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This project holds utility classes to create or generate random data
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/**
* The MIT License
*
* Copyright (C) 2015 Asterios Raptis
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package de.alpharogroup.random.date;
import java.security.SecureRandom;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.util.Date;
import java.util.List;
import java.util.Objects;
import de.alpharogroup.collections.list.ListFactory;
import de.alpharogroup.date.CalculateDateExtensions;
import de.alpharogroup.date.CreateDateExtensions;
import de.alpharogroup.random.DefaultSecureRandom;
import de.alpharogroup.random.SecureRandomFactory;
import de.alpharogroup.random.enums.RandomAlgorithm;
import de.alpharogroup.random.number.RandomBooleanFactory;
import de.alpharogroup.random.number.RandomIntFactory;
import de.alpharogroup.random.number.RandomLongFactory;
/**
* The factory class {@link RandomDateFactory} for creating random Date objects
*/
public final class RandomDateFactory
{
/**
* Creates a random birthday-date between 9 and 55 years.
*
* @return 's the random date.
*/
public static Date randomBirthday()
{
final Date now = CreateDateExtensions.now();
// About 55 years.
final Date past = randomDateBefore(now, 20000);
// About 9 years.
final Date recentlyPast = randomDateBefore(now, 3000);
return randomBirthday(recentlyPast, past);
}
/**
* Creates a random birthday-date between the two given date-objects.
*
* @param from
* The date from where to start.
* @param till
* The date from where to end.
* @return 's the random date.
*/
public static Date randomBirthday(final Date from, final Date till)
{
return randomDatebetween(from, till);
}
/**
* Creates a random Date that is after from the given Date.
*
* @param date
* The Date from where to compute the future date.
*
* @return The random Date in the future.
*/
public static Date randomDateAfter(final Date date)
{
return randomDateAfter(date, RandomIntFactory.randomInt(10000));
}
/**
* Creates a random Date that is after from the given Date.
*
* @param date
* The Date from where to compute the future date.
* @param range
* The range.
*
* @return The random Date in the future.
*/
public static Date randomDateAfter(final Date date, final int range)
{
return randomDateAfter(date, range, DefaultSecureRandom.get());
}
/**
* Creates a random Date that is after from the given Date.
*
* @param date
* The Date from where to compute the future date.
* @param range
* The range.
* @param secureRandom
* the secure random for Date generation
*
* @return The random Date in the future.
*/
public static Date randomDateAfter(final Date date, final int range, SecureRandom secureRandom)
{
return CalculateDateExtensions.addDays(date,
RandomIntFactory.randomInt(range, RandomAlgorithm.SECURE_RANDOM, secureRandom));
}
/**
* Creates a random date that is before from the given date.
*
* @param date
* The date from where to compute the Past date.
*
* @return The random Date in the past.
*/
public static Date randomDateBefore(final Date date)
{
return randomDateBefore(date, 10000);
}
/**
* Creates a random date that is before from the given date.
*
* @param date
* The date from where to compute the past date.
* @param range
* The range.
*
* @return The random Date in the past.
*/
public static Date randomDateBefore(final Date date, final int range)
{
return RandomDateFactory.randomDateBefore(date, range, SecureRandomFactory.newSecureRandom());
}
/**
* Creates a random date that is before from the given date.
*
* @param date
* The date from where to compute the past date.
* @param range
* The range.
* @param secureRandom
* the secure random for Date generation
*
* @return The random Date in the past.
*/
public static Date randomDateBefore(final Date date, final int range, SecureRandom secureRandom)
{
return CalculateDateExtensions.substractDaysFromDate(date,
RandomIntFactory.randomInt(range, RandomAlgorithm.SECURE_RANDOM, secureRandom));
}
/**
* Creates a random {@link Date}
*
* @return The random {@link Date}
*/
public static Date randomDate()
{
return RandomDateFactory.randomDate(SecureRandomFactory.newSecureRandom());
}
/**
* Creates a random date.
*
* @param from
* The date from where to begin.
* @return The random date.
*/
public static Date randomDate(final Date from)
{
return RandomDateFactory.randomDate(from, SecureRandomFactory.newSecureRandom());
}
/**
* Creates a random date.
*
* @param from
* The date from where to begin.
* @param secureRandom
* the secure random for date generation
* @return The random date.
*/
public static Date randomDate(final Date from, SecureRandom secureRandom)
{
Objects.requireNonNull(secureRandom);
final double randDouble = -secureRandom.nextDouble() * from.getTime();
final double randomDouble = from.getTime() - secureRandom.nextDouble();
final double result = (randDouble / 99999) * (randomDouble / 99999);
return new Date((long)result);
}
/**
* Creates a random {@link Date}
*
* @param secureRandom
* the secure random for {@link Date} generation
*
* @return The random {@link Date}
*/
public static Date randomDate(SecureRandom secureRandom)
{
final Date now = CreateDateExtensions.now();
if (RandomBooleanFactory.randomBoolean(secureRandom))
{
return randomDateAfter(now, 10000, secureRandom);
}
return randomDateBefore(now, 10000, secureRandom);
}
/**
* Creates a random Date between the range from start and end.
