first saving non-working commit

include/tomahawk/playlist.h

@@ -118,7 +118,7 @@ public:
     // these need to exist and be public for the json serialization stuff
     // you SHOULD NOT call them.  They are used for an alternate CTOR method from json.
     // maybe friend QObjectHelper and make them private?
-    Playlist( const source_ptr& author )
+    explicit Playlist( const source_ptr& author )
         : m_source( author )
         , m_lastmodified( 0 )
     {
@@ -155,7 +155,7 @@ public slots:
 
     void resolve();
 
-private:
+protected:
     // called from loadAllPlaylists DB cmd:
     explicit Playlist( const source_ptr& src,
                        const QString& currentrevision,
@@ -173,9 +173,14 @@ private:
                        const QString& info,
                        const QString& creator,
                        bool shared );
-
-    void rundb();
-
+    
+    QList<plentry_ptr> newEntries( const QList< plentry_ptr >& entries );
+    PlaylistRevision setNewRevision( const QString& rev,
+                                     const QList<QString>& neworderedguids,
+                                     const QList<QString>& oldorderedguids,
+                                     bool is_newest_rev,
+                                     const QMap< QString, Tomahawk::plentry_ptr >& addedmap );
+private:
     source_ptr m_source;
     QString m_currentrevision;
     QString m_guid, m_title, m_info, m_creator;

include/tomahawk/typedefs.h

@@ -11,6 +11,7 @@ namespace Tomahawk
     class Collection;
     class Playlist;
     class PlaylistEntry;
+    class DynamicPlaylist;
     class Query;
     class Result;
     class Source;
@@ -18,6 +19,7 @@ namespace Tomahawk
     typedef QSharedPointer<Collection> collection_ptr;
     typedef QSharedPointer<Playlist> playlist_ptr;
     typedef QSharedPointer<PlaylistEntry> plentry_ptr;
+    typedef QSharedPointer<DynamicPlaylist> dynplaylist_ptr;
     typedef QSharedPointer<Query> query_ptr;
     typedef QSharedPointer<Result> result_ptr;
     typedef QSharedPointer<Source> source_ptr;

src/CMakeLists.txt

@@ -91,6 +91,10 @@ SET( tomahawkSources ${tomahawkSources}
      database/databasecommand_updatesearchindex.cpp
      database/databasecollection.cpp
 
+     dynamic/dynamicplaylist.cpp
+     dynamic/dynamiccontrol.cpp
+     dynamic/generatorfactory.cpp
+
      scrobbler.cpp
      xmppbot/xmppbot.cpp
      web/api_v1.cpp
@@ -222,6 +226,11 @@ SET( tomahawkHeaders ${tomahawkHeaders}
      network/filetransferconnection.h
      network/dbsyncconnection.h
 
+     dynamic/dynamicplaylist.h
+     dynamic/dynamiccontrol.h
+     dynamic/generatorfactory.h
+     dynamic/generatorinterface.h
+
      musicscanner.h
      scriptresolver.h
      tomahawksettings.h
@@ -308,6 +317,7 @@ INCLUDE_DIRECTORIES(
     sourcetree
     topbar
     utils
+    dynamic
 
     ../rtaudio
     ../alsa-playback

src/dynamic/dynamiccontrol.h

@@ -0,0 +1,6 @@
+#ifndef DYNAMIC_PLAYLIST_CONTROL
+#define DYNAMIC_PLAYLIST_CONTROL
+
+
+
+#endif

