Java tutorial
/* * 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.commons.lang.time; import java.text.ParseException; import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.Iterator; import java.util.NoSuchElementException; /** * <p>A suite of utilities surrounding the use of the * {@link java.util.Calendar} and {@link java.util.Date} object.</p> * * <p>DateUtils contains a lot of common methods considering manipulations * of Dates or Calendars. Some methods require some extra explanation. * The truncate, ceiling and round methods could be considered the Math.floor(), * Math.ceil() or Math.round versions for dates * This way date-fields will be ignored in bottom-up order. * As a complement to these methods we've introduced some fragment-methods. * With these methods the Date-fields will be ignored in top-down order. * Since a date without a year is not a valid date, you have to decide in what * kind of date-field you want your result, for instance milliseconds or days. * </p> * * @since 2.0 * @version $Id$ */ public class DateUtils { /** * Number of milliseconds in a standard second. * @since 2.1 */ public static final long MILLIS_PER_SECOND = 1000; /** * Number of milliseconds in a standard minute. * @since 2.1 */ public static final long MILLIS_PER_MINUTE = 60 * MILLIS_PER_SECOND; /** * Number of milliseconds in a standard hour. * @since 2.1 */ public static final long MILLIS_PER_HOUR = 60 * MILLIS_PER_MINUTE; /** * Number of milliseconds in a standard day. * @since 2.1 */ public static final long MILLIS_PER_DAY = 24 * MILLIS_PER_HOUR; /** * This is half a month, so this represents whether a date is in the top * or bottom half of the month. */ public static final int SEMI_MONTH = 1001; private static final int[][] fields = { { Calendar.MILLISECOND }, { Calendar.SECOND }, { Calendar.MINUTE }, { Calendar.HOUR_OF_DAY, Calendar.HOUR }, { Calendar.DATE, Calendar.DAY_OF_MONTH, Calendar.AM_PM /* Calendar.DAY_OF_YEAR, Calendar.DAY_OF_WEEK, Calendar.DAY_OF_WEEK_IN_MONTH */ }, { Calendar.MONTH, DateUtils.SEMI_MONTH }, { Calendar.YEAR }, { Calendar.ERA } }; /** * A week range, starting on Sunday. */ public static final int RANGE_WEEK_SUNDAY = 1; /** * A week range, starting on Monday. */ public static final int RANGE_WEEK_MONDAY = 2; /** * A week range, starting on the day focused. */ public static final int RANGE_WEEK_RELATIVE = 3; /** * A week range, centered around the day focused. */ public static final int RANGE_WEEK_CENTER = 4; /** * A month range, the week starting on Sunday. */ public static final int RANGE_MONTH_SUNDAY = 5; /** * A month range, the week starting on Monday. */ public static final int RANGE_MONTH_MONDAY = 6; /** * Constant marker for truncating. * @since 3.0 */ private static final int MODIFY_TRUNCATE = 0; /** * Constant marker for rounding. * @since 3.0 */ private static final int MODIFY_ROUND = 1; /** * Constant marker for ceiling. * @since 3.0 */ private static final int MODIFY_CEILING = 2; /** * <p>{@code DateUtils} instances should NOT be constructed in * standard programming. Instead, the static methods on the class should * be used, such as {@code DateUtils.parseDate(str);}.</p> * * <p>This constructor is public to permit tools that require a JavaBean * instance to operate.</p> */ public DateUtils() { super(); } //----------------------------------------------------------------------- /** * <p>Checks if two date objects are on the same day ignoring time.</p> * * <p>28 Mar 2002 13:45 and 28 Mar 2002 06:01 would return true. * 28 Mar 2002 13:45 and 12 Mar 2002 13:45 would return false. * </p> * * @param date1 the first date, not altered, not null * @param date2 the second date, not altered, not null * @return true if they represent the same day * @throws IllegalArgumentException if either date is <code>null</code> * @since 2.1 */ public static boolean isSameDay(Date date1, Date date2) { if (date1 == null || date2 == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar cal1 = Calendar.getInstance(); cal1.setTime(date1); Calendar cal2 = Calendar.getInstance(); cal2.setTime(date2); return isSameDay(cal1, cal2); } /** * <p>Checks if two calendar objects are on the same day ignoring time.</p> * * <p>28 Mar 2002 13:45 and 28 Mar 2002 06:01 would return true. * 28 Mar 2002 13:45 and 12 Mar 2002 13:45 would return false. * </p> * * @param cal1 the first calendar, not altered, not null * @param cal2 the second calendar, not altered, not null * @return true if they represent the same day * @throws IllegalArgumentException if either calendar is <code>null</code> * @since 2.1 */ public static boolean isSameDay(Calendar cal1, Calendar cal2) { if (cal1 == null || cal2 == null) { throw new IllegalArgumentException("The date must not be null"); } return (cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA) && cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) && cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR)); } //----------------------------------------------------------------------- /** * <p>Checks if two date objects represent the same instant in time.</p> * * <p>This method compares the long millisecond time of the two objects.</p> * * @param date1 the first date, not altered, not null * @param date2 the second date, not altered, not null * @return true if they represent the same millisecond instant * @throws IllegalArgumentException if either date is <code>null</code> * @since 2.1 */ public static boolean isSameInstant(Date date1, Date date2) { if (date1 == null || date2 == null) { throw new IllegalArgumentException("The date must not be null"); } return date1.getTime() == date2.getTime(); } /** * <p>Checks if two calendar objects represent the same instant in time.</p> * * <p>This method compares the long millisecond time of the two objects.</p> * * @param cal1 the first calendar, not altered, not null * @param cal2 the second calendar, not altered, not null * @return true if they represent the same millisecond instant * @throws IllegalArgumentException if either date is <code>null</code> * @since 2.1 */ public static boolean isSameInstant(Calendar cal1, Calendar cal2) { if (cal1 == null || cal2 == null) { throw new IllegalArgumentException("The date must not be null"); } return cal1.getTime().getTime() == cal2.getTime().getTime(); } //----------------------------------------------------------------------- /** * <p>Checks if two calendar objects represent the same local time.</p> * * <p>This method compares the values of the fields of the two objects. * In addition, both calendars must be the same of the same type.</p> * * @param cal1 the first calendar, not altered, not null * @param cal2 the second calendar, not altered, not null * @return true if they represent the same millisecond instant * @throws IllegalArgumentException if either date is <code>null</code> * @since 2.1 */ public static boolean isSameLocalTime(Calendar cal1, Calendar cal2) { if (cal1 == null || cal2 == null) { throw new IllegalArgumentException("The date must not be null"); } return (cal1.get(Calendar.MILLISECOND) == cal2.get(Calendar.MILLISECOND) && cal1.get(Calendar.SECOND) == cal2.get(Calendar.SECOND) && cal1.get(Calendar.MINUTE) == cal2.get(Calendar.MINUTE) && cal1.get(Calendar.HOUR_OF_DAY) == cal2.get(Calendar.HOUR_OF_DAY) && cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR) && cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) && cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA) && cal1.getClass() == cal2.getClass()); } //----------------------------------------------------------------------- /** * <p>Parses a string representing a date by trying a variety of different parsers.