org.apache.lucene.analysis

## Class WordlistLoader

- java.lang.Object
- - org.apache.lucene.analysis.WordlistLoader

-     public class WordlistLoader
      extends Object

  Loader for text files that represent a list of stopwords.
  See Also:
    `to obtain {@link Reader} instances`
  NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

- - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static List<String>` | `getLines(InputStream stream, Charset charset)` Accesses a resource by name and returns the (non comment) lines containing data using the given character encoding.
    `static CharArraySet` | `getSnowballWordSet(Reader reader)` Reads stopwords from a stopword list in Snowball format.
    `static CharArraySet` | `getSnowballWordSet(Reader reader, CharArraySet result)` Reads stopwords from a stopword list in Snowball format.
    `static CharArrayMap<String>` | `getStemDict(Reader reader, CharArrayMap<String> result)` Reads a stem dictionary.
    `static CharArraySet` | `getWordSet(Reader reader)` Reads lines from a Reader and adds every line as an entry to a CharArraySet (omitting leading and trailing whitespace).
    `static CharArraySet` | `getWordSet(Reader reader, CharArraySet result)` Reads lines from a Reader and adds every line as an entry to a CharArraySet (omitting leading and trailing whitespace).
    `static CharArraySet` | `getWordSet(Reader reader, String comment)` Reads lines from a Reader and adds every non-comment line as an entry to a CharArraySet (omitting leading and trailing whitespace).
    `static CharArraySet` | `getWordSet(Reader reader, String comment, CharArraySet result)` Reads lines from a Reader and adds every non-comment line as an entry to a CharArraySet (omitting leading and trailing whitespace).

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

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

- - ### Method Detail

    - #### getWordSet

          public static CharArraySet getWordSet(Reader reader,
                                                CharArraySet result)
                                         throws IOException

      Reads lines from a Reader and adds every line as an entry to a CharArraySet (omitting leading and trailing whitespace). Every line of the Reader should contain only one word. The words need to be in lowercase if you make use of an Analyzer which uses LowerCaseFilter (like StandardAnalyzer).
      Parameters:
        `reader` - Reader containing the wordlist
        `result` - the `CharArraySet` to fill with the readers words
      Returns:
        the given `CharArraySet` with the reader's words
      Throws:
        `IOException`

    - #### getWordSet

          public static CharArraySet getWordSet(Reader reader)
                                         throws IOException

      Reads lines from a Reader and adds every line as an entry to a CharArraySet (omitting leading and trailing whitespace). Every line of the Reader should contain only one word. The words need to be in lowercase if you make use of an Analyzer which uses LowerCaseFilter (like StandardAnalyzer).
      Parameters:
        `reader` - Reader containing the wordlist
      Returns:
        A `CharArraySet` with the reader's words
      Throws:
        `IOException`

    - #### getWordSet

          public static CharArraySet getWordSet(Reader reader,
                                                String comment)
                                         throws IOException

      Reads lines from a Reader and adds every non-comment line as an entry to a CharArraySet (omitting leading and trailing whitespace). Every line of the Reader should contain only one word. The words need to be in lowercase if you make use of an Analyzer which uses LowerCaseFilter (like StandardAnalyzer).
      Parameters:
        `reader` - Reader containing the wordlist
        `comment` - The string representing a comment.
      Returns:
        A CharArraySet with the reader's words
      Throws:
        `IOException`

    - #### getWordSet

          public static CharArraySet getWordSet(Reader reader,
                                                String comment,
                                                CharArraySet result)
                                         throws IOException

      Reads lines from a Reader and adds every non-comment line as an entry to a CharArraySet (omitting leading and trailing whitespace). Every line of the Reader should contain only one word. The words need to be in lowercase if you make use of an Analyzer which uses LowerCaseFilter (like StandardAnalyzer).
      Parameters:
        `reader` - Reader containing the wordlist
        `comment` - The string representing a comment.
        `result` - the `CharArraySet` to fill with the readers words
      Returns:
        the given `CharArraySet` with the reader's words
      Throws:
        `IOException`

    - #### getSnowballWordSet

          public static CharArraySet getSnowballWordSet(Reader reader,
                                                        CharArraySet result)
                                                 throws IOException

      Reads stopwords from a stopword list in Snowball format.

      The snowball format is the following:

      - Lines may contain multiple words separated by whitespace.
      - The comment character is the vertical line (|).
      - Lines may contain trailing comments.
      Parameters:
        `reader` - Reader containing a Snowball stopword list
        `result` - the `CharArraySet` to fill with the readers words
      Returns:
        the given `CharArraySet` with the reader's words
      Throws:
        `IOException`

    - #### getSnowballWordSet

          public static CharArraySet getSnowballWordSet(Reader reader)
                                                 throws IOException

      Reads stopwords from a stopword list in Snowball format.

      The snowball format is the following:

      - Lines may contain multiple words separated by whitespace.
      - The comment character is the vertical line (|).
      - Lines may contain trailing comments.
      Parameters:
        `reader` - Reader containing a Snowball stopword list
      Returns:
        A `CharArraySet` with the reader's words
      Throws:
        `IOException`

    - #### getStemDict

          public static CharArrayMap<String> getStemDict(Reader reader,
                                                         CharArrayMap<String> result)
                                                  throws IOException

      Reads a stem dictionary. Each line contains:

          word\tstem

      (i.e. two tab separated words)
      Returns:
        stem dictionary that overrules the stemming algorithm
      Throws:
        `IOException` - If there is a low-level I/O error.

    - #### getLines

          public static List<String> getLines(InputStream stream,
                                              Charset charset)
                                       throws IOException

      Accesses a resource by name and returns the (non comment) lines containing data using the given character encoding.

      A comment line is any line that starts with the character "#"

      Returns:
        a list of non-blank non-comment lines with whitespace trimmed
      Throws:
        `IOException` - If there is a low-level I/O error.

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