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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.wicket.util.time;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;
/**
* An immutable Time class that represents a specific point in time. The underlying
* representation is a long value which holds a number of milliseconds since January 1,
* 1970, 0:00 GMT. To represent a duration of time, such as "6 seconds", use the
* Duration class. To represent a time period with a start and end time, use the
* TimeFrame class. To represent a time of day, use the TimeOfDay class.
*
* @author Jonathan Locke
* @since 1.2.6
*/
public final class Time extends AbstractTime
{
private static final long serialVersionUID = 1L;
/** the beginning of UNIX time: January 1, 1970, 0:00 GMT. */
public static final Time START_OF_UNIX_TIME = millis(0);
/** parser in 'yyyy.MM.dd' format. */
private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy.MM.dd",
Locale.ENGLISH);
/** parser in 'yyyy.MM.dd-h.mma' format. */
private static final SimpleDateFormat dateTimeFormat = new SimpleDateFormat("yyyy.MM.dd-h.mma",
Locale.ENGLISH);
/** required for rfc1123 date format */
private static final String[] DAYS =
{"Sat", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
/** required for rfc1123 date format */
private static final String[] MONTHS =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "Jan"};
/** time zone for greenwich mean time */
public static final TimeZone GMT = TimeZone.getTimeZone("GMT");
/**
* Retrieves a Time instance based on the current time.
*
* @return the current Time
*/
public static Time now()
{
return millis(System.currentTimeMillis());
}
/**
* Retrieves a Time instance based on the given milliseconds.
*
* @param time
* the Time value in milliseconds since START_OF_UNIX_TIME
* @return a corresponding immutable Time object
*/
public static Time millis(final long time)
{
return new Time(time);
}
/**
* Retrieves a Time instance by parsing 'yyyy.MM.dd' format.
*
* @param calendar
* the Calendar to use when parsing date String
* @param string
* the String to parse
* @return the time
* @throws ParseException
*/
public static Time parseDate(final Calendar calendar, final String string)
throws ParseException
{
synchronized (dateFormat)
{
synchronized (calendar)
{
dateFormat.setCalendar(calendar);
return valueOf(dateFormat.parse(string));
}
}
}
/**
* Retrieves a Time instance by parsing 'yyyy.MM.dd' format using a local time
* Calendar.
*
* @param string
* the String to parse
* @return the time
* @throws ParseException
*/
public static Time parseDate(final String string) throws ParseException
{
return parseDate(localtime, string);
}
/**
* Retrieves a Time instance by parsing 'yyyy.MM.dd-h.mma' format.
*
* @param calendar
* the Calendar to use when parsing the String
* @param string
* the String to parse
* @return an immutable UNIX Time value
* @throws ParseException
*/
public static Time valueOf(final Calendar calendar, final String string) throws ParseException
{
synchronized (dateTimeFormat)
{
synchronized (calendar)
{
dateTimeFormat.setCalendar(calendar);
return valueOf(dateTimeFormat.parse(string));
}
}
}
/**
* Retrieves a Time instance based on the given Calendar and
* {@link TimeOfDay} objects.
*
* @param calendar
* the Calendar to use
* @param timeOfDay
* the time of day
* @return a Time value for the time of day today
*/
public static Time valueOf(final Calendar calendar, final TimeOfDay timeOfDay)
{
synchronized (calendar)
{
// Set time to midnight today
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 0); // WICKET-2349
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0); // WICKET-1670
// Add time of day milliseconds to midnight
return millis(calendar.getTimeInMillis() + timeOfDay.getMilliseconds());
}
}
/**
* Retrieves a Time instance based on the given Date object.
*
* @param date
* a java.util.Date object
* @return a corresponding immutable Time object
*/
public static Time valueOf(final Date date)
{
return new Time(date.getTime());
}
/**
* Retrieves a Time instance by parsing 'yyyy.MM.dd-h.mma' format.
*
* @param string
* the String to parse
* @return the Time instance
* @throws ParseException
*/
public static Time valueOf(final String string) throws ParseException
{
return valueOf(localtime, string);
}
/**
* Retrieves a Time instance by parsing 'pattern' format.
