Java example source code file (Zoneinfo.java)
The Zoneinfo.java Java example source code/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
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*/
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
/**
* Zoneinfo provides javazic compiler front-end functionality.
* @since 1.4
*/
class Zoneinfo {
private static final int minYear = 1900;
private static final int maxYear = 2037;
private static final long minTime = Time.getLocalTime(minYear, Month.JANUARY, 1, 0);
private static int startYear = minYear;
private static int endYear = maxYear;
/**
* True if javazic should generate a list of SimpleTimeZone
* instances for the SimpleTimeZone-based time zone support.
*/
static boolean isYearForTimeZoneDataSpecified = false;
/**
* Zone name to Zone mappings
*/
private Map<String,Zone> zones;
/**
* Rule name to Rule mappings
*/
private Map<String,Rule> rules;
/**
* Alias name to real name mappings
*/
private Map<String,String> aliases;
/**
* Constracts a Zoneinfo.
*/
Zoneinfo() {
zones = new HashMap<String,Zone>();
rules = new HashMap<String,Rule>();
aliases = new HashMap<String,String>();
}
/**
* Adds the given zone to the list of Zones.
* @param zone Zone to be added to the list.
*/
void add(Zone zone) {
String name = zone.getName();
zones.put(name, zone);
}
/**
* Adds the given rule to the list of Rules.
* @param rule Rule to be added to the list.
*/
void add(Rule rule) {
String name = rule.getName();
rules.put(name, rule);
}
/**
* Puts the specifid name pair to the alias table.
* @param name1 an alias time zone name
* @param name2 the real time zone of the alias name
*/
void putAlias(String name1, String name2) {
aliases.put(name1, name2);
}
/**
* Sets the given year for SimpleTimeZone list output.
* This method is called when the -S option is specified.
* @param year the year for which SimpleTimeZone list should be generated
*/
static void setYear(int year) {
setStartYear(year);
setEndYear(year);
isYearForTimeZoneDataSpecified = true;
}
/**
* Sets the start year.
* @param year the start year value
* @throws IllegalArgumentException if the specified year value is
* smaller than the minimum year or greater than the end year.
*/
static void setStartYear(int year) {
if (year < minYear || year > endYear) {
throw new IllegalArgumentException("invalid start year specified: " + year);
}
startYear = year;
}
/**
* @return the start year value
*/
static int getStartYear() {
return startYear;
}
/**
* Sets the end year.
* @param year the end year value
* @throws IllegalArgumentException if the specified year value is
* smaller than the start year or greater than the maximum year.
*/
static void setEndYear(int year) {
if (year < startYear || year > maxYear) {
throw new IllegalArgumentException();
}
endYear = year;
}
/**
* @return the end year value
*/
static int getEndYear() {
return endYear;
}
/**
* @return the minimum year value
*/
static int getMinYear() {
return minYear;
}
/**
* @return the maximum year value
*/
static int getMaxYear() {
return maxYear;
}
/**
* @return the alias table
*/
Map<String,String> getAliases() {
return aliases;
}
/**
* @return the Zone list
*/
Map<String,Zone> getZones() {
return zones;
}
/**
* @return a Zone specified by name.
* @param name a zone name
*/
Zone getZone(String name) {
return zones.get(name);
}
/**
* @return a Rule specified by name.
* @param name a rule name
*/
Rule getRule(String name) {
return rules.get(name);
}
private static String line;
private static int lineNum;
/**
* Parses the specified time zone data file and creates a Zoneinfo
* that has all Rules, Zones and Links (aliases) information.
* @param fname the time zone data file name
* @return a Zoneinfo object
*/
static Zoneinfo parse(String fname) {
BufferedReader in = null;
try {
FileReader fr = new FileReader(fname);
in = new BufferedReader(fr);
} catch (FileNotFoundException e) {
panic("can't open file: "+fname);
}
Zoneinfo zi = new Zoneinfo();
boolean continued = false;
Zone zone = null;
String l;
lineNum = 0;
try {
while ((line = in.readLine()) != null) {
lineNum++;
// skip blank and comment lines
if (line.length() == 0 || line.charAt(0) == '#') {
continue;
}
// trim trailing comments
int rindex = line.lastIndexOf('#');
if (rindex != -1) {
// take the data part of the line
l = line.substring(0, rindex);
} else {
l = line;
}
StringTokenizer tokens = new StringTokenizer(l);
if (!tokens.hasMoreTokens()) {
continue;
}
String token = tokens.nextToken();
if (continued || "Zone".equals(token)) {
if (zone == null) {
if (!tokens.hasMoreTokens()) {
panic("syntax error: zone no more token");
}
token = tokens.nextToken();
// if the zone name is in "GMT+hh" or "GMT-hh"
// format, ignore it due to spec conflict.
if (token.startsWith("GMT+") || token.startsWith("GMT-")) {
continue;
}
zone = new Zone(token);
} else {
// no way to push the current token back...
tokens = new StringTokenizer(l);
}
ZoneRec zrec = ZoneRec.parse(tokens);
zrec.setLine(line);
zone.add(zrec);
if ((continued = zrec.hasUntil()) == false) {
if (Zone.isTargetZone(zone.getName())) {
// zone.resolve(zi);
zi.add(zone);
}
zone = null;
}
} else if ("Rule".equals(token)) {
if (!tokens.hasMoreTokens()) {
panic("syntax error: rule no more token");
}
token = tokens.nextToken();
Rule rule = zi.getRule(token);
if (rule == null) {
rule = new Rule(token);
zi.add(rule);
}
RuleRec rrec = RuleRec.parse(tokens);
rrec.setLine(line);
rule.add(rrec);
} else if ("Link".equals(token)) {
// Link <newname>
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