DateIntervalInfo (ICU4J 76)

java.lang.Object
- com.ibm.icu.text.DateIntervalInfo

All Implemented Interfaces:

Freezable<DateIntervalInfo>, Serializable, Cloneable
```
public class DateIntervalInfo
extends Object
implements Cloneable, Freezable<DateIntervalInfo>, Serializable
```
DateIntervalInfo is a public class for encapsulating localizable date time interval patterns. It is used by DateIntervalFormat.
For most users, ordinary use of DateIntervalFormat does not need to create DateIntervalInfo object directly. DateIntervalFormat will take care of it when creating a date interval formatter when user pass in skeleton and locale.
For power users, who want to create their own date interval patterns, or want to re-set date interval patterns, they could do so by directly creating DateIntervalInfo and manipulating it.
Logically, the interval patterns are mappings from (skeleton, the_largest_different_calendar_field) to (date_interval_pattern).
A skeleton
1. only keeps the field pattern letter and ignores all other parts in a pattern, such as space, punctuations, and string literals.
2. hides the order of fields.
3. might hide a field's pattern letter length. For those non-digit calendar fields, the pattern letter length is important, such as MMM, MMMM, and MMMMM; EEE and EEEE, and the field's pattern letter length is honored. For the digit calendar fields, such as M or MM, d or dd, yy or yyyy, the field pattern length is ignored and the best match, which is defined in date time patterns, will be returned without honor the field pattern letter length in skeleton.
The calendar fields we support for interval formatting are: year, month, date, day-of-week, am-pm, hour, hour-of-day, minute, and second (though we do not currently have specific intervalFormat data for skeletons with seconds). Those calendar fields can be defined in the following order: year > month > date > am-pm > hour > minute > second The largest different calendar fields between 2 calendars is the first different calendar field in above order. For example: the largest different calendar fields between "Jan 10, 2007" and "Feb 20, 2008" is year.
There is a set of pre-defined static skeleton strings. There are pre-defined interval patterns for those pre-defined skeletons in locales' resource files. For example, for a skeleton YEAR_ABBR_MONTH_DAY, which is "yMMMd", in en_US, if the largest different calendar field between date1 and date2 is "year", the date interval pattern is "MMM d, yyyy - MMM d, yyyy", such as "Jan 10, 2007 - Jan 10, 2008". If the largest different calendar field between date1 and date2 is "month", the date interval pattern is "MMM d - MMM d, yyyy", such as "Jan 10 - Feb 10, 2007". If the largest different calendar field between date1 and date2 is "day", the date interval pattern is ""MMM d-d, yyyy", such as "Jan 10-20, 2007". For date skeleton, the interval patterns when year, or month, or date is different are defined in resource files. For time skeleton, the interval patterns when am/pm, or hour, or minute is different are defined in resource files.
There are 2 dates in interval pattern. For most locales, the first date in an interval pattern is the earlier date. There might be a locale in which the first date in an interval pattern is the later date. We use fallback format for the default order for the locale. For example, if the fallback format is "{0} - {1}", it means the first date in the interval pattern for this locale is earlier date. If the fallback format is "{1} - {0}", it means the first date is the later date. For a particular interval pattern, the default order can be overridden by prefixing "latestFirst:" or "earliestFirst:" to the interval pattern. For example, if the fallback format is "{0}-{1}", but for skeleton "yMMMd", the interval pattern when day is different is "latestFirst:d-d MMM yy", it means by default, the first date in interval pattern is the earlier date. But for skeleton "yMMMd", when day is different, the first date in "d-d MMM yy" is the later date.
The recommended way to create a DateIntervalFormat object is to pass in the locale. By using a Locale parameter, the DateIntervalFormat object is initialized with the pre-defined interval patterns for a given or default locale.
Users can also create DateIntervalFormat object by supplying their own interval patterns. It provides flexibility for power usage.
After a DateIntervalInfo object is created, clients may modify the interval patterns using setIntervalPattern function as so desired. Currently, users can only set interval patterns when the following calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, MINUTE, SECOND, and MILLISECOND. Interval patterns when other calendar fields are different is not supported.
DateIntervalInfo objects are cloneable. When clients obtain a DateIntervalInfo object, they can feel free to modify it as necessary.
DateIntervalInfo are not expected to be subclassed. Data for a calendar is loaded out of resource bundles. Through ICU 4.4, date interval patterns are only supported in the Gregorian calendar; non-Gregorian calendars are supported from ICU 4.4.1.
See Also:

Serialized Form

Status:
Stable ICU 4.0.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`DateIntervalInfo.PatternInfo` PatternInfo class saves the first and second part of interval pattern, and whether the interval pattern is earlier date first.

