org.apache.lucene.analysis.miscellaneous

## Class CapitalizationFilter

- java.lang.Object
- - org.apache.lucene.util.AttributeSource
  - - org.apache.lucene.analysis.TokenStream
    - - org.apache.lucene.analysis.TokenFilter
      - - org.apache.lucene.analysis.miscellaneous.CapitalizationFilter

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public final class CapitalizationFilter
      extends TokenFilter

  A filter to apply normal capitalization rules to Tokens. It will make the first letter capital and the rest lower case.

  This filter is particularly useful to build nice looking facet parameters. This filter is not appropriate if you intend to use a prefix query.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

      `AttributeSource.AttributeFactory, AttributeSource.State`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `DEFAULT_MAX_TOKEN_LENGTH`
    `static int` | `DEFAULT_MAX_WORD_COUNT`

    - ### Fields inherited from class org.apache.lucene.analysis.TokenFilter

      `input`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `CapitalizationFilter(TokenStream in)` Creates a CapitalizationFilter with the default parameters.
    `CapitalizationFilter(TokenStream in, boolean onlyFirstWord, CharArraySet keep, boolean forceFirstLetter, Collection<char[]> okPrefix, int minWordLength, int maxWordCount, int maxTokenLength)` Creates a CapitalizationFilter with the specified parameters.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `incrementToken()`

    - ### Methods inherited from class org.apache.lucene.analysis.TokenFilter

      `close, end, reset`

    - ### Methods inherited from class org.apache.lucene.util.AttributeSource

      `addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState`

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

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

- - ### Field Detail

    - #### DEFAULT_MAX_WORD_COUNT

          public static final int DEFAULT_MAX_WORD_COUNT

      See Also:
        Constant Field Values

    - #### DEFAULT_MAX_TOKEN_LENGTH

          public static final int DEFAULT_MAX_TOKEN_LENGTH

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### CapitalizationFilter

          public CapitalizationFilter(TokenStream in)

      Creates a CapitalizationFilter with the default parameters.

      Calls `CapitalizationFilter(in, true, null, true, null, 0, DEFAULT_MAX_WORD_COUNT, DEFAULT_MAX_TOKEN_LENGTH)`

    - #### CapitalizationFilter

          public CapitalizationFilter(TokenStream in,
                              boolean onlyFirstWord,
                              CharArraySet keep,
                              boolean forceFirstLetter,
                              Collection<char[]> okPrefix,
                              int minWordLength,
                              int maxWordCount,
                              int maxTokenLength)

      Creates a CapitalizationFilter with the specified parameters.
      Parameters:
        `in` - input tokenstream
        `onlyFirstWord` - should each word be capitalized or all of the words?
        `keep` - a keep word list. Each word that should be kept separated by whitespace.
        `forceFirstLetter` - Force the first letter to be capitalized even if it is in the keep list.
        `okPrefix` - do not change word capitalization if a word begins with something in this list.
        `minWordLength` - how long the word needs to be to get capitalization applied. If the minWordLength is 3, "and" > "And" but "or" stays "or".
        `maxWordCount` - if the token contains more then maxWordCount words, the capitalization is assumed to be correct.
        `maxTokenLength` - ???

  - ### Method Detail

    - #### incrementToken

          public boolean incrementToken()
                                 throws IOException

      Specified by:
        `incrementToken` in class `TokenStream`
      Throws:
        `IOException`

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