</p> * * <p>The parse will try each parse pattern in turn. * A parse is only deemed successful if it parses the whole of the input string. * If no parse patterns match, a ParseException is thrown.</p> * The parser will be lenient toward the parsed date. * * @param str the date to parse, not null * @param parsePatterns the date format patterns to use, see SimpleDateFormat, not null * @return the parsed date * @throws IllegalArgumentException if the date string or pattern array is null * @throws ParseException if none of the date patterns were suitable (or there were none) */ public static Date parseDate(String str, String... parsePatterns) throws ParseException { return parseDateWithLeniency(str, parsePatterns, true); } //----------------------------------------------------------------------- /** * <p>Parses a string representing a date by trying a variety of different parsers.</p> * * <p>The parse will try each parse pattern in turn. * A parse is only deemed successful if it parses the whole of the input string. * If no parse patterns match, a ParseException is thrown.</p> * The parser parses strictly - it does not allow for dates such as "February 942, 1996". * * @param str the date to parse, not null * @param parsePatterns the date format patterns to use, see SimpleDateFormat, not null * @return the parsed date * @throws IllegalArgumentException if the date string or pattern array is null * @throws ParseException if none of the date patterns were suitable * @since 2.5 */ public static Date parseDateStrictly(String str, String... parsePatterns) throws ParseException { return parseDateWithLeniency(str, parsePatterns, false); } /** * <p>Parses a string representing a date by trying a variety of different parsers.</p> * * <p>The parse will try each parse pattern in turn. * A parse is only deemed successful if it parses the whole of the input string. * If no parse patterns match, a ParseException is thrown.</p> * * @param str the date to parse, not null * @param parsePatterns the date format patterns to use, see SimpleDateFormat, not null * @param lenient Specify whether or not date/time parsing is to be lenient. * @return the parsed date * @throws IllegalArgumentException if the date string or pattern array is null * @throws ParseException if none of the date patterns were suitable * @see java.util.Calender#isLenient() */ private static Date parseDateWithLeniency(String str, String[] parsePatterns, boolean lenient) throws ParseException { if (str == null || parsePatterns == null) { throw new IllegalArgumentException("Date and Patterns must not be null"); } SimpleDateFormat parser = new SimpleDateFormat(); parser.setLenient(lenient); ParsePosition pos = new ParsePosition(0); for (String parsePattern : parsePatterns) { String pattern = parsePattern; // LANG-530 - need to make sure 'ZZ' output doesn't get passed to SimpleDateFormat if (parsePattern.endsWith("ZZ")) { pattern = pattern.substring(0, pattern.length() - 1); } parser.applyPattern(pattern); pos.setIndex(0); String str2 = str; // LANG-530 - need to make sure 'ZZ' output doesn't hit SimpleDateFormat as it will ParseException if (parsePattern.endsWith("ZZ")) { str2 = str.replaceAll("([-+][0-9][0-9]):([0-9][0-9])$", "$1$2"); } Date date = parser.parse(str2, pos); if (date != null && pos.getIndex() == str2.length()) { return date; } } throw new ParseException("Unable to parse the date: " + str, -1); } //----------------------------------------------------------------------- /** * Adds a number of years to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addYears(Date date, int amount) { return add(date, Calendar.YEAR, amount); } //----------------------------------------------------------------------- /** * Adds a number of months to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addMonths(Date date, int amount) { return add(date, Calendar.MONTH, amount); } //----------------------------------------------------------------------- /** * Adds a number of weeks to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addWeeks(Date date, int amount) { return add(date, Calendar.WEEK_OF_YEAR, amount); } //----------------------------------------------------------------------- /** * Adds a number of days to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addDays(Date date, int amount) { return add(date, Calendar.DAY_OF_MONTH, amount); } //----------------------------------------------------------------------- /** * Adds a number of hours to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addHours(Date date, int amount) { return add(date, Calendar.HOUR_OF_DAY, amount); } //----------------------------------------------------------------------- /** * Adds a number of minutes to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addMinutes(Date date, int amount) { return add(date, Calendar.MINUTE, amount); } //----------------------------------------------------------------------- /** * Adds a number of seconds to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addSeconds(Date date, int amount) { return add(date, Calendar.SECOND, amount); } //----------------------------------------------------------------------- /** * Adds a number of milliseconds to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addMilliseconds(Date date, int amount) { return add(date, Calendar.MILLISECOND, amount); } //----------------------------------------------------------------------- /** * Adds to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param calendarField the calendar field to add to * @param amount the amount to add, may be negative * @return the new {@code Date} with the amount added * @throws IllegalArgumentException if the date is null */ private static Date add(Date date, int calendarField, int amount) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar c = Calendar.getInstance(); c.setTime(date); c.add(calendarField, amount); return c.getTime(); } //----------------------------------------------------------------------- /** * Sets the years field to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to set * @return a new {@code Date} set with the specified value * @throws IllegalArgumentException if the date is null * @since 2.4 */ public static Date setYears(Date date, int amount) { return set(date, Calendar.YEAR, amount); } //----------------------------------------------------------------------- /** * Sets the months field to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to set * @return a new {@code Date} set with the specified value * @throws IllegalArgumentException if the date is null * @since 2.4 */ public static Date setMonths(Date date, int amount) { return set(date, Calendar.MONTH, amount); } //----------------------------------------------------------------------- /** * Sets the day of month field to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to set * @return a new {@code Date} set with the specified value * @throws IllegalArgumentException if the date is null * @since 2.4 */ public static Date setDays(Date date, int amount) { return set(date, Calendar.DAY_OF_MONTH, amount); } //----------------------------------------------------------------------- /** * Sets the hours field to a date returning a new object. Hours range * from 0-23. