/**
* 根据设置的参数构造相应的 {@code Fetcher} 对象。<br>
* 构造完成后，将会重置该 {@code FetcherBuilder}。<br>
* 如果参数未设置或设置不全将会抛出 {@code IllegalStateException} 异常。
*
* @return {@code Fetcher} 对象
* @throws IOException 构造失败
*/
public Fetcher build() throws IOException {
try {
requireNonNull(site, "The parameter 'site' haven't been set yet.");
requireNonNull(page, "The parameter 'page' haven't been set yet.");
} catch (NullPointerException e) {
throw new IllegalStateException(e);
}
if (isNullOrEmpty(userAgent)) userAgent = UserAgent.getUserAgent();
if (site.equals("*")) site = matchSiteFromPage(page);
Fetcher fetcher;
switch (site) {
case "uta-net.com":
fetcher = new UtaNetFetcher(page, userAgent);
break;
case "j-lyric.net":
fetcher = new JLyricFetcher(page, userAgent);
break;
case "utamap.com":
fetcher = new UtaMapFetcher(page, userAgent);
break;
case "kasi-time.com":
fetcher = new KasiTimeFetcher(page, userAgent);
break;
case "kashinavi.com":
fetcher = new KashiNaviFetcher(page, userAgent);
break;
case "kget.jp":
fetcher = new KGetFetcher(page, userAgent);
break;
case "utaten.com":
fetcher = new UtaTenFetcher(page, userAgent);
break;
case "animap.jp":
fetcher = new AniMapFetcher(page, userAgent);
break;
case "evesta.jp":
fetcher = new EvestaFetcher(page, userAgent);
break;
case "jtw.zaq.ne.jp/animesong":
fetcher = new AnimeSongFetcher(page, userAgent);
break;
case "joysound.com":
fetcher = new JoySoundFetcher(page, userAgent);
break;
case "petitlyrics.com":
fetcher = new PetitLyricsFetcher(page, userAgent);
break;
default:
throw new IllegalArgumentException("Unable to resolve the parameter 'site': " + site);
}
return fetcher;
}