*
* @param string
* input
* @param pattern
* the pattern to parse
* @return a Time instance that resulted from parsing the given String
* @throws ParseException
*/
public static Time valueOf(final String string, final String pattern) throws ParseException
{
final SimpleDateFormat dateTimeFormat = new SimpleDateFormat(pattern, Locale.ENGLISH);
dateTimeFormat.setCalendar(localtime);
return valueOf(dateTimeFormat.parse(string));
}
/**
* Retrieves a Time instance based on the given {@link TimeOfDay} object.
*
* @param timeOfDay
* the time of day in local time
* @return a Time value for the time of day today
*/
public static Time valueOf(final TimeOfDay timeOfDay)
{
return valueOf(localtime, timeOfDay);
}
/**
* Private constructor forces use of static factory methods.
*
* @param time
* the Time value in milliseconds since START_OF_UNIX_TIME
*/
private Time(final long time)
{
super(time);
}
/**
* Adds the given Duration to this Time object, moving the time into
* the future.
*
* @param duration
* the Duration to add
* @return this Time + Duration
*/
public Time add(final Duration duration)
{
return millis(getMilliseconds() + duration.getMilliseconds());
}
/**
* Calculates the amount of time that has elapsed since this Time value.
*
* @return the amount of time that has elapsed since this Time value
* @throws IllegalStateException
* thrown if this Time value is in the future
*/
public Duration elapsedSince()
{
final Time now = now();
if (this.greaterThan(now))
{
throw new IllegalStateException("This time is in the future");
}
return now.subtract(this);
}
/**
* Retrieves the Duration from now to this Time value. If this
* Time value is in the past, then the Duration returned will be
* negative. Otherwise, it will be the number of milliseconds from now to this Time
* .
*
* @return the Duration from now to this Time value
*/
public Duration fromNow()
{
return subtract(now());
}
/**
* Retrieves the value of a field from the given Calendar.
*
* @param calendar
* the Calendar to use
* @param field
* the Calendar field to get
* @return the field's value for this point in time on the given Calendar
*/
public int get(final Calendar calendar, final int field)
{
synchronized (calendar)
{
calendar.setTimeInMillis(getMilliseconds());
return calendar.get(field);
}
}
/**
* Retrieves the value of a field.
*
* @param field
* the Calendar field to get
* @return the field's value (in local time)
*/
public int get(final int field)
{
return get(localtime, field);
}
/**
* Retrieves the day of month field of the current Calendar.
*
* @return the day of month field value
*/
public int getDayOfMonth()
{
return getDayOfMonth(localtime);
}
/**
* Retrieves the day of month field of the given Calendar.
*
* @param calendar
* the Calendar to get the field value from
* @return the day of month field value
*/
public int getDayOfMonth(final Calendar calendar)
{
return get(calendar, Calendar.DAY_OF_MONTH);
}
/**
* Retrieves the hour field of the current Calendar.
*
* @return the hour field value
*/
public int getHour()
{
return getHour(localtime);
}
/**
* Retrieves the hour field of the given Calendar.
*
* @param calendar
* the Calendar to get the field value from
* @return the hour field value
*/
public int getHour(final Calendar calendar)
{
return get(calendar, Calendar.HOUR_OF_DAY);
}
/**
* Retrieves the minute field of the current Calendar.
*
* @return the minute field value
*/
public int getMinute()
{
return getMinute(localtime);
}
/**
* Retrieves the minute field of the given Calendar.
*
* @param calendar
* the Calendar from which to get the field value
* @return the minute field value
*/
public int getMinute(final Calendar calendar)
{
return get(calendar, Calendar.MINUTE);
}
/**
* Retrieves the month field of the current Calendar.
*
* @return the month field value
*/
public int getMonth()
{
return getMonth(localtime);
}
/**
* Retrieves the month field of the given Calendar.
*
* @param calendar
* the Calendar from which to get the field value
* @return the month field value
*/
public int getMonth(final Calendar calendar)
{
return get(calendar, Calendar.MONTH);
}
/**
* Retrieves the seconds field of the current Calendar.
*
* @return the seconds field value
*/
public int getSecond()
{
return getSecond(localtime);
}
/**
* Retrieves the seconds field of the given Calendar.
*
* @param calendar
* the Calendar from which to get the field value
* @return the seconds field value
*/
public int getSecond(final Calendar calendar)
{
return get(calendar, Calendar.SECOND);
}
/**
* Retrieves the year field of the current Calendar.