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to set * @return a new {@code Date} set with the specified value * @throws IllegalArgumentException if the date is null * @since 2.4 */ public static Date setHours(Date date, int amount) { return set(date, Calendar.HOUR_OF_DAY, amount); } //----------------------------------------------------------------------- /** * Sets the minute field to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to set * @return a new {@code Date} set with the specified value * @throws IllegalArgumentException if the date is null * @since 2.4 */ public static Date setMinutes(Date date, int amount) { return set(date, Calendar.MINUTE, amount); } //----------------------------------------------------------------------- /** * Sets the seconds field to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to set * @return a new {@code Date} set with the specified value * @throws IllegalArgumentException if the date is null * @since 2.4 */ public static Date setSeconds(Date date, int amount) { return set(date, Calendar.SECOND, amount); } //----------------------------------------------------------------------- /** * Sets the miliseconds field to a date returning a new object. * The original {@code Date} is unchanged. * * @param date the date, not null * @param amount the amount to set * @return a new {@code Date} set with the specified value * @throws IllegalArgumentException if the date is null * @since 2.4 */ public static Date setMilliseconds(Date date, int amount) { return set(date, Calendar.MILLISECOND, amount); } //----------------------------------------------------------------------- /** * Sets the specified field to a date returning a new object. * This does not use a lenient calendar. * The original {@code Date} is unchanged. * * @param date the date, not null * @param calendarField the {@code Calendar} field to set the amount to * @param amount the amount to set * @return a new {@code Date} set with the specified value * @throws IllegalArgumentException if the date is null * @since 2.4 */ private static Date set(Date date, int calendarField, int amount) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } // getInstance() returns a new object, so this method is thread safe. Calendar c = Calendar.getInstance(); c.setLenient(false); c.setTime(date); c.set(calendarField, amount); return c.getTime(); } //----------------------------------------------------------------------- /** * Convert a {@code Date} into a {@code Calendar}. * * @param date the date to convert to a Calendar * @return the created Calendar * @throws NullPointerException if null is passed in * @since 3.0 */ public static Calendar toCalendar(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); return c; } //----------------------------------------------------------------------- /** * <p>Round this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if this was passed with HOUR, it would return * 28 Mar 2002 14:00:00.000. If this was passed with MONTH, it * would return 1 April 2002 0:00:00.000.</p> * * <p>For a date in a timezone that handles the change to daylight * saving time, rounding to Calendar.HOUR_OF_DAY will behave as follows. * Suppose daylight saving time begins at 02:00 on March 30. Rounding a * date that crosses this time would produce the following values: * <ul> * <li>March 30, 2003 01:10 rounds to March 30, 2003 01:00</li> * <li>March 30, 2003 01:40 rounds to March 30, 2003 03:00</li> * <li>March 30, 2003 02:10 rounds to March 30, 2003 03:00</li> * <li>March 30, 2003 02:40 rounds to March 30, 2003 04:00</li> * </ul> * </p> * * @param date the date to work with, not null * @param field the field from {@code Calendar} or {@code SEMI_MONTH} * @return the different rounded date, not null * @throws ArithmeticException if the year is over 280 million */ public static Date round(Date date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar gval = Calendar.getInstance(); gval.setTime(date); modify(gval, field, MODIFY_ROUND); return gval.getTime(); } /** * <p>Round this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if this was passed with HOUR, it would return * 28 Mar 2002 14:00:00.000. If this was passed with MONTH, it * would return 1 April 2002 0:00:00.000.</p> * * <p>For a date in a timezone that handles the change to daylight * saving time, rounding to Calendar.HOUR_OF_DAY will behave as follows. * Suppose daylight saving time begins at 02:00 on March 30. Rounding a * date that crosses this time would produce the following values: * <ul> * <li>March 30, 2003 01:10 rounds to March 30, 2003 01:00</li> * <li>March 30, 2003 01:40 rounds to March 30, 2003 03:00</li> * <li>March 30, 2003 02:10 rounds to March 30, 2003 03:00</li> * <li>March 30, 2003 02:40 rounds to March 30, 2003 04:00</li> * </ul> * </p> * * @param date the date to work with, not null * @param field the field from {@code Calendar} or <code>SEMI_MONTH</code> * @return the different rounded date, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ArithmeticException if the year is over 280 million */ public static Calendar round(Calendar date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar rounded = (Calendar) date.clone(); modify(rounded, field, MODIFY_ROUND); return rounded; } /** * <p>Round this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if this was passed with HOUR, it would return * 28 Mar 2002 14:00:00.000. If this was passed with MONTH, it * would return 1 April 2002 0:00:00.000.</p> * * <p>For a date in a timezone that handles the change to daylight * saving time, rounding to Calendar.HOUR_OF_DAY will behave as follows. * Suppose daylight saving time begins at 02:00 on March 30. Rounding a * date that crosses this time would produce the following values: * <ul> * <li>March 30, 2003 01:10 rounds to March 30, 2003 01:00</li> * <li>March 30, 2003 01:40 rounds to March 30, 2003 03:00</li> * <li>March 30, 2003 02:10 rounds to March 30, 2003 03:00</li> * <li>March 30, 2003 02:40 rounds to March 30, 2003 04:00</li> * </ul> * </p> * * @param date the date to work with, either {@code Date} or {@code Calendar}, not null * @param field the field from {@code Calendar} or <code>SEMI_MONTH</code> * @return the different rounded date, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ClassCastException if the object type is not a {@code Date} or {@code Calendar} * @throws ArithmeticException if the year is over 280 million */ public static Date round(Object date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } if (date instanceof Date) { return round((Date) date, field); } else if (date instanceof Calendar) { return round((Calendar) date, field).getTime(); } else { throw new ClassCastException("Could not round " + date); } } //----------------------------------------------------------------------- /** * <p>Truncate this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if you passed with HOUR, it would return 28 Mar * 2002 13:00:00.000. If this was passed with MONTH, it would * return 1 Mar 2002 0:00:00.000.