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akonadi

partfetcher.cpp
00001 /*
00002     Copyright (c) 2009 Stephen Kelly <steveire@gmail.com>
00003 
00004     This library is free software; you can redistribute it and/or modify it
00005     under the terms of the GNU Library General Public License as published by
00006     the Free Software Foundation; either version 2 of the License, or (at your
00007     option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful, but WITHOUT
00010     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00011     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00012     License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to the
00016     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017     02110-1301, USA.
00018 */
00019 
00020 #include "partfetcher.h"
00021 
00022 #include "entitytreemodel.h"
00023 #include "session.h"
00024 #include "itemfetchjob.h"
00025 #include "itemfetchscope.h"
00026 #include <KLocale>
00027 
00028 #ifndef KDE_USE_FINAL
00029 Q_DECLARE_METATYPE( QSet<QByteArray> )
00030 #endif
00031 
00032 using namespace Akonadi;
00033 
00034 namespace Akonadi
00035 {
00036 
00037 class PartFetcherPrivate
00038 {
00039   PartFetcherPrivate( PartFetcher *partFetcher, const QModelIndex &index, const QByteArray &partName )
00040       : m_persistentIndex( index ), m_partName( partName ), q_ptr( partFetcher )
00041   {
00042   }
00043 
00044   void fetchJobDone( KJob* );
00045 
00046   void modelDataChanged( const QModelIndex &topLeft, const QModelIndex &bottomRight );
00047 
00048   QPersistentModelIndex m_persistentIndex;
00049   QByteArray m_partName;
00050   Item m_item;
00051 
00052   Q_DECLARE_PUBLIC( PartFetcher )
00053   PartFetcher *q_ptr;
00054 };
00055 
00056 }
00057 
00058 void PartFetcherPrivate::fetchJobDone( KJob *job )
00059 {
00060   Q_Q( PartFetcher );
00061   if ( job->error() ) {
00062     q->setError( KJob::UserDefinedError );
00063     q->setErrorText( i18n( "Unable to fetch item for index" ) );
00064     q->emitResult();
00065     return;
00066   }
00067 
00068   ItemFetchJob *fetchJob = qobject_cast<ItemFetchJob*>( job );
00069 
00070   const Item::List list = fetchJob->items();
00071 
00072   Q_ASSERT( list.size() == 1 );
00073 
00074   // If m_persistentIndex comes from a selection proxy model, it could become
00075   // invalid if the user clicks around a lot.
00076   if ( !m_persistentIndex.isValid() ) {
00077     q->setError( KJob::UserDefinedError );
00078     q->setErrorText( i18n( "Index is no longer available" ) );
00079     q->emitResult();
00080     return;
00081   }
00082 
00083   const QSet<QByteArray> loadedParts = m_persistentIndex.data( EntityTreeModel::LoadedPartsRole ).value<QSet<QByteArray> >();
00084 
00085   Q_ASSERT( !loadedParts.contains( m_partName ) );
00086 
00087   Item item = m_persistentIndex.data( EntityTreeModel::ItemRole ).value<Item>();
00088 
00089   item.apply( list.at( 0 ) );
00090 
00091   QAbstractItemModel *model = const_cast<QAbstractItemModel *>( m_persistentIndex.model() );
00092 
00093   Q_ASSERT( model );
00094 
00095   QVariant itemVariant = QVariant::fromValue( item );
00096   model->setData( m_persistentIndex, itemVariant, EntityTreeModel::ItemRole );
00097 
00098   m_item = item;
00099 
00100   emit q->emitResult();
00101 }
00102 
00103 PartFetcher::PartFetcher( const QModelIndex &index, const QByteArray &partName, QObject *parent )
00104   : KJob( parent ), d_ptr( new PartFetcherPrivate( this, index, partName ) )
00105 {
00106 }
00107 
00108 PartFetcher::~PartFetcher()
00109 {
00110   delete d_ptr;
00111 }
00112 
00113 void PartFetcher::start()
00114 {
00115   Q_D( PartFetcher );
00116 
00117   const QModelIndex index = d->m_persistentIndex;
00118 
00119   const QSet<QByteArray> loadedParts = index.data( EntityTreeModel::LoadedPartsRole ).value<QSet<QByteArray> >();
00120 
00121   if ( loadedParts.contains( d->m_partName ) ) {
00122     d->m_item = d->m_persistentIndex.data( EntityTreeModel::ItemRole ).value<Item>();
00123     emitResult();
00124     return;
00125   }
00126 
00127   const QSet<QByteArray> availableParts = index.data( EntityTreeModel::AvailablePartsRole ).value<QSet<QByteArray> >();
00128   if ( !availableParts.contains( d->m_partName ) ) {
00129     setError( UserDefinedError );
00130     setErrorText( i18n( "Payload part '%1' is not available for this index" , QString::fromLatin1( d->m_partName ) ) );
00131     emitResult();
00132     return;
00133   }
00134 
00135   Akonadi::Session *session = qobject_cast<Akonadi::Session *>( qvariant_cast<QObject *>( index.data( EntityTreeModel::SessionRole ) ) );
00136 
00137   if ( !session ) {
00138     setError( UserDefinedError );
00139     setErrorText( i18n( "No session available for this index" ) );
00140     emitResult();
00141     return;
00142   }
00143 
00144   const Akonadi::Item item = index.data( EntityTreeModel::ItemRole ).value<Akonadi::Item>();
00145 
00146   if ( !item.isValid() ) {
00147     setError( UserDefinedError );
00148     setErrorText( i18n( "No item available for this index" ) );
00149     emitResult();
00150     return;
00151   }
00152 
00153   ItemFetchScope scope;
00154   scope.fetchPayloadPart( d->m_partName );
00155   ItemFetchJob *itemFetchJob = new Akonadi::ItemFetchJob( item, session );
00156   itemFetchJob->setFetchScope( scope );
00157 
00158   connect( itemFetchJob, SIGNAL(result(KJob*)),
00159               this, SLOT(fetchJobDone(KJob*)) );
00160 }
00161 
00162 QModelIndex PartFetcher::index() const
00163 {
00164   Q_D( const PartFetcher );
00165 
00166   return d->m_persistentIndex;
00167 }
00168 
00169 QByteArray PartFetcher::partName() const
00170 {
00171   Q_D( const PartFetcher );
00172 
00173   return d->m_partName;
00174 }
00175 
00176 Item PartFetcher::item() const
00177 {
00178   Q_D( const PartFetcher );
00179 
00180   return d->m_item;
00181 }
00182 
00183 #include "partfetcher.moc"
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