilterGroupManager;
        FileDialogHelper_Impl*              m_pFileDlgImpl;

    public:
        AppendFilterGroup( const Reference< XFilterManager >& _rxFilterManager, FileDialogHelper_Impl* _pImpl )
            :m_xFilterManager       ( _rxFilterManager )
            ,m_xFilterGroupManager  ( _rxFilterManager, UNO_QUERY )
            ,m_pFileDlgImpl         ( _pImpl )
        {
            DBG_ASSERT( m_xFilterManager.is(), "AppendFilterGroup::AppendFilterGroup: invalid filter manager!" );
            DBG_ASSERT( m_pFileDlgImpl, "AppendFilterGroup::AppendFilterGroup: invalid filedlg impl!" );
        }

        void appendGroup( const FilterGroup& _rGroup, bool _bAddExtension )
        {
            try
            {
                if ( m_xFilterGroupManager.is() )
                {   // the file dialog implementation supports visual grouping of filters
                    // create a representation of the group which is understandable by the XFilterGroupManager
                    if ( _rGroup.size() )
                    {
                        Sequence< StringPair > aFilters( _rGroup.size() );
                        ::std::copy(
                            _rGroup.begin(),
                            _rGroup.end(),
                            aFilters.getArray()
                        );
                        if ( _bAddExtension )
                        {
                            StringPair* pFilters = aFilters.getArray();
                            StringPair* pEnd = pFilters + aFilters.getLength();
                            for ( ; pFilters != pEnd; ++pFilters )
                                pFilters->First = addExtension( pFilters->First, pFilters->Second, sal_True, *m_pFileDlgImpl );
                        }
                        m_xFilterGroupManager->appendFilterGroup( ::rtl::OUString(), aFilters );
                    }
                }
                else
                {
                    ::std::for_each(
                        _rGroup.begin(),
                        _rGroup.end(),
                        AppendFilter( m_xFilterManager, m_pFileDlgImpl, _bAddExtension ) );
                }
            }
            catch( const Exception& )
            {
                DBG_UNHANDLED_EXCEPTION();
            }
        }

        // operate on a single filter group
        void operator() ( const FilterGroup& _rGroup )
        {
            appendGroup( _rGroup, true );
        }
    };

    //--------------------------------------------------------------------
    TSortedFilterList::TSortedFilterList(const ::com::sun::star::uno::Reference< ::com::sun::star::container::XEnumeration >& xFilterList)
        : m_nIterator(0)
    {
        if (!xFilterList.is())
            return;

        m_lFilters.clear();
        while(xFilterList->hasMoreElements())
        {
            ::comphelper::SequenceAsHashMap lFilterProps (xFilterList->nextElement());
            ::rtl::OUString                 sFilterName  = lFilterProps.getUnpackedValueOrDefault(
                                                             ::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("Name")),
                                                             ::rtl::OUString());
            if (sFilterName.getLength())
                m_lFilters.push_back(sFilterName);
        }
    }

    //--------------------------------------------------------------------
    const SfxFilter* TSortedFilterList::First()
    {
        m_nIterator = 0;
        return impl_getFilter(m_nIterator);
    }

    //--------------------------------------------------------------------
    const SfxFilter* TSortedFilterList::Next()
    {
        ++m_nIterator;
        return impl_getFilter(m_nIterator);
    }

    //--------------------------------------------------------------------
    const SfxFilter* TSortedFilterList::impl_getFilter(sal_Int32 nIndex)
    {
        if (nIndex<0 || nIndex>=(sal_Int32)m_lFilters.size())
            return 0;
        const ::rtl::OUString& sFilterName = m_lFilters[nIndex];
        if (!sFilterName.getLength())
            return 0;
        return SfxFilter::GetFilterByName(String(sFilterName));
    }

    //--------------------------------------------------------------------
    void appendFiltersForSave( TSortedFilterList& _rFilterMatcher,
                               const Reference< XFilterManager >& _rxFilterManager,
                               ::rtl::OUString& _rFirstNonEmpty, FileDialogHelper_Impl& _rFileDlgImpl,
                               const ::rtl::OUString& _rFactory )
    {
        DBG_ASSERT( _rxFilterManager.is(), "sfx2::appendFiltersForSave: invalid manager!" );
        if ( !_rxFilterManager.is() )
            return;

        ::rtl::OUString sUIName;
        ::rtl::OUString sExtension;