</p> * * @param date the date to work with, not null * @param field the field from {@code Calendar} or <code>SEMI_MONTH</code> * @return the different truncated date, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ArithmeticException if the year is over 280 million */ public static Date truncate(Date date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar gval = Calendar.getInstance(); gval.setTime(date); modify(gval, field, MODIFY_TRUNCATE); return gval.getTime(); } /** * <p>Truncate this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if you passed with HOUR, it would return 28 Mar * 2002 13:00:00.000. If this was passed with MONTH, it would * return 1 Mar 2002 0:00:00.000.</p> * * @param date the date to work with, not null * @param field the field from {@code Calendar} or <code>SEMI_MONTH</code> * @return the different truncated date, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ArithmeticException if the year is over 280 million */ public static Calendar truncate(Calendar date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar truncated = (Calendar) date.clone(); modify(truncated, field, MODIFY_TRUNCATE); return truncated; } /** * <p>Truncate this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if you passed with HOUR, it would return 28 Mar * 2002 13:00:00.000. If this was passed with MONTH, it would * return 1 Mar 2002 0:00:00.000.</p> * * @param date the date to work with, either {@code Date} or {@code Calendar}, not null * @param field the field from {@code Calendar} or <code>SEMI_MONTH</code> * @return the different truncated date, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ClassCastException if the object type is not a {@code Date} or {@code Calendar} * @throws ArithmeticException if the year is over 280 million */ public static Date truncate(Object date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } if (date instanceof Date) { return truncate((Date) date, field); } else if (date instanceof Calendar) { return truncate((Calendar) date, field).getTime(); } else { throw new ClassCastException("Could not truncate " + date); } } //----------------------------------------------------------------------- /** * <p>Ceil this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if you passed with HOUR, it would return 28 Mar * 2002 14:00:00.000. If this was passed with MONTH, it would * return 1 Apr 2002 0:00:00.000.</p> * * @param date the date to work with, not null * @param field the field from {@code Calendar} or <code>SEMI_MONTH</code> * @return the different ceil date, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ArithmeticException if the year is over 280 million * @since 2.5 */ public static Date ceiling(Date date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar gval = Calendar.getInstance(); gval.setTime(date); modify(gval, field, MODIFY_CEILING); return gval.getTime(); } /** * <p>Ceil this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if you passed with HOUR, it would return 28 Mar * 2002 13:00:00.000. If this was passed with MONTH, it would * return 1 Mar 2002 0:00:00.000.</p> * * @param date the date to work with, not null * @param field the field from {@code Calendar} or <code>SEMI_MONTH</code> * @return the different ceil date, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ArithmeticException if the year is over 280 million * @since 2.5 */ public static Calendar ceiling(Calendar date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar ceiled = (Calendar) date.clone(); modify(ceiled, field, MODIFY_CEILING); return ceiled; } /** * <p>Ceil this date, leaving the field specified as the most * significant field.</p> * * <p>For example, if you had the datetime of 28 Mar 2002 * 13:45:01.231, if you passed with HOUR, it would return 28 Mar * 2002 13:00:00.000. If this was passed with MONTH, it would * return 1 Mar 2002 0:00:00.000.</p> * * @param date the date to work with, either {@code Date} or {@code Calendar}, not null * @param field the field from {@code Calendar} or <code>SEMI_MONTH</code> * @return the different ceil date, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ClassCastException if the object type is not a {@code Date} or {@code Calendar} * @throws ArithmeticException if the year is over 280 million * @since 2.5 */ public static Date ceiling(Object date, int field) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } if (date instanceof Date) { return ceiling((Date) date, field); } else if (date instanceof Calendar) { return ceiling((Calendar) date, field).getTime(); } else { throw new ClassCastException("Could not find ceiling of for type: " + date.getClass()); } } //----------------------------------------------------------------------- /** * <p>Internal calculation method.</p> * * @param val the calendar, not null * @param field the field constant * @param modType type to truncate, round or ceiling * @throws ArithmeticException if the year is over 280 million */ private static void modify(Calendar val, int field, int modType) { if (val.get(Calendar.YEAR) > 280000000) { throw new ArithmeticException("Calendar value too large for accurate calculations"); } if (field == Calendar.MILLISECOND) { return; } // ----------------- Fix for LANG-59 ---------------------- START --------------- // see http://issues.apache.org/jira/browse/LANG-59 // // Manually truncate milliseconds, seconds and minutes, rather than using // Calendar methods. Date date = val.getTime(); long time = date.getTime(); boolean done = false; // truncate milliseconds int millisecs = val.get(Calendar.MILLISECOND); if (MODIFY_TRUNCATE == modType || millisecs < 500) { time = time - millisecs; } if (field == Calendar.SECOND) { done = true; } // truncate seconds int seconds = val.get(Calendar.SECOND); if (!done && (MODIFY_TRUNCATE == modType || seconds < 30)) { time = time - (seconds * 1000L); } if (field == Calendar.MINUTE) { done = true; } // truncate minutes int minutes = val.get(Calendar.MINUTE); if (!done && (MODIFY_TRUNCATE == modType || minutes < 30)) { time = time - (minutes * 60000L); } // reset time if (date.getTime() != time) { date.setTime(time); val.setTime(date); } // ----------------- Fix for LANG-59 ----------------------- END ---------------- boolean roundUp = false; for (int[] aField : fields) { for (int element : aField) { if (element == field) { //This is our field... we stop looping if (modType == MODIFY_CEILING || (modType == MODIFY_ROUND && roundUp)) { if (field == DateUtils.SEMI_MONTH) { //This is a special case that's hard to generalize //If the date is 1, we round up to 16, otherwise // we subtract 15 days and add 1 month if (val.get(Calendar.DATE) == 1) { val.add(Calendar.DATE, 15); } else { val.add(Calendar.DATE, -15); val.add(Calendar.MONTH, 1); } // ----------------- Fix for LANG-440 ---------------------- START --------------- } else if (field == Calendar.AM_PM) { // This is a special case // If the time is 0, we round up to 12, otherwise // we subtract 12 hours