sun.util.calendar.ZoneInfoFile Java Examples

private String[] getDisplayNameArray(String id, Locale locale) {
    Objects.requireNonNull(id);
    Objects.requireNonNull(locale);

    String[] ret =
        LocaleProviderAdapter.forType(type).getLocaleResources(locale).getTimeZoneNames(id);

    if (Objects.nonNull(ret) && type == LocaleProviderAdapter.Type.CLDR) {
        // check for CLDR's "no inheritance marker"
        for (int index = 0; index < ret.length; index++) {
            TimeZone tz = null;
            if (CLDR_NO_INHERITANCE_MARKER.equals(ret[index])) {
                if (Objects.isNull(tz)) {
                    tz = TimeZone.getTimeZone(id);
                }
                int offset = tz.getRawOffset();
                if (index == 3 || index == 4) { // daylight
                    offset += tz.getDSTSavings();
                }
                ret[index] = ZoneInfoFile.toCustomID(offset);
            }
        }
    }

    return ret;
}
 

private ZoneId toZoneId0() {
    String id = getID();
    TimeZone defaultZone = defaultTimeZone;
    // are we not defaultTimeZone but our id is equal to default's?
    if (defaultZone != this &&
        defaultZone != null && id.equals(defaultZone.getID())) {
        // delegate to default TZ which is effectively immutable
        return defaultZone.toZoneId();
    }
    // derive it ourselves
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

private String toGMTFormat(String id, boolean daylight, boolean isShort, Locale l) {
    TimeZone tz = ZoneInfoFile.getZoneInfo(id);
    int offset = (tz.getRawOffset() + (daylight ? tz.getDSTSavings() : 0)) / 60000;
    LocaleResources lr = LocaleProviderAdapter.forType(Type.CLDR).getLocaleResources(l);
    ResourceBundle fd = lr.getJavaTimeFormatData();

    if (offset == 0) {
        return fd.getString("timezone.gmtZeroFormat");
    } else {
        String gmtFormat = fd.getString("timezone.gmtFormat");
        String hourFormat = fd.getString("timezone.hourFormat");

        if (offset > 0) {
            hourFormat = hourFormat.substring(0, hourFormat.indexOf(";"));
        } else {
            hourFormat = hourFormat.substring(hourFormat.indexOf(";") + 1);
            offset = -offset;
        }
        hourFormat = hourFormat
            .replaceFirst("H+", (isShort ? "\\%1\\$d" : "\\%1\\$02d"))
            .replaceFirst("m+", "\\%2\\$02d");
        return MessageFormat.format(gmtFormat,
                String.format(l, hourFormat, offset / 60, offset % 60));
    }
}
 

private ZoneId toZoneId0() {
    String id = getID();
    TimeZone defaultZone = defaultTimeZone;
    // are we not defaultTimeZone but our id is equal to default's?
    if (defaultZone != this &&
        defaultZone != null && id.equals(defaultZone.getID())) {
        // delegate to default TZ which is effectively immutable
        return defaultZone.toZoneId();
    }
    // derive it ourselves
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Converts this {@code TimeZone} object to a {@code ZoneId}.
 *
 * @return a {@code ZoneId} representing the same time zone as this
 *         {@code TimeZone}
 * @since 1.8
 */
public ZoneId toZoneId() {
    String id = getID();
    if (ZoneInfoFile.useOldMapping() && id.length() == 3) {
        if ("EST".equals(id))
            return ZoneId.of("America/New_York");
        if ("MST".equals(id))
            return ZoneId.of("America/Denver");
        if ("HST".equals(id))
            return ZoneId.of("America/Honolulu");
    }
    return ZoneId.of(id, ZoneId.SHORT_IDS);
}
 

/**
 * Parses a custom time zone identifier and returns a corresponding zone.
 * This method doesn't support the RFC 822 time zone format. (e.g., +hhmm)
 *
 * @param id a string of the <a href="#CustomID">custom ID form</a>.
 * @return a newly created TimeZone with the given offset and
 * no daylight saving time, or null if the id cannot be parsed.
 */
private static final TimeZone parseCustomTimeZone(String id) {
    int length;