        // retrieve the default filter for this application module.
        // It must be set as first of the generated filter list.
        const SfxFilter* pDefaultFilter = SfxFilterContainer::GetDefaultFilter_Impl(_rFactory);
        // Only use one extension (#i32434#)
        // (and always the first if there are more than one)
        using comphelper::string::getToken;
        sExtension = getToken(pDefaultFilter->GetWildcard().getGlob(), 0, ';');
        sUIName = addExtension( pDefaultFilter->GetUIName(), sExtension, sal_False, _rFileDlgImpl );
        try
        {
            _rxFilterManager->appendFilter( sUIName, sExtension );
            if ( !_rFirstNonEmpty.getLength() )
                _rFirstNonEmpty = sUIName;
        }
        catch( const IllegalArgumentException& )
        {
#ifdef DBG_UTIL
            rtl::OStringBuffer aMsg(RTL_CONSTASCII_STRINGPARAM(
                "Could not append DefaultFilter"));
            aMsg.append(rtl::OUStringToOString(sUIName,
                osl_getThreadTextEncoding()));
            DBG_ERRORFILE(aMsg.getStr());
#endif
        }

        for ( const SfxFilter* pFilter = _rFilterMatcher.First(); pFilter; pFilter = _rFilterMatcher.Next() )
        {
            if (pFilter->GetName() == pDefaultFilter->GetName())
                continue;

            // Only use one extension (#i32434#)
            // (and always the first if there are more than one)
            sExtension = getToken(pFilter->GetWildcard().getGlob(), 0, ';');
            sUIName = addExtension( pFilter->GetUIName(), sExtension, sal_False, _rFileDlgImpl );
            try
            {
                _rxFilterManager->appendFilter( sUIName, sExtension );
                if ( !_rFirstNonEmpty.getLength() )
                    _rFirstNonEmpty = sUIName;
            }
            catch( const IllegalArgumentException& )
            {
    #ifdef DBG_UTIL
                rtl::OStringBuffer aMsg(RTL_CONSTASCII_STRINGPARAM(
                    "Could not append Filter"));
                aMsg.append(rtl::OUStringToOString(sUIName,
                    osl_getThreadTextEncoding()));
                DBG_ERRORFILE( aMsg.getStr() );
    #endif
            }
        }
    }

    struct ExportFilter
    {
        ExportFilter( const rtl::OUString& _aUIName, const rtl::OUString& _aWildcard ) :
            aUIName( _aUIName ), aWildcard( _aWildcard ) {}

        rtl::OUString aUIName;
        rtl::OUString aWildcard;
    };

    //--------------------------------------------------------------------
    void appendExportFilters( TSortedFilterList& _rFilterMatcher,
                              const Reference< XFilterManager >& _rxFilterManager,
                              ::rtl::OUString& _rFirstNonEmpty, FileDialogHelper_Impl& _rFileDlgImpl )
    {
        DBG_ASSERT( _rxFilterManager.is(), "sfx2::appendExportFilters: invalid manager!" );
        if ( !_rxFilterManager.is() )
            return;

        sal_Int32                           nHTMLIndex  = -1;
        sal_Int32                           nXHTMLIndex  = -1;
        sal_Int32                           nPDFIndex   = -1;
        sal_Int32                           nFlashIndex = -1;
        ::rtl::OUString                     sUIName;
        ::rtl::OUString                     sExtensions;
        std::vector< ExportFilter >         aImportantFilterGroup;
        std::vector< ExportFilter >         aFilterGroup;
        Reference< XFilterGroupManager >    xFilterGroupManager( _rxFilterManager, UNO_QUERY );
        ::rtl::OUString                     sTypeName;
        const ::rtl::OUString               sWriterHTMLType( DEFINE_CONST_OUSTRING("writer_web_HTML") );
        const ::rtl::OUString               sGraphicHTMLType( DEFINE_CONST_OUSTRING("graphic_HTML") );
        const ::rtl::OUString               sXHTMLType( DEFINE_CONST_OUSTRING("XHTML_File") );
        const ::rtl::OUString               sPDFType( DEFINE_CONST_OUSTRING("pdf_Portable_Document_Format") );
        const ::rtl::OUString               sFlashType( DEFINE_CONST_OUSTRING("graphic_SWF") );

        for ( const SfxFilter* pFilter = _rFilterMatcher.First(); pFilter; pFilter = _rFilterMatcher.Next() )
        {
            sTypeName   = pFilter->GetTypeName();
            sUIName     = pFilter->GetUIName();
            sExtensions = pFilter->GetWildcard().getGlob();
            ExportFilter aExportFilter( sUIName, sExtensions );
            String aExt = sExtensions;

