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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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/*
*
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*
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*
* Copyright (c) 2009-2012, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
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* * Neither the name of JSR-310 nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package java.time.zone;
import java.io.
ByteArrayInputStream;
import java.io.
BufferedInputStream;
import java.io.
DataInputStream;
import java.io.
File;
import java.io.
FileInputStream;
import java.io.
IOException;
import java.io.
StreamCorruptedException;
import java.util.
Arrays;
import java.util.
HashSet;
import java.util.
List;
import java.util.
Map;
import java.util.
NavigableMap;
import java.util.
Objects;
import java.util.
Set;
import java.util.
TreeMap;
import java.util.concurrent.
ConcurrentHashMap;
/**
* Loads time-zone rules for 'TZDB'.
*
* @since 1.8
*/
final class
TzdbZoneRulesProvider extends
ZoneRulesProvider {
/**
* All the regions that are available.
*/
private
List<
String>
regionIds;
/**
* Version Id of this tzdb rules
*/
private
String versionId;
/**
* Region to rules mapping
*/
private final
Map<
String,
Object>
regionToRules = new
ConcurrentHashMap<>();
/**
* Creates an instance.
* Created by the {@code ServiceLoader}.
*
* @throws ZoneRulesException if unable to load
*/
public
TzdbZoneRulesProvider() {
try {
String libDir =
System.
getProperty("java.home") +
File.
separator + "lib";
try (
DataInputStream dis = new
DataInputStream(
new
BufferedInputStream(new
FileInputStream(
new
File(
libDir, "tzdb.dat"))))) {
load(
dis);
}
} catch (
Exception ex) {
throw new
ZoneRulesException("Unable to load TZDB time-zone rules",
ex);
}
}
@
Override
protected
Set<
String>
provideZoneIds() {
return new
HashSet<>(
regionIds);
}
@
Override
protected
ZoneRules provideRules(
String zoneId, boolean
forCaching) {
// forCaching flag is ignored because this is not a dynamic provider
Object obj =
regionToRules.
get(
zoneId);
if (
obj == null) {
throw new
ZoneRulesException("Unknown time-zone ID: " +
zoneId);
}
try {
if (
obj instanceof byte[]) {
byte[]
bytes = (byte[])
obj;
DataInputStream dis = new
DataInputStream(new
ByteArrayInputStream(
bytes));
obj =
Ser.
read(
dis);
regionToRules.
put(
zoneId,
obj);
}
return (
ZoneRules)
obj;
} catch (
Exception ex) {
throw new
ZoneRulesException("Invalid binary time-zone data: TZDB:" +
zoneId + ", version: " +
versionId,
ex);
}
}
@
Override
protected
NavigableMap<
String,
ZoneRules>
provideVersions(
String zoneId) {
TreeMap<
String,
ZoneRules>
map = new
TreeMap<>();
ZoneRules rules =
getRules(
zoneId, false);
if (
rules != null) {
map.
put(
versionId,
rules);
}
return
map;
}
/**
* Loads the rules from a DateInputStream, often in a jar file.
*
* @param dis the DateInputStream to load, not null
* @throws Exception if an error occurs
*/
private void
load(
DataInputStream dis) throws
Exception {
if (
dis.
readByte() != 1) {
throw new
StreamCorruptedException("File format not recognised");
}
// group
String groupId =
dis.
readUTF();
if ("TZDB".
equals(
groupId) == false) {
throw new
StreamCorruptedException("File format not recognised");
}
// versions
int
versionCount =
dis.
readShort();
for (int
i = 0;
i <
versionCount;
i++) {
versionId =
dis.
readUTF();
}
// regions
int
regionCount =
dis.
readShort();
String[]
regionArray = new
String[
regionCount];
for (int
i = 0;
i <
regionCount;
i++) {
regionArray[
i] =
dis.
readUTF();
}
regionIds =
Arrays.
asList(
regionArray);
// rules
int
ruleCount =
dis.
readShort();
Object[]
ruleArray = new
Object[
ruleCount];
for (int
i = 0;
i <
ruleCount;
i++) {
byte[]
bytes = new byte[
dis.
readShort()];
dis.
readFully(
bytes);
ruleArray[
i] =
bytes;
}
// link version-region-rules
for (int
i = 0;
i <
versionCount;
i++) {
int
versionRegionCount =
dis.
readShort();
regionToRules.
clear();
for (int
j = 0;
j <
versionRegionCount;
j++) {
String region =
regionArray[
dis.
readShort()];
Object rule =
ruleArray[
dis.
readShort() & 0xffff];
regionToRules.
put(
region,
rule);
}
}
}
@
Override
public
String toString() {
return "TZDB[" +
versionId + "]";
}
}