    // Error if the length of id isn't long enough or id doesn't
    // start with "GMT".
    if ((length = id.length()) < (GMT_ID_LENGTH + 2) ||
        id.indexOf(GMT_ID) != 0) {
        return null;
    }

    ZoneInfo zi;

    // First, we try to find it in the cache with the given
    // id. Even the id is not normalized, the returned ZoneInfo
    // should have its normalized id.
    zi = ZoneInfoFile.getZoneInfo(id);
    if (zi != null) {
        return zi;
    }

    int index = GMT_ID_LENGTH;
    boolean negative = false;
    char c = id.charAt(index++);
    if (c == '-') {
        negative = true;
    } else if (c != '+') {
        return null;
    }

    int hours = 0;
    int num = 0;
    int countDelim = 0;
    int len = 0;
    while (index < length) {
        c = id.charAt(index++);
        if (c == ':') {
            if (countDelim > 0) {
                return null;
            }
            if (len > 2) {
                return null;
            }
            hours = num;
            countDelim++;
            num = 0;
            len = 0;
            continue;
        }
        if (c < '0' || c > '9') {
            return null;
        }
        num = num * 10 + (c - '0');
        len++;
    }
    if (index != length) {
        return null;
    }
    if (countDelim == 0) {
        if (len <= 2) {
            hours = num;
            num = 0;
        } else {
            hours = num / 100;
            num %= 100;
        }
    } else {
        if (len != 2) {
            return null;
        }
    }
    if (hours > 23 || num > 59) {
        return null;
    }
    int gmtOffset =  (hours * 60 + num) * 60 * 1000;

    if (gmtOffset == 0) {
        zi = ZoneInfoFile.getZoneInfo(GMT_ID);
        if (negative) {
            zi.setID("GMT-00:00");
        } else {
            zi.setID("GMT+00:00");
        }
    } else {
        zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset);
    }
    return zi;
}
 

/**
 * Parses a custom time zone identifier and returns a corresponding zone.
 * This method doesn't support the RFC 822 time zone format. (e.g., +hhmm)
 *
 * @param id a string of the <a href="#CustomID">custom ID form</a>.
 * @return a newly created TimeZone with the given offset and
 * no daylight saving time, or null if the id cannot be parsed.
 */
private static final TimeZone parseCustomTimeZone(String id) {
    int length;

    // Error if the length of id isn't long enough or id doesn't
    // start with "GMT".
    if ((length = id.length()) < (GMT_ID_LENGTH + 2) ||
        id.indexOf(GMT_ID) != 0) {
        return null;
    }

    ZoneInfo zi;

    // First, we try to find it in the cache with the given
    // id. Even the id is not normalized, the returned ZoneInfo
    // should have its normalized id.
    zi = ZoneInfoFile.getZoneInfo(id);
    if (zi != null) {
        return zi;
    }

    int index = GMT_ID_LENGTH;
    boolean negative = false;
    char c = id.charAt(index++);
    if (c == '-') {
        negative = true;
    } else if (c != '+') {
        return null;
    }

    int hours = 0;
    int num = 0;
    int countDelim = 0;
    int len = 0;
    while (index < length) {
        c = id.charAt(index++);
        if (c == ':') {
            if (countDelim > 0) {
                return null;
            }
            if (len > 2) {
                return null;
            }
            hours = num;
            countDelim++;
            num = 0;
            len = 0;
            continue;
        }
        if (c < '0' || c > '9') {
            return null;
        }
        num = num * 10 + (c - '0');
        len++;
    }
    if (index != length) {
        return null;
    }
    if (countDelim == 0) {
        if (len <= 2) {
            hours = num;
            num = 0;
        } else {
            hours = num / 100;
            num %= 100;
        }
    } else {
        if (len != 2) {
            return null;
        }
    }
    if (hours > 23 || num > 59) {
        return null;
    }
    int gmtOffset =  (hours * 60 + num) * 60 * 1000;

    if (gmtOffset == 0) {
        zi = ZoneInfoFile.getZoneInfo(GMT_ID);
        if (negative) {
            zi.setID("GMT-00:00");
        } else {
            zi.setID("GMT+00:00");
        }
    } else {
        zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset);
    }
    return zi;
}
 

