Here you can find the source of verifyZoneId(String zoneId)
public static ZoneId verifyZoneId(String zoneId)
//package com.java2s; /*//from ww w . j a va 2 s. com * Copyright (C) 2000 - 2018 Silverpeas * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * As a special exception to the terms and conditions of version 3.0 of * the GPL, you may redistribute this Program in connection with Free/Libre * Open Source Software ("FLOSS") applications as described in Silverpeas's * FLOSS exception. You should have received a copy of the text describing * the FLOSS exception, and it is also available here: * "https://www.silverpeas.org/legal/floss_exception.html" * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.time.ZoneId; import java.util.ArrayList; import java.util.List; public class Main { private static List<String> zoneIds = new ArrayList<>(); private static ZoneId defaultZoneId; /** * Verifies if the given user zone id is handled by the server. * @return the given user zone id if it is handled by the server, the default user zone id * otherwise. */ public static ZoneId verifyZoneId(String zoneId) { if (zoneIds.contains(zoneId)) { return ZoneId.of(zoneId); } return getDefaultZoneId(); } /** * Returns the default zone id used dor user interface (UI) * @return an instance of {@link ZoneId}. */ public static ZoneId getDefaultZoneId() { return defaultZoneId; } }