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Showing content from http://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/Locale.FilteringMode.html below:

Locale.FilteringMode (Java SE 15 & JDK 15)

All Implemented Interfaces:: Serializable, Comparable<Locale.FilteringMode>, Constable

Enclosing class:: Locale

public static enum Locale.FilteringMode
extends Enum<Locale.FilteringMode>

This enum provides constants to select a filtering mode for locale matching. Refer to

RFC 4647 Matching of Language Tags

for details.

As an example, think of two Language Priority Lists each of which includes only one language range and a set of following language tags:

    de (German)
    de-DE (German, Germany)
    de-Deva (German, in Devanagari script)
    de-Deva-DE (German, in Devanagari script, Germany)
    de-DE-1996 (German, Germany, orthography of 1996)
    de-Latn-DE (German, in Latin script, Germany)
    de-Latn-DE-1996 (German, in Latin script, Germany, orthography of 1996)

The filtering method will behave as follows:

Filtering method behavior Filtering Mode Language Priority List: "de-DE" Language Priority List: "de-*-DE" AUTOSELECT_FILTERING Performs basic filtering and returns "de-DE" and "de-DE-1996". Performs extended filtering and returns "de-DE", "de-Deva-DE", "de-DE-1996", "de-Latn-DE", and "de-Latn-DE-1996". EXTENDED_FILTERING Performs extended filtering and returns "de-DE", "de-Deva-DE", "de-DE-1996", "de-Latn-DE", and "de-Latn-DE-1996". Same as above. IGNORE_EXTENDED_RANGES Performs basic filtering and returns "de-DE" and "de-DE-1996". Performs basic filtering and returns null because nothing matches. MAP_EXTENDED_RANGES Same as above. Performs basic filtering and returns "de-DE" and "de-DE-1996" because "de-*-DE" is mapped to "de-DE". REJECT_EXTENDED_RANGES Same as above. Throws IllegalArgumentException because "de-*-DE" is not a valid basic language range.

Since:: 1.8
See Also:: Locale.filter(List, Collection, FilteringMode), Locale.filterTags(List, Collection, FilteringMode)

Nested Class Summary
Enum Constant Summary Enum Constants Enum Constant Description AUTOSELECT_FILTERING
Specifies automatic filtering mode based on the given Language Priority List consisting of language ranges.
EXTENDED_FILTERING
Specifies extended filtering.
IGNORE_EXTENDED_RANGES
Specifies basic filtering: Note that any extended language ranges included in the given Language Priority List are ignored.
MAP_EXTENDED_RANGES
Specifies basic filtering: If any extended language ranges are included in the given Language Priority List, they are mapped to the basic language range.
REJECT_EXTENDED_RANGES
Specifies basic filtering: If any extended language ranges are included in the given Language Priority List, the list is rejected and the filtering method throws
IllegalArgumentException
.
Method Summary Methods declared in class java.lang.Enumclone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Enum Constant Details
- AUTOSELECT_FILTERING
  Specifies automatic filtering mode based on the given Language Priority List consisting of language ranges. If all of the ranges are basic, basic filtering is selected. Otherwise, extended filtering is selected.
- EXTENDED_FILTERING
  Specifies extended filtering.
- IGNORE_EXTENDED_RANGES
  Specifies basic filtering: Note that any extended language ranges included in the given Language Priority List are ignored.
- MAP_EXTENDED_RANGES
  Specifies basic filtering: If any extended language ranges are included in the given Language Priority List, they are mapped to the basic language range. Specifically, a language range starting with a subtag "*" is treated as a language range "*". For example, "*-US" is treated as "*". If "*" is not the first subtag, "*" and extra "-" are removed. For example, "ja-*-JP" is mapped to "ja-JP".
- REJECT_EXTENDED_RANGES
  Specifies basic filtering: If any extended language ranges are included in the given Language Priority List, the list is rejected and the filtering method throws
  IllegalArgumentException
  .
Method Details
- values
  Returns an array containing the constants of this enum type, in the order they are declared.
  
  Returns:
  
  an array containing the constants of this enum type, in the order they are declared
- valueOf
  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
  
  Parameters:
  
  name - the name of the enum constant to be returned.
  
  Returns:
  
  the enum constant with the specified name
  
  Throws:
  
  IllegalArgumentException - if this enum type has no constant with the specified name
  
  NullPointerException - if the argument is null

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