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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Copyright (c) 2009-2012, Stephen Colebourne & Michael Nascimento Santos
*
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package java.time.zone;
import java.io.ByteArrayInputStream;
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 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 + "]";
}
}