BreakIterator (Платформа Java SE 7)

java.lang. Объект
- java.text. BreakIterator

Все Реализованные Интерфейсы:

Cloneable
```
public abstract class BreakIterator
extends Object
implements Cloneable
```
BreakIterator класс реализует методы для того, чтобы найти расположение границ в тексте. Экземпляры BreakIterator поддержите текущую позицию и сканирование по тексту, возвращая индекс символов, где границы происходят. Внутренне, BreakIterator текст сканирований, используя a CharacterIterator, и таким образом в состоянии отсканировать текст, сохраненный любым объектом, реализовывая тот протокол. A StringCharacterIterator используется, чтобы отсканировать String объекты, к которым передают setText.
Вы используете методы фабрики, обеспеченные этим классом, чтобы создать экземпляры различных типов повреждения iterators. В частности используйте getWordInstance, getLineInstance, getSentenceInstance, и getCharacterInstance создать BreakIterators, которые выполняют слово, строку, предложение, и символьный граничный анализ соответственно. Сингл BreakIterator может работать только над одним модулем (слово, строка, предложение, и так далее). Следует использовать различный iterator для каждого граничного анализа модуля, который Вы хотите выполнить.
Граничный анализ строки определяет, где текстовая строка может быть повреждена когда обертывание строки. Механизм правильно обрабатывает пунктуацию и написанные через дефис слова. Фактическое повреждение строки должно также рассмотреть доступную ширину строки и обрабатывается высокоуровневым программным обеспечением.
Граничный анализ предложения позволяет выбор с корректной интерпретацией периодов в пределах чисел и сокращений, и запаздывающих знаков препинания, таких как кавычки и круглые скобки.
Граничный анализ Word используется поиском и функциями замены, так же как в пределах приложений редактирования текста, которые позволяют пользователю выбирать слова двойным щелчком. Выбор Word обеспечивает корректную интерпретацию знаков препинания в пределах и после слов. У символов, которые не являются частью слова, такого как символы или знаки препинания, есть разрывы слова с обеих сторон.
Символьный граничный анализ позволяет пользователям взаимодействовать с символами, как они ожидают к, например, перемещая курсор через текстовую строку. Символьный граничный анализ обеспечивает корректную навигацию через символьные строки, независимо от того, как символ сохранен. Возвращенные границы могут быть таковыми из дополнительных символов, последовательностей комбинированного символа, или кластеров лигатуры. Например, символ с диакритическим знаком мог бы быть сохранен как базовый символ и диакритический знак. То, что пользователи рассматривают, чтобы быть символом, может отличаться между языками.
BreakIterator экземпляры, возвращенные методами фабрики этого класса, предназначаются для использования с естественными языками только, не для текста языка программирования. Однако возможно определить подклассы, которые маркируют язык программирования.
Примеры:
Создание и использование текстовых границ:
```
 public static void main(String args[]) {
      if (args.length == 1) {
          String stringToExamine = args[0];
          //print each word in order
          BreakIterator boundary = BreakIterator.getWordInstance();
          boundary.setText(stringToExamine);
          printEachForward(boundary, stringToExamine);
          //print each sentence in reverse order
          boundary = BreakIterator.getSentenceInstance(Locale.US);
          boundary.setText(stringToExamine);
          printEachBackward(boundary, stringToExamine);
          printFirst(boundary, stringToExamine);
          printLast(boundary, stringToExamine);
      }
 }
 
```
Напечатайте каждый элемент в порядке:
```
 public static void printEachForward(BreakIterator boundary, String source) {
     int start = boundary.first();
     for (int end = boundary.next();
          end != BreakIterator.DONE;
          start = end, end = boundary.next()) {
          System.out.println(source.substring(start,end));
     }
 }
 
```
Напечатайте каждый элемент в обратном порядке:
```
 public static void printEachBackward(BreakIterator boundary, String source) {
     int end = boundary.last();
     for (int start = boundary.previous();
          start != BreakIterator.DONE;
          end = start, start = boundary.previous()) {
         System.out.println(source.substring(start,end));
     }
 }
 