/**
 * Returns a name in the specified {@code style} of this {@code TimeZone}
 * suitable for presentation to the user in the specified {@code
 * locale}. If the specified {@code daylight} is {@code true}, a Daylight
 * Saving Time name is returned (even if this {@code TimeZone} doesn't
 * observe Daylight Saving Time). Otherwise, a Standard Time name is
 * returned.
 *
 * <p>When looking up a time zone name, the {@linkplain
 * ResourceBundle.Control#getCandidateLocales(String,Locale) default
 * <code>Locale</code> search path of <code>ResourceBundle</code>} derived
 * from the specified {@code locale} is used. (No {@linkplain
 * ResourceBundle.Control#getFallbackLocale(String,Locale) fallback
 * <code>Locale</code>} search is performed.) If a time zone name in any
 * {@code Locale} of the search path, including {@link Locale#ROOT}, is
 * found, the name is returned. Otherwise, a string in the
 * <a href="#NormalizedCustomID">normalized custom ID format</a> is returned.
 *
 * @param daylight {@code true} specifying a Daylight Saving Time name, or
 *                 {@code false} specifying a Standard Time name
 * @param style either {@link #LONG} or {@link #SHORT}
 * @param locale   the locale in which to supply the display name.
 * @return the human-readable name of this time zone in the given locale.
 * @exception IllegalArgumentException if {@code style} is invalid.
 * @exception NullPointerException if {@code locale} is {@code null}.
 * @since 1.2
 * @see java.text.DateFormatSymbols#getZoneStrings()
 */
public String getDisplayName(boolean daylight, int style, Locale locale) {
    if (style != SHORT && style != LONG) {
        throw new IllegalArgumentException("Illegal style: " + style);
    }
    String id = getID();
    String name = TimeZoneNameUtility.retrieveDisplayName(id, daylight, style, locale);
    if (name != null) {
        return name;
    }

    if (id.startsWith("GMT") && id.length() > 3) {
        char sign = id.charAt(3);
        if (sign == '+' || sign == '-') {
            return id;
        }
    }
    int offset = getRawOffset();
    if (daylight) {
        offset += getDSTSavings();
    }
    return ZoneInfoFile.toCustomID(offset);
}
 

/**
 * Returns a name in the specified {@code style} of this {@code TimeZone}
 * suitable for presentation to the user in the specified {@code
 * locale}. If the specified {@code daylight} is {@code true}, a Daylight
 * Saving Time name is returned (even if this {@code TimeZone} doesn't
 * observe Daylight Saving Time). Otherwise, a Standard Time name is
 * returned.
 *
 * <p>When looking up a time zone name, the {@linkplain
 * ResourceBundle.Control#getCandidateLocales(String,Locale) default
 * <code>Locale</code> search path of <code>ResourceBundle</code>} derived
 * from the specified {@code locale} is used. (No {@linkplain
 * ResourceBundle.Control#getFallbackLocale(String,Locale) fallback
 * <code>Locale</code>} search is performed.) If a time zone name in any
 * {@code Locale} of the search path, including {@link Locale#ROOT}, is
 * found, the name is returned. Otherwise, a string in the
 * <a href="#NormalizedCustomID">normalized custom ID format</a> is returned.
 *
 * @param daylight {@code true} specifying a Daylight Saving Time name, or
 *                 {@code false} specifying a Standard Time name
 * @param style either {@link #LONG} or {@link #SHORT}
 * @param locale   the locale in which to supply the display name.
 * @return the human-readable name of this time zone in the given locale.
 * @exception IllegalArgumentException if {@code style} is invalid.
 * @exception NullPointerException if {@code locale} is {@code null}.
 * @since 1.2
 * @see java.text.DateFormatSymbols#getZoneStrings()
 */
public String getDisplayName(boolean daylight, int style, Locale locale) {
    if (style != SHORT && style != LONG) {
        throw new IllegalArgumentException("Illegal style: " + style);
    }
    String id = getID();
    String name = TimeZoneNameUtility.retrieveDisplayName(id, daylight, style, locale);
    if (name != null) {
        return name;
    }

    if (id.startsWith("GMT") && id.length() > 3) {
        char sign = id.charAt(3);
        if (sign == '+' || sign == '-') {
            return id;
        }
    }
    int offset = getRawOffset();
    if (daylight) {
        offset += getDSTSavings();
    }
    return ZoneInfoFile.toCustomID(offset);
}
 