src/dynamic/dynamicplaylist.cpp

@@ -0,0 +1,238 @@
+#include "dynamicplaylist.h"
+
+#include "tomahawk/tomahawkapp.h"
+
+using namespace Tomahawk;
+
+// Called by loadAllPlaylists command
+DynamicPlaylist::DynamicPlaylist ( const Tomahawk::source_ptr& src, 
+                                   const QString& currentrevision,
+                                   const QString& title, 
+                                   const QString& info, 
+                                   const QString& creator, 
+                                   const QString& type, 
+                                   bool shared, 
+                                   int lastmod, 
+                                   const QString& guid )
+    : Playlist( src, currentrevision, title, info, creator, shared, lastmod, guid )
+{
+    qDebug() << "Creating Dynamic Playlist 1";
+    // TODO instantiate generator
+}
+
+
+// called when a new playlist is created (no currentrevision, new guid)
+DynamicPlaylist::DynamicPlaylist ( const Tomahawk::source_ptr& author, 
+                                   const QString& guid, 
+                                   const QString& title, 
+                                   const QString& info, 
+                                   const QString& creator, 
+                                   const QString& type, 
+                                   bool shared )
+    : Playlist ( author, guid, title, info, creator, shared )
+{
+        qDebug() << "Creating Dynamic Playlist 2";
+    // TODO instantiate generator
+}
+
+dynplaylist_ptr DynamicPlaylist::create( const Tomahawk::source_ptr& author, 
+                                         const QString& guid, 
+                                         const QString& title, 
+                                         const QString& info, 
+                                         const QString& creator, 
+                                         bool shared )
+{
+    // TODO default generator?
+    QString type = "default_generator";
+    dynplaylist_ptr dynplaylist = new dynplaylist_ptr( new DynamicPlaylist( author, guid, title, info, creator, type, shared ) );
+    
+    DatabaseCommand_CreateDynamicPlaylist* cmd = new DatabaseCommand_CreateDynamicPlaylist( author, dynplaylist );
+    connect( cmd, SIGNAL(finished()), dynplaylist.data(), SIGNAL(created()) );
+    APP->database()->enqueue( QSharedPointer<DatabaseCommand>(cmd) );
+    dynplaylist->reportCreated( dynplaylist );
+    return dynplaylist;
+    
+}
+
+// create a new revision that will be a static playlist, as it has entries
+void DynamicPlaylist::createNewRevision( const QString& newrev, 
+                                          const QString& oldrev, 
+                                          const QString& type, 
+                                          const QList< dyncontrol_ptr>& controls, 
+                                          const QList< plentry_ptr >& entries )
+{
+    // get the newly added tracks
+    QList< plentry_ptr > added = newEntries( entries );
+    
+    QStringList orderedguids;
+    foreach( plentry_ptr p, entries )
+        orderedguids << p->guid();
+    
+    // no conflict resolution or partial updating for controls. all or nothing baby
+        
+    // source making the change (localy user in this case)
+    source_ptr author = APP->sourcelist().getLocal();
+    // command writes new rev to DB and calls setRevision, which emits our signal
+    DatabaseCommand_SetDynamicPlaylistRevision* cmd =
+    new DatabaseCommand_SetDynamicPlaylistRevision( author,
+                                                     guid(),
+                                                     newrev,
+                                                     oldrev,
+                                                     orderedguids,
+                                                     added,
+                                                     type,
+                                                     STATIC,
+                                                    controls );
+    APP->database()->enqueue( QSharedPointer<DatabaseCommand>( cmd ) );
+}
+
+// create a new revision that will be an ondemand playlist, as it has no entries
+void DynamicPlaylist::createNewRevision( const QString& newrev, 
+                                          const QString& oldrev, 
+                                          const QString& type, 
+                                          const QList< dyncontrol_ptr>& controls )
+{
+    // can skip the entry stuff. just overwrite with new info
+    source_ptr author = APP->sourcelist().getLocal();
+    // command writes new rev to DB and calls setRevision, which emits our signal
+    DatabaseCommand_SetDynamicPlaylistRevision* cmd =
+    new DatabaseCommand_SetDynamicPlaylistRevision( author,
+                                                    guid(),
+                                                    newrev,
+                                                    oldrev,
+                                                    type,
+                                                    STATIC,
+                                                    controls );
+    APP->database()->enqueue( QSharedPointer<DatabaseCommand>( cmd ) );
+}
+
+void DynamicPlaylist::loadRevision( const QString& rev )
+{
+    qDebug() << Q_FUNC_INFO;
+    
