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KDECore

kmimetypetrader.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 "kmimetypetrader.h"
00021 
00022 #include "kservicetypeprofile.h"
00023 #include "kservicetype.h"
00024 #include "kservicetypetrader.h"
00025 #include "kmimetype.h"
00026 #include "kservicefactory.h"
00027 #include "kmimetypefactory.h"
00028 
00029 #include <kdebug.h>
00030 
00031 class KMimeTypeTrader::Private
00032 {
00033 public:
00034     Private() {}
00035 };
00036 
00037 KMimeTypeTrader* KMimeTypeTrader::self()
00038 {
00039     K_GLOBAL_STATIC(KMimeTypeTrader, s_self)
00040     return s_self;
00041 }
00042 
00043 KMimeTypeTrader::KMimeTypeTrader()
00044     : d(new Private())
00045 {
00046 }
00047 
00048 KMimeTypeTrader::~KMimeTypeTrader()
00049 {
00050     delete d;
00051 }
00052 
00053 static KServiceOfferList mimeTypeSycocaOffers(const QString& mimeType)
00054 {
00055     KServiceOfferList lst;
00056     KMimeType::Ptr mime = KMimeTypeFactory::self()->findMimeTypeByName( mimeType, KMimeType::ResolveAliases );
00057     if ( !mime ) {
00058         kWarning(7014) << "KMimeTypeTrader: mimeType" << mimeType << "not found";
00059         return lst; // empty
00060     }
00061     if ( mime->serviceOffersOffset() > -1 ) {
00062         lst = KServiceFactory::self()->offers( mime->offset(), mime->serviceOffersOffset() );
00063     }
00064     return lst;
00065 }
00066 
00067 static KService::List mimeTypeSycocaServiceOffers(const QString& mimeType)
00068 {
00069     KService::List lst;
00070     KMimeType::Ptr mime = KMimeTypeFactory::self()->findMimeTypeByName( mimeType, KMimeType::ResolveAliases );
00071     if ( !mime ) {
00072         kWarning(7014) << "KMimeTypeTrader: mimeType" << mimeType << "not found";
00073         return lst; // empty
00074     }
00075     if ( mime->serviceOffersOffset() > -1 ) {
00076         lst = KServiceFactory::self()->serviceOffers( mime->offset(), mime->serviceOffersOffset() );
00077     }
00078     return lst;
00079 }
00080 
00087 static void filterMimeTypeOffers(KServiceOfferList& list, const QString& genericServiceType)
00088 {
00089     KServiceType::Ptr genericServiceTypePtr = KServiceType::serviceType(genericServiceType);
00090     Q_ASSERT(genericServiceTypePtr);
00091 
00092     QMutableListIterator<KServiceOffer> it(list);
00093     while(it.hasNext()) {
00094         const KService::Ptr servPtr = it.next().service();
00095         // Expand servPtr->hasServiceType( genericServiceTypePtr ) to avoid lookup each time:
00096         if ( !KServiceFactory::self()->hasOffer(genericServiceTypePtr->offset(),
00097                                                 genericServiceTypePtr->serviceOffersOffset(),
00098                                                 servPtr->offset()) ) {
00099             it.remove();
00100         }
00101     }
00102 }
00103 
00104 static void filterMimeTypeOffers(KService::List& list, const QString& genericServiceType)
00105 {
00106     KServiceType::Ptr genericServiceTypePtr = KServiceType::serviceType(genericServiceType);
00107     Q_ASSERT(genericServiceTypePtr);
00108 
00109     QMutableListIterator<KService::Ptr> it(list);
00110     while(it.hasNext()) {
00111         const KService::Ptr servPtr = it.next();
00112         // Expand servPtr->hasServiceType( genericServiceTypePtr ) to avoid lookup each time:
00113         if ( !KServiceFactory::self()->hasOffer(genericServiceTypePtr->offset(),
00114                                                 genericServiceTypePtr->serviceOffersOffset(),
00115                                                 servPtr->offset()) ) {
00116             it.remove();
00117         }
00118     }
00119 }
00120 
00121 KService::List KMimeTypeTrader::query( const QString& mimeType,
00122                                        const QString& genericServiceType,
00123                                        const QString& constraint ) const
00124 {
00125     // Get all services of this mime type.
00126     KService::List lst = mimeTypeSycocaServiceOffers(mimeType);
00127     filterMimeTypeOffers(lst, genericServiceType);
00128 
00129     KServiceTypeTrader::applyConstraints(lst, constraint);
00130 
00131     kDebug(7014) << "query for mimeType " << mimeType << ", " << genericServiceType
00132                  << " : returning " << lst.count() << " offers" << endl;
00133     return lst;
00134 }
00135 
00136 KService::Ptr KMimeTypeTrader::preferredService( const QString & mimeType, const QString & genericServiceType )
00137 {
00138     // First, get all offers known to ksycoca.
00139     KServiceOfferList offers = mimeTypeSycocaOffers( mimeType );
00140 
00141     // Assign preferences from the profile to those offers - and filter for genericServiceType
00142     Q_ASSERT(!genericServiceType.isEmpty());
00143     filterMimeTypeOffers(offers, genericServiceType);
00144 
00145     KServiceOfferList::const_iterator itOff = offers.constBegin();
00146     // Look for the first one that is allowed as default.
00147     // Since the allowed-as-default are first anyway, we only have
00148     // to look at the first one to know.
00149     if( itOff != offers.constEnd() && (*itOff).allowAsDefault() )
00150         return (*itOff).service();
00151 
00152     //kDebug(7014) << "No offers, or none allowed as default";
00153     return KService::Ptr();
00154 }

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