            if ( nHTMLIndex == -1 &&
                ( sTypeName.equals( sWriterHTMLType ) || sTypeName.equals( sGraphicHTMLType ) ) )
            {
                aImportantFilterGroup.insert( aImportantFilterGroup.begin(), aExportFilter );
                nHTMLIndex = 0;
            }
            else if ( nXHTMLIndex == -1 && sTypeName.equals( sXHTMLType ) )
            {
                std::vector< ExportFilter >::iterator aIter = aImportantFilterGroup.begin();
                if ( nHTMLIndex == -1 )
                    aImportantFilterGroup.insert( aIter, aExportFilter );
                else
                    aImportantFilterGroup.insert( ++aIter, aExportFilter );
                nXHTMLIndex = 0;
            }
            else if ( nPDFIndex == -1 && sTypeName.equals( sPDFType ) )
            {
                std::vector< ExportFilter >::iterator aIter = aImportantFilterGroup.begin();
                if ( nHTMLIndex != -1 )
                    ++aIter;
                if ( nXHTMLIndex != -1 )
                    ++aIter;
                aImportantFilterGroup.insert( aIter, aExportFilter );
                nPDFIndex = 0;
            }
            else if ( nFlashIndex == -1 && sTypeName.equals( sFlashType ) )
            {
                std::vector< ExportFilter >::iterator aIter = aImportantFilterGroup.begin();
                if ( nHTMLIndex != -1 )
                    ++aIter;
                if ( nXHTMLIndex != -1 )
                    ++aIter;
                if ( nPDFIndex != -1 )
                    ++aIter;
                aImportantFilterGroup.insert( aIter, aExportFilter );
                nFlashIndex = 0;
            }
            else
                aFilterGroup.push_back( aExportFilter );
        }

        if ( xFilterGroupManager.is() )
        {
            // Add both html/pdf filter as a filter group to get a separator between both groups
            if ( !aImportantFilterGroup.empty() )
            {
                Sequence< StringPair > aFilters( aImportantFilterGroup.size() );
                for ( sal_Int32 i = 0; i < (sal_Int32)aImportantFilterGroup.size(); i++ )
                {
                    aFilters[i].First   = addExtension( aImportantFilterGroup[i].aUIName,
                                                        aImportantFilterGroup[i].aWildcard,
                                                        sal_False, _rFileDlgImpl );
                    aFilters[i].Second  = aImportantFilterGroup[i].aWildcard;
                }

                try
                {
                    xFilterGroupManager->appendFilterGroup( ::rtl::OUString(), aFilters );
                }
                catch( const IllegalArgumentException& )
                {
                }
            }

            if ( !aFilterGroup.empty() )
            {
                Sequence< StringPair > aFilters( aFilterGroup.size() );
                for ( sal_Int32 i = 0; i < (sal_Int32)aFilterGroup.size(); i++ )
                {
                    aFilters[i].First   = addExtension( aFilterGroup[i].aUIName,
                                                        aFilterGroup[i].aWildcard,
                                                        sal_False, _rFileDlgImpl );
                    aFilters[i].Second  = aFilterGroup[i].aWildcard;
                }

                try
                {
                    xFilterGroupManager->appendFilterGroup( ::rtl::OUString(), aFilters );
                }
                catch( const IllegalArgumentException& )
                {
                }
            }
        }
        else
        {
            // Fallback solution just add both filter groups as single filters
            sal_Int32 n;

            for ( n = 0; n < (sal_Int32)aImportantFilterGroup.size(); n++ )
            {
                try
                {
                    rtl::OUString aUIName = addExtension( aImportantFilterGroup[n].aUIName,
                                                          aImportantFilterGroup[n].aWildcard,
                                                          sal_False, _rFileDlgImpl );
                    _rxFilterManager->appendFilter( aUIName, aImportantFilterGroup[n].aWildcard  );
                    if ( !_rFirstNonEmpty.getLength() )
                        _rFirstNonEmpty = sUIName;