+    DatabaseCommand_LoadDynamicPlaylist* cmd =
+    new DatabaseCommand_LoadDynamicPlaylist( rev.isEmpty() ? currentrevision() : rev, m_generator->mode() );
+    
+    if( m_generator->mode() == ONDEMAND ) {
+        connect( cmd, SIGNAL( done( QString,
+                                    bool,
+                                    const QString,
+                                    QList< dyncontrol_ptr>,
+                                    bool ) ),
+                 SLOT( setRevision( QString,
+                                    bool,
+                                    const QString,
+                                    QList< dyncontrol_ptr>,
+                                    bool) ) );
+    } else if( m_generator->mode() == STATIC ) {
+        connect( cmd, SIGNAL( done( QString,
+                                    QList< QString >,
+                                    QList< QString >,
+                                    QString,
+                                    QList< dyncontrol_ptr>,
+                                    bool,
+                                    const QMap< QString, Tomahawk::plentry_ptr >,
+                                    bool ) ),
+                 SLOT( setRevision( QString,
+                                    QList< QString >,
+                                    QList< QString >,
+                                    QString,
+                                    QList< dyncontrol_ptr>,
+                                    bool,
+                                    const QMap< QString, Tomahawk::plentry_ptr >,
+                                    bool ) ) );        
+        
+    }
+    APP->database()->enqueue( QSharedPointer<DatabaseCommand>( cmd ) );
+}
+
+bool DynamicPlaylist::remove( const Tomahawk::dynplaylist_ptr& playlist )
+{
+    return remove( playlist.staticCast<Tomahawk::playlist_ptr>() );
+}
+
+void DynamicPlaylist::reportCreated( const Tomahawk::dynplaylist_ptr& self )
+{
+    qDebug() << Q_FUNC_INFO;
+    Q_ASSERT( self.data() == this );
+    // will emit Collection::playlistCreated(...)
+    m_source->collection()->addPlaylist( self.staticCast<Tomahawk::playlist_ptr>() );    
+}
+
+void DynamicPlaylist::reportDeleted( const Tomahawk::dynplaylist_ptr& self )
+{
+    qDebug() << Q_FUNC_INFO;
+    Q_ASSERT( self.data() == this );
+    // will emit Collection::playlistCreated(...)
+    m_source->collection()->deletePlaylist( self.staticCast<Tomahawk::playlist_ptr>() ); 
+}
+
+// static version
+void DynamicPlaylist::setRevision( const QString& rev, 
+                                    const QList< QString >& neworderedguids, 
+                                    const QList< QString >& oldorderedguids, 
+                                    const QString& type, 
+                                    const QList< dyncontrol_ptr>& controls, 
+                                    bool is_newest_rev, 
+                                    const QMap< QString, plentry_ptr >& addedmap, 
+                                    bool applied )
+{
+    // we're probably being called by a database worker thread
+    if( QThread::currentThread() != thread() )
+    {
+        QMetaObject::invokeMethod( this,
+                                   "setRevision",
+                                   Qt::BlockingQueuedConnection,
+                                   Q_ARG( QString, rev ),
+                                   Q_ARG( QList<QString>, neworderedguids ),
+                                   Q_ARG( QList<QString>, oldorderedguids ),
+                                   Q_ARG( QString, type ),
+                                   QGenericArgument( "QList< dyncontrol_ptr >" , (const void*)&controls ),
+                                   Q_ARG( bool, is_newest_rev ),
+                                   QGenericArgument( "QMap< QString,Tomahawk::plentry_ptr >" , (const void*)&addedmap ),
+                                   Q_ARG( bool, applied ) );
+        return;
+    }
+    if( m_generator->type() != type ) { // new generator needed
+        m_generator = generatorinterface_ptr( GeneratorFactory::create( type ) );
+    }
+    
+    m_generator->setControls( controls );
+    m_generator->setMode( ONDEMAND )
+    
+    DynamicPlaylistRevision pr = DynamicPlaylistRevision( setNewRevision( rev, neworderedguids, oldorderedguids, is_newest_rev, addedmap ) );
+    pr.controls = controls;
+    pr.type = type;
+    pr.mode = STATIC;
+    
+    if( applied )
+        setCurrentRevision( rev );
+    pr.applied = applied;
+    
+    emit revisionLoaded( pr );    
+}
+
+// ondemand version
+void DynamicPlaylist::setRevision( const QString& rev, 
+                                    bool is_newest_rev, 
+                                    const QString& type, 
+                                    const QList< dyncontrol_ptr>& controls, 
+                                    bool applied )
+{
+    if( m_generator->type() != type ) { // new generator needed
+        m_generator = generatorinterface_ptr( GeneratorFactory::create( type ) );
+    }
+
+    m_generator->setControls( controls );
+    m_generator->setMode( ONDEMAND )
+    
+    DynamicPlaylistRevision pr;
+    pr.oldrevisionguid = m_currentrevision;
+    pr.revisionguid = rev;
+    pr.controls = controls;
+    pr.type = type;
+    pr.mode = ONDEMAND;
+    
+    emit revisionLoaded( pr );
+}
+

