text: /*********************************************************************************
   *
   * Inviwo - Interactive Visualization Workshop
   *
   * Copyright (c) 2013-2017 Inviwo Foundation
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   * list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   * 
   *********************************************************************************/
  
  #ifndef IVW_RESOURCE_MANAGER_OBSERVER_H
  #define IVW_RESOURCE_MANAGER_OBSERVER_H
  
  #include <inviwo/core/common/inviwocoredefine.h>
  #include <inviwo/core/util/observer.h>
  #include <inviwo/core/resources/resource.h>
  
  namespace inviwo {
  
  
  /** \class ResourceManagerObserver
   *
   * Observer for list type objects, such as std::vector.
   *
   * @see ListObservable
   */
  class IVW_CORE_API ResourceManagerObserver: public Observer {
  public:
      ResourceManagerObserver() = default;
      
      /**
      * This method will be called when an item has been added to the observed object.
      * Override it to add behavior.
      */
      virtual void resourceAdded(const Resource*) {};
  
      /**
      * This method will be called when an item has been removed from the observed object.
      * Override it to add behavior.
      */
      virtual void resourceRemoved(const Resource*) {};
  };
  
  
  /** \class ResourceManagerObservable
   *
   * Observable for list type objects. Should call notifyResourceAdded as soon as an item
   * has been added to the list and notifyResourceRemoved when an item has been removed.
   *
   * @see Observable
   */
  class IVW_CORE_API ResourceManagerObservable : public Observable<ResourceManagerObserver> {
  public:
      ResourceManagerObservable() = default;
  
      void notifyResourceAdded(const Resource* item) {
          forEachObserver([&](ResourceManagerObserver* o) { o->resourceAdded(item); });
      }
  
      void notifyResourceRemoved(const Resource* item) {
          forEachObserver([&](ResourceManagerObserver* o) { o->resourceRemoved(item); });
      }
  };
  
  } // namespace
  
  #endif // IVW_RESOURCE_MANAGER_OBSERVER_H
  