org.apache.lucene.search.suggest

## Class FileDictionary

- java.lang.Object
- - org.apache.lucene.search.suggest.FileDictionary

- All Implemented Interfaces:
    Dictionary

      public class FileDictionary
      extends Object
      implements Dictionary

  Dictionary represented by a text file.

  Format allowed: 1 entry per line:
  An entry can be:

  - suggestion
  - suggestion `fieldDelimiter` weight
  - suggestion `fieldDelimiter` weight `fieldDelimiter` payload
  where the default `fieldDelimiter` is "\t"

  NOTE:

  - In order to have payload enabled, the first entry has to have a payload
  - If the weight for an entry is not specified then a value of 1 is used
  - A payload cannot be specified without having the weight specified for an entry
  - If the payload for an entry is not specified (assuming payload is enabled) then an empty payload is returned
  - An entry cannot have more than two `fieldDelimiter`

  Example:
  word1 word2 TAB 100 TAB payload1
  word3 TAB 101
  word4 word3 TAB 102

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `DEFAULT_FIELD_DELIMITER` Tab-delimited fields are most common thus the default, but one can override this via the constructor

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FileDictionary(InputStream dictFile)` Creates a dictionary based on an inputstream.
    `FileDictionary(InputStream dictFile, String fieldDelimiter)` Creates a dictionary based on an inputstream.
    `FileDictionary(Reader reader)` Creates a dictionary based on a reader.
    `FileDictionary(Reader reader, String fieldDelimiter)` Creates a dictionary based on a reader.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `InputIterator` | `getEntryIterator()` Returns an iterator over all the entries

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

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

- - ### Field Detail

    - #### DEFAULT_FIELD_DELIMITER

          public static final String DEFAULT_FIELD_DELIMITER

      Tab-delimited fields are most common thus the default, but one can override this via the constructor
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### FileDictionary

          public FileDictionary(InputStream dictFile)

      Creates a dictionary based on an inputstream. Using `DEFAULT_FIELD_DELIMITER` as the field separator in a line.

      NOTE: content is treated as UTF-8

    - #### FileDictionary

          public FileDictionary(Reader reader)

      Creates a dictionary based on a reader. Using `DEFAULT_FIELD_DELIMITER` as the field separator in a line.

    - #### FileDictionary

          public FileDictionary(Reader reader,
                                String fieldDelimiter)

      Creates a dictionary based on a reader. Using `fieldDelimiter` to separate out the fields in a line.

    - #### FileDictionary

          public FileDictionary(InputStream dictFile,
                                String fieldDelimiter)

      Creates a dictionary based on an inputstream. Using `fieldDelimiter` to separate out the fields in a line.

      NOTE: content is treated as UTF-8

  - ### Method Detail

    - #### getEntryIterator

          public InputIterator getEntryIterator()

      Description copied from interface: `Dictionary`
      Returns an iterator over all the entries
      Specified by:
        `getEntryIterator` in interface `Dictionary`
      Returns:
        Iterator

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