LibraryManipulator is now merely a notifier

Originally `LibraryManipulator` was an abstract class completely decoupled
from `Library`. Its `addBookToLibrary()` and `addBookmarkToLibrary()`
methods could be defined in an arbitrary way. Now `LibraryManipulator` has to be
bound to a library object, those methods are no longer virtual, they always
update the library and allow for some additional actions via virtual
functions `bookWasAddedToLibrary()` and `bookmarkWasAddedToLibrary()`.

include/manager.h

@@ -35,26 +35,23 @@ class xml_document;
 namespace kiwix
 {
 
-class LibraryManipulator {
- public:
-  virtual ~LibraryManipulator() {}
-  virtual bool addBookToLibrary(Book book) = 0;
-  virtual void addBookmarkToLibrary(Bookmark bookmark) = 0;
-};
+class LibraryManipulator
+{
+ public: // functions
+  explicit LibraryManipulator(Library* library);
+  virtual ~LibraryManipulator();
 
-class DefaultLibraryManipulator : public LibraryManipulator {
- public:
-  DefaultLibraryManipulator(Library* library) :
-    library(library) {}
-  virtual ~DefaultLibraryManipulator() {}
-  bool addBookToLibrary(Book book) {
-    return library->addBook(book);
-  }
-  void addBookmarkToLibrary(Bookmark bookmark) {
-    library->addBookmark(bookmark);
-  }
- private:
-   kiwix::Library* library;
+  Library& getLibrary() const { return library; }
+
+  bool addBookToLibrary(const Book& book);
+  void addBookmarkToLibrary(const Bookmark& bookmark);
+
+ protected: // overrides
+  virtual void bookWasAddedToLibrary(const Book& book);
+  virtual void bookmarkWasAddedToLibrary(const Bookmark& bookmark);
+
+ private: // data
+  kiwix::Library& library;
 };
 
 /**

src/manager.cpp

@@ -37,6 +37,44 @@ struct NoDelete
 
 } // unnamed namespace
 
+////////////////////////////////////////////////////////////////////////////////
+// LibraryManipulator
+////////////////////////////////////////////////////////////////////////////////
+
+LibraryManipulator::LibraryManipulator(Library* library)
+  : library(*library)
+{}
+
+LibraryManipulator::~LibraryManipulator()
+{}
+
+bool LibraryManipulator::addBookToLibrary(const Book& book)
+{
+  const auto ret = library.addBook(book);
+  if ( ret ) {
+    bookWasAddedToLibrary(book);
+  }
+  return ret;
+}
+
+void LibraryManipulator::addBookmarkToLibrary(const Bookmark& bookmark)
+{
+  library.addBookmark(bookmark);
+  bookmarkWasAddedToLibrary(bookmark);
+}
+
+void LibraryManipulator::bookWasAddedToLibrary(const Book& book)
+{
+}
+
+void LibraryManipulator::bookmarkWasAddedToLibrary(const Bookmark& bookmark)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Manager
+////////////////////////////////////////////////////////////////////////////////
+
 /* Constructor */
 Manager::Manager(LibraryManipulator* manipulator):
   writableLibraryPath(""),
@@ -46,7 +84,7 @@ Manager::Manager(LibraryManipulator* manipulator):
 
 Manager::Manager(Library* library) :
   writableLibraryPath(""),
-  manipulator(new DefaultLibraryManipulator(library))
+  manipulator(new LibraryManipulator(library))
 {
 }