more methods in AbstractLibrary

src/org/geometerplus/android/fbreader/libraryService/LibraryShadow.java

@@ -50,6 +50,20 @@ public class LibraryShadow extends AbstractLibrary {
 		// TODO: implement
 	}
 
+	public Book getRecentBook() {
+		// TODO: implement
+		return null;
+	}
+
+	public Book getPreviousBook() {
+		// TODO: implement
+		return null;
+	}
+
+	public void addBookToRecentList(Book book) {
+		// TODO: implement
+	}
+
 	@Override
 	public boolean isBookInFavorites(Book book) {
 		// TODO: implement

src/org/geometerplus/fbreader/library/AbstractLibrary.java

@@ -61,6 +61,10 @@ public abstract class AbstractLibrary {
 	public abstract boolean canRemoveBookFile(Book book);
 	public abstract void removeBook(Book book, int removeMode);
 
+	public abstract Book getRecentBook();
+	public abstract Book getPreviousBook();
+	public abstract void addBookToRecentList(Book book);
+
 	public abstract boolean isBookInFavorites(Book book);
 	public abstract void addBookToFavorites(Book book);
 	public abstract void removeBookFromFavorites(Book book);

src/org/geometerplus/fbreader/library/Library.java

@@ -427,11 +427,13 @@ public final class Library extends AbstractLibrary {
 		return myStatusMask == 0;
 	}
 
+	@Override
 	public Book getRecentBook() {
 		List<Long> recentIds = myDatabase.loadRecentBookIds();
 		return recentIds.size() > 0 ? Book.getById(recentIds.get(0)) : null;
 	}
 
+	@Override
 	public Book getPreviousBook() {
 		List<Long> recentIds = myDatabase.loadRecentBookIds();
 		return recentIds.size() > 1 ? Book.getById(recentIds.get(1)) : null;
@@ -492,6 +494,7 @@ public final class Library extends AbstractLibrary {
 		}
 	}
 
+	@Override
 	public void addBookToRecentList(Book book) {
 		final List<Long> ids = myDatabase.loadRecentBookIds();
 		final Long bookId = book.getId();