/**
 * Parses a custom time zone identifier and returns a corresponding zone.
 * This method doesn't support the RFC 822 time zone format. (e.g., +hhmm)
 *
 * @param id a string of the <a href="#CustomID">custom ID form</a>.
 * @return a newly created TimeZone with the given offset and
 * no daylight saving time, or null if the id cannot be parsed.
 */
private static final TimeZone parseCustomTimeZone(String id) {
    int length;

    // Error if the length of id isn't long enough or id doesn't
    // start with "GMT".
    if ((length = id.length()) < (GMT_ID_LENGTH + 2) ||
        id.indexOf(GMT_ID) != 0) {
        return null;
    }

    ZoneInfo zi;

    // First, we try to find it in the cache with the given
    // id. Even the id is not normalized, the returned ZoneInfo
    // should have its normalized id.
    zi = ZoneInfoFile.getZoneInfo(id);
    if (zi != null) {
        return zi;
    }

    int index = GMT_ID_LENGTH;
    boolean negative = false;
    char c = id.charAt(index++);
    if (c == '-') {
        negative = true;
    } else if (c != '+') {
        return null;
    }

    int hours = 0;
    int num = 0;
    int countDelim = 0;
    int len = 0;
    while (index < length) {
        c = id.charAt(index++);
        if (c == ':') {
            if (countDelim > 0) {
                return null;
            }
            if (len > 2) {
                return null;
            }
            hours = num;
            countDelim++;
            num = 0;
            len = 0;
            continue;
        }
        if (c < '0' || c > '9') {
            return null;
        }
        num = num * 10 + (c - '0');
        len++;
    }
    if (index != length) {
        return null;
    }
    if (countDelim == 0) {
        if (len <= 2) {
            hours = num;
            num = 0;
        } else {
            hours = num / 100;
            num %= 100;
        }
    } else {
        if (len != 2) {
            return null;
        }
    }
    if (hours > 23 || num > 59) {
        return null;
    }
    int gmtOffset =  (hours * 60 + num) * 60 * 1000;

    if (gmtOffset == 0) {
        zi = ZoneInfoFile.getZoneInfo(GMT_ID);
        if (negative) {
            zi.setID("GMT-00:00");
        } else {
            zi.setID("GMT+00:00");
        }
    } else {
        zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset);
    }
    return zi;
}
 

/**
 * Returns a name in the specified {@code style} of this {@code TimeZone}
 * suitable for presentation to the user in the specified {@code
 * locale}. If the specified {@code daylight} is {@code true}, a Daylight
 * Saving Time name is returned (even if this {@code TimeZone} doesn't
 * observe Daylight Saving Time). Otherwise, a Standard Time name is
 * returned.
 *
 * <p>When looking up a time zone name, the {@linkplain
 * ResourceBundle.Control#getCandidateLocales(String,Locale) default
 * <code>Locale</code> search path of <code>ResourceBundle</code>} derived
 * from the specified {@code locale} is used. (No {@linkplain
 * ResourceBundle.Control#getFallbackLocale(String,Locale) fallback
 * <code>Locale</code>} search is performed.) If a time zone name in any
 * {@code Locale} of the search path, including {@link Locale#ROOT}, is
 * found, the name is returned. Otherwise, a string in the
 * <a href="#NormalizedCustomID">normalized custom ID format</a> is returned.
 *
 * @param daylight {@code true} specifying a Daylight Saving Time name, or
 *                 {@code false} specifying a Standard Time name
 * @param style either {@link #LONG} or {@link #SHORT}
 * @param locale   the locale in which to supply the display name.
 * @return the human-readable name of this time zone in the given locale.
 * @exception IllegalArgumentException if {@code style} is invalid.
 * @exception NullPointerException if {@code locale} is {@code null}.
 * @since 1.2
 * @see java.text.DateFormatSymbols#getZoneStrings()
 */
public String getDisplayName(boolean daylight, int style, Locale locale) {
    if (style != SHORT && style != LONG) {
        throw new IllegalArgumentException("Illegal style: " + style);
    }
    String id = getID();
    String name = TimeZoneNameUtility.retrieveDisplayName(id, daylight, style, locale);
    if (name != null) {
        return name;
    }

