platform-independent code has been moved to non-android directory

src/org/geometerplus/android/fbreader/library/BaseActivity.java

@@ -167,41 +167,8 @@ abstract class BaseActivity extends ListActivity implements View.OnCreateContext
 	}
 
 	boolean isTreeSelected(FBTree tree) {
-		if (mySelectedBook == null) {
-			return false;
-		}
-
-		if (((LibraryTree)tree).containsBook(mySelectedBook)) {
-			return true;
-		}
-
-		final Book book = ((LibraryTree)tree).getBook();
-		if (book != null) {
-			return mySelectedBook.equals(book);
-		} else if (tree instanceof SeriesTree) {
-			final SeriesInfo info = mySelectedBook.getSeriesInfo();
-			final String series = ((SeriesTree)tree).Series;
-			return info != null && series != null && series.equals(info.Name);
-		} else if (tree instanceof FileTree) {
-			final FileTree fileTree = (FileTree)tree;
-			if (!fileTree.isSelectable()) {
-				return false;
-			}
-			final ZLFile file = fileTree.getFile();
-			String prefix = file.getPath();
-			if (file.isDirectory()) {
-				if (!prefix.endsWith("/")) {
-					prefix += '/';
-				}
-			} else if (file.isArchive()) {
-				prefix += ':';
-			} else {
-				return false;
-			}
-			return mySelectedBookPath.startsWith(prefix);
-		}
-
-		return false;
+		final LibraryTree lTree = (LibraryTree)tree;
+		return lTree.isSelectable() && lTree.containsBook(mySelectedBook);
 	}
 
 	protected void openBook(Book book) {

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

@@ -69,4 +69,9 @@ public class BookTree extends LibraryTree {
 	protected ZLImage createCover() {
 		return Library.getCover(Book.File);
 	}
+
+	@Override
+	public boolean containsBook(Book book) {
+		return book != null && book.equals(Book);
+	}
 }

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

@@ -91,6 +91,7 @@ public class FileTree extends LibraryTree {
 		return null;
 	}
 
+	@Override
 	public boolean isSelectable() {
 		return myIsSelectable;
 	}
@@ -109,6 +110,24 @@ public class FileTree extends LibraryTree {
 		return Book.getByFile(myFile);
 	}
 
+	@Override
+	public boolean containsBook(Book book) {
+		if (book == null) {
+			return false;
+		}
+		if (myFile.isDirectory()) {
+			String prefix = myFile.getPath();
+			if (!prefix.endsWith("/")) {
+				prefix += "/";
+			}
+			return book.File.getPath().startsWith(prefix);
+		} else if (myFile.isArchive()) {
+			return book.File.getPath().startsWith(myFile.getPath() + ":");
+		} else {
+			return book.equals(getBook());
+		}
+	}
+
 	@Override
 	public Status getOpeningStatus() {
 		if (!myFile.isReadable()) {

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

@@ -44,6 +44,10 @@ public abstract class LibraryTree extends FBTree {
 		return false;
 	}
 
+	public boolean isSelectable() {
+		return true;
+	}
+
 	TagTree createTagSubTree(Tag tag) {
 		return new TagTree(this, tag);
 	}

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

@@ -69,4 +69,9 @@ public class RootTree extends LibraryTree {
 	public void waitForOpening() {
 		myLibrary.waitForState(Library.STATE_FULLY_INITIALIZED);
 	}
+
+	@Override
+	public boolean isSelectable() {
+		return false;
+	}
 }

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

@@ -40,4 +40,13 @@ public final class SeriesTree extends LibraryTree {
 	BookTree createBookInSeriesSubTree(Book book) {
 		return new BookInSeriesTree(this, book);
 	}
+
+	@Override
+	public boolean containsBook(Book book) {
+		if (book == null) {
+			return false;
+		}
+		final SeriesInfo info = book.getSeriesInfo();
+		return info != null && Series.equals(info.Name);
+	}
 }