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org.apache.commons.codec.language

Class 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 Detail

      • 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 Detail

      • 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 java.lang.String.

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

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