```
Напечатайте первый элемент:
```
 public static void printFirst(BreakIterator boundary, String source) {
     int start = boundary.first();
     int end = boundary.next();
     System.out.println(source.substring(start,end));
 }
 
```
Печать последний элемент:
```
 public static void printLast(BreakIterator boundary, String source) {
     int end = boundary.last();
     int start = boundary.previous();
     System.out.println(source.substring(start,end));
 }
 
```
Напечатайте элемент в указанной позиции:
```
 public static void printAt(BreakIterator boundary, int pos, String source) {
     int end = boundary.following(pos);
     int start = boundary.previous();
     System.out.println(source.substring(start,end));
 }
 
```
Найдите следующее слово:
```
 public static int nextWordStartAfter(int pos, String text) {
     BreakIterator wb = BreakIterator.getWordInstance();
     wb.setText(text);
     int last = wb.following(pos);
     int current = wb.next();
     while (current != BreakIterator.DONE) {
         for (int p = last; p < current; p++) {
             if (Character.isLetter(text.codePointAt(p)))
                 return last;
         }
         last = current;
         current = wb.next();
     }
     return BreakIterator.DONE;
 }
 
```
(The iterator returned by BreakIterator.getWordInstance() is unique in that the break positions it returns don't represent both the start and end of the thing being iterated over. That is, a sentence-break iterator returns breaks that each represent the end of one sentence and the beginning of the next. With the word-break iterator, the characters between two boundaries might be a word, or they might be the punctuation or whitespace between two words. The above code uses a simple heuristic to determine which boundary is the beginning of a word: If the characters between this boundary and the next boundary include at least one letter (this can be an alphabetical letter, a CJK ideograph, a Hangul syllable, a Kana character, etc.), then the text between this boundary and the next is a word; otherwise, it's the material between words.)
See Also:
CharacterIterator

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`СДЕЛАННЫЙ` DONE is returned by previous(), next(), next(int), preceding(int) and following(int) when either the first or last text boundary has been reached.

Constructor Summary

Constructors
Modifier Constructor and Description

protected BreakIterator()
Constructor.

Constructors
Modifier	Constructor and Description
`protected`	`BreakIterator()` Constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`Объект`	`clone()` Create a copy of this iterator
`abstract int`	`current()` Returns character index of the text boundary that was most recently returned by next(), next(int), previous(), first(), last(), following(int) or preceding(int).
`abstract int`	`first()` Returns the first boundary.
`abstract int`	`following(int offset)` Returns the first boundary following the specified character offset.
`static Locale[]`	`getAvailableLocales()` Returns an array of all locales for which the `get*Instance` methods of this class can return localized instances.
`static BreakIterator`	`getCharacterInstance()` Returns a new `BreakIterator` instance for character breaks for the default locale.
`static BreakIterator`	`getCharacterInstance(Locale locale)` Returns a new `BreakIterator` instance for character breaks for the given locale.
`static BreakIterator`	`getLineInstance()` Returns a new `BreakIterator` instance for line breaks for the default locale.
`static BreakIterator`	`getLineInstance(Locale locale)` Returns a new `BreakIterator` instance for line breaks for the given locale.
`static BreakIterator`	`getSentenceInstance()` Returns a new `BreakIterator` instance for sentence breaks for the default locale.
`static BreakIterator`	`getSentenceInstance(Locale locale)` Returns a new `BreakIterator` instance for sentence breaks for the given locale.
`abstract CharacterIterator`	`getText()` Get the text being scanned
`static BreakIterator`	`getWordInstance()` Returns a new `BreakIterator` instance for word breaks for the default locale.
`static BreakIterator`	`getWordInstance(Locale locale)` Returns a new `BreakIterator` instance for word breaks for the given locale.
`boolean`	`isBoundary(int offset)` Returns true if the specified character offset is a text boundary.
`abstract int`	`last()` Returns the last boundary.
`abstract int`	`next()` Returns the boundary following the current boundary.
`abstract int`	`next(int n)` Returns the nth boundary from the current boundary.
`int`	`preceding(int offset)` Returns the last boundary preceding the specified character offset.
`abstract int`	`previous()` Returns the boundary preceding the current boundary.
`abstract void`	`setText(CharacterIterator newText)` Set a new text for scanning.
`void`	`setText(String newText)` Set a new text string to be scanned.

