Package org.apache.commons.codec.language

Class DoubleMetaphone

  • All Implemented Interfaces:
    Encoder, StringEncoder
    public class DoubleMetaphone
extends java.lang.Object
implements StringEncoder
    Encodes a string into a double metaphone value. This Implementation is based on the algorithm by Lawrence Philips.

    This class is conditionally thread-safe. The instance field for the maximum code length is mutable setMaxCodeLen(int) but is not volatile, and accesses are not synchronized. If an instance of the class is shared between threads, the caller needs to ensure that suitable synchronization is used to ensure safe publication of the value between threads, and must not invoke setMaxCodeLen(int) after initial setup.

    See Also:
    Original Article, http://en.wikipedia.org/wiki/Metaphone

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      class  DoubleMetaphone.DoubleMetaphoneResult
      Inner class for storing results, since there is the optional alternate encoding.

    • Constructor Summary

      Constructors 
      Constructor Description
      DoubleMetaphone()
      Creates an instance of this DoubleMetaphone encoder

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected char charAt​(java.lang.String value, int index)  
      protected static boolean contains​(java.lang.String value, int start, int length, java.lang.String... criteria)  
      java.lang.String doubleMetaphone​(java.lang.String value)
      Encode a value with Double Metaphone.
      java.lang.String doubleMetaphone​(java.lang.String value, boolean alternate)
      Encode a value with Double Metaphone, optionally using the alternate encoding.
      java.lang.Object encode​(java.lang.Object obj)
      Encode the value using DoubleMetaphone.
      java.lang.String encode​(java.lang.String value)
      Encode the value using DoubleMetaphone.
      int getMaxCodeLen()
      Returns the maxCodeLen.
      boolean isDoubleMetaphoneEqual​(java.lang.String value1, java.lang.String value2)
      Check if the Double Metaphone values of two String values are equal.
      boolean isDoubleMetaphoneEqual​(java.lang.String value1, java.lang.String value2, boolean alternate)
      Check if the Double Metaphone values of two String values are equal, optionally using the alternate value.
      void setMaxCodeLen​(int maxCodeLen)
      Sets the maxCodeLen.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • DoubleMetaphone

        public DoubleMetaphone()
        Creates an instance of this DoubleMetaphone encoder

    • Method Detail

      • doubleMetaphone

        public java.lang.String doubleMetaphone​(java.lang.String value)
        Encode a value with Double Metaphone.
        Parameters:
        value - String to encode
        Returns:
        an encoded string

      • doubleMetaphone

        public java.lang.String doubleMetaphone​(java.lang.String value,
                                        boolean alternate)
        Encode a value with Double Metaphone, optionally using the alternate encoding.
        Parameters:
        value - String to encode
        alternate - use alternate encode
        Returns:
        an encoded string

      • encode

        public java.lang.Object encode​(java.lang.Object obj)
                        throws EncoderException
        Encode the value using DoubleMetaphone. It will only work if obj is a String (like Metaphone).
        Specified by:
        encode in interface Encoder
        Parameters:
        obj - Object to encode (should be of type String)
        Returns:
        An encoded Object (will be of type String)
        Throws:
        EncoderException - encode parameter is not of type String

      • encode

        public java.lang.String encode​(java.lang.String value)
        Encode the value using DoubleMetaphone.
        Specified by:
        encode in interface StringEncoder
        Parameters:
        value - String to encode
        Returns:
        An encoded String

      • isDoubleMetaphoneEqual

        public boolean isDoubleMetaphoneEqual​(java.lang.String value1,
                                      java.lang.String value2)
        Check if the Double Metaphone values of two String values are equal.
        Parameters:
        value1 - The left-hand side of the encoded String.equals(Object).
        value2 - The right-hand side of the encoded String.equals(Object).
        Returns:
        true if the encoded Strings are equal; false otherwise.
        See Also:
        isDoubleMetaphoneEqual(String,String,boolean)

      • isDoubleMetaphoneEqual

        public boolean isDoubleMetaphoneEqual​(java.lang.String value1,
                                      java.lang.String value2,
                                      boolean alternate)
        Check if the Double Metaphone values of two String values are equal, optionally using the alternate value.
        Parameters:
        value1 - The left-hand side of the encoded String.equals(Object).
        value2 - The right-hand side of the encoded String.equals(Object).
        alternate - use the alternate value if true.
        Returns:
        true if the encoded Strings are equal; false otherwise.

      • getMaxCodeLen

        public int getMaxCodeLen()
        Returns the maxCodeLen.
        Returns:
        int

      • setMaxCodeLen

        public void setMaxCodeLen​(int maxCodeLen)
        Sets