                }
                catch( const IllegalArgumentException& )
                {
        #ifdef DBG_UTIL
                    rtl::OStringBuffer aMsg(RTL_CONSTASCII_STRINGPARAM(
                        "Could not append Filter"));
                    aMsg.append(rtl::OUStringToOString(sUIName,
                        osl_getThreadTextEncoding()));
                    DBG_ERRORFILE( aMsg.getStr() );
        #endif
                }
            }

            for ( n = 0; n < (sal_Int32)aFilterGroup.size(); n++ )
            {
                try
                {
                    rtl::OUString aUIName = addExtension( aFilterGroup[n].aUIName,
                                                          aFilterGroup[n].aWildcard,
                                                          sal_False, _rFileDlgImpl );
                    _rxFilterManager->appendFilter( aUIName, aFilterGroup[n].aWildcard );
                    if ( !_rFirstNonEmpty.getLength() )
                        _rFirstNonEmpty = sUIName;

                }
                catch( const IllegalArgumentException& )
                {
        #ifdef DBG_UTIL
                    rtl::OStringBuffer aMsg(RTL_CONSTASCII_STRINGPARAM(
                        "Could not append Filter"));
                    aMsg.append(rtl::OUStringToOString(sUIName,
                        osl_getThreadTextEncoding()));
                    DBG_ERRORFILE( aMsg.getStr() );
        #endif
                }
            }
        }
    }

    //--------------------------------------------------------------------
    void appendFiltersForOpen( TSortedFilterList& _rFilterMatcher,
                               const Reference< XFilterManager >& _rxFilterManager,
                               ::rtl::OUString& _rFirstNonEmpty, FileDialogHelper_Impl& _rFileDlgImpl )
    {
        DBG_ASSERT( _rxFilterManager.is(), "sfx2::appendFiltersForOpen: invalid manager!" );
        if ( !_rxFilterManager.is() )
            return;

#ifdef DISABLE_GROUPING_AND_CLASSIFYING
        // ===============================================================
        // ensure that there's an entry "all" (with wildcard *.*)
        lcl_EnsureAllFilesEntry( _rFilterMatcher, _rxFilterManager, _rFirstNonEmpty );

        // ===============================================================
        appendFilters( _rFilterMatcher, _rxFilterManager, _rFirstNonEmpty );
#else

        // ===============================================================
        // group and classify the filters
        GroupedFilterList aAllFilters;
        lcl_GroupAndClassify( _rFilterMatcher, aAllFilters );

        // ===============================================================
        // ensure that we have the one "all files" entry
        lcl_EnsureAllFilesEntry( _rFilterMatcher, aAllFilters );

        // ===============================================================
        // the first non-empty string - which we assume is the first overall entry
        if ( !aAllFilters.empty() )
        {
            const FilterGroup& rFirstGroup = *aAllFilters.begin();  // should be the global classes
            if ( !rFirstGroup.empty() )
                _rFirstNonEmpty = rFirstGroup.begin()->First;
            // append first group, without extension
            AppendFilterGroup aGroup( _rxFilterManager, &_rFileDlgImpl );
            aGroup.appendGroup( rFirstGroup, false );
        }

        // ===============================================================
        // append the filters to the manager
        if ( !aAllFilters.empty() )
        {
            ::std::list< FilterGroup >::iterator pIter = aAllFilters.begin();
            ++pIter;
            ::std::for_each(
                pIter, // first filter group was handled seperately, see above
                aAllFilters.end(),
                AppendFilterGroup( _rxFilterManager, &_rFileDlgImpl ) );
        }
#endif
    }

    ::rtl::OUString addExtension( const ::rtl::OUString& _rDisplayText,
                                  const ::rtl::OUString& _rExtension,
                                  sal_Bool _bForOpen, FileDialogHelper_Impl& _rFileDlgImpl )
    {
        static ::rtl::OUString sAllFilter( RTL_CONSTASCII_USTRINGPARAM( "(*.*)" ) );
        static ::rtl::OUString sOpenBracket( RTL_CONSTASCII_USTRINGPARAM( " (" ) );
        static ::rtl::OUString sCloseBracket( RTL_CONSTASCII_USTRINGPARAM( ")" ) );
        ::rtl::OUString sRet = _rDisplayText;

        if ( sRet.indexOf( sAllFilter ) == -1 )
        {
            String sExt = _rExtension;
            if ( !_bForOpen )
            {
                // show '*' in extensions only when opening a document
                sExt = comphelper::string::remove(sExt, '*');
            }
            sRet += sOpenBracket;
            sRet += sExt;
            sRet += sCloseBracket;
        }
        _rFileDlgImpl.addFilterPair( _rDisplayText, sRet );
        return sRet;
    }

//........................................................................
}   // namespace sfx2
//........................................................................


/* vim:set shiftwidth=4 softtabstop=4 expandtab: */