Constructor Summary

Constructors
Constructor and Description
`DateIntervalInfo()` Deprecated. This API is ICU internal only.
`DateIntervalInfo(Locale locale)` Construct DateIntervalInfo for the given `Locale`.
`DateIntervalInfo(ULocale locale)` Construct DateIntervalInfo for the given locale,

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`Object`	`clone()` Clone this object.
`DateIntervalInfo`	`cloneAsThawed()` Provides for the clone operation.
`boolean`	`equals(Object a)` Override equals
`DateIntervalInfo`	`freeze()` Freezes the object.
`static DateIntervalInfo.PatternInfo`	`genPatternInfo(String intervalPattern, boolean laterDateFirst)` Deprecated. This API is ICU internal only.
`boolean`	`getDefaultOrder()` Get default order -- whether the first date in pattern is later date or not.
`String`	`getFallbackIntervalPattern()` Get the fallback interval pattern.
`DateIntervalInfo.PatternInfo`	`getIntervalPattern(String skeleton, int field)` Get the interval pattern given the largest different calendar field.
`Map<String,Set<String>>`	`getPatterns()` Deprecated. This API is ICU internal only.
`Map<String,Map<String,DateIntervalInfo.PatternInfo>>`	`getRawPatterns()` Deprecated. This API is ICU internal only.
`int`	`hashCode()` Override hashcode
`boolean`	`isFrozen()` Determines whether the object has been frozen or not.
`void`	`setFallbackIntervalPattern(String fallbackPattern)` Re-set the fallback interval pattern.
`void`	`setIntervalPattern(String skeleton, int lrgDiffCalUnit, String intervalPattern)` Provides a way for client to build interval patterns.

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DateIntervalInfo
```
@Deprecated
public DateIntervalInfo()
```
    Deprecated. This API is ICU internal only.
    
    Create empty instance. It does not initialize any interval patterns except that it initialize default fall-back pattern as "{0} - {1}", which can be reset by setFallbackIntervalPattern(). It should be followed by setFallbackIntervalPattern() and setIntervalPattern(), and is recommended to be used only for power users who wants to create their own interval patterns and use them to create date interval formatter.
    
    Status:
    Internal. This API is ICU internal only.
  - DateIntervalInfo
```
public DateIntervalInfo(ULocale locale)
```
    Construct DateIntervalInfo for the given locale,
    
    Parameters:
    
    locale - the interval patterns are loaded from the appropriate calendar data (specified calendar or default calendar) in this locale.
    
    Status:
    Stable ICU 4.0.
  - DateIntervalInfo
```
public DateIntervalInfo(Locale locale)
```
    Construct DateIntervalInfo for the given Locale.
    
    Parameters:
    
    locale - the interval patterns are loaded from the appropriate calendar data (specified calendar or default calendar) in this locale.
    
    Status:
    Stable ICU 54.
- Method Detail
  - setIntervalPattern
```
public void setIntervalPattern(String skeleton,
                               int lrgDiffCalUnit,
                               String intervalPattern)
```
    Provides a way for client to build interval patterns. User could construct DateIntervalInfo by providing a list of skeletons and their patterns.
    For example:
```
 DateIntervalInfo dIntervalInfo = new DateIntervalInfo();
 dIntervalInfo.setIntervalPattern("yMd", Calendar.YEAR, "'from' yyyy-M-d 'to' yyyy-M-d");
 dIntervalInfo.setIntervalPattern("yMMMd", Calendar.MONTH, "'from' yyyy MMM d 'to' MMM d");
 dIntervalInfo.setIntervalPattern("yMMMd", Calendar.DAY, "yyyy MMM d-d");
 dIntervalInfo.setFallbackIntervalPattern("{0} ~ {1}");
 
```
    Restriction: Currently, users can only set interval patterns when the following calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, MINUTE, SECOND, and MILLISECOND. Interval patterns when other calendar fields are different are not supported.
    Parameters:
    
    skeleton - the skeleton on which interval pattern based
    
    lrgDiffCalUnit - the largest different calendar unit.
    
    intervalPattern - the interval pattern on the largest different calendar unit. For example, if lrgDiffCalUnit is "year", the interval pattern for en_US when year is different could be "'from' yyyy 'to' yyyy".
    