*
* @return the year field value
*/
public int getYear()
{
return getYear(localtime);
}
/**
* Retrieves the year field of the given Calendar.
*
* @param calendar
* the Calendar from which to get the field value
* @return the year field value
*/
public int getYear(final Calendar calendar)
{
return get(calendar, Calendar.YEAR);
}
/**
* Subtracts the given Duration from this Time object, moving the time
* into the past.
*
* @param duration
* the Duration to subtract
* @return this duration of time
*/
public Time subtract(final Duration duration)
{
return millis(getMilliseconds() - duration.getMilliseconds());
}
/**
* Subtract time from this and returns the difference as a Duration object.
*
* @param that
* the time to subtract
* @return the Duration between this and that time
*/
public Duration subtract(final Time that)
{
return Duration.milliseconds(getMilliseconds() - that.getMilliseconds());
}
/**
* Retrieves a Date object for this Time object. A new
* Date object is always returned rather than attempting to cache a date since
* Date is mutable.
*
* @return this immutable Time object as a mutable java.util.Date
* object
*/
public Date toDate()
{
return new Date(getMilliseconds());
}
/**
* Converts this Time value to a date String using the date formatter
* 'yyyy.MM.dd'.
*
* @return the date string
*/
public String toDateString()
{
return toDateString(localtime);
}
/**
* Converts this Time value to a date String using the formatter
* 'yyyy.MM.dd'.
*
* @param calendar
* the Calendar to use in the conversion
* @return the date String
*/
public String toDateString(final Calendar calendar)
{
synchronized (dateFormat)
{
synchronized (calendar)
{
dateFormat.setCalendar(calendar);
return dateFormat.format(new Date(getMilliseconds())).toLowerCase();
}
}
}
/**
* Converts this Time value to a String suitable for use in a file
* system name.
*
* @return this Time value as a formatted String
*/
@Override
public String toString()
{
return toDateString() + "-" + toTimeString();
}
/**
* Converts this Time object to a String using the given
* Calendar and format.
*
* @param calendar
* the Calendar to use in the conversion
* @param format
* the format to use
* @return this Time value as a formatted String
*/
public String toString(final Calendar calendar, final String format)
{
final SimpleDateFormat dateTimeFormat = new SimpleDateFormat(format, Locale.ENGLISH);
dateTimeFormat.setCalendar(calendar == null ? localtime : calendar);
return dateTimeFormat.format(new Date(getMilliseconds()));
}
/**
* Converts this Time value to a String using the given format.
*
* @param format
* the format to use
* @return this Time value as a formatted string
*/
public String toString(final String format)
{
return toString(null, format);
}
/**
* Returns this time stamp in RFC1123 string format. Contrary to
* {@link java.text.SimpleDateFormat} this is thread-safe. Taken from the source code of jetty
* 7.3.0, credits + thanks to Greg Wilkins!
*
* @return timestamp string in RFC1123 format
*/
public String toRfc1123TimestampString()
{
final Calendar cal = GregorianCalendar.getInstance(GMT);
final StringBuilder buf = new StringBuilder(32);
cal.setTimeInMillis(getMilliseconds());
int day_of_week = cal.get(Calendar.DAY_OF_WEEK);
int day_of_month = cal.get(Calendar.DAY_OF_MONTH);
int month = cal.get(Calendar.MONTH);
int year = cal.get(Calendar.YEAR);
int century = year / 100;
year = year % 100;
int hours = cal.get(Calendar.HOUR_OF_DAY);
int minutes = cal.get(Calendar.MINUTE);
int seconds = cal.get(Calendar.SECOND);
buf.append(DAYS[day_of_week]);
buf.append(',');
buf.append(' ');
appendTwoDigits(buf, day_of_month);
buf.append(' ');
buf.append(MONTHS[month]);
buf.append(' ');
appendTwoDigits(buf, century);
appendTwoDigits(buf, year);
buf.append(' ');
appendTwoDigits(buf, hours);
buf.append(':');
appendTwoDigits(buf, minutes);
buf.append(':');
appendTwoDigits(buf, seconds);
buf.append(" GMT");
return buf.toString();
}
/**
* helper method for {@link #toRfc1123TimestampString()}
*
* @param str
* @param number
*/
private static void appendTwoDigits(StringBuilder str, int number)
{
str.append((char)(number / 10 + '0'));
str.append((char)(number % 10 + '0'));
}
}
