/*
* 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;
import java.util.TimeZone;
/**
* <p>A suite of utilities surrounding the use of the
* {@link java.util.Calendar} and {@link java.util.Date} object.</p>
*
* @author <a href="mailto:sergek@lokitech.com">Serge Knystautas</a>
* @author Stephen Colebourne
* @author Janek Bogucki
* @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory</a>
* @author Phil Steitz
* @since 2.0
* @version $Id: DateUtils.java 437554 2006-08-28 06:21:41Z bayard $
*/
public class DateUtils {
/**
* The UTC time zone (often referred to as GMT).
*/
public static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("GMT");
/**
* 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 final static 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 final static int RANGE_WEEK_SUNDAY = 1;
/**
* A week range, starting on Monday.
*/
public final static int RANGE_WEEK_MONDAY = 2;
/**
* A week range, starting on the day focused.
*/
public final static int RANGE_WEEK_RELATIVE = 3;
/**
* A week range, centered around the day focused.
*/
public final static int RANGE_WEEK_CENTER = 4;
/**
* A month range, the week starting on Sunday.
*/
public final static int RANGE_MONTH_SUNDAY = 5;
/**
* A month range, the week starting on Monday.
*/
public final static int RANGE_MONTH_MONDAY = 6;
/**
* <p><code>DateUtils</code> instances should NOT be constructed in
* standard programming. Instead, the class should be used as
* <code>DateUtils.parse(str);</code>.</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) == cal2.get(Calendar.HOUR) &&
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 sucessful 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
* @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
*/
public static Date parseDate(String str, String[] parsePatterns) throws ParseException {
if (str == null || parsePatterns == null) {
throw new IllegalArgumentException("Date and Patterns must not be null");
}
SimpleDateFormat parser = null;
ParsePosition pos = new ParsePosition(0);
for (int i = 0; i < parsePatterns.length; i++) {
if (i == 0) {
parser = new SimpleDateFormat(parsePatterns[0]);
} else {
parser.applyPattern(parsePatterns[i]);
}
pos.setIndex(0);
Date date = parser.parse(str, pos);
if (date != null && pos.getIndex() == str.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 date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object 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 date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object 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 date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object 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 date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object 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 date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object 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 date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object 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 date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object 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 date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object 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 date object 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 date object with the amount added
* @throws IllegalArgumentException if the date is null
*/
public 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();
}
//-----------------------------------------------------------------------
/**
* <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
* @param field the field from <code>Calendar</code>
* or <code>SEMI_MONTH</code>
* @return the rounded date
* @throws IllegalArgumentException if the date is <code>null</code>
* @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, true);
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
* @param field the field from <code>Calendar</code>
* or <code>SEMI_MONTH</code>
* @return the rounded date (a different object)
* @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, true);
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 Date or Calendar
* @param field the field from <code>Calendar</code>
* or <code>SEMI_MONTH</code>
* @return the rounded date
* @throws IllegalArgumentException if the date is <code>null</code>
* @throws ClassCastException if the object type is not a <code>Date</code>
* or <code>Calendar</code>
* @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
* @param field the field from <code>Calendar</code>
* or <code>SEMI_MONTH</code>
* @return the rounded date
* @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, false);
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
* @param field the field from <code>Calendar</code>
* or <code>SEMI_MONTH</code>
* @return the rounded date (a different object)
* @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, false);
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</code>
* or <code>Calendar</code>
* @param field the field from <code>Calendar</code>
* or <code>SEMI_MONTH</code>
* @return the rounded date
* @throws IllegalArgumentException if the date
* is <code>null</code>
* @throws ClassCastException if the object type is not a
* <code>Date</code> or <code>Calendar</code>
* @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>Internal calculation method.</p>
*
* @param val the calendar
* @param field the field constant
* @param round true to round, false to truncate
* @throws ArithmeticException if the year is over 280 million
*/
private static void modify(Calendar val, int field, boolean round) {
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 (!round || millisecs < 500) {
time = time - millisecs;
if (field == Calendar.SECOND) {
done = true;
}
}
// truncate seconds
int seconds = val.get(Calendar.SECOND);
if (!done && (!round || seconds < 30)) {
time = time - (seconds * 1000L);
if (field == Calendar.MINUTE) {
done = true;
}
}
// truncate minutes
int minutes = val.get(Calendar.MINUTE);
if (!done && (!round || 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 i = 0; i < fields.length; i++) {
for (int j = 0; j < fields[i].length; j++) {
if (fields[i][j] == field) {
//This is our field... we stop looping
if (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);
}
} else {
//We need at add one to this field since the
// last number causes us to round up
val.add(fields[i][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 (fields[i][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 (fields[i][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(fields[i][0]);
int max = val.getActualMaximum(fields[i][0]);
//Calculate the offset from the minimum allowed value
offset = val.get(fields[i][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(fields[i][0], val.get(fields[i][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, which always returns Calendar instances
* @throws IllegalArgumentException if the date is <code>null</code>
* @throws IllegalArgumentException if the rangeStyle is invalid
*/
public static Iterator 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
* @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
* @throws IllegalArgumentException if the date is <code>null</code>
* @throws IllegalArgumentException if the rangeStyle is invalid
*/
public static Iterator 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</code> or <code>Calendar</code>
* @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
* @throws IllegalArgumentException if the date
* is <code>null</code>
* @throws ClassCastException if the object type is
* not a <code>Date</code> or <code>Calendar</code>
*/
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>Date iterator.</p>
*/
static class DateIterator implements Iterator {
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 (not 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 Object next() {
if (spot.equals(endFinal)) {
throw new NoSuchElementException();
}
spot.add(Calendar.DATE, 1);
return spot.clone();
}
/**
* Always throws UnsupportedOperationException.
*
* @throws UnsupportedOperationException
* @see java.util.Iterator#remove()
*/
public void remove() {
throw new UnsupportedOperationException();
}
}
//-------------------------------------------------------------------------
// Deprecated int constants
// TODO: Remove in 3.0
/**
* Number of milliseconds in a standard second.
*
* @deprecated Use MILLIS_PER_SECOND. This will be removed in Commons Lang 3.0.
*/
public static final int MILLIS_IN_SECOND = 1000;
/**
* Number of milliseconds in a standard minute.
*
* @deprecated Use MILLIS_PER_MINUTE. This will be removed in Commons Lang 3.0.
*/
public static final int MILLIS_IN_MINUTE = 60 * 1000;
/**
* Number of milliseconds in a standard hour.
*
* @deprecated Use MILLIS_PER_HOUR. This will be removed in Commons Lang 3.0.
*/
public static final int MILLIS_IN_HOUR = 60 * 60 * 1000;
/**
* Number of milliseconds in a standard day.
*
* @deprecated Use MILLIS_PER_DAY. This will be removed in Commons Lang 3.0.
*/
public static final int MILLIS_IN_DAY = 24 * 60 * 60 * 1000;
}