/*

 * Copyright (c) 2000, 2004, 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.BufferedReader;

import java.io.FileReader;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Set;

import java.util.StringTokenizer;

/**

 * Zone holds information corresponding to a "Zone" part of a time

 * zone definition file.

 *

 * @since 1.4

 */

class Zone {

    // zone name (e.g., "America/Los_Angeles")

    private String name;

    // zone records

    private List<ZoneRec> list;

    // target zone names for this compilation

    private static Set<String> targetZones;

    /**

     * Constructs a Zone with the specified zone name.

     * @param name the zone name

     */

    Zone(String name) {

        this.name = name;

        list = new ArrayList<ZoneRec>();

    }

    /**

     * Reads time zone names to be generated, called "target zone

     * name", from the specified text file and creats an internal hash

     * table to keep those names. It's assumed that one text line

     * contains a zone name or comments if it starts with

     * '#'. Comments can't follow a zone name in a single line.

     * @param fileName the text file name

     */

    static void readZoneNames(String fileName) {

        if (fileName == null) {

            return;

        }

        BufferedReader in = null;

        try {

            FileReader fr = new FileReader(fileName);

            in = new BufferedReader(fr);

        } catch (FileNotFoundException e) {

            Main.panic("can't open file: " + fileName);

        }

        targetZones = new HashSet<String>();

        String line;

        try {

            while ((line = in.readLine()) != null) {

                line = line.trim();

                if (line.length() == 0 || line.charAt(0) == '#') {

                    continue;

                }

                if (!targetZones.add(line)) {

                    Main.warning("duplicated target zone name: " + line);

                }

            }

            in.close();

        } catch (IOException e) {

            Main.panic("IO error: "+e.getMessage());

        }

    }

    /**

     * Determines whether the specified zone is one of the target zones.

     * If no target zones are specified, this method always returns

     * true for any zone name.

     * @param zoneName the zone name

     * @return true if the specified name is a target zone.

     */

    static boolean isTargetZone(String zoneName) {

        if (targetZones == null) {

            return true;

        }

        return targetZones.contains(zoneName);

    }

    /**

     * Forces to add "MET" to the target zone table. This is because

     * there is a conflict between Java zone name "WET" and Olson zone

     * name.

     */

    static void addMET() {

        if (targetZones != null) {

            targetZones.add("MET");

        }

    }

    /**

     * @return the zone name

     */

    String getName() {

        return name;

    }

    /**

     * Adds the specified zone record to the zone record list.

     */

    void add(ZoneRec rec) {

        list.add(rec);

    }

    /**

     * @param index the index at which the zone record in the list is returned.

     * @return the zone record specified by the index.

     */

    ZoneRec get(int index) {

        return list.get(index);

    }

    /**

     * @return the size of the zone record list

     */

    int size() {

        return list.size();

    }

    /**

     * Resolves the reference to a rule in each zone record.

     * @param zi the Zoneinfo object with which the rule reference is

     * resolved.

     */

    void resolve(Zoneinfo zi) {

        for (int i = 0; i < list.size(); i++) {

            ZoneRec rec = list.get(i);

            rec.resolve(zi);

        }

    }

}