1 /*

     2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 

    18 #include "mpxviewpluginresolver_p.h"    // MpxViewPluginResolverPrivate

    19 #include "mpxplugindata.h"

    20 #include "mpxplugindataparser.h"

    21 

    22 #include <mpxviewpluginqt.h>

    23 #include <QHash>

    24 

    25 const char gRequestedPluginInterfaceName [] = "org.nokia.mmdt.MpxViewPlugin/1.0";

    26 

    27 const int gNoneScore( 0 );

    28 const int gSupportedScore( 5 );

    29 const int gImplementationScore( 100 ); 

    30 const int gTypeScore( 1 );

    31 

    32 // ----------------------------------------------------------------------------

    33 // score

    34 // ----------------------------------------------------------------------------

    35 //

    36 static int score( int , const MpxPluginData& );

    37 

    38 // -----------------------------------------------------------------------------

    39 //MpxViewPluginResolverPrivate

    40 // -----------------------------------------------------------------------------

    41 //

    42 MpxViewPluginResolverPrivate::MpxViewPluginResolverPrivate( 

    43         const QList<int>& request )

    44 :

    45 requestedPlugins( request )

    46 {

    47     //No implementation needed

    48 }

    49 

    50 // -----------------------------------------------------------------------------

    51 // ~MpxViewPluginResolverPrivate

    52 // -----------------------------------------------------------------------------

    53 //

    54 MpxViewPluginResolverPrivate::~MpxViewPluginResolverPrivate()

    55 {

    56     //No implementation needed

    57 }

    58 

    59 // -----------------------------------------------------------------------------

    60 // resolvePlugin()

    61 // -----------------------------------------------------------------------------

    62 //

    63 MpxViewPlugin* MpxViewPluginResolverPrivate::resolvePlugin()

    64 {

    65     MpxPluginViewInterface* retVal = 0;

    66     if( 0 < requestedPlugins.count() ){

    67         XQPluginLoader  loader;

    68         QList< XQPluginInfo > impls;

    69         if (loader.listImplementations(gRequestedPluginInterfaceName, impls)) {

    70             retVal = resolveAndLoadPlugins( impls );

    71         }

    72     }

    73     return (retVal!=0) ? retVal->viewPlugin() : 0;

    74 }

    75 

    76 // ----------------------------------------------------------------------------

    77 // resolveAndLoadPlugins( const QList< XQPluginInfo >& impls );

    78 // ----------------------------------------------------------------------------

    79 //

    80 MpxPluginViewInterface* MpxViewPluginResolverPrivate::resolveAndLoadPlugins( 

    81         const QList< XQPluginInfo >& impls )

    82 {

    83     MpxPluginViewInterface* retVal = 0;

    84     

    85     //parse plugin info data 

    86     QHash<const XQPluginInfo*, MpxPluginData* > parsedInfo;

    87     QList< XQPluginInfo >::const_iterator iter( impls.begin() );

    88     MpxPluginDataParser parser;

    89     for( ; iter != impls.end(); ++iter ){

    90         if( 0 < ( *iter ).opaqueData().length() ){

    91             parser.parse( ( *iter ).opaqueData() );

    92             if( parser.data() ){

    93                 parsedInfo.insert( &( *iter ), parser.takeData() );

    94             }

    95         }

    96     }

    97     

    98     //look for optimal plugin

    99     QList<int> uids( requestedPlugins );

   100     QList<int>::iterator currentUidIter,

   101                          optimalUidIter;

   102     QHash<const XQPluginInfo*, MpxPluginData* >::iterator 

   103         currentInfoIter,

   104         optimalInfoIter;

   105     int currentPluginScore( 0 ),

   106         optimalPluginScore( 0 );

   107     

   108     do{

   109         //initialize iterators with invalid objects

   110         optimalInfoIter = parsedInfo.end();

   111         

   112         for( currentUidIter = uids.begin();

   113              uids.end() != currentUidIter;

   114              ++currentUidIter )

   115         {

   116             for( currentInfoIter = parsedInfo.begin();

   117                  parsedInfo.end() != currentInfoIter;

   118                  ++currentInfoIter )

   119             {

   120                 currentPluginScore = score( (*currentUidIter ), 

   121                                             (*(*currentInfoIter) ) );

   122                 if( gNoneScore < currentPluginScore ){

   123                     if( parsedInfo.end() == optimalInfoIter ){

   124                         //first plugin with no zero score. set as optimal

   125                         optimalPluginScore = currentPluginScore;

   126                         optimalInfoIter = currentInfoIter;

   127                         optimalUidIter = currentUidIter;

   128                     }

   129                     if( optimalPluginScore < currentPluginScore ||

   130                         ( ( currentPluginScore == optimalPluginScore ) &&

   131                           ( ( *currentInfoIter )->priority() > ( *optimalInfoIter )->priority() ) ) )

   132                     {

   133                         //current plugin fits better then "optimal" one

   134                         optimalPluginScore = currentPluginScore;

   135                         optimalInfoIter = currentInfoIter;

   136                         optimalUidIter = currentUidIter;

   137                     }

   138                 }

   139             }

   140         }

   141         if( parsedInfo.end() == optimalInfoIter ){

   142              //plugin was not found

   143              break;

   144          }

   145          XQPluginLoader loader( optimalInfoIter.key()->uid() );

   146          if( loader.load() ) {

   147              retVal = qobject_cast<MpxPluginViewInterface*>(loader.instance());

   148          }

   149          //remove already loaded plugin description

   150          delete ( *optimalInfoIter );

   151          parsedInfo.erase( optimalInfoIter );

   152          uids.erase( optimalUidIter );

   153     

   154     }while( NULL == retVal );

   155     uids.clear();

   156     

   157     //clear parsed data structures

   158     for( currentInfoIter = parsedInfo.begin();

   159          parsedInfo.end() != currentInfoIter;

   160          currentInfoIter = parsedInfo.erase( currentInfoIter ) ){

   161          delete ( *currentInfoIter );

   162     }

   163     return retVal;

   164 }

   165 // ----------------------------------------------------------------------------

   166 // score

   167 // ----------------------------------------------------------------------------

   168 //

   169 int score( int uid, const MpxPluginData& pluginData )

   170 {

   171     int retVal( gNoneScore );

   172     QList< int >::const_iterator iter( pluginData.supportedId().begin() );

   173     for( ; iter != pluginData.supportedId().end(); ++iter ){

   174         if( ( *iter ) == uid ){

   175             retVal += gSupportedScore;

   176         }

   177     }

   178     if( pluginData.id() == uid ){

   179         retVal += gImplementationScore; 

   180     }

   181     if( pluginData.type() == uid ){

   182         retVal += gTypeScore;

   183     }

   184     

   185     qDebug(QString("Score 0x%1: %2").arg(uid, 0, 16).arg(retVal).toLatin1().data());

   186     

   187     return retVal;

   188 }