Package org.apache.commons.codec.language

# Class DaitchMokotoffSoundex

java.lang.Object
org.apache.commons.codec.language.DaitchMokotoffSoundex

All Implemented Interfaces:
  `Encoder`, `StringEncoder`

public class DaitchMokotoffSoundex extends Object implements StringEncoder
Encodes a string into a Daitch-Mokotoff Soundex value.

The Daitch-Mokotoff Soundex algorithm is a refinement of the Russel and American Soundex algorithms, yielding greater accuracy in matching especially Slavish and Yiddish surnames with similar pronunciation but differences in spelling.

The main differences compared to the other soundex variants are:

- coded names are 6 digits long
- the initial character of the name is coded
- rules to encoded multi-character n-grams
- multiple possible encodings for the same name (branching)

This implementation supports branching, depending on the used method:

- `encode(String)` - branching disabled, only the first code will be returned
- `soundex(String)` - branching enabled, all codes will be returned, separated by '|'

Note: This implementation has additional branching rules compared to the original description of the algorithm. The rules can be customized by overriding the default rules contained in the resource file `org/apache/commons/codec/language/dmrules.txt`.

This class is thread-safe.

Since:
  1.10
See Also:
  - `Soundex`
  - Wikipedia - Daitch-Mokotoff Soundex
  - Avotaynu - Soundexing and Genealogy

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `DaitchMokotoffSoundex()`
  Creates a new instance with ASCII-folding enabled.
  `DaitchMokotoffSoundex(boolean folding)`
  Creates a new instance.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Object`
  `encode(Object obj)`
  Encodes an Object using the Daitch-Mokotoff soundex algorithm without branching.
  `String`
  `encode(String source)`
  Encodes a String using the Daitch-Mokotoff soundex algorithm without branching.
  `String`
  `soundex(String source)`
  Encodes a String using the Daitch-Mokotoff soundex algorithm with branching.

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

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

- ## Constructor Details

  - ### DaitchMokotoffSoundex

    public DaitchMokotoffSoundex()
    Creates a new instance with ASCII-folding enabled.

  - ### DaitchMokotoffSoundex

    public DaitchMokotoffSoundex(boolean folding)
    Creates a new instance.

    With ASCII-folding enabled, certain accented characters will be transformed to equivalent ASCII characters, e.g. è -> e.

    Parameters:
      `folding` - if ASCII-folding shall be performed before encoding

- ## Method Details

  - ### encode

    public Object encode(Object obj) throws EncoderException
    Encodes an Object using the Daitch-Mokotoff soundex algorithm without branching.

    This method is provided in order to satisfy the requirements of the Encoder interface, and will throw an EncoderException if the supplied object is not of type `String`.

    Specified by:
      `encode` in interface `Encoder`
    Parameters:
      `obj` - Object to encode
    Returns:
      An object (of type `String`) containing the DM soundex code, which corresponds to the String supplied.
    Throws:
      `EncoderException` - if the parameter supplied is not of type `String`
      `IllegalArgumentException` - if a character is not mapped
    See Also:
      - `soundex(String)`

  - ### encode

    public String encode(String source)
    Encodes a String using the Daitch-Mokotoff soundex algorithm without branching.
    Specified by:
      `encode` in interface `StringEncoder`
    Parameters:
      `source` - A String object to encode
    Returns:
      A DM Soundex code corresponding to the String supplied
    Throws:
      `IllegalArgumentException` - if a character is not mapped
    See Also:
      - `soundex(String)`

  - ### soundex

    public String soundex(String source)
    Encodes a String using the Daitch-Mokotoff soundex algorithm with branching.

    In case a string is encoded into multiple codes (see branching rules), the result will contain all codes, separated by '|'.

    Example: the name "AUERBACH" is encoded as both

    - 097400
    - 097500

    Thus the result will be "097400|097500".

    Parameters:
      `source` - A String object to encode
    Returns:
      A string containing a set of DM Soundex codes corresponding to the String supplied
    Throws:
      `IllegalArgumentException` - if a character is not mapped