LibraryList.cpp

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//
// LibraryList.cpp
//
// Copyright (c) Shareaza Development Team, 2002-2005.
// This file is part of SHAREAZA (www.shareaza.com)
//
// Shareaza 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.
//
// Shareaza 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 Shareaza; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//

#include "StdAfx.h"
#include "Shareaza.h"
#include "Application.h"
#include "Library.h"
#include "LibraryList.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

BEGIN_INTERFACE_MAP(CLibraryList, CComObject)
        INTERFACE_PART(CLibraryList, IID_IGenericView, GenericView)
        INTERFACE_PART(CLibraryList, IID_IEnumVARIANT, EnumVARIANT)
END_INTERFACE_MAP()


// CLibraryList construction

CLibraryList::CLibraryList(int nBlockSize)
{
        m_pList         = NULL;
        m_nCount        = 0;
        m_nBuffer       = 0;
        m_nBlock        = nBlockSize;
}

CLibraryList::~CLibraryList()
{
        if ( m_pList != NULL ) free( m_pList );
}

// CLibraryList file access

CLibraryFile* CLibraryList::GetNextFile(POSITION& pos) const
{
        return Library.LookupFile( GetNext( pos ) );
}

// CLibraryList list merging

int CLibraryList::Merge(CLibraryList* pList)
{
        int nCount = 0;

        if ( pList == NULL ) return 0;

        for ( POSITION pos = pList->GetIterator() ; pos ; )
        {
                DWORD nItem = pList->GetNext( pos );

                if ( Find( nItem ) == NULL )
                {
                        AddTail( nItem );
                        nCount++;
                }
        }

        return nCount;
}

// CLibraryList IGenericView

IMPLEMENT_DISPATCH(CLibraryList, GenericView)

STDMETHODIMP CLibraryList::XGenericView::get_Name(BSTR FAR* psName)
{
        METHOD_PROLOGUE( CLibraryList, GenericView )
        CString strName( _T("CLibraryFileView") );
        strName.SetSysString( psName );
        return S_OK;
}

STDMETHODIMP CLibraryList::XGenericView::get_Unknown(IUnknown FAR* FAR* ppUnknown)
{
        METHOD_PROLOGUE( CLibraryList, GenericView )
        return E_NOTIMPL;
}

STDMETHODIMP CLibraryList::XGenericView::get_Param(LONG FAR* pnParam)
{
        METHOD_PROLOGUE( CLibraryList, GenericView )
        return E_NOTIMPL;
}

STDMETHODIMP CLibraryList::XGenericView::get__NewEnum(IUnknown FAR* FAR* ppEnum)
{
        METHOD_PROLOGUE( CLibraryList, GenericView )
        *ppEnum = &pThis->m_xEnumVARIANT;
        pThis->m_xEnumVARIANT.m_pos = pThis->GetHeadPosition();
        AddRef();
        return S_OK;
}

STDMETHODIMP CLibraryList::XGenericView::get_Item(VARIANT vIndex, VARIANT FAR* pvItem)
{
        METHOD_PROLOGUE( CLibraryList, GenericView )

        VARIANT va;
        VariantInit( &va );
        VariantClear( pvItem );

        if ( FAILED( VariantChangeType( &va, (VARIANT FAR*)&vIndex, 0, VT_I4 ) ) ) return E_INVALIDARG;

        if ( va.lVal < 0 || va.lVal >= pThis->GetCount() ) return S_OK;

        for ( POSITION pos = pThis->GetHeadPosition() ; pos ; )
        {
                DWORD nItem = pThis->GetNext( pos );

                if ( va.lVal-- == 0 )
                {
                        pvItem->vt              = VT_I4;
                        pvItem->lVal    = nItem;
                        break;
                }
        }

        return S_OK;
}

STDMETHODIMP CLibraryList::XGenericView::get_Count(LONG FAR* pnCount)
{
        METHOD_PROLOGUE( CLibraryList, GenericView )
        *pnCount = pThis->GetCount();
        return S_OK;
}

// CLibraryList IEnumVARIANT enumerator

IMPLEMENT_UNKNOWN(CLibraryList, EnumVARIANT)

STDMETHODIMP CLibraryList::XEnumVARIANT::Next(ULONG celt, VARIANT FAR* rgvar, ULONG FAR* pceltFetched)
{
        METHOD_PROLOGUE( CLibraryList, EnumVARIANT )

        if ( pceltFetched ) *pceltFetched = 0;
        else if ( celt > 1 ) return E_INVALIDARG;

        if ( m_pos == NULL ) return S_FALSE;

        VariantInit( &rgvar[0] );
        rgvar[0].vt             = VT_I4;
        rgvar[0].lVal   = pThis->GetNext( m_pos );

        if ( pceltFetched ) (*pceltFetched)++;

        return S_OK;
}

STDMETHODIMP CLibraryList::XEnumVARIANT::Skip(ULONG celt)
{
    METHOD_PROLOGUE( CLibraryList, EnumVARIANT )

        while ( celt-- && m_pos ) pThis->GetNext( m_pos );

    return ( celt == 0 ? S_OK : S_FALSE );
}

STDMETHODIMP CLibraryList::XEnumVARIANT::Reset()
{
    METHOD_PROLOGUE( CLibraryList, EnumVARIANT )
        m_pos = pThis->GetHeadPosition();
    return S_OK;
}

STDMETHODIMP CLibraryList::XEnumVARIANT::Clone(IEnumVARIANT FAR* FAR* ppenum)
{
    return E_NOTIMPL;
}

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