Package org.apache.lucene.analysis.ja

# Class JapaneseIterationMarkCharFilter

java.lang.Object
java.io.Reader
org.apache.lucene.analysis.CharFilter
org.apache.lucene.analysis.ja.JapaneseIterationMarkCharFilter

All Implemented Interfaces:
  `Closeable`, `AutoCloseable`, `Readable`

public class JapaneseIterationMarkCharFilter extends CharFilter
Normalizes Japanese horizontal iteration marks (odoriji) to their expanded form.

Sequences of iteration marks are supported. In case an illegal sequence of iteration marks is encountered, the implementation emits the illegal source character as-is without considering its script. For example, with input "?ゝ", we get "??" even though the question mark isn't hiragana.

Note that a full stop punctuation character "。" (U+3002) can not be iterated (see below). Iteration marks themselves can be emitted in case they are illegal, i.e. if they go back past the beginning of the character stream.

The implementation buffers input until a full stop punctuation character (U+3002) or EOF is reached in order to not keep a copy of the character stream in memory. Vertical iteration marks, which are even rarer than horizontal iteration marks in contemporary Japanese, are unsupported.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final boolean`
  `NORMALIZE_KANA_DEFAULT`
  Normalize kana iteration marks by default
  `static final boolean`
  `NORMALIZE_KANJI_DEFAULT`
  Normalize kanji iteration marks by default

  ### Fields inherited from class org.apache.lucene.analysis.CharFilter

  `input`

  ### Fields inherited from class java.io.Reader

  `lock`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `JapaneseIterationMarkCharFilter(Reader input)`
  Constructor.
  `JapaneseIterationMarkCharFilter(Reader input, boolean normalizeKanji, boolean normalizeKana)`
  Constructor

- ## Method Summary

  Modifier and Type
  Method
  Description
  `protected int`
  `correct(int currentOff)`
  `int`
  `read()`
  `int`
  `read(char[] buffer, int offset, int length)`

  ### Methods inherited from class org.apache.lucene.analysis.CharFilter

  `close, correctOffset`

  ### Methods inherited from class java.io.Reader

  `mark, markSupported, nullReader, read, read, ready, reset, skip, transferTo`

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### NORMALIZE_KANJI_DEFAULT

    public static final boolean NORMALIZE_KANJI_DEFAULT
    Normalize kanji iteration marks by default
    See Also:
      - Constant Field Values

  - ### NORMALIZE_KANA_DEFAULT

    public static final boolean NORMALIZE_KANA_DEFAULT
    Normalize kana iteration marks by default
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### JapaneseIterationMarkCharFilter

    public JapaneseIterationMarkCharFilter(Reader input)
    Constructor. Normalizes both kanji and kana iteration marks by default.
    Parameters:
      `input` - char stream

  - ### JapaneseIterationMarkCharFilter

    public JapaneseIterationMarkCharFilter(Reader input, boolean normalizeKanji, boolean normalizeKana)
    Constructor
    Parameters:
      `input` - char stream
      `normalizeKanji` - indicates whether kanji iteration marks should be normalized
      `normalizeKana` - indicates whether kana iteration marks should be normalized

- ## Method Details

  - ### read

    public int read(char[] buffer, int offset, int length) throws IOException
    Specified by:
      `read` in class `Reader`
    Throws:
      `IOException`

  - ### read

    public int read() throws IOException
    Overrides:
      `read` in class `Reader`
    Throws:
      `IOException`

  - ### correct

    protected int correct(int currentOff)
    Specified by:
      `correct` in class `CharFilter`