src/dynamic/dynamicplaylist.h

@@ -0,0 +1,120 @@
+#ifndef DYNAMIC_PLAYLIST_H
+#define DYNAMIC_PLAYLIST_H
+
+#include <QObject>
+#include <QList>
+#include <QSharedPointer>
+
+#include "tomahawk/playlist.h"
+#include "dynamic/generatorinterface.h"
+
+namespace Tomahawk {
+    
+/**
+ * Subclass of playlist that adds the information needed to store a dynamic playlist.
+ *  It uses normal PlaylistEntries but also has a mode, a generator, and a list of controls
+*/
+
+class DynamicPlaylist : public Playlist
+{
+    Q_OBJECT
+    
+    Q_PROPERTY( GeneratorMode mode  WRITE setMode   READ mode )
+    Q_PROPERTY( QString type                  WRITE setType   READ type )
+        
+public:
+    enum DynamicPlaylistMode {
+        OnDemand = 0,
+        StaticPlaylist
+    };
+    
+    /// Generate an empty dynamic playlist with default generator
+    static Tomahawk::dynplaylist_ptr create( const source_ptr& author,
+                                          const QString& guid,
+                                          const QString& title,
+                                          const QString& info,
+                                          const QString& creator,
+                                          bool shared
+                                          );
+    static bool remove( const dynplaylist_ptr& playlist );
+    
+    virtual void loadRevision( const QString& rev = "" );
+    
+    GeneratorMode mode() const { return m_generator->mode(); }
+    QString type() const { return m_generator->type(); }
+    generatorinterface_ptr generator() const { return m_generator; }
+    
+    // <IGNORE hack="true">
+    // these need to exist and be public for the json serialization stuff
+    // you SHOULD NOT call them.  They are used for an alternate CTOR method from json.
+    // maybe friend QObjectHelper and make them private?
+    explicit DynamicPlaylist( const source_ptr& author )
+    : Playlist( author )
+    {
+        qDebug() << Q_FUNC_INFO << "JSON";
+    }
+    void setMode( GeneratorMode mode ) { m_generator->setMode( mode ); }
+    void setType( const QString& type )           { /** TODO */; }
+    void setGenerator( const generatorinterface_ptr& gen_ptr )            { m_generator = gen_ptr; }
+    // </IGNORE>
+    
+signals:
+    /// emitted when the playlist revision changes (whenever the playlist changes)
+    void revisionLoaded( Tomahawk::DynamicPlaylistRevision );
+    
+public slots:
+    // want to update the playlist from the model?
+    // generate a newrev using uuid() and call this:
+    // if this is a static playlist, pass it a new list of entries. implicitly sets mode to static
+    void createNewRevision( const QString& newrev, const QString& oldrev, const QString& type, const QList< dyncontrol_ptr>& controls, const QList< plentry_ptr >& entries );
+    // if it is ondemand, no entries are needed implicitly sets mode to ondemand
+    void createNewRevision( const QString& newrev, const QString& oldrev, const QString& type, const QList< dyncontrol_ptr>& controls );
+    
+    void reportCreated( const Tomahawk::dynplaylist_ptr& self );
+    void reportDeleted( const Tomahawk::dynplaylist_ptr& self );
+    
+    // called from setdynamicplaylistrevision db cmd
+    // static version
+    void setRevision( const QString& rev,
+                      const QList<QString>& neworderedguids,
+                      const QList<QString>& oldorderedguids,
+                      const QString& type,
+                      const QList< dyncontrol_ptr>& controls,
+                      bool is_newest_rev,
+                      const QMap< QString, Tomahawk::plentry_ptr >& addedmap,
+                      bool applied );
+   
+    // ondemand version
+    void setRevision( const QString& rev,
+                      bool is_newest_rev,
+                      const QString& type,
+                      const QList< dyncontrol_ptr>& controls,
+                      bool applied );
+private:
+    // called from loadAllPlaylists DB cmd:
+    explicit DynamicPlaylist( const source_ptr& src,
+                       const QString& currentrevision,
+                       const QString& title,
+                       const QString& info,
+                       const QString& creator,
+                       const QString& type,
+                       bool shared,
+                       int lastmod,
+                       const QString& guid = "" ); // populate db
+    
+    // called when creating new playlist
+    explicit DynamicPlaylist( const source_ptr& author,
+                       const QString& guid,
+                       const QString& title,
+                       const QString& info,
+                       const QString& creator,
+                       const QString& type,
+                       bool shared );
+    
+private:
+    generatorinterface_ptr m_generator;
+};
+
+}; // namespace
+
+#endif