    if (id.startsWith("GMT") && id.length() > 3) {
        char sign = id.charAt(3);
        if (sign == '+' || sign == '-') {
            return id;
        }
    }
    int offset = getRawOffset();
    if (daylight) {
        offset += getDSTSavings();
    }
    return ZoneInfoFile.toCustomID(offset);
}
 

/**
 * Returns a name in the specified {@code style} of this {@code TimeZone}
 * suitable for presentation to the user in the specified {@code
 * locale}. If the specified {@code daylight} is {@code true}, a Daylight
 * Saving Time name is returned (even if this {@code TimeZone} doesn't
 * observe Daylight Saving Time). Otherwise, a Standard Time name is
 * returned.
 *
 * <p>When looking up a time zone name, the {@linkplain
 * ResourceBundle.Control#getCandidateLocales(String,Locale) default
 * <code>Locale</code> search path of <code>ResourceBundle</code>} derived
 * from the specified {@code locale} is used. (No {@linkplain
 * ResourceBundle.Control#getFallbackLocale(String,Locale) fallback
 * <code>Locale</code>} search is performed.) If a time zone name in any
 * {@code Locale} of the search path, including {@link Locale#ROOT}, is
 * found, the name is returned. Otherwise, a string in the
 * <a href="#NormalizedCustomID">normalized custom ID format</a> is returned.
 *
 * @param daylight {@code true} specifying a Daylight Saving Time name, or
 *                 {@code false} specifying a Standard Time name
 * @param style either {@link #LONG} or {@link #SHORT}
 * @param locale   the locale in which to supply the display name.
 * @return the human-readable name of this time zone in the given locale.
 * @exception IllegalArgumentException if {@code style} is invalid.
 * @exception NullPointerException if {@code locale} is {@code null}.
 * @since 1.2
 * @see java.text.DateFormatSymbols#getZoneStrings()
 */
public String getDisplayName(boolean daylight, int style, Locale locale) {
    if (style != SHORT && style != LONG) {
        throw new IllegalArgumentException("Illegal style: " + style);
    }
    String id = getID();
    String name = TimeZoneNameUtility.retrieveDisplayName(id, daylight, style, locale);
    if (name != null) {
        return name;
    }

    if (id.startsWith("GMT") && id.length() > 3) {
        char sign = id.charAt(3);
        if (sign == '+' || sign == '-') {
            return id;
        }
    }
    int offset = getRawOffset();
    if (daylight) {
        offset += getDSTSavings();
    }
    return ZoneInfoFile.toCustomID(offset);
}
 

/**
 * Parses a custom time zone identifier and returns a corresponding zone.
 * This method doesn't support the RFC 822 time zone format. (e.g., +hhmm)
 *
 * @param id a string of the <a href="#CustomID">custom ID form</a>.
 * @return a newly created TimeZone with the given offset and
 * no daylight saving time, or null if the id cannot be parsed.
 */
private static final TimeZone parseCustomTimeZone(String id) {
    int length;

    // Error if the length of id isn't long enough or id doesn't
    // start with "GMT".
    if ((length = id.length()) < (GMT_ID_LENGTH + 2) ||
        id.indexOf(GMT_ID) != 0) {
        return null;
    }

    ZoneInfo zi;