*
* @param start
* The Date from where the range starts.
* @param end
* The Date from where the range ends.
* @param secureRandom
* the secure random for date generation
* @return A random Date between the range from start and end.
*/
public static Date randomDateBetween(final Date start, final Date end,
SecureRandom secureRandom)
{
Objects.requireNonNull(secureRandom);
final long randomLong = (long)(start.getTime()
+ (secureRandom.nextDouble() * (end.getTime() - start.getTime())));
return new Date(randomLong);
}
/**
* Creates a random Date between the range from startDays and endDays from the given Date and
* gives it back as a string to the given format.
*
* @param startDate
* The date from where to start as a long.
* @param endDate
* The date from where to end as a long.
* @param format
* The format for the date.
* @param secureRandom
* the secure random for String generation
* @return The random date as a String.
*/
public static String randomDateBetween(final long startDate, final long endDate,
final String format, SecureRandom secureRandom)
{
Objects.requireNonNull(secureRandom);
final SimpleDateFormat sdf = new SimpleDateFormat(format);
long randomLongBetween = RandomLongFactory.randomLongBetween(startDate, endDate,
secureRandom);
Date between = new Date(randomLongBetween);
return sdf.format(between);
}
/**
* Creates a random Date between the range from start and end.
*
* @param start
* The Date from where the range starts.
* @param end
* The Date from where the range ends.
* @return A random Date between the range from start and end.
*/
public static Date randomDatebetween(final Date start, final Date end)
{
return RandomDateFactory.randomDateBetween(start, end,
SecureRandomFactory.newSecureRandom());
}
/**
* Creates a random Date between the range from startDays and endDays from the given Date and
* gives it back as a string to the default "dd.MM.yyyy HH:mm:ss" format.
*
* @param startDate
* The date from where to start as a long.
* @param endDate
* The date from where to end as a long.
* @return The random date as a String.
*/
public static String randomDatebetween(final long startDate, final long endDate)
{
return randomDatebetween(startDate, endDate, "dd.MM.yyyy HH:mm:ss");
}
/**
* Creates a random Date between the range from startDays and endDays from the given Date and
* gives it back as a string to the given format.
*
* @param startDate
* The date from where to start as a long.
* @param endDate
* The date from where to end as a long.
* @param format
* The format for the date.
* @return The random date as a String.
*/
public static String randomDatebetween(final long startDate, final long endDate,
final String format)
{
return RandomDateFactory.randomDateBetween(startDate, endDate, format,
SecureRandomFactory.newSecureRandom());
}
/**
* Creates a random Date between the range from startDays and endDays from the given Date.
*
* @param from
* The Date from where to the random Date to start.
* @param startDays
* The int that represents the days from where the range starts.
* @param endDays
* The int that represents the days from where the range ends.
* @return A random Date between the range from startDays and endDays from the given Date.
*/
public static Date randomDateBetween(final Date from, final int startDays, final int endDays)
{
return RandomDateFactory.randomDateAfter(from, RandomIntFactory.randomIntBetween(startDays, endDays));
}
/**
* Creates a random {@link LocalDate} object
*
* @return the random {@link LocalDate} object
*/
public static LocalDate randomLocalDate()
{
LocalDate randomLocalDate;
LocalDate now = LocalDate.now();
if (RandomBooleanFactory.randomBoolean())
{
randomLocalDate = now
.plusDays(RandomLongFactory.randomLongBetween(-999999999L, 999999999L));
}
else
{
randomLocalDate = now
.minusDays(RandomLongFactory.randomLongBetween(-999999999L, 999999999L));
}
return randomLocalDate;
}
/**
* Creates a random {@link LocalDateTime} object
*
* @return the random {@link LocalDateTime} object
*/
public static LocalDateTime randomLocalDateTime()
{
return LocalDateTime.of(randomLocalDate(), randomLocalTime());
}
/**
* Creates a random {@link LocalTime} object
*
* @return the random {@link LocalTime} object
*/
public static LocalTime randomLocalTime()
{
LocalTime randomLocalTime;
LocalTime now = LocalTime.now();
if (RandomBooleanFactory.randomBoolean())
{
randomLocalTime = now.plusHours(RandomLongFactory.randomLong(23))
.plusMinutes(RandomLongFactory.randomLong(59))
.plusSeconds(RandomLongFactory.randomLong(59));
}
else
{
randomLocalTime = now.minusHours(RandomLongFactory.randomLong(23))
.minusMinutes(RandomLongFactory.randomLong(59))
.minusSeconds(RandomLongFactory.randomLong(59));
}
return randomLocalTime;
}
/**
* Creates a random {@link LocalDateTime} object
*
* @return the zone id
*/
public static ZoneId randomZoneId()
{
List availableZoneIds = ListFactory.newArrayList(ZoneId.getAvailableZoneIds());
return ZoneId.of(
availableZoneIds.get(RandomIntFactory.randomInt(availableZoneIds.size())));
}
private RandomDateFactory()
{
}
}
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