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KDECore

kservicetypetrader.cpp

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00001 /* This file is part of the KDE libraries
00002    Copyright (C) 2000 Torben Weis <weis@kde.org>
00003    Copyright (C) 2006 David Faure <faure@kde.org>
00004 
00005    This library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Library General Public
00007    License version 2 as published by the Free Software Foundation.
00008 
00009    This library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Library General Public 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
00016    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017    Boston, MA 02110-1301, USA.
00018 */
00019 
00020 #include "kservicetypetrader.h"
00021 
00022 #include "ktraderparsetree_p.h"
00023 #include <kservicetypeprofile.h>
00024 #include <kdebug.h>
00025 #include "kservicetype.h"
00026 #include "kservicetypefactory.h"
00027 #include "kservicefactory.h"
00028 
00029 using namespace KTraderParse;
00030 
00031 // --------------------------------------------------
00032 
00033 namespace KServiceTypeProfile {
00034     KServiceOfferList sortServiceTypeOffers( const KServiceOfferList& list, const QString& servicetype );
00035 }
00036 
00037 KServiceTypeTrader* KServiceTypeTrader::self()
00038 {
00039     K_GLOBAL_STATIC(KServiceTypeTrader, s_globalServiceTypeTrader)
00040     return s_globalServiceTypeTrader;
00041 }
00042 
00043 KServiceTypeTrader::KServiceTypeTrader()
00044     : d(0)
00045 {
00046 }
00047 
00048 KServiceTypeTrader::~KServiceTypeTrader()
00049 {
00050 }
00051 
00052 // shared with KMimeTypeTrader
00053 void KServiceTypeTrader::applyConstraints( KService::List& lst,
00054                                 const QString& constraint )
00055 {
00056     if ( lst.isEmpty() || constraint.isEmpty() )
00057         return;
00058 
00059     const ParseTreeBase::Ptr constr = parseConstraints( constraint ); // for ownership
00060     const ParseTreeBase* pConstraintTree = constr.data(); // for speed
00061 
00062     if ( !!constr )
00063     {
00064         // Find all services matching the constraint
00065         // and remove the other ones
00066         KService::List::iterator it = lst.begin();
00067         while( it != lst.end() )
00068         {
00069             if ( matchConstraint( pConstraintTree, (*it), lst ) != 1 )
00070                 it = lst.erase( it );
00071             else
00072                 ++it;
00073         }
00074     }
00075     // TODO: catch parse errors here (to delete the partial tree)
00076 }
00077 
00078 #if 0
00079 static void dumpOfferList( const KServiceOfferList& offers )
00080 {
00081     kDebug(7014) << "Sorted list:";
00082     OfferList::Iterator itOff = offers.begin();
00083     for( ; itOff != offers.end(); ++itOff )
00084         kDebug(7014) << (*itOff).service()->name() << " allow-as-default=" << (*itOff).allowAsDefault() << " preference=" << (*itOff).preference();
00085 }
00086 #endif
00087 
00088 static KServiceOfferList weightedOffers( const QString& serviceType )
00089 {
00090     //kDebug(7014) << "KServiceTypeTrader::weightedOffers( " << serviceType << " )";
00091 
00092     KServiceType::Ptr servTypePtr = KServiceTypeFactory::self()->findServiceTypeByName( serviceType );
00093     if ( !servTypePtr ) {
00094         kWarning(7014) << "KServiceTypeTrader: serviceType " << serviceType << " not found";
00095         return KServiceOfferList();
00096     }
00097     if ( servTypePtr->serviceOffersOffset() == -1 )  // no offers in ksycoca
00098         return KServiceOfferList();
00099 
00100     // First, get all offers known to ksycoca.
00101     const KServiceOfferList services = KServiceFactory::self()->offers( servTypePtr->offset(), servTypePtr->serviceOffersOffset() );
00102 
00103     const KServiceOfferList offers = KServiceTypeProfile::sortServiceTypeOffers( services, serviceType );
00104     //kDebug(7014) << "Found profile: " << offers.count() << " offers";
00105 
00106 #if 0
00107     dumpOfferList( offers );
00108 #endif
00109 
00110     return offers;
00111 }
00112 
00113 KService::List KServiceTypeTrader::defaultOffers( const QString& serviceType,
00114                                                   const QString& constraint ) const
00115 {
00116     KServiceType::Ptr servTypePtr = KServiceTypeFactory::self()->findServiceTypeByName( serviceType );
00117     if ( !servTypePtr ) {
00118         kWarning(7014) << "KServiceTypeTrader: serviceType " << serviceType << " not found";
00119         return KService::List();
00120     }
00121     if ( servTypePtr->serviceOffersOffset() == -1 )
00122         return KService::List();
00123 
00124     KService::List lst =
00125         KServiceFactory::self()->serviceOffers( servTypePtr->offset(), servTypePtr->serviceOffersOffset() );
00126 
00127     applyConstraints( lst, constraint );
00128 
00129     //kDebug(7014) << "query for serviceType " << serviceType << constraint
00130     //             << " : returning " << lst.count() << " offers" << endl;
00131     return lst;
00132 }
00133 
00134 KService::List KServiceTypeTrader::query( const QString& serviceType,
00135                                           const QString& constraint ) const
00136 {
00137     if ( !KServiceTypeProfile::hasProfile( serviceType ) )
00138     {
00139         // Fast path: skip the profile stuff if there's none (to avoid kservice->serviceoffer->kservice)
00140         // The ordering according to initial preferences is done by kbuildsycoca
00141         return defaultOffers( serviceType, constraint );
00142     }
00143 
00144     KService::List lst;
00145     // Get all services of this service type.
00146     const KServiceOfferList offers = weightedOffers( serviceType );
00147 
00148     // Now extract only the services; the weighting was only used for sorting.
00149     KServiceOfferList::const_iterator itOff = offers.begin();
00150     for( ; itOff != offers.end(); ++itOff )
00151         lst.append( (*itOff).service() );
00152 
00153     applyConstraints( lst, constraint );
00154 
00155     //kDebug(7014) << "query for serviceType " << serviceType << constraint
00156     //             << " : returning " << lst.count() << " offers" << endl;
00157     return lst;
00158 }
00159 
00160 KService::Ptr KServiceTypeTrader::preferredService( const QString & serviceType ) const
00161 {
00162     const KServiceOfferList offers = weightedOffers( serviceType );
00163 
00164     KServiceOfferList::const_iterator itOff = offers.begin();
00165     // Look for the first one that is allowed as default.
00166     // Since the allowed-as-default are first anyway, we only have
00167     // to look at the first one to know.
00168     if( itOff != offers.end() && (*itOff).allowAsDefault() )
00169         return (*itOff).service();
00170 
00171     //kDebug(7014) << "No offers, or none allowed as default";
00172     return KService::Ptr();
00173 }

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