    // First, we try to find it in the cache with the given
    // id. Even the id is not normalized, the returned ZoneInfo
    // should have its normalized id.
    zi = ZoneInfoFile.getZoneInfo(id);
    if (zi != null) {
        return zi;
    }

    int index = GMT_ID_LENGTH;
    boolean negative = false;
    char c = id.charAt(index++);
    if (c == '-') {
        negative = true;
    } else if (c != '+') {
        return null;
    }

    int hours = 0;
    int num = 0;
    int countDelim = 0;
    int len = 0;
    while (index < length) {
        c = id.charAt(index++);
        if (c == ':') {
            if (countDelim > 0) {
                return null;
            }
            if (len > 2) {
                return null;
            }
            hours = num;
            countDelim++;
            num = 0;
            len = 0;
            continue;
        }
        if (c < '0' || c > '9') {
            return null;
        }
        num = num * 10 + (c - '0');
        len++;
    }
    if (index != length) {
        return null;
    }
    if (countDelim == 0) {
        if (len <= 2) {
            hours = num;
            num = 0;
        } else {
            hours = num / 100;
            num %= 100;
        }
    } else {
        if (len != 2) {
            return null;
        }
    }
    if (hours > 23 || num > 59) {
        return null;
    }
    int gmtOffset =  (hours * 60 + num) * 60 * 1000;

    if (gmtOffset == 0) {
        zi = ZoneInfoFile.getZoneInfo(GMT_ID);
        if (negative) {
            zi.setID("GMT-00:00");
        } else {
            zi.setID("GMT+00:00");
        }
    } else {
        zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset);
    }
    return zi;
}
 

/**
 * Parses a custom time zone identifier and returns a corresponding zone.
 * This method doesn't support the RFC 822 time zone format. (e.g., +hhmm)
 *
 * @param id a string of the <a href="#CustomID">custom ID form</a>.
 * @return a newly created TimeZone with the given offset and
 * no daylight saving time, or null if the id cannot be parsed.
 */
private static final TimeZone parseCustomTimeZone(String id) {
    int length;

    // Error if the length of id isn't long enough or id doesn't
    // start with "GMT".
    if ((length = id.length()) < (GMT_ID_LENGTH + 2) ||
        id.indexOf(GMT_ID) != 0) {
        return null;
    }

    ZoneInfo zi;

    // First, we try to find it in the cache with the given
    // id. Even the id is not normalized, the returned ZoneInfo
    // should have its normalized id.
    zi = ZoneInfoFile.getZoneInfo(id);
    if (zi != null) {
        return zi;
    }

    int index = GMT_ID_LENGTH;
    boolean negative = false;
    char c = id.charAt(index++);
    if (c == '-') {
        negative = true;
    } else if (c != '+') {
        return null;
    }

    int hours = 0;
    int num = 0;
    int countDelim = 0;
    int len = 0;
    while (index < length) {
        c = id.charAt(index++);
        if (c == ':') {
            if (countDelim > 0) {
                return null;
            }
            if (len > 2) {
                return null;
            }
            hours = num;
            countDelim++;
            num = 0;
            len = 0;
            continue;
        }
        if (c < '0' || c > '9') {
            return null;
        }
        num = num * 10 + (c - '0');
        len++;
    }
    if (index != length) {
        return null;
    }
    if (countDelim == 0) {
        if (len <= 2) {
            hours = num;
            num = 0;
        } else {
            hours = num / 100;
            num %= 100;
        }
    } else {
        if (len != 2) {
            return null;
        }
    }
    if (hours > 23 || num > 59) {
        return null;
    }
    int gmtOffset =  (hours * 60 + num) * 60 * 1000;

    if (gmtOffset == 0) {
        zi = ZoneInfoFile.getZoneInfo(GMT_ID);
        if (negative) {
            zi.setID("GMT-00:00");
        } else {
            zi.setID("GMT+00:00");
        }
    } else {
        zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset);
    }
    return zi;
}
 

/**
 * Parses a custom time zone identifier and returns a corresponding zone.
 * This method doesn't support the RFC 822 time zone format. (e.g., +hhmm)
 *
 * @param id a string of the <a href="#CustomID">custom ID form</a>.
 * @return a newly created TimeZone with the given offset and
 * no daylight saving time, or null if the id cannot be parsed.
 */
private static final TimeZone parseCustomTimeZone(String id) {
    int length;

