public void insert(String genre, String title) {
GenreNode genreToInsert = findGenreNode(genre);
TitleNode titleToInsert;
if (genreToInsert == null) {
// 장르 먼저 만든다.
genreToInsert = new GenreNode(genre);
GenreNode temp;
GenreNode position = findGenrePosition(genre);
temp = position.getNextGenre();
position.setNextGenre(genreToInsert);
genreToInsert.setNextGenre(temp);
}
if (genreToInsert.isExistTitle(title) == false) { // 장르가 있는 경우이다. 이때는 타이틀만 넣어주면 된다.
titleToInsert = new TitleNode(title);
TitleNode temp;
TitleNode position2 = genreToInsert.findTitlePosition(title);
temp = position2.getNextTitle();
position2.setNextTitle(titleToInsert);
titleToInsert.setNextTitle(temp);
}
}
public void delete(String genre, String title) {
GenreNode genreToDelete = findGenreNode(genre);
if (genreToDelete == null) return;
TitleNode titleToDelete = genreToDelete.findTitleNode(title);
if (titleToDelete == null) return;
TitleNode titlePrev = genreToDelete.findTitlePosition(title);
titlePrev.setNextTitle(titleToDelete.getNextTitle());
if (genreToDelete.getTitleHead().getNextTitle() == null) {
GenreNode genrePrev = findGenrePosition(genre);
genrePrev.setNextGenre(genreToDelete.getNextGenre());
}
}