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

- Field Detail
  - DONE
```
public static final int DONE
```
    DONE is returned by previous(), next(), next(int), preceding(int) and following(int) when either the first or last text boundary has been reached.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - BreakIterator
```
protected BreakIterator()
```
    Constructor. BreakIterator is stateless and has no default behavior.
- Method Detail
  - clone
```
public Object clone()
```
    Create a copy of this iterator
    
    Overrides:
    
    clone in class Object
    
    Returns:
    A copy of this
    See Also:
    Cloneable
  - first
```
public abstract int first()
```
    Returns the first boundary. The iterator's current position is set to the first text boundary.
    
    Returns:
    The character index of the first text boundary.
  - last
```
public abstract int last()
```
    Returns the last boundary. The iterator's current position is set to the last text boundary.
    
    Returns:
    The character index of the last text boundary.
  - next
```
public abstract int next(int n)
```
    Returns the nth boundary from the current boundary. If either the first or last text boundary has been reached, it returns BreakIterator.DONE and the current position is set to either the first or last text boundary depending on which one is reached. Otherwise, the iterator's current position is set to the new boundary. For example, if the iterator's current position is the mth text boundary and three more boundaries exist from the current boundary to the last text boundary, the next(2) call will return m + 2. The new text position is set to the (m + 2)th text boundary. A next(4) call would return BreakIterator.DONE and the last text boundary would become the new text position.
    
    Parameters:
    n - which boundary to return. A value of 0 does nothing. Negative values move to previous boundaries and positive values move to later boundaries.
    
    Returns:
    The character index of the nth boundary from the current position or BreakIterator.DONE if either first or last text boundary has been reached.
  - next
```
public abstract int next()
```
    Returns the boundary following the current boundary. If the current boundary is the last text boundary, it returns BreakIterator.DONE and the iterator's current position is unchanged. Otherwise, the iterator's current position is set to the boundary following the current boundary.
    
    Returns:
    The character index of the next text boundary or BreakIterator.DONE if the current boundary is the last text boundary. Equivalent to next(1).
    See Also:
    next(int)
  - previous
```
public abstract int previous()
```
    Returns the boundary preceding the current boundary. If the current boundary is the first text boundary, it returns BreakIterator.DONE and the iterator's current position is unchanged. Otherwise, the iterator's current position is set to the boundary preceding the current boundary.
    
    Returns:
    The character index of the previous text boundary or BreakIterator.DONE if the current boundary is the first text boundary.
  - following
```
public abstract int following(int offset)
```
    Returns the first boundary following the specified character offset. If the specified offset equals to the last text boundary, it returns BreakIterator.DONE and the iterator's current position is unchanged. Otherwise, the iterator's current position is set to the returned boundary. The value returned is always greater than the offset or the value BreakIterator.DONE.
    
    Parameters:
    offset - the character offset to begin scanning.
    
    Returns:
    The first boundary after the specified offset or BreakIterator.DONE if the last text boundary is passed in as the offset.
    
    Throws:
    
    IllegalArgumentException - if the specified offset is less than the first text boundary or greater than the last text boundary.
  - preceding
```
public int preceding(int offset)
```
    Returns the last boundary preceding the specified character offset. If the specified offset equals to the first text boundary, it returns BreakIterator.DONE and the iterator's current position is unchanged. Otherwise, the iterator's current position is set to the returned boundary. The value returned is always less than the offset or the value BreakIterator.DONE.
    
    Parameters:
    offset - the characater offset to begin scanning.
    
    Returns:
    The last boundary before the specified offset or BreakIterator.DONE if the first text boundary is passed in as the offset.
    
    Throws:
    
    IllegalArgumentException - if the specified offset is less than the first text boundary or greater than the last text boundary.
    Since:
    
    1.2
  - isBoundary
```
public boolean isBoundary(int offset)
```
    Returns true if the specified character offset is a text boundary.
    
