emailservices/emailclientapi/src/emailmailboxcache.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:39:21 +0200
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: This file implements class CEmailMailboxCache.
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*
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*/
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#include "emailmailboxcache.h"
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#include "emailapiutils.h"
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static const TInt KCacheGranularity = 2;
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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CEmailMailboxCache* CEmailMailboxCache::NewL()
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    {
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    CEmailMailboxCache* cache = new ( ELeave ) CEmailMailboxCache();
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    return cache;
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    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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CEmailMailboxCache::~CEmailMailboxCache()
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    {
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    iEntries.Close();
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    }
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// ---------------------------------------------------------------------------
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// Start of cache transaction with clenanup support
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// ---------------------------------------------------------------------------
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//
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void CEmailMailboxCache::StartCachingPushL()
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    {
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    TCleanupItem item( &CEmailMailboxCache::CleanupOp, this );
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    CleanupStack::PushL( item );
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    iState = ECaching;
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    iEntries.Reset();
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    }
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// ---------------------------------------------------------------------------
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//  End of cache transaction
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// ---------------------------------------------------------------------------
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//
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void CEmailMailboxCache::EndCachingPop()
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    {
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    iState = EComplete;
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    CleanupStack::Pop();
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    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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TBool CEmailMailboxCache::IsCached() const
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    {
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    return iState == EComplete;
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    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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void CEmailMailboxCache::AddMailboxL( 
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    CPluginData& aPluginData, 
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    const TMailboxId& aMailboxId )
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    {
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    if ( iState != ECaching )
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        {
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        User::Leave( KErrNotReady );
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        }
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    if ( FindById( aMailboxId ) == KErrNotFound )
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        {
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        TCacheEntry entry( &aPluginData, aMailboxId );
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        iEntries.AppendL( entry );
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        }
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    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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CPluginData* CEmailMailboxCache::PluginDataL( const TMailboxId& aMailboxId ) const
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    {
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    CPluginData* pdata = NULL;
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    const TInt index( FindById( aMailboxId ) );
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    if ( index != KErrNotFound )
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        {
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        const TCacheEntry& entry = iEntries[ index ];
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        pdata = entry.iPluginData;
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        }
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    return pdata;
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    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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CPluginData* CEmailMailboxCache::PluginDataL( const TUid& aPluginId ) const
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    {
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    CPluginData* pdata = NULL;
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    const TInt index( FindByPluginIdL( aPluginId ) );
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    if ( index != KErrNotFound )
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        {
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        const TCacheEntry& entry = iEntries[ index ];
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        pdata = entry.iPluginData;
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        }    
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    return pdata;
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    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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void CEmailMailboxCache::GetIdsL( REmailMailboxIdArray& aIdArray ) const
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    {
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    if ( iState != EComplete )
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        {
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        // cache not up to date
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        User::Leave( KErrNotReady );
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        }
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    for ( TInt i=0; i < iEntries.Count(); i++ )
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        {
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        TMailboxId id = iEntries[i].iMailboxId;
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        aIdArray.AppendL( id );
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        }
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    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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TInt CEmailMailboxCache::FindById( const TMailboxId& aMailboxId ) const
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    {
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    TIdentityRelation<TCacheEntry> rel( CEmailMailboxCache::Equals );
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    // don't care about plugin data because this is seach key only and
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    // mailbox id is used for search
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    TCacheEntry entry( NULL, aMailboxId );
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    return iEntries.Find( entry, rel );
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    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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TInt CEmailMailboxCache::FindByPluginIdL( const TUid& aPluginId ) const
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    {
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    TIdentityRelation<TCacheEntry> rel( CEmailMailboxCache::PluginEquals );
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    CPluginData* key = new ( ELeave ) CPluginData( aPluginId );
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    TCacheEntry entry( key, TMailboxId() );
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   165
    TInt index = iEntries.Find( entry, rel ); 
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    delete key;
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    return index;
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    }
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   169
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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   174
TBool CEmailMailboxCache::Equals( const TCacheEntry& a1, const TCacheEntry& a2 )
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   175
    {
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   176
    return ( a1.iMailboxId == a2.iMailboxId );
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   177
    }
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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TBool CEmailMailboxCache::PluginEquals( const TCacheEntry& a1, const TCacheEntry& a2 )
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    {
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    return ( a1.iPluginData->Uid() == a2.iPluginData->Uid() );
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   186
    }
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   187
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// ---------------------------------------------------------------------------
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   189
// Cleanup 
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   190
// ---------------------------------------------------------------------------
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   191
//
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void CEmailMailboxCache::CleanupOp( TAny* aAny )
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   193
    {
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   194
    CEmailMailboxCache* cache = reinterpret_cast<CEmailMailboxCache*>( aAny );
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   195
    cache->iEntries.Reset();
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    cache->iState = EEmpty;
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   197
    }
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   198
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// ---------------------------------------------------------------------------
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// 
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// ---------------------------------------------------------------------------
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//
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   203
CEmailMailboxCache::CEmailMailboxCache() : 
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   204
    iState( EEmpty ), 
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   205
    iEntries( KCacheGranularity )
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parents:
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   206
    {
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   207
    }
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parents:
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   208
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// End of file.