org.apache.jena.riot.web

Class LangTag

java.lang.Object

org.apache.jena.riot.web.LangTag

public class LangTag
extends Object

Language tags: support for parsing and canonicalization of case. Grandfathered forms ("i-") are left untouched. Unsupported or syntactically illegal forms are handled in canonicalization by doing nothing.

• Language tags syntax: RFC 4646
• Matching Language tags: RFC 4647
• Language tags syntax: RFC 5646

Field Summary

Fields

Modifier and Type	Field and Description
static int	idxExtension Index of all extensions
static int	idxLanguage Index of the language part
static int	idxRegion Index of the region part
static int	idxScript Index of the script part
static int	idxVariant Index of the variant part

Method Summary

Methods

Modifier and Type	Method and Description
static String	canonical(String str) Canonicalize with the rules of RFC 4646
static String	canonical(String[] parts) Canonicalize with the rules of RFC 4646 "In this format, all non-initial two-letter subtags are uppercase, all non-initial four-letter subtags are titlecase, and all other subtags are lowercase." In addition, leave extensions unchanged.
static boolean	check(String languageTag) Validate - basic syntax check for a language tags: [a-zA-Z]+ ('-' [a-zA-Z0-9]+)*
static void	main(String... args)
static String[]	parse(String languageTag) Parse a langtag string and return it's parts in canonical case.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

idxLanguage

public static final int idxLanguage

Index of the language part

See Also:

Constant Field Values

idxScript

public static final int idxScript

Index of the script part

See Also:

Constant Field Values

idxRegion

public static final int idxRegion

Index of the region part

See Also:

Constant Field Values

idxVariant

public static final int idxVariant

Index of the variant part

See Also:

Constant Field Values

idxExtension

public static final int idxExtension

Index of all extensions

See Also:

Constant Field Values

Method Detail

check

public static boolean check(String languageTag)

Validate - basic syntax check for a language tags: [a-zA-Z]+ ('-' [a-zA-Z0-9]+)*

parse

public static String[] parse(String languageTag)

Parse a langtag string and return it's parts in canonical case. See constants for the array contents. Parts not present cause a null in the return array.

Returns:

Langtag parts, or null if the input string does not poarse as a lang tag.

canonical

public static String canonical(String str)

Canonicalize with the rules of RFC 4646

canonical

public static String canonical(String[] parts)

Canonicalize with the rules of RFC 4646 "In this format, all non-initial two-letter subtags are uppercase, all non-initial four-letter subtags are titlecase, and all other subtags are lowercase." In addition, leave extensions unchanged.

main

public static void main(String... args)