Dolphin: Do not try to connect to Nepomuk if it is not running

Each time one uses any of the Nepomuk classes, an attempt is made to
connect to the database. This slows down the application since
connecting to Nepomuk is not so cheap.

BUG: 321299

1 files changed, 29 insertions, 22 deletions

diff --git a/src/kitemviews/kfileitemmodelrolesupdater.cpp b/src/kitemviews/kfileitemmodelrolesupdater.cpp
index 294778621..eaaab6bc0 100644
--- a/src/kitemviews/kfileitemmodelrolesupdater.cpp
+++ b/src/kitemviews/kfileitemmodelrolesupdater.cpp
@@ -43,6 +43,7 @@
 #ifdef HAVE_NEPOMUK
     #include "private/knepomukrolesprovider.h"
     #include <Nepomuk2/ResourceWatcher>
+    #include <Nepomuk2/ResourceManager>
 #endif
 
 // Required includes for subItemsCount():
@@ -274,31 +275,33 @@ void KFileItemModelRolesUpdater::setRoles(const QSet<QByteArray>& roles)
         m_roles = roles;
 
 #ifdef HAVE_NEPOMUK
-        // Check whether there is at least one role that must be resolved
-        // with the help of Nepomuk. If this is the case, a (quite expensive)
-        // resolving will be done in KFileItemModelRolesUpdater::rolesData() and
-        // the role gets watched for changes.
-        const KNepomukRolesProvider& rolesProvider = KNepomukRolesProvider::instance();
-        bool hasNepomukRole = false;
-        QSetIterator<QByteArray> it(roles);
-        while (it.hasNext()) {
-            const QByteArray& role = it.next();
-            if (rolesProvider.roles().contains(role)) {
-                hasNepomukRole = true;
-                break;
+        if (Nepomuk2::ResourceManager::instance()->initialized()) {
+            // Check whether there is at least one role that must be resolved
+            // with the help of Nepomuk. If this is the case, a (quite expensive)
+            // resolving will be done in KFileItemModelRolesUpdater::rolesData() and
+            // the role gets watched for changes.
+            const KNepomukRolesProvider& rolesProvider = KNepomukRolesProvider::instance();
+            bool hasNepomukRole = false;
+            QSetIterator<QByteArray> it(roles);
+            while (it.hasNext()) {
+                const QByteArray& role = it.next();
+                if (rolesProvider.roles().contains(role)) {
+                    hasNepomukRole = true;
+                    break;
+                }
             }
-        }
 
-        if (hasNepomukRole && !m_nepomukResourceWatcher) {
-            Q_ASSERT(m_nepomukUriItems.isEmpty());
+            if (hasNepomukRole && !m_nepomukResourceWatcher) {
+                Q_ASSERT(m_nepomukUriItems.isEmpty());
 
-            m_nepomukResourceWatcher = new Nepomuk2::ResourceWatcher(this);
-            connect(m_nepomukResourceWatcher, SIGNAL(propertyChanged(Nepomuk2::Resource,Nepomuk2::Types::Property,QVariantList,QVariantList)),
-                    this, SLOT(applyChangedNepomukRoles(Nepomuk2::Resource)));
-        } else if (!hasNepomukRole && m_nepomukResourceWatcher) {
-            delete m_nepomukResourceWatcher;
-            m_nepomukResourceWatcher = 0;
-            m_nepomukUriItems.clear();
+                m_nepomukResourceWatcher = new Nepomuk2::ResourceWatcher(this);
+                connect(m_nepomukResourceWatcher, SIGNAL(propertyChanged(Nepomuk2::Resource,Nepomuk2::Types::Property,QVariantList,QVariantList)),
+                        this, SLOT(applyChangedNepomukRoles(Nepomuk2::Resource)));
+            } else if (!hasNepomukRole && m_nepomukResourceWatcher) {
+                delete m_nepomukResourceWatcher;
+                m_nepomukResourceWatcher = 0;
+                m_nepomukUriItems.clear();
+            }
         }
 #endif
 
@@ -737,6 +740,10 @@ void KFileItemModelRolesUpdater::resolveRecentlyChangedItems()
 void KFileItemModelRolesUpdater::applyChangedNepomukRoles(const Nepomuk2::Resource& resource)
 {
 #ifdef HAVE_NEPOMUK
+    if (!Nepomuk2::ResourceManager::instance()->initialized()) {
+        return;
+    }
+
     const KUrl itemUrl = m_nepomukUriItems.value(resource.uri());
     const KFileItem item = m_model->fileItem(itemUrl);