    Throws:
    
    IllegalArgumentException - if setting interval pattern on a calendar field that is smaller than the MINIMUM_SUPPORTED_CALENDAR_FIELD
    
    UnsupportedOperationException - if the object is frozen
    
    Status:
    Stable ICU 4.0.
  - genPatternInfo
```
@Deprecated
public static DateIntervalInfo.PatternInfo genPatternInfo(String intervalPattern,
                                                                      boolean laterDateFirst)
```
    Deprecated. This API is ICU internal only.
    
    Break interval patterns as 2 part and save them into pattern info.
    
    Parameters:
    
    intervalPattern - interval pattern
    
    laterDateFirst - whether the first date in intervalPattern is earlier date or later date
    
    Returns:
    
    pattern info object
    
    Status:
    Internal. This API is ICU internal only.
  - getIntervalPattern
```
public DateIntervalInfo.PatternInfo getIntervalPattern(String skeleton,
                                                       int field)
```
    Get the interval pattern given the largest different calendar field.
    
    Parameters:
    
    skeleton - the skeleton
    
    field - the largest different calendar field
    
    Returns:
    
    interval pattern return null if interval pattern is not found.
    
    Throws:
    
    IllegalArgumentException - if getting interval pattern on a calendar field that is smaller than the MINIMUM_SUPPORTED_CALENDAR_FIELD
    
    Status:
    Stable ICU 4.0.
  - getFallbackIntervalPattern
```
public String getFallbackIntervalPattern()
```
    Get the fallback interval pattern.
    
    Returns:
    
    fallback interval pattern
    
    Status:
    Stable ICU 4.0.
  - setFallbackIntervalPattern
```
public void setFallbackIntervalPattern(String fallbackPattern)
```
    Re-set the fallback interval pattern. In construction, default fallback pattern is set as "{0} - {1}". And constructor taking locale as parameter will set the fallback pattern as what defined in the locale resource file. This method provides a way for user to replace the fallback pattern.
    
    Parameters:
    
    fallbackPattern - fall-back interval pattern.
    
    Throws:
    
    UnsupportedOperationException - if the object is frozen
    
    IllegalArgumentException - if there is no pattern {0} or pattern {1} in fallbakckPattern
    
    Status:
    Stable ICU 4.0.
  - getDefaultOrder
```
public boolean getDefaultOrder()
```
    Get default order -- whether the first date in pattern is later date or not. return default date ordering in interval pattern. true if the first date in pattern is later date, false otherwise.
    
    Status:
    Stable ICU 4.0.
  - clone
```
public Object clone()
```
    Clone this object.
    
    Overrides:
    
    clone in class Object
    
    Returns:
    
    a copy of the object
    
    Status:
    Stable ICU4.0.
  - isFrozen
```
public boolean isFrozen()
```
    Determines whether the object has been frozen or not.
    
    Specified by:
    
    isFrozen in interface Freezable<DateIntervalInfo>
    
    Status:
    Stable ICU 4.0.
  - freeze
```
public DateIntervalInfo freeze()
```
    Freezes the object.
    
    Specified by:
    
    freeze in interface Freezable<DateIntervalInfo>
    
    Returns:
    
    the object itself.
    
    Status:
    Stable ICU 4.4.
  - cloneAsThawed
```
public DateIntervalInfo cloneAsThawed()
```
    Provides for the clone operation. Any clone is initially unfrozen.
    
    Specified by:
    
    cloneAsThawed in interface Freezable<DateIntervalInfo>
    
    Status:
    Stable ICU 4.4.
  - equals
```
public boolean equals(Object a)
```
    Override equals
    
    Overrides:
    
    equals in class Object
    
    Status:
    Stable ICU 4.0.
  - hashCode
```
public int hashCode()
```
    Override hashcode
    
    Overrides:
    
    hashCode in class Object
    
    Status:
    Stable ICU 4.0.
  - getPatterns
```
@Deprecated
public Map<String,Set<String>> getPatterns()
```
    Deprecated. This API is ICU internal only.
    
    Status:
    Internal. This API is ICU internal only.
  - getRawPatterns
```
@Deprecated
public Map<String,Map<String,DateIntervalInfo.PatternInfo>> getRawPatterns()
```
    Deprecated. This API is ICU internal only.
    
    Get the internal patterns, with a deep clone for safety.
    
    Status:
    Internal. This API is ICU internal only.

Class DateIntervalInfo

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

DateIntervalInfo

DateIntervalInfo

DateIntervalInfo

Method Detail

setIntervalPattern

genPatternInfo

getIntervalPattern

getFallbackIntervalPattern

setFallbackIntervalPattern

getDefaultOrder

clone

isFrozen

freeze

cloneAsThawed

equals

hashCode

getPatterns

getRawPatterns