Make virtual AbstractResourceLoader functions private.

Removes the need to call AbstractResourceLoader::load() from
reimplementation.

src/AbstractResourceLoader.h

@@ -47,39 +47,34 @@ each call to ResourceManager::get() will call load() implementation unless the
 resource is already loaded (or loading is in progress). Note that resources
 requested before the loader was added are not be affected by the loader.
 
-Subclassing is done by implementing at least load() function. The loading can
+Subclassing is done by implementing at least doLoad() function. The loading can
 be done synchronously or asynchronously (i.e., in another thread). The base
 implementation provides interface to ResourceManager and manages loading
 progress (which is then available through functions requestedCount(),
 loadedCount() and notFoundCount()). You shouldn't access the ResourceManager
 directly when loading the data.
 
-Your load() implementation must call the base implementation at the beginning
-so ResourceManager is informed about loading state. Then, after your resources
-are loaded, call set() to pass them to ResourceManager or call setNotFound()
-to indicate that the resource was not found.
+In your doLoad() implementation, after your resources are loaded, call set() to
+pass them to ResourceManager or call setNotFound() to indicate that the
+resource was not found.
 
 You can also implement name() to provide meaningful names for resource keys.
 
 Example implementation for synchronous mesh loader:
 @code
 class MeshResourceLoader: public AbstractResourceLoader<Mesh> {
-    public:
-        void load(ResourceKey key) {
-            // Indicate that loading has begun
-            AbstractResourceLoader<Mesh>::load(key);
-
-            // Load the mesh...
-
-            // Not found
-            if(!found) {
-                setNotFound(key);
-                return;
-            }
+    void doLoad(ResourceKey key) override {
+        // Load the mesh...
 
-            // Found, pass it to resource manager
-            set(key, mesh, state, policy);
+        // Not found
+        if(!found) {
+            setNotFound(key);
+            return;
         }
+
+        // Found, pass it to resource manager
+        set(key, mesh, state, policy);
+    }
 };
 @endcode
 
@@ -132,9 +127,9 @@ template<class T> class AbstractResourceLoader {
          * @brief %Resource name corresponding to given key
          *
          * If no such resource exists or the resource name is not available,
-         * returns empty string. Default implementation returns empty string.
+         * returns empty string.
          */
-        virtual std::string name(ResourceKey key) const;
+        std::string name(ResourceKey key) const { return doName(key); }
 
         /**
          * @brief Request resource to be loaded
@@ -144,12 +139,10 @@ template<class T> class AbstractResourceLoader {
          * requested features is incremented. Depending on implementation the
          * resource might be loaded synchronously or asynchronously.
          *
-         * See class documentation for reimplementation guide.
-         *
          * @see ResourceManager::state(), requestedCount(), notFoundCount(),
          *      loadedCount()
          */
-        virtual void load(ResourceKey key) = 0;
+        void load(ResourceKey key);
 
     protected:
         /**
@@ -172,6 +165,25 @@ template<class T> class AbstractResourceLoader {
          */
         void setNotFound(ResourceKey key);
 
+    #ifndef DOXYGEN_GENERATING_OUTPUT
+    private:
+    #else
+    protected:
+    #endif
+        /**
+         * @brief Implementation for name()
+         *
+         * Default implementation returns empty string.
+         */
+        virtual std::string doName(ResourceKey key) const;
+
+        /**
+         * @brief Implementation for load()
+         *
+         * See class documentation for reimplementation guide.
+         */
+        virtual void doLoad(ResourceKey key) = 0;
+
     private:
         Implementation::ResourceManagerData<T>* manager;
         std::size_t _requestedCount;
@@ -183,12 +195,14 @@ template<class T> AbstractResourceLoader<T>::~AbstractResourceLoader() {
     if(manager) manager->_loader = nullptr;
 }
 
-template<class T> std::string AbstractResourceLoader<T>::name(ResourceKey) const { return {}; }
+template<class T> std::string AbstractResourceLoader<T>::doName(ResourceKey) const { return {}; }
 
 template<class T> void AbstractResourceLoader<T>::load(ResourceKey key) {
     ++_requestedCount;
     /** @todo What policy for loading resources? */
     manager->set(key, nullptr, ResourceDataState::Loading, ResourcePolicy::Resident);
+
+    doLoad(key);
 }
 
 template<class T> void AbstractResourceLoader<T>::set(ResourceKey key, T* data, ResourceDataState state, ResourcePolicy policy) {

src/Test/ResourceManagerTest.cpp

@@ -56,18 +56,6 @@ class Data {
 
 typedef Magnum::ResourceManager<Int, Data> ResourceManager;
 
-class IntResourceLoader: public AbstractResourceLoader<Int> {
-    public:
-        void load(ResourceKey key) override {
-            AbstractResourceLoader<Int>::load(key);
-        }
-
-        void load() {
-            set("hello", new Int(773), ResourceDataState::Final, ResourcePolicy::Resident);
-            setNotFound("world");
-        }
-};
-
 size_t Data::count = 0;
 
 ResourceManagerTest::ResourceManagerTest() {
@@ -239,18 +227,30 @@ void ResourceManagerTest::manualPolicy() {
 }
 
 void ResourceManagerTest::loader() {
-    ResourceManager rm;
-    IntResourceLoader loader;
-    rm.setLoader(&loader);
+    class IntResourceLoader: public AbstractResourceLoader<Int> {
+        public:
 
-    Resource<Data> data = rm.get<Data>("data");
-    Resource<Int> hello = rm.get<Int>("hello");
-    Resource<Int> world = rm.get<Int>("world");
+            void load() {
+                set("hello", new Int(773), ResourceDataState::Final, ResourcePolicy::Resident);
+                setNotFound("world");
+            }
+
+        private:
+            void doLoad(ResourceKey) override {}
+    };
+
+    auto rm = new ResourceManager;
+    auto loader = new IntResourceLoader;
+    rm->setLoader(loader);
+
+    Resource<Data> data = rm->get<Data>("data");
+    Resource<Int> hello = rm->get<Int>("hello");
+    Resource<Int> world = rm->get<Int>("world");
     CORRADE_COMPARE(data.state(), ResourceState::NotLoaded);
     CORRADE_COMPARE(hello.state(), ResourceState::Loading);
     CORRADE_COMPARE(world.state(), ResourceState::Loading);
 
-    loader.load();
+    loader->load();
     CORRADE_COMPARE(hello.state(), ResourceState::Final);
     CORRADE_COMPARE(*hello, 773);
     CORRADE_COMPARE(world.state(), ResourceState::NotFound);