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Java example source code file (Simple.java)

This example Java source code file (Simple.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

backend, bufferedwriter, filewriter, list, map, rulerec, set, simpletimezone, sortedmap, string, treemap, treeset, util, zone

The Simple.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
 * questions.
 */

import  java.io.BufferedWriter;
import  java.io.File;
import  java.io.FileWriter;
import  java.io.IOException;
import  java.util.HashMap;
import  java.util.List;
import  java.util.Map;
import  java.util.Set;
import  java.util.SortedMap;
import  java.util.TreeMap;
import  java.util.TreeSet;

/**
 * <code>Simple generates TimeZoneData, which had been used as internal
 * data of TimeZone before J2SDK1.3.
 * Since J2SDK1.4 doesn't need TimeZoneData, this class is for maintenance
 * of old JDK release.
 */
class Simple extends BackEnd {

    /**
     * Zone records which are applied for given year.
     */
    private static Map<String,ZoneRec> lastZoneRecs = new HashMap<>();

    /**
     * Rule records which are applied for given year.
     */
    private static Map<String,List lastRules = new TreeMap<>();

    /**
     * zone IDs sorted by their GMT offsets. If zone's GMT
     * offset will change in the future, its last known offset is
     * used.
     */
    private SortedMap<Integer, Set zonesByOffset = new TreeMap<>();

    /**
     * Sets last Rule records and Zone records for given timezone to
     * each Map.
     *
     * @param tz Timezone object for each zone
     * @return always 0
     */
    int processZoneinfo(Timezone tz) {
        String zonename = tz.getName();

        lastRules.put(zonename, tz.getLastRules());
        lastZoneRecs.put(zonename, tz.getLastZoneRec());

        // Populate zonesByOffset. (Zones that will change their
        // GMT offsets are also added to zonesByOffset here.)
        int lastKnownOffset = tz.getRawOffset();
        Set<String> set = zonesByOffset.get(lastKnownOffset);
        if (set == null) {
            set = new TreeSet<>();
            zonesByOffset.put(lastKnownOffset, set);
        }
        set.add(zonename);

        return 0;
    }

    /**
     * Generates TimeZoneData to output SimpleTimeZone data.
     * @param map Mappings object which is generated by {@link Main#compile}.
     * @return 0 if no error occurred, otherwise 1.
     */
    int generateSrc(Mappings map) {
        try {
            File outD = new File(Main.getOutputDir());
            outD.mkdirs();

            FileWriter fw =
                new FileWriter(new File(outD, "TimeZoneData.java"), false);
            BufferedWriter out = new BufferedWriter(fw);

            out.write("import java.util.SimpleTimeZone;\n\n");
            out.write("    static SimpleTimeZone zones[] = {\n");

            Map<String,String> a = map.getAliases();
            List<Integer> roi = map.getRawOffsetsIndex();
            List<Set roit = map.getRawOffsetsIndexTable();

            int index = 0;
            for (int offset : zonesByOffset.keySet()) {
                int o = roi.get(index);
                Set<String> set = zonesByOffset.get(offset);
                if (offset == o) {
                    // Merge aliases into zonesByOffset
                    set.addAll(roit.get(index));
                }
                index++;

                for (String key : set) {
                    ZoneRec zrec;
                    String realname;
                    List<RuleRec> stz;
                    if ((realname = a.get(key)) != null) {
                        // if this alias is not targeted, ignore it.
                        if (!Zone.isTargetZone(key)) {
                            continue;
                        }
                        stz = lastRules.get(realname);
                        zrec = lastZoneRecs.get(realname);
                    } else {
                        stz = lastRules.get(key);
                        zrec = lastZoneRecs.get(key);
                    }

                    out.write("\t//--------------------------------------------------------------------\n");
                    String s = Time.toFormedString(offset);
                    out.write("\tnew SimpleTimeZone(" +
                        Time.toFormedString(offset) + ", \"" + key + "\"");
                    if (realname != null) {
                        out.write(" /* " + realname + " */");
                    }

                    if (stz == null) {
                        out.write("),\n");
                    } else {
                        RuleRec rr0 = stz.get(0);
                        RuleRec rr1 = stz.get(1);

                        out.write(",\n\t  " + Month.toString(rr0.getMonthNum()) +
                                  ", " + rr0.getDay().getDayForSimpleTimeZone() + ", " +
                                  rr0.getDay().getDayOfWeekForSimpleTimeZone() + ", " +
                                  Time.toFormedString((int)rr0.getTime().getTime()) + ", " +
                                  rr0.getTime().getTypeForSimpleTimeZone() + ",\n" +

                                  "\t  " + Month.toString(rr1.getMonthNum()) + ", " +
                                  rr1.getDay().getDayForSimpleTimeZone() + ", " +
                                  rr1.getDay().getDayOfWeekForSimpleTimeZone() + ", " +
                                  Time.toFormedString((int)rr1.getTime().getTime())+ ", " +
                                  rr1.getTime().getTypeForSimpleTimeZone() + ",\n" +

                                  "\t  " + Time.toFormedString(rr0.getSave()) + "),\n");

                        out.write("\t// " + rr0.getLine() + "\n");
                        out.write("\t// " + rr1.getLine() + "\n");
                    }

                    String zline = zrec.getLine();
                    if (zline.indexOf("Zone") == -1) {
                        zline = "Zone " + key + "\t" + zline.trim();
                    }
                    out.write("\t// " + zline + "\n");
                }
            }
            out.write("    };\n");

            out.close();
            fw.close();
        } catch(IOException e) {
            Main.panic("IO error: "+e.getMessage());
            return 1;
        }

        return 0;
    }
}

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