src/dynamic/generatorfactory.cpp

@@ -0,0 +1,23 @@
+#include "generatorfactory.h"
+
+Tomahawk::GeneratorFactory::GeneratorFactory()
+{
+}
+
+Tomahawk::GeneratorFactory::~GeneratorFactory()
+{
+    qDeleteAll( m_factories.values() );
+}
+
+generatorinterface_ptr Tomahawk::GeneratorFactory::create ( const QString& type )
+{
+    if( !m_factories.contains( type ) )
+        return generatorinterface_ptr();
+    
+    return generatorinterface_ptr( m_factories.value( type )->create() );
+}
+
+void Tomahawk::GeneratorFactory::registerFactory ( const QString& type, Tomahawk::GeneratorFactoryInterface* interface )
+{
+    m_factories.insert( type, interface );
+}

src/dynamic/generatorfactory.h

@@ -0,0 +1,39 @@
+#ifndef GENERATOR_FACTORY_H
+#define GENERATOR_FACTORY_H
+
+#include <QHash>
+#include <QString>
+
+namespace Tomahawk {
+    
+/**
+  * Generators should subclass this and have it create the custom Generator
+  */
+class GeneratorFactoryInterface
+{
+public:
+    GeneratorInterface* create() = 0;
+};
+
+/**
+ * Simple factory that generates Generators from string type descriptors
+ */
+class GeneratorFactory
+{
+public:
+    GeneratorFactory();
+    ~GeneratorFactory();
+    
+    generatorinterface_ptr create( const QString& type );
+    
+    void registerFactory( const QString& type, GeneratorFactoryInterface* interface );
+    
+private:
+    QHash<QString, GeneratorFactoryInterface*> m_factories;
+    
+};
+
+
+};
+
+#endif

src/dynamic/generatorinterface.h

@@ -0,0 +1,52 @@
+#ifndef GENERATOR_INTERFACE_H
+#define GENERATOR_INTERFACE_H
+
+#include <QtCore/QObject>
+
+namespace Tomahawk {
+
+enum GeneratorMode {
+    OnDemand = 0,
+    Static
+};
+    
+/**
+ * The abstract interface for Dynamic Playlist Generators. Generators have the following features:
+ *      - They create new DynamicControls that are appropriate for the generator
+ *      - They expose a list of controls that this generator currently is operating on
+ *      - They have a state of OnDemand or Static
+ */
+class GeneratorInterface : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY( QString         type READ type )
+    Q_PROPERTY( GeneratorMode   mode READ mode WRITE setMode );
+    Q_ENUMS( GeneratorMode )
+    
+public:
+    explicit GeneratorInterface() {}
+    virtual ~GeneratorInterface() {}
+    
+    // Can't make it pure otherwise we can't shove it in QVariants :-/
+    virtual dyncontrol_ptr createControl() const {}
+    
+    /// The type of this generator
+    virtual QString type() const { return m_type; }
+    
+    virtual GeneratorMode mode() const { return m_mode; }
+    virtual void setMode( GeneratorMode mode ) { m_mode = mode; }
+    
+    // control functions
+    virtual QList< dyncontrol_ptr > controls() const { return m_controls; }
+    virtual void addControl( const dyncontrol_ptr& control ) { m_controls << control; }
+    virtual void clearControls() { m_controls.clear(); }
+    virtual void setControls( const QList< dyncontrol_ptr>& controls ) { m_controls = controls; }
+private:
+    QString m_type;
+    GeneratorMode m_mode;
+    QList< dyncontrol_ptr > m_controls;
+};
+
+};
+
+#endif