and add 1 day if (val.get(Calendar.HOUR_OF_DAY) == 0) { val.add(Calendar.HOUR_OF_DAY, 12); } else { val.add(Calendar.HOUR_OF_DAY, -12); val.add(Calendar.DATE, 1); } // ----------------- Fix for LANG-440 ---------------------- END --------------- } else { //We need at add one to this field since the // last number causes us to round up val.add(aField[0], 1); } } return; } } //We have various fields that are not easy roundings int offset = 0; boolean offsetSet = false; //These are special types of fields that require different rounding rules switch (field) { case DateUtils.SEMI_MONTH: if (aField[0] == Calendar.DATE) { //If we're going to drop the DATE field's value, // we want to do this our own way. //We need to subtrace 1 since the date has a minimum of 1 offset = val.get(Calendar.DATE) - 1; //If we're above 15 days adjustment, that means we're in the // bottom half of the month and should stay accordingly. if (offset >= 15) { offset -= 15; } //Record whether we're in the top or bottom half of that range roundUp = offset > 7; offsetSet = true; } break; case Calendar.AM_PM: if (aField[0] == Calendar.HOUR_OF_DAY) { //If we're going to drop the HOUR field's value, // we want to do this our own way. offset = val.get(Calendar.HOUR_OF_DAY); if (offset >= 12) { offset -= 12; } roundUp = offset >= 6; offsetSet = true; } break; } if (!offsetSet) { int min = val.getActualMinimum(aField[0]); int max = val.getActualMaximum(aField[0]); //Calculate the offset from the minimum allowed value offset = val.get(aField[0]) - min; //Set roundUp if this is more than half way between the minimum and maximum roundUp = offset > ((max - min) / 2); } //We need to remove this field if (offset != 0) { val.set(aField[0], val.get(aField[0]) - offset); } } throw new IllegalArgumentException("The field " + field + " is not supported"); } //----------------------------------------------------------------------- /** * <p>This constructs an <code>Iterator</code> over each day in a date * range defined by a focus date and range style.</p> * * <p>For instance, passing Thursday, July 4, 2002 and a * <code>RANGE_MONTH_SUNDAY</code> will return an <code>Iterator</code> * that starts with Sunday, June 30, 2002 and ends with Saturday, August 3, * 2002, returning a Calendar instance for each intermediate day.</p> * * <p>This method provides an iterator that returns Calendar objects. * The days are progressed using {@link Calendar#add(int, int)}.</p> * * @param focus the date to work with, not null * @param rangeStyle the style constant to use. Must be one of * {@link DateUtils#RANGE_MONTH_SUNDAY}, * {@link DateUtils#RANGE_MONTH_MONDAY}, * {@link DateUtils#RANGE_WEEK_SUNDAY}, * {@link DateUtils#RANGE_WEEK_MONDAY}, * {@link DateUtils#RANGE_WEEK_RELATIVE}, * {@link DateUtils#RANGE_WEEK_CENTER} * @return the date iterator, not null, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws IllegalArgumentException if the rangeStyle is invalid */ public static Iterator<Calendar> iterator(Date focus, int rangeStyle) { if (focus == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar gval = Calendar.getInstance(); gval.setTime(focus); return iterator(gval, rangeStyle); } /** * <p>This constructs an <code>Iterator</code> over each day in a date * range defined by a focus date and range style.</p> * * <p>For instance, passing Thursday, July 4, 2002 and a * <code>RANGE_MONTH_SUNDAY</code> will return an <code>Iterator</code> * that starts with Sunday, June 30, 2002 and ends with Saturday, August 3, * 2002, returning a Calendar instance for each intermediate day.</p> * * <p>This method provides an iterator that returns Calendar objects. * The days are progressed using {@link Calendar#add(int, int)}.</p> * * @param focus the date to work with, not null * @param rangeStyle the style constant to use. Must be one of * {@link DateUtils#RANGE_MONTH_SUNDAY}, * {@link DateUtils#RANGE_MONTH_MONDAY}, * {@link DateUtils#RANGE_WEEK_SUNDAY}, * {@link DateUtils#RANGE_WEEK_MONDAY}, * {@link DateUtils#RANGE_WEEK_RELATIVE}, * {@link DateUtils#RANGE_WEEK_CENTER} * @return the date iterator, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws IllegalArgumentException if the rangeStyle is invalid */ public static Iterator<Calendar> iterator(Calendar focus, int rangeStyle) { if (focus == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar start = null; Calendar end = null; int startCutoff = Calendar.SUNDAY; int endCutoff = Calendar.SATURDAY; switch (rangeStyle) { case RANGE_MONTH_SUNDAY: case RANGE_MONTH_MONDAY: //Set start to the first of the month start = truncate(focus, Calendar.MONTH); //Set end to the last of the month end = (Calendar) start.clone(); end.add(Calendar.MONTH, 1); end.add(Calendar.DATE, -1); //Loop start back to the previous sunday or monday if (rangeStyle == RANGE_MONTH_MONDAY) { startCutoff = Calendar.MONDAY; endCutoff = Calendar.SUNDAY; } break; case RANGE_WEEK_SUNDAY: case RANGE_WEEK_MONDAY: case RANGE_WEEK_RELATIVE: case RANGE_WEEK_CENTER: //Set start and end to the current date start = truncate(focus, Calendar.DATE); end = truncate(focus, Calendar.DATE); switch (rangeStyle) { case RANGE_WEEK_SUNDAY: //already set by default break; case RANGE_WEEK_MONDAY: startCutoff = Calendar.MONDAY; endCutoff = Calendar.SUNDAY; break; case RANGE_WEEK_RELATIVE: startCutoff = focus.get(Calendar.DAY_OF_WEEK); endCutoff = startCutoff - 1; break; case RANGE_WEEK_CENTER: startCutoff = focus.get(Calendar.DAY_OF_WEEK) - 3; endCutoff = focus.get(Calendar.DAY_OF_WEEK) + 3; break; } break; default: throw new IllegalArgumentException("The range style " + rangeStyle + " is not valid."); } if (startCutoff < Calendar.SUNDAY) { startCutoff += 7; } if (startCutoff > Calendar.SATURDAY) { startCutoff -= 7; } if (endCutoff < Calendar.SUNDAY) { endCutoff += 7; } if (endCutoff > Calendar.SATURDAY) { endCutoff -= 7; } while (start.get(Calendar.DAY_OF_WEEK) != startCutoff) { start.add(Calendar.DATE, -1); } while (end.get(Calendar.DAY_OF_WEEK) != endCutoff) { end.add(Calendar.DATE, 1); } return new DateIterator(start, end); } /** * <p>This constructs an <code>Iterator</code> over each day in a date * range defined by a focus date and range style.</p> * * <p>For instance, passing Thursday, July 4, 2002 and a * <code>RANGE_MONTH_SUNDAY</code> will return an <code>Iterator</code> * that starts with Sunday, June 30, 2002 and ends with Saturday, August 3, * 2002, returning a Calendar instance for each intermediate day.</p> * * @param focus the date to work with, either {@code Date} or {@code Calendar}, not null * @param rangeStyle the style constant to use. Must be one of the range * styles listed for the {@link #iterator(Calendar, int)} method. * @return the date iterator, not null * @throws IllegalArgumentException if the date is <code>null</code> * @throws ClassCastException if the object type is not a {@code Date} or {@code Calendar} */ public static Iterator<?