    // Error if the length of id isn't long enough or id doesn't
    // start with "GMT".
    if ((length = id.length()) < (GMT_ID_LENGTH + 2) ||
        id.indexOf(GMT_ID) != 0) {
        return null;
    }

    ZoneInfo zi;

    // First, we try to find it in the cache with the given
    // id. Even the id is not normalized, the returned ZoneInfo
    // should have its normalized id.
    zi = ZoneInfoFile.getZoneInfo(id);
    if (zi != null) {
        return zi;
    }

    int index = GMT_ID_LENGTH;
    boolean negative = false;
    char c = id.charAt(index++);
    if (c == '-') {
        negative = true;
    } else if (c != '+') {
        return null;
    }

    int hours = 0;
    int num = 0;
    int countDelim = 0;
    int len = 0;
    while (index < length) {
        c = id.charAt(index++);
        if (c == ':') {
            if (countDelim > 0) {
                return null;
            }
            if (len > 2) {
                return null;
            }
            hours = num;
            countDelim++;
            num = 0;
            len = 0;
            continue;
        }
        if (c < '0' || c > '9') {
            return null;
        }
        num = num * 10 + (c - '0');
        len++;
    }
    if (index != length) {
        return null;
    }
    if (countDelim == 0) {
        if (len <= 2) {
            hours = num;
            num = 0;
        } else {
            hours = num / 100;
            num %= 100;
        }
    } else {
        if (len != 2) {
            return null;
        }
    }
    if (hours > 23 || num > 59) {
        return null;
    }
    int gmtOffset =  (hours * 60 + num) * 60 * 1000;

    if (gmtOffset == 0) {
        zi = ZoneInfoFile.getZoneInfo(GMT_ID);
        if (negative) {
            zi.setID("GMT-00:00");
        } else {
            zi.setID("GMT+00:00");
        }
    } else {
        zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset);
    }
    return zi;
}
 

/**
 * Returns a name in the specified {@code style} of this {@code TimeZone}
 * suitable for presentation to the user in the specified {@code
 * locale}. If the specified {@code daylight} is {@code true}, a Daylight
 * Saving Time name is returned (even if this {@code TimeZone} doesn't
 * observe Daylight Saving Time). Otherwise, a Standard Time name is
 * returned.
 *
 * <p>When looking up a time zone name, the {@linkplain
 * ResourceBundle.Control#getCandidateLocales(String,Locale) default
 * <code>Locale</code> search path of <code>ResourceBundle</code>} derived
 * from the specified {@code locale} is used. (No {@linkplain
 * ResourceBundle.Control#getFallbackLocale(String,Locale) fallback
 * <code>Locale</code>} search is performed.) If a time zone name in any
 * {@code Locale} of the search path, including {@link Locale#ROOT}, is
 * found, the name is returned. Otherwise, a string in the
 * <a href="#NormalizedCustomID">normalized custom ID format</a> is returned.
 *
 * @param daylight {@code true} specifying a Daylight Saving Time name, or
 *                 {@code false} specifying a Standard Time name
 * @param style either {@link #LONG} or {@link #SHORT}
 * @param locale   the locale in which to supply the display name.
 * @return the human-readable name of this time zone in the given locale.
 * @exception IllegalArgumentException if {@code style} is invalid.
 * @exception NullPointerException if {@code locale} is {@code null}.
 * @since 1.2
 * @see java.text.DateFormatSymbols#getZoneStrings()
 */
public String getDisplayName(boolean daylight, int style, Locale locale) {
    if (style != SHORT && style != LONG) {
        throw new IllegalArgumentException("Illegal style: " + style);
    }
    String id = getID();
    String name = TimeZoneNameUtility.retrieveDisplayName(id, daylight, style, locale);
    if (name != null) {
        return name;
    }

    if (id.startsWith("GMT") && id.length() > 3) {
        char sign = id.charAt(3);
        if (sign == '+' || sign == '-') {
            return id;
        }
    }
    int offset = getRawOffset();
    if (daylight) {
        offset += getDSTSavings();
    }
    return ZoneInfoFile.toCustomID(offset);
}