/*
* JBoss, Home of Professional Open Source
* Copyright 2011, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.jboss.seam.international.datetimezone;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Set;
import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Produces;
import org.jboss.solder.core.Requires;
import org.joda.time.DateTimeZone;
/**
* <p>
* Seam component that provides a list of time zones, limited to time zones with IDs in the form Continent/Place, excluding
* deprecated three-letter time zone IDs. The time zones returned have a fixed offset from UTC, which takes daylight savings
* time into account. For example, Europe/Amsterdam is UTC+1; in winter this is GMT+1 and in summer GMT+2.
* </p>
* <p/>
* <p>
* The time zone objects returned are wrapped in an implementation of TimeZone that provides a more friendly interface for
* accessing the time zone information. In particular, this type provides a more bean-friend property for the time zone id (id
* than ID) and provides a convenience property named label that formats the time zone for display in the UI. This wrapper can
* be disabled by setting the component property wrap to false.
* </p>
*
* @author Peter Hilton, Lunatech Research
* @author Dan Allen
*/
@Requires({"org.joda.time.DateTimeZone"})
@ApplicationScoped
public class AvailableDateTimeZones {
private static final String TIMEZONE_ID_PREFIXES = "^(Africa|America|Asia|Atlantic|Australia|Europe|Indian|Pacific)/.*";
@Produces
private List<ForwardingDateTimeZone> dateTimeZones = null;
@SuppressWarnings("unchecked")
@PostConstruct
public void init() {
dateTimeZones = new ArrayList<ForwardingDateTimeZone>();
final Set timeZoneIds = DateTimeZone.getAvailableIDs();
for (Object object : timeZoneIds) {
String id = (String) object;
if (id.matches(TIMEZONE_ID_PREFIXES)) {
final DateTimeZone dtz = DateTimeZone.forID(id);
dateTimeZones.add(new ForwardingDateTimeZone(id) {
@Override
protected DateTimeZone delegate() {
return dtz;
}
});
}
}
Collections.sort(dateTimeZones, new Comparator<ForwardingDateTimeZone>() {
public int compare(final ForwardingDateTimeZone a, final ForwardingDateTimeZone b) {
return a.getID().compareTo(b.getID());
}
});
dateTimeZones = Collections.unmodifiableList(dateTimeZones);
}
}