src/playlist.cpp

@@ -168,21 +168,11 @@ void
 Playlist::createNewRevision( const QString& newrev, const QString& oldrev, const QList< plentry_ptr >& entries )
 {
    // qDebug() << "m_entries guids:";
-   // foreach( plentry_ptr pp, m_entries ) qDebug() << pp->guid();
-
-    QSet<QString> currentguids;
-    foreach( plentry_ptr p, m_entries )
-        currentguids.insert( p->guid() ); // could be cached as member?
-
     // calc list of newly added entries:
-    QList<plentry_ptr> added;
+    QList<plentry_ptr> added = newEntries( entries );
     QStringList orderedguids;
     foreach( plentry_ptr p, entries )
-    {
         orderedguids << p->guid();
-        if( !currentguids.contains(p->guid()) )
-            added << p;
-    }
 
     // source making the change (localy user in this case)
     source_ptr author = APP->sourcelist().getLocal();
@@ -225,87 +215,9 @@ Playlist::setRevision( const QString& rev,
                                  );
         return;
     }
-    //qDebug() << Q_FUNC_INFO << (qlonglong)this
-    //        << rev << neworderedguids << oldorderedguids
-    //        << "isnewest:" << is_newest_rev << addedmap << applied << m_entries
-    //        ;
-
-    // build up correctly ordered new list of plentry_ptrs from
-    // existing ones, and the ones that have been added
-    QMap<QString, plentry_ptr> entriesmap;
-    foreach( const plentry_ptr& p, m_entries )
-        entriesmap.insert( p->guid(), p );
-
-    //qDebug() << "Entries map:" << entriesmap;
-
-    QList<plentry_ptr> entries;
-    //qDebug() << "m_entries:" << m_entries.count() << m_entries;
-
-    //qDebug() << "counters:" << neworderedguids.count() << entriesmap.count() << addedmap.count();
-    foreach( const QString& id, neworderedguids )
-    {
-        //qDebug() << "id:" << id;
-        //qDebug() << "newordered:" << neworderedguids.count() << neworderedguids;
-        //qDebug() << "entriesmap:" << entriesmap.count() << entriesmap;
-        //qDebug() << "addedmap:" << addedmap.count() << addedmap;
-        //qDebug() << "m_entries" << m_entries;
-
-        if( entriesmap.contains( id ) )
-        {
-            entries.append( entriesmap.value( id ) );
-        }
-        else if( addedmap.contains( id ) )
-        {
-            entries.append( addedmap.value( id ) );
-            if( is_newest_rev ) m_entries.append( addedmap.value( id ) );
-        }
-        else
-        {
-            Q_ASSERT( false ); // XXX
-        }
-    }
-
-    //qDebug() << Q_FUNC_INFO << rev << entries.length() << applied;
-
-    PlaylistRevision pr;
-    pr.oldrevisionguid = m_currentrevision;
-    pr.revisionguid = rev;
-
-    // entries that have been removed:
-    QSet<QString> removedguids = oldorderedguids.toSet().subtract( neworderedguids.toSet() );
-    //qDebug() << "Removedguids:" << removedguids << "oldorederedguids" << oldorderedguids << "newog" << neworderedguids;
-    foreach( QString remid, removedguids )
-    {
-        // NB: entriesmap will contain old/removed entries only if the removal was done
-        // in the same session - after a restart, history is not in memory.
-        if( entriesmap.contains( remid ) )
-        {
-            pr.removed << entriesmap.value( remid );
-            if( is_newest_rev )
-            {
-                //qDebug() << "Removing from m_entries" << remid;
-                for( int k = 0 ; k<m_entries.length(); ++k )
-                {
-                    if( m_entries.at(k)->guid() == remid )
-                    {
-                        //qDebug() << "removed at " << k;
-                        m_entries.removeAt(k);
-                        break;
-                    }
-                }
-            }
-        }
-    }
-
-    pr.added = addedmap.values();
-
-    //qDebug() << "Revision set:" << rev
-    //         << "added" << pr.added.size()
-    //         << "removed" << pr.removed.size()
-    //         << "total entries" << m_entries.size();
-
-    pr.newlist = entries;
-
+    
+    PlaylistRevision pr = setNewRevision( rev, neworderedguids, oldorderedguids, is_newest_rev, addedmap );
+    
     if( applied )
         m_currentrevision = rev;
     pr.applied = applied;
@@ -313,6 +225,94 @@ Playlist::setRevision( const QString& rev,
     emit revisionLoaded( pr );
 }
 