    Parameters:
    offset - the character offset to check.
    
    Returns:
    true if "offset" is a boundary position, false otherwise.
    
    Throws:
    
    IllegalArgumentException - if the specified offset is less than the first text boundary or greater than the last text boundary.
    Since:
    
    1.2
  - current
```
public abstract int current()
```
    Returns character index of the text boundary that was most recently returned by next(), next(int), previous(), first(), last(), following(int) or preceding(int). If any of these methods returns BreakIterator.DONE because either first or last text boundary has been reached, it returns the first or last text boundary depending on which one is reached.
    
    Returns:
    The text boundary returned from the above methods, first or last text boundary.
    See Also:
    next(), next(int), previous(), first(), last(), following(int), preceding(int)
  - getText
```
public abstract CharacterIterator getText()
```
    Get the text being scanned
    
    Returns:
    the text being scanned
  - setText
```
public void setText(String newText)
```
    Set a new text string to be scanned. The current scan position is reset to first().
    
    Parameters:
    newText - new text to scan.
  - setText
```
public abstract void setText(CharacterIterator newText)
```
    Set a new text for scanning. The current scan position is reset to first().
    
    Parameters:
    newText - new text to scan.
  - getWordInstance
```
public static BreakIterator getWordInstance()
```
    Returns a new BreakIterator instance for word breaks for the default locale.
    
    Returns:
    A break iterator for word breaks
  - getWordInstance
```
public static BreakIterator getWordInstance(Locale locale)
```
    Returns a new BreakIterator instance for word breaks for the given locale.
    
    Parameters:
    locale - the desired locale
    
    Returns:
    A break iterator for word breaks
    
    Throws:
    
    NullPointerException - if locale is null
  - getLineInstance
```
public static BreakIterator getLineInstance()
```
    Returns a new BreakIterator instance for line breaks for the default locale.
    
    Returns:
    A break iterator for line breaks
  - getLineInstance
```
public static BreakIterator getLineInstance(Locale locale)
```
    Returns a new BreakIterator instance for line breaks for the given locale.
    
    Parameters:
    locale - the desired locale
    
    Returns:
    A break iterator for line breaks
    
    Throws:
    
    NullPointerException - if locale is null
  - getCharacterInstance
```
public static BreakIterator getCharacterInstance()
```
    Returns a new BreakIterator instance for character breaks for the default locale.
    
    Returns:
    A break iterator for character breaks
  - getCharacterInstance
```
public static BreakIterator getCharacterInstance(Locale locale)
```
    Returns a new BreakIterator instance for character breaks for the given locale.
    
    Parameters:
    locale - the desired locale
    
    Returns:
    A break iterator for character breaks
    
    Throws:
    
    NullPointerException - if locale is null
  - getSentenceInstance
```
public static BreakIterator getSentenceInstance()
```
    Returns a new BreakIterator instance for sentence breaks for the default locale.
    
    Returns:
    A break iterator for sentence breaks
  - getSentenceInstance
```
public static BreakIterator getSentenceInstance(Locale locale)
```
    Returns a new BreakIterator instance for sentence breaks for the given locale.
    
    Parameters:
    locale - the desired locale
    
    Returns:
    A break iterator for sentence breaks
    
    Throws:
    
    NullPointerException - if locale is null
  - getAvailableLocales
```
public static Locale[] getAvailableLocales()
```
    Returns an array of all locales for which the get*Instance methods of this class can return localized instances. The returned array represents the union of locales supported by the Java runtime and by installed BreakIteratorProvider implementations. It must contain at least a Locale instance equal to Locale.US.
    
    Returns:
    An array of locales for which localized BreakIterator instances are available.

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Класс BreakIterator

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DONE

Constructor Detail

BreakIterator

Method Detail

clone

first

last

next

next

previous

following

preceding

isBoundary

current

getText

setText

setText

getWordInstance

getWordInstance

getLineInstance

getLineInstance

getCharacterInstance

getCharacterInstance

getSentenceInstance

getSentenceInstance

getAvailableLocales