> iterator(Object focus, int rangeStyle) { if (focus == null) { throw new IllegalArgumentException("The date must not be null"); } if (focus instanceof Date) { return iterator((Date) focus, rangeStyle); } else if (focus instanceof Calendar) { return iterator((Calendar) focus, rangeStyle); } else { throw new ClassCastException("Could not iterate based on " + focus); } } /** * <p>Returns the number of milliseconds within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the milliseconds of any date will only return the number of milliseconds * of the current second (resulting in a number between 0 and 999). This * method will retrieve the number of milliseconds for any fragment. * For example, if you want to calculate the number of milliseconds past today, * your fragment is Calendar.DATE or Calendar.DAY_OF_YEAR. The result will * be all milliseconds of the past hour(s), minutes(s) and second(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a SECOND field will return 0.</p> * * <p> * <ul> * <li>January 1, 2008 7:15:10.538 with Calendar.SECOND as fragment will return 538</li> * <li>January 6, 2008 7:15:10.538 with Calendar.SECOND as fragment will return 538</li> * <li>January 6, 2008 7:15:10.538 with Calendar.MINUTE as fragment will return 10538 (10*1000 + 538)</li> * <li>January 16, 2008 7:15:10.538 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in milliseconds)</li> * </ul> * </p> * * @param date the date to work with, not null * @param fragment the {@code Calendar} field part of date to calculate * @return number of milliseconds within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInMilliseconds(Date date, int fragment) { return getFragment(date, fragment, Calendar.MILLISECOND); } /** * <p>Returns the number of seconds within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the seconds of any date will only return the number of seconds * of the current minute (resulting in a number between 0 and 59). This * method will retrieve the number of seconds for any fragment. * For example, if you want to calculate the number of seconds past today, * your fragment is Calendar.DATE or Calendar.DAY_OF_YEAR. The result will * be all seconds of the past hour(s) and minutes(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a SECOND field will return 0.</p> * * <p> * <ul> * <li>January 1, 2008 7:15:10.538 with Calendar.MINUTE as fragment will return 10 * (equivalent to deprecated date.getSeconds())</li> * <li>January 6, 2008 7:15:10.538 with Calendar.MINUTE as fragment will return 10 * (equivalent to deprecated date.getSeconds())</li> * <li>January 6, 2008 7:15:10.538 with Calendar.DAY_OF_YEAR as fragment will return 26110 * (7*3600 + 15*60 + 10)</li> * <li>January 16, 2008 7:15:10.538 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in seconds)</li> * </ul> * </p> * * @param date the date to work with, not null * @param fragment the {@code Calendar} field part of date to calculate * @return number of seconds within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInSeconds(Date date, int fragment) { return getFragment(date, fragment, Calendar.SECOND); } /** * <p>Returns the number of minutes within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the minutes of any date will only return the number of minutes * of the current hour (resulting in a number between 0 and 59). This * method will retrieve the number of minutes for any fragment. * For example, if you want to calculate the number of minutes past this month, * your fragment is Calendar.MONTH. The result will be all minutes of the * past day(s) and hour(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a MINUTE field will return 0.</p> * * <p> * <ul> * <li>January 1, 2008 7:15:10.538 with Calendar.HOUR_OF_DAY as fragment will return 15 * (equivalent to deprecated date.getMinutes())</li> * <li>January 6, 2008 7:15:10.538 with Calendar.HOUR_OF_DAY as fragment will return 15 * (equivalent to deprecated date.getMinutes())</li> * <li>January 1, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 15</li> * <li>January 6, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 435 (7*60 + 15)</li> * <li>January 16, 2008 7:15:10.538 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in minutes)</li> * </ul> * </p> * * @param date the date to work with, not null * @param fragment the {@code Calendar} field part of date to calculate * @return number of minutes within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInMinutes(Date date, int fragment) { return getFragment(date, fragment, Calendar.MINUTE); } /** * <p>Returns the number of hours within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the hours of any date will only return the number of hours * of the current day (resulting in a number between 0 and 23). This * method will retrieve the number of hours for any fragment. * For example, if you want to calculate the number of hours past this month, * your fragment is Calendar.MONTH. The result will be all hours of the * past day(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a HOUR field will return 0.</p> * * <p> * <ul> * <li>January 1, 2008 7:15:10.538 with Calendar.DAY_OF_YEAR as fragment will return 7 * (equivalent to deprecated date.getHours())</li> * <li>January 6, 2008 7:15:10.538 with Calendar.DAY_OF_YEAR as fragment will return 7 * (equivalent to deprecated date.getHours())</li> * <li>January 1, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 7</li> * <li>January 6, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 127 (5*24 + 7)</li> * <li>January 16, 2008 7:15:10.538 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in hours)</li> * </ul> * </p> * * @param date the date to work with, not null * @param fragment the {@code Calendar} field part of date to calculate * @return number of hours within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInHours(Date date, int fragment) { return getFragment(date, fragment, Calendar.HOUR_OF_DAY); } /** * <p>Returns the number of days within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the days of any date will only return the number of days * of the current month (resulting in a number between 1 and 31). This * method will retrieve the number of days for any fragment. * For example, if you want to calculate the number of days past this year, * your fragment is Calendar.YEAR. The result will be all days of the * past month(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a DAY field will return 0.</p> * * <p> * <ul> * <li>January 28, 2008 with Calendar.MONTH as fragment will return 28 * (equivalent to deprecated date.getDay())</li> * <li>February 28, 2008 with Calendar.MONTH as fragment will return 28 * (equivalent to deprecated date.getDay())</li> * <li>January 28, 2008 with Calendar.YEAR as fragment will return 28</li> * <li>February 28, 2008 with Calendar.YEAR as fragment will return 59</li> * <li>January 28, 2008 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in days)</li> * </ul> * </p> * * @param date the date to work with, not null * @param fragment the {@code Calendar} field part of date to calculate * @return number of days within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInDays(Date date, int fragment) { return getFragment(date, fragment, Calendar.DAY_OF_YEAR); } /** * <p>Returns the number of milliseconds within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the milliseconds of any date will only return the number of milliseconds * of the current second (resulting in a number between 0 and 999). This * method will retrieve the number of milliseconds for any fragment. * For example, if you want to calculate the number of seconds past today, * your fragment is Calendar.DATE or Calendar.DAY_OF_YEAR. The result will * be all seconds of the past hour(s), minutes(s) and second(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a MILLISECOND field will return 0.