225 lines
8.2 KiB
Java
225 lines
8.2 KiB
Java
/*
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* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of JSR-310 nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package java.time;
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import java.io.DataInput;
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import java.io.DataOutput;
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import java.io.IOException;
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import java.io.InvalidObjectException;
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import java.io.ObjectInputStream;
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import java.io.Serializable;
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import java.time.zone.ZoneRules;
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import java.time.zone.ZoneRulesException;
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import java.time.zone.ZoneRulesProvider;
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import java.util.Objects;
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/**
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* A geographical region where the same time-zone rules apply.
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* <p>
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* Time-zone information is categorized as a set of rules defining when and
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* how the offset from UTC/Greenwich changes. These rules are accessed using
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* identifiers based on geographical regions, such as countries or states.
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* The most common region classification is the Time Zone Database (TZDB),
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* which defines regions such as 'Europe/Paris' and 'Asia/Tokyo'.
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* <p>
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* The region identifier, modeled by this class, is distinct from the
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* underlying rules, modeled by {@link ZoneRules}.
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* The rules are defined by governments and change frequently.
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* By contrast, the region identifier is well-defined and long-lived.
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* This separation also allows rules to be shared between regions if appropriate.
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*
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* @implSpec
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* This class is immutable and thread-safe.
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*
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* @since 1.8
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*/
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final class ZoneRegion extends ZoneId implements Serializable {
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/**
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* Serialization version.
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*/
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@java.io.Serial
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private static final long serialVersionUID = 8386373296231747096L;
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/**
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* The time-zone ID, not null.
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*/
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private final String id;
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/**
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* The time-zone rules, null if zone ID was loaded leniently.
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*/
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private final transient ZoneRules rules;
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/**
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* Obtains an instance of {@code ZoneId} from an identifier.
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*
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* @param zoneId the time-zone ID, not null
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* @param checkAvailable whether to check if the zone ID is available
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* @return the zone ID, not null
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* @throws DateTimeException if the ID format is invalid
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* @throws ZoneRulesException if checking availability and the ID cannot be found
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*/
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static ZoneRegion ofId(String zoneId, boolean checkAvailable) {
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Objects.requireNonNull(zoneId, "zoneId");
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checkName(zoneId);
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ZoneRules rules = null;
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try {
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// always attempt load for better behavior after deserialization
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rules = ZoneRulesProvider.getRules(zoneId, true);
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} catch (ZoneRulesException ex) {
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if (checkAvailable) {
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throw ex;
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}
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}
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return new ZoneRegion(zoneId, rules);
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}
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/**
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* Checks that the given string is a legal ZondId name.
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*
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* @param zoneId the time-zone ID, not null
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* @throws DateTimeException if the ID format is invalid
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*/
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private static void checkName(String zoneId) {
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int n = zoneId.length();
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if (n < 2) {
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throw new DateTimeException("Invalid ID for region-based ZoneId, invalid format: " + zoneId);
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}
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for (int i = 0; i < n; i++) {
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char c = zoneId.charAt(i);
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if (c >= 'a' && c <= 'z') continue;
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if (c >= 'A' && c <= 'Z') continue;
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if (c == '/' && i != 0) continue;
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if (c >= '0' && c <= '9' && i != 0) continue;
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if (c == '~' && i != 0) continue;
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if (c == '.' && i != 0) continue;
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if (c == '_' && i != 0) continue;
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if (c == '+' && i != 0) continue;
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if (c == '-' && i != 0) continue;
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throw new DateTimeException("Invalid ID for region-based ZoneId, invalid format: " + zoneId);
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}
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}
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//-------------------------------------------------------------------------
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/**
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* Constructor.
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*
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* @param id the time-zone ID, not null
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* @param rules the rules, null for lazy lookup
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*/
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ZoneRegion(String id, ZoneRules rules) {
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this.id = id;
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this.rules = rules;
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}
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//-----------------------------------------------------------------------
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@Override
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public String getId() {
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return id;
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}
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@Override
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public ZoneRules getRules() {
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// additional query for group provider when null allows for possibility
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// that the provider was updated after the ZoneId was created
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return (rules != null ? rules : ZoneRulesProvider.getRules(id, false));
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}
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//-----------------------------------------------------------------------
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/**
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* Writes the object using a
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* <a href="{@docRoot}/serialized-form.html#java.time.Ser">dedicated serialized form</a>.
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* @serialData
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* <pre>
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* out.writeByte(7); // identifies a ZoneId (not ZoneOffset)
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* out.writeUTF(zoneId);
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* </pre>
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*
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* @return the instance of {@code Ser}, not null
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*/
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@java.io.Serial
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private Object writeReplace() {
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return new Ser(Ser.ZONE_REGION_TYPE, this);
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}
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/**
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* Defend against malicious streams.
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*
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* @param s the stream to read
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* @throws InvalidObjectException always
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*/
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@java.io.Serial
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private void readObject(ObjectInputStream s) throws InvalidObjectException {
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throw new InvalidObjectException("Deserialization via serialization delegate");
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}
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@Override
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void write(DataOutput out) throws IOException {
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out.writeByte(Ser.ZONE_REGION_TYPE);
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writeExternal(out);
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}
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void writeExternal(DataOutput out) throws IOException {
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out.writeUTF(id);
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}
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static ZoneId readExternal(DataInput in) throws IOException {
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String id = in.readUTF();
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return ZoneId.of(id, false);
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}
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}
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