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 "?" 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 and Description
    --- | ---
    `static boolean` | `NORMALIZE_KANA_DEFAULT` Normalize kana iteration marks by default
    `static 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 and Description
    `JapaneseIterationMarkCharFilter(Reader input)` Constructor.
    `JapaneseIterationMarkCharFilter(Reader input, boolean normalizeKanji, boolean normalizeKana)` Constructor

  - ### Method Summary

    Methods
    Modifier and Type | Method and 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, read, read, ready, reset, skip`

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

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

- - ### Field Detail

    - #### 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 Detail

    - #### 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 Detail

    - #### 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`

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