+PlaylistRevision 
+Playlist::setNewRevision( const QString& rev,
+                                 const QList<QString>& neworderedguids,
+                                 const QList<QString>& oldorderedguids,
+                                 bool is_newest_rev,
+                                 const QMap< QString, Tomahawk::plentry_ptr >& addedmap )
+{
+    //qDebug() << Q_FUNC_INFO << (qlonglong)this
+    //        << rev << neworderedguids << oldorderedguids
+    //        << "isnewest:" << is_newest_rev << addedmap << applied << m_entries
+    //        ;
+    
+    // build up correctly ordered new list of plentry_ptrs from
+    // existing ones, and the ones that have been added
+    QMap<QString, plentry_ptr> entriesmap;
+    foreach( const plentry_ptr& p, m_entries )
+        entriesmap.insert( p->guid(), p );
+    
+    //qDebug() << "Entries map:" << entriesmap;
+        
+        QList<plentry_ptr> entries;
+        //qDebug() << "m_entries:" << m_entries.count() << m_entries;
+        
+        //qDebug() << "counters:" << neworderedguids.count() << entriesmap.count() << addedmap.count();
+        foreach( const QString& id, neworderedguids )
+        {
+            //qDebug() << "id:" << id;
+            //qDebug() << "newordered:" << neworderedguids.count() << neworderedguids;
+            //qDebug() << "entriesmap:" << entriesmap.count() << entriesmap;
+            //qDebug() << "addedmap:" << addedmap.count() << addedmap;
+            //qDebug() << "m_entries" << m_entries;
+            
+            if( entriesmap.contains( id ) )
+            {
+                entries.append( entriesmap.value( id ) );
+            }
+            else if( addedmap.contains( id ) )
+            {
+                entries.append( addedmap.value( id ) );
+                if( is_newest_rev ) m_entries.append( addedmap.value( id ) );
+            }
+            else
+            {
+                Q_ASSERT( false ); // XXX
+            }
+        }
+        
+        //qDebug() << Q_FUNC_INFO << rev << entries.length() << applied;
+        
+        PlaylistRevision pr;
+        pr.oldrevisionguid = m_currentrevision;
+        pr.revisionguid = rev;
+        
+        // entries that have been removed:
+        QSet<QString> removedguids = oldorderedguids.toSet().subtract( neworderedguids.toSet() );
+        //qDebug() << "Removedguids:" << removedguids << "oldorederedguids" << oldorderedguids << "newog" << neworderedguids;
+        foreach( QString remid, removedguids )
+        {
+            // NB: entriesmap will contain old/removed entries only if the removal was done
+            // in the same session - after a restart, history is not in memory.
+            if( entriesmap.contains( remid ) )
+            {
+                pr.removed << entriesmap.value( remid );
+                if( is_newest_rev )
+                {
+                    //qDebug() << "Removing from m_entries" << remid;
+                    for( int k = 0 ; k<m_entries.length(); ++k )
+                    {
+                        if( m_entries.at(k)->guid() == remid )
+                        {
+                            //qDebug() << "removed at " << k;
+                            m_entries.removeAt(k);
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+        
+        pr.added = addedmap.values();
+        
+        //qDebug() << "Revision set:" << rev
+        //         << "added" << pr.added.size()
+        //         << "removed" << pr.removed.size()
+        //         << "total entries" << m_entries.size();
+        
+        pr.newlist = entries;
+}
 
 void Playlist::resolve()
 {
@@ -361,3 +361,20 @@ Playlist::addEntries( const QList<query_ptr>& queries, const QString& oldrev )
     QString newrev = uuid();
     createNewRevision( newrev, oldrev, el );
 }
+
+QList< plentry_ptr >
+Playlist::newEntries( const QList< plentry_ptr > entries )
+{
+    QSet<QString> currentguids;
+    foreach( plentry_ptr p, m_entries )
+        currentguids.insert( p->guid() ); // could be cached as member?
+        
+    // calc list of newly added entries:
+    QList<plentry_ptr> added;
+    foreach( plentry_ptr p, entries )
+    {
+        if( !currentguids.contains(p->guid()) )
+            added << p;
+    }   
+    return added;
+}