</p> * * <p> * <ul> * <li>January 1, 2008 7:15:10.538 with Calendar.SECOND as fragment will return 538 * (equivalent to calendar.get(Calendar.MILLISECOND))</li> * <li>January 6, 2008 7:15:10.538 with Calendar.SECOND as fragment will return 538 * (equivalent to calendar.get(Calendar.MILLISECOND))</li> * <li>January 6, 2008 7:15:10.538 with Calendar.MINUTE as fragment will return 10538 * (10*1000 + 538)</li> * <li>January 16, 2008 7:15:10.538 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in milliseconds)</li> * </ul> * </p> * * @param calendar the calendar to work with, not null * @param fragment the {@code Calendar} field part of calendar to calculate * @return number of milliseconds within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInMilliseconds(Calendar calendar, int fragment) { return getFragment(calendar, fragment, Calendar.MILLISECOND); } /** * <p>Returns the number of seconds within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the seconds of any date will only return the number of seconds * of the current minute (resulting in a number between 0 and 59). This * method will retrieve the number of seconds for any fragment. * For example, if you want to calculate the number of seconds past today, * your fragment is Calendar.DATE or Calendar.DAY_OF_YEAR. The result will * be all seconds of the past hour(s) and minutes(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a SECOND field will return 0.</p> * * <p> * <ul> * <li>January 1, 2008 7:15:10.538 with Calendar.MINUTE as fragment will return 10 * (equivalent to calendar.get(Calendar.SECOND))</li> * <li>January 6, 2008 7:15:10.538 with Calendar.MINUTE as fragment will return 10 * (equivalent to calendar.get(Calendar.SECOND))</li> * <li>January 6, 2008 7:15:10.538 with Calendar.DAY_OF_YEAR as fragment will return 26110 * (7*3600 + 15*60 + 10)</li> * <li>January 16, 2008 7:15:10.538 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in seconds)</li> * </ul> * </p> * * @param calendar the calendar to work with, not null * @param fragment the {@code Calendar} field part of calendar to calculate * @return number of seconds within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInSeconds(Calendar calendar, int fragment) { return getFragment(calendar, fragment, Calendar.SECOND); } /** * <p>Returns the number of minutes within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the minutes of any date will only return the number of minutes * of the current hour (resulting in a number between 0 and 59). This * method will retrieve the number of minutes for any fragment. * For example, if you want to calculate the number of minutes past this month, * your fragment is Calendar.MONTH. The result will be all minutes of the * past day(s) and hour(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a MINUTE field will return 0.</p> * * <p> * <ul> * <li>January 1, 2008 7:15:10.538 with Calendar.HOUR_OF_DAY as fragment will return 15 * (equivalent to calendar.get(Calendar.MINUTES))</li> * <li>January 6, 2008 7:15:10.538 with Calendar.HOUR_OF_DAY as fragment will return 15 * (equivalent to calendar.get(Calendar.MINUTES))</li> * <li>January 1, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 15</li> * <li>January 6, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 435 (7*60 + 15)</li> * <li>January 16, 2008 7:15:10.538 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in minutes)</li> * </ul> * </p> * * @param calendar the calendar to work with, not null * @param fragment the {@code Calendar} field part of calendar to calculate * @return number of minutes within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInMinutes(Calendar calendar, int fragment) { return getFragment(calendar, fragment, Calendar.MINUTE); } /** * <p>Returns the number of hours within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the hours of any date will only return the number of hours * of the current day (resulting in a number between 0 and 23). This * method will retrieve the number of hours for any fragment. * For example, if you want to calculate the number of hours past this month, * your fragment is Calendar.MONTH. The result will be all hours of the * past day(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a HOUR field will return 0.</p> * * <p> * <ul> * <li>January 1, 2008 7:15:10.538 with Calendar.DAY_OF_YEAR as fragment will return 7 * (equivalent to calendar.get(Calendar.HOUR_OF_DAY))</li> * <li>January 6, 2008 7:15:10.538 with Calendar.DAY_OF_YEAR as fragment will return 7 * (equivalent to calendar.get(Calendar.HOUR_OF_DAY))</li> * <li>January 1, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 7</li> * <li>January 6, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 127 (5*24 + 7)</li> * <li>January 16, 2008 7:15:10.538 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in hours)</li> * </ul> * </p> * * @param calendar the calendar to work with, not null * @param fragment the {@code Calendar} field part of calendar to calculate * @return number of hours within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInHours(Calendar calendar, int fragment) { return getFragment(calendar, fragment, Calendar.HOUR_OF_DAY); } /** * <p>Returns the number of days within the * fragment. All datefields greater than the fragment will be ignored.</p> * * <p>Asking the days of any date will only return the number of days * of the current month (resulting in a number between 1 and 31). This * method will retrieve the number of days for any fragment. * For example, if you want to calculate the number of days past this year, * your fragment is Calendar.YEAR. The result will be all days of the * past month(s).</p> * * <p>Valid fragments are: Calendar.YEAR, Calendar.MONTH, both * Calendar.DAY_OF_YEAR and Calendar.DATE, Calendar.HOUR_OF_DAY, * Calendar.MINUTE, Calendar.SECOND and Calendar.MILLISECOND * A fragment less than or equal to a DAY field will return 0.