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/*
* Copyright 2018 Gerald Curley
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.opsmatters.core.util;
import java.util.TimeZone;
import java.util.Vector;
import java.util.Comparator;
import java.util.Collections;
import java.util.concurrent.TimeUnit;
/**
* A wrapper class to store and display a timezone.
*
* @author Gerald Curley (opsmatters)
*/
public class AppTimeZone
{
private TimeZone tz;
private String name = "";
private static AppTimeZone[] timezones = null;
private static String[] Ids = null;
private static String[] names = null;
// Reduced list of "main" timezones
public static String[] TIMEZONES =
{
"Africa/Johannesburg",
//"America/Argentina/Buenos_Aires",
"America/Lima",
"America/Montevideo",
"Asia/Calcutta",
"Asia/Istanbul",
"Asia/Qatar",
"Asia/Tel_Aviv",
"Asia/Tokyo",
"Australia/North",
"Australia/South",
"Australia/Sydney",
"Australia/West",
"Brazil/East",
"Canada/Atlantic",
"Canada/Eastern",
"Canada/Central",
"Canada/Mountain",
"Canada/Newfoundland",
"Canada/Pacific",
"Chile/Continental",
"Europe/Amsterdam",
"Europe/Belfast",
"Europe/Berlin",
"Europe/Brussels",
"Europe/Bucharest",
"Europe/Budapest",
"Europe/Dublin",
"Europe/Lisbon",
"Europe/London",
"Europe/Madrid",
"Europe/Paris",
"Europe/Rome",
"Europe/Vienna",
"Europe/Zurich",
"Europe/Warsaw",
"Mexico/BajaNorte",
"Mexico/BajaSur",
"Mexico/General",
"Pacific/Auckland",
"US/Central",
"US/Eastern",
"US/Mountain",
"US/Pacific",
"Greenwich",
"Universal",
};
/**
* Constructor that takes a timezone.
* @param t The timezone
*/
public AppTimeZone(TimeZone t)
{
tz = t;
name = getDisplayName();
}
/**
* Returns the id of the timezone.
* @return The id of the timezone
*/
public String getId()
{
return tz.getID();
}
/**
* Returns the offset in milliseconds of the timezone.
* @return The offset in milliseconds of the timezone
*/
public int getRawOffset()
{
return tz.getRawOffset();
}
/**
* Returns the name of the timezone.
* @return The name of the timezone
*/
public String getName()
{
return name;
}
/**
* Returns the string value of the timezone.
*/
public String toString()
{
return getName();
}
/**
* Returns the timezone wrapped by this object.
* @return The timezone wrapped by this object
*/
public TimeZone getTimeZone()
{
return tz;
}
/**
* Returns the set of cached timezones.
* @return The set of cached timezones
*/
public static AppTimeZone[] getAppTimeZones()
{
return timezones;
}
/**
* Returns the set of IDs for the cached timezones.
* @return The set of IDs for the cached timezones
*/
public static String[] getIds()
{
return Ids;
}
/**
* Returns the set of names for the cached timezones.
* @return The set of names for the cached timezones
*/
public static String[] getNames()
{
return names;
}
/**
* Returns the cached timezone with the given name.
* @param name The name of the timezone
* @return The cached timezone with the given name
*/
public static TimeZone getTimeZone(String name)
{
TimeZone ret = null;
if(timezones != null)
{
for(int i = 0; i < timezones.length && ret == null; i++)
{
if(timezones[i].getName().equals(name))
ret = timezones[i].getTimeZone();
}
}
return ret;
}
/**
* Returns the cached timezone with the given ID.
* @param id The id of the timezone
* @return The cached timezone with the given ID
*/
public static TimeZone getTimeZoneById(String id)
{
TimeZone ret = null;
if(timezones != null)
{
for(int i = 0; i < timezones.length && ret == null; i++)
{
if(timezones[i].getId().equals(id))
ret = timezones[i].getTimeZone();
}
}
return ret;
}
/**
* Returns the cached timezone with the given ID ignoring case.
* @param id The id of the timezone
* @return The cached timezone with the given ID
*/
public static TimeZone getTimeZoneByIdIgnoreCase(String id)
{
TimeZone ret = null;
if(timezones != null)
{
id = id.toLowerCase();
for(int i = 0; i < timezones.length && ret == null; i++)
{
if(timezones[i].getId().toLowerCase().equals(id))
ret = timezones[i].getTimeZone();
}
}
return ret;
}
/**
* Returns the display name of the timezone.
* @return The display name of the timezone
*/
private String getDisplayName()
{
long hours = TimeUnit.MILLISECONDS.toHours(tz.getRawOffset());
long minutes = Math.abs(TimeUnit.MILLISECONDS.toMinutes(tz.getRawOffset())
-TimeUnit.HOURS.toMinutes(hours));
return String.format("(GMT%+d:%02d) %s", hours, minutes, tz.getID());
}
static
{
// Cache all the available timezones
Vector v = new Vector();
//String[] ids = TimeZone.getAvailableIDs();
String[] ids = TIMEZONES;
for(int i = 0; i < ids.length; i++)
{
String id = ids[i];
if((id.length() > 3) && !id.startsWith("Etc"))
{
TimeZone tz = TimeZone.getTimeZone(id);
String tzName = tz.getDisplayName();
// Don't include zones with generic "GMT+n" descriptions.
if(!tzName.startsWith("GMT-") && !tzName.startsWith("GMT+"))
v.addElement(new AppTimeZone(tz));
}
}
Collections.sort(v, new Comparator()
{
public int compare(Object a, Object b)
{
AppTimeZone tz1 = (AppTimeZone)a;
AppTimeZone tz2 = (AppTimeZone)b;
int offset1 = tz1.getRawOffset();
int offset2 = tz2.getRawOffset();
if(offset1 == offset2)
return tz1.getId().compareTo(tz2.getId());
else if(offset1 > offset2)
return 1;
else
return -1;
}
});
AppTimeZone[] ret = new AppTimeZone[v.size()];
timezones = (AppTimeZone[])v.toArray(ret);
Ids = new String[v.size()+1];
names = new String[v.size()+1];
Ids[0] = "";
names[0] = "";
for(int i = 0; i < v.size(); i++)
{
Ids[i+1] = timezones[i].getId();
names[i+1] = timezones[i].getName();
}
}
}
