PluginManager: Introduce a getObjects() function taking a predicate

Change-Id: I8a822d76a3dc358de48e96801e4e531f3bbb8669
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/libs/extensionsystem/pluginmanager.h

@@ -75,6 +75,19 @@ public:
         }
         return results;
     }
+    template <typename T, typename Predicate>
+    static QList<T *> getObjects(Predicate predicate)
+    {
+        QReadLocker lock(listLock());
+        QList<T *> results;
+        QList<QObject *> all = allObjects();
+        foreach (QObject *obj, all) {
+            T *result = qobject_cast<T *>(obj);
+            if (result && predicate(result))
+                results += result;
+        }
+        return results;
+    }
     template <typename T> static T *getObject()
     {
         QReadLocker lock(listLock());
@@ -85,6 +98,17 @@ public:
         }
         return 0;
     }
+    template <typename T, typename Predicate> static T *getObject(Predicate predicate)
+    {
+        QReadLocker lock(listLock());
+        QList<QObject *> all = allObjects();
+        foreach (QObject *obj, all) {
+            if (T *result = qobject_cast<T *>(obj))
+                if (predicate(result))
+                    return result;
+        }
+        return 0;
+    }
 
     static QObject *getObjectByName(const QString &name);
     static QObject *getObjectByClassName(const QString &className);