</p> * * <p> * <ul> * <li>January 28, 2008 with Calendar.MONTH as fragment will return 28 * (equivalent to calendar.get(Calendar.DAY_OF_MONTH))</li> * <li>February 28, 2008 with Calendar.MONTH as fragment will return 28 * (equivalent to calendar.get(Calendar.DAY_OF_MONTH))</li> * <li>January 28, 2008 with Calendar.YEAR as fragment will return 28 * (equivalent to calendar.get(Calendar.DAY_OF_YEAR))</li> * <li>February 28, 2008 with Calendar.YEAR as fragment will return 59 * (equivalent to calendar.get(Calendar.DAY_OF_YEAR))</li> * <li>January 28, 2008 with Calendar.MILLISECOND as fragment will return 0 * (a millisecond cannot be split in days)</li> * </ul> * </p> * * @param calendar the calendar to work with, not null * @param fragment the {@code Calendar} field part of calendar to calculate * @return number of days within the fragment of date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ public static long getFragmentInDays(Calendar calendar, int fragment) { return getFragment(calendar, fragment, Calendar.DAY_OF_YEAR); } /** * Date-version for fragment-calculation in any unit * * @param date the date to work with, not null * @param fragment the Calendar field part of date to calculate * @param unit the {@code Calendar} field defining the unit * @return number of units within the fragment of the date * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ private static long getFragment(Date date, int fragment, int unit) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return getFragment(calendar, fragment, unit); } /** * Calendar-version for fragment-calculation in any unit * * @param calendar the calendar to work with, not null * @param fragment the Calendar field part of calendar to calculate * @param unit the {@code Calendar} field defining the unit * @return number of units within the fragment of the calendar * @throws IllegalArgumentException if the date is <code>null</code> or * fragment is not supported * @since 2.4 */ private static long getFragment(Calendar calendar, int fragment, int unit) { if (calendar == null) { throw new IllegalArgumentException("The date must not be null"); } long millisPerUnit = getMillisPerUnit(unit); long result = 0; // Fragments bigger than a day require a breakdown to days switch (fragment) { case Calendar.YEAR: result += (calendar.get(Calendar.DAY_OF_YEAR) * MILLIS_PER_DAY) / millisPerUnit; break; case Calendar.MONTH: result += (calendar.get(Calendar.DAY_OF_MONTH) * MILLIS_PER_DAY) / millisPerUnit; break; } switch (fragment) { // Number of days already calculated for these cases case Calendar.YEAR: case Calendar.MONTH: // The rest of the valid cases case Calendar.DAY_OF_YEAR: case Calendar.DATE: result += (calendar.get(Calendar.HOUR_OF_DAY) * MILLIS_PER_HOUR) / millisPerUnit; //$FALL-THROUGH$ case Calendar.HOUR_OF_DAY: result += (calendar.get(Calendar.MINUTE) * MILLIS_PER_MINUTE) / millisPerUnit; //$FALL-THROUGH$ case Calendar.MINUTE: result += (calendar.get(Calendar.SECOND) * MILLIS_PER_SECOND) / millisPerUnit; //$FALL-THROUGH$ case Calendar.SECOND: result += (calendar.get(Calendar.MILLISECOND) * 1) / millisPerUnit; break; case Calendar.MILLISECOND: break;//never useful default: throw new IllegalArgumentException("The fragment " + fragment + " is not supported"); } return result; } /** * Determines if two calendars are equal up to no more than the specified * most significant field. * * @param cal1 the first calendar, not <code>null</code> * @param cal2 the second calendar, not <code>null</code> * @param field the field from {@code Calendar} * @return <code>true</code> if equal; otherwise <code>false</code> * @throws IllegalArgumentException if any argument is <code>null</code> * @see #truncate(Calendar, int) * @see #truncatedEquals(Date, Date, int) * @since 3.0 */ public static boolean truncatedEquals(Calendar cal1, Calendar cal2, int field) { return truncatedCompareTo(cal1, cal2, field) == 0; } /** * Determines if two dates are equal up to no more than the specified * most significant field. * * @param date1 the first date, not <code>null</code> * @param date2 the second date, not <code>null</code> * @param field the field from {@code Calendar} * @return <code>true</code> if equal; otherwise <code>false</code> * @throws IllegalArgumentException if any argument is <code>null</code> * @see #truncate(Date, int) * @see #truncatedEquals(Calendar, Calendar, int) * @since 3.0 */ public static boolean truncatedEquals(Date date1, Date date2, int field) { return truncatedCompareTo(date1, date2, field) == 0; } /** * Determines how two calendars compare up to no more than the specified * most significant field. * * @param cal1 the first calendar, not <code>null</code> * @param cal2 the second calendar, not <code>null</code> * @param field the field from {@code Calendar} * @return a negative integer, zero, or a positive integer as the first * calendar is less than, equal to, or greater than the second. * @throws IllegalArgumentException if any argument is <code>null</code> * @see #truncate(Calendar, int) * @see #truncatedCompareTo(Date, Date, int) * @since 3.0 */ public static int truncatedCompareTo(Calendar cal1, Calendar cal2, int field) { Calendar truncatedCal1 = truncate(cal1, field); Calendar truncatedCal2 = truncate(cal2, field); return truncatedCal1.compareTo(truncatedCal2); } /** * Determines how two dates compare up to no more than the specified * most significant field. * * @param date1 the first date, not <code>null</code> * @param date2 the second date, not <code>null</code> * @param field the field from <code>Calendar</code> * @return a negative integer, zero, or a positive integer as the first * date is less than, equal to, or greater than the second. * @throws IllegalArgumentException if any argument is <code>null</code> * @see #truncate(Calendar, int) * @see #truncatedCompareTo(Date, Date, int) * @since 3.0 */ public static int truncatedCompareTo(Date date1, Date date2, int field) { Date truncatedDate1 = truncate(date1, field); Date truncatedDate2 = truncate(date2, field); return truncatedDate1.compareTo(truncatedDate2); } /** * Returns the number of milliseconds of a {@code Calendar} field, if this is a constant value. * This handles millisecond, second, minute, hour and day (even though days can very in length). * * @param unit a {@code Calendar} field constant which is a valid unit for a fragment * @return the number of milliseconds in the field * @throws IllegalArgumentException if date can't be represented in milliseconds * @since 2.4 */ private static long getMillisPerUnit(int unit) { long result = Long.MAX_VALUE; switch (unit) { case Calendar.DAY_OF_YEAR: case Calendar.DATE: result = MILLIS_PER_DAY; break; case Calendar.HOUR_OF_DAY: result = MILLIS_PER_HOUR; break; case Calendar.MINUTE: result = MILLIS_PER_MINUTE; break; case Calendar.SECOND: result = MILLIS_PER_SECOND; break; case Calendar.MILLISECOND: result = 1; break; default: throw new IllegalArgumentException("The unit " + unit + " cannot be represented is milleseconds"); } return result; } //----------------------------------------------------------------------- /** * <p>Date iterator.</p> */ static class DateIterator implements Iterator<Calendar> { private final Calendar endFinal; private final Calendar spot; /** * Constructs a DateIterator that ranges from one date to another. * * @param startFinal start date (inclusive) * @param endFinal end date (inclusive) */ DateIterator(Calendar startFinal, Calendar endFinal) { super(); this.endFinal = endFinal; spot = startFinal; spot.add(Calendar.DATE, -1); } /** * Has the iterator not reached the end date yet? * * @return <code>true</code> if the iterator has yet to reach the end date */ public boolean hasNext() { return spot.before(endFinal); } /** * Return the next calendar in the iteration * * @return Object calendar for the next date */ public Calendar next() { if (spot.equals(endFinal)) { throw new NoSuchElementException(); } spot.add(Calendar.DATE, 1); return (Calendar) spot.clone(); } /** * Always throws UnsupportedOperationException. * * @throws UnsupportedOperationException * @see java.util.Iterator#remove() */ public void remove() { throw new UnsupportedOperationException(); } } }