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java.lang.Object com.ibm.icu.util.LocalePriorityList
public class LocalePriorityList
Provides an immutable list of languages (locales) in priority order. The string format is based on the Accept-Language format "http://www.ietf.org/rfc/rfc2616.txt", such as "af, en, fr;q=0.9". Syntactically it is slightly more lenient, in allowing extra whitespace between elements, extra commas, and more than 3 decimals (on input), and pins between 0 and 1.
In theory, Accept-Language indicates the relative 'quality' of each item, but in practice, all of the browsers just take an ordered list, like "en, fr, de", and synthesize arbitrary quality values that put these in the right order, like: "en, fr;q=0.7, de;q=0.3". The quality values in these de facto semantics thus have nothing to do with the relative qualities of the original. Accept-Language also doesn't specify the interpretation of multiple instances, eg what "en, fr, en;q=.5" means.
There are various ways to build a LanguagePriorityList, such as using the following equivalent patterns:
list = LanguagePriorityList.add("af, en, fr;q=0.9").build(); list2 = LanguagePriorityList .add(ULocale.forString("af")) .add(ULocale.ENGLISH) .add(ULocale.FRENCH, 0.9d) .build();When the list is built, the internal values are sorted in descending order by weight, and then by input order. That is, if two languages have the same weight, the first one in the original order comes first. If exactly the same language tag appears multiple times, the last one wins. There are two options when building. If preserveWeights are on, then "de;q=0.3, ja;q=0.3, en, fr;q=0.7, de " would result in the following:
en;q=1.0 de;q=1.0 fr;q=0.7 ja;q=0.3If it is off (the default), then all weights are reset to 1.0 after reordering. This is to match the effect of the Accept-Language semantics as used in browsers, and results in the following: *
en;q=1.0 de;q=1.0 fr;q=1.0 ja;q=1.0
Nested Class Summary | |
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static class |
LocalePriorityList.Builder
Class used for building LanguagePriorityLists |
Method Summary | |
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static LocalePriorityList.Builder |
add(LocalePriorityList languagePriorityList)
Add a language priority list. |
static LocalePriorityList.Builder |
add(String acceptLanguageString)
Add language codes to the list being built, using a string in rfc2616 (lenient) format, where each language is a valid ULocale . |
static LocalePriorityList.Builder |
add(ULocale languageCode)
Add a language code to the list being built, with weight 1.0. |
static LocalePriorityList.Builder |
add(ULocale languageCode,
double weight)
Add a language code to the list being built, with specified weight. |
boolean |
equals(Object o)
|
Double |
getWeight(ULocale language)
Return the weight for a given language, or null if there is none. |
int |
hashCode()
|
Iterator<ULocale> |
iterator()
|
String |
toString()
|
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Method Detail |
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public static LocalePriorityList.Builder add(ULocale languageCode)
languageCode
- locale/language to be added
public static LocalePriorityList.Builder add(ULocale languageCode, double weight)
languageCode
- locale/language to be addedweight
- value from 0.0 to 1.0
public static LocalePriorityList.Builder add(LocalePriorityList languagePriorityList)
languagePriorityList
- list to add all the members of
public static LocalePriorityList.Builder add(String acceptLanguageString)
ULocale
.
acceptLanguageString
- String in rfc2616 format (but leniently parsed)
public Double getWeight(ULocale language)
language
- to get weight of
public String toString()
toString
in class Object
public Iterator<ULocale> iterator()
iterator
in interface Iterable<ULocale>
public boolean equals(Object o)
equals
in class Object
public int hashCode()
hashCode
in class Object
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