minute.java

用于制作报表的中间件控件,纯java编写,还附带有数据库操作的源代码

     * @since 1.0.3
     */
    public void peg(Calendar calendar) {
        this.firstMillisecond = getFirstMillisecond(calendar);
        this.lastMillisecond = getLastMillisecond(calendar);
    }

    /**
     * Returns the minute preceding this one.
     *
     * @return The minute preceding this one.
     */
    public RegularTimePeriod previous() {
        Minute result;
        if (this.minute != FIRST_MINUTE_IN_HOUR) {
            result = new Minute(this.minute - 1, getHour());
        }
        else {
            Hour h = (Hour) getHour().previous();
            if (h != null) {
                result = new Minute(LAST_MINUTE_IN_HOUR, h);
            }
            else {
                result = null;
            }
        }
        return result;
    }

    /**
     * Returns the minute following this one.
     *
     * @return The minute following this one.
     */
    public RegularTimePeriod next() {

        Minute result;
        if (this.minute != LAST_MINUTE_IN_HOUR) {
            result = new Minute(this.minute + 1, getHour());
        }
        else { // we are at the last minute in the hour...
            Hour nextHour = (Hour) getHour().next();
            if (nextHour != null) {
                result = new Minute(FIRST_MINUTE_IN_HOUR, nextHour);
            }
            else {
                result = null;
            }
        }
        return result;

    }

    /**
     * Returns a serial index number for the minute.
     *
     * @return The serial index number.
     */
    public long getSerialIndex() {
        long hourIndex = this.day.getSerialIndex() * 24L + this.hour;
        return hourIndex * 60L + this.minute;
    }

    /**
     * Returns the first millisecond of the minute.
     *
     * @param calendar  the calendar which defines the timezone 
     *     (<code>null</code> not permitted).
     *
     * @return The first millisecond.
     *
     * @throws NullPointerException if <code>calendar</code> is 
     *     <code>null</code>.
     */
    public long getFirstMillisecond(Calendar calendar) {

        int year = this.day.getYear();
        int month = this.day.getMonth() - 1;
        int day = this.day.getDayOfMonth();

        calendar.clear();
        calendar.set(year, month, day, this.hour, this.minute, 0);
        calendar.set(Calendar.MILLISECOND, 0);

        //return calendar.getTimeInMillis();  // this won't work for JDK 1.3
        return calendar.getTime().getTime();

    }

    /**
     * Returns the last millisecond of the minute.
     *
     * @param calendar  the calendar / timezone (<code>null</code> not 
     *     permitted).
     *
     * @return The last millisecond.
     *
     * @throws NullPointerException if <code>calendar</code> is 
     *     <code>null</code>.
     */
    public long getLastMillisecond(Calendar calendar) {

        int year = this.day.getYear();
        int month = this.day.getMonth() - 1;
        int day = this.day.getDayOfMonth();

        calendar.clear();
        calendar.set(year, month, day, this.hour, this.minute, 59);
        calendar.set(Calendar.MILLISECOND, 999);

        //return calendar.getTimeInMillis();  // this won't work for JDK 1.3
        return calendar.getTime().getTime();

    }

    /**
     * Tests the equality of this object against an arbitrary Object.
     * <P>
     * This method will return true ONLY if the object is a Minute object
     * representing the same minute as this instance.
     *
     * @param obj  the object to compare (<code>null</code> permitted).
     *
     * @return <code>true</code> if the minute and hour value of this and the
     *      object are the same.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof Minute)) {
            return false;
        }
        Minute that = (Minute) obj;
        if (this.minute != that.minute) {
            return false;
        }
        if (this.hour != that.hour) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code for this object instance.  The approach described 
     * by Joshua Bloch in "Effective Java" has been used here:
     * <p>
     * <code>http://developer.java.sun.com/developer/Books/effectivejava
     * /Chapter3.pdf</code>
     * 
     * @return A hash code.
     */
    public int hashCode() {
        int result = 17;
        result = 37 * result + this.minute;
        result = 37 * result + this.hour;
        result = 37 * result + this.day.hashCode();
        return result;
    }

    /**
     * Returns an integer indicating the order of this Minute object relative
     * to the specified object:
     *
     * negative == before, zero == same, positive == after.
     *
     * @param o1  object to compare.
     *
     * @return negative == before, zero == same, positive == after.
     */
    public int compareTo(Object o1) {

        int result;

        // CASE 1 : Comparing to another Minute object
        // -------------------------------------------
        if (o1 instanceof Minute) {
            Minute m = (Minute) o1;
            result = getHour().compareTo(m.getHour());
            if (result == 0) {
                result = this.minute - m.getMinute();
            }
        }

        // CASE 2 : Comparing to another TimePeriod object
        // -----------------------------------------------
        else if (o1 instanceof RegularTimePeriod) {
            // more difficult case - evaluate later...
            result = 0;
        }

        // CASE 3 : Comparing to a non-TimePeriod object
        // ---------------------------------------------
        else {
            // consider time periods to be ordered after general objects
            result = 1;
        }

        return result;

    }

    /**
     * Creates a Minute instance by parsing a string.  The string is assumed to
     * be in the format "YYYY-MM-DD HH:MM", perhaps with leading or trailing
     * whitespace.
     *
     * @param s  the minute string to parse.
     *
     * @return <code>null</code>, if the string is not parseable, the minute
     *      otherwise.
     */
    public static Minute parseMinute(String s) {

        Minute result = null;
        s = s.trim();

        String daystr = s.substring(0, Math.min(10, s.length()));
        Day day = Day.parseDay(daystr);
        if (day != null) {
            String hmstr = s.substring(
                Math.min(daystr.length() + 1, s.length()), s.length()
            );
            hmstr = hmstr.trim();

            String hourstr = hmstr.substring(0, Math.min(2, hmstr.length()));
            int hour = Integer.parseInt(hourstr);

            if ((hour >= 0) && (hour <= 23)) {
                String minstr = hmstr.substring(
                    Math.min(hourstr.length() + 1, hmstr.length()), 
                    hmstr.length()
                );
                int minute = Integer.parseInt(minstr);
                if ((minute >= 0) && (minute <= 59)) {
                    result = new Minute(minute, new Hour(hour, day));
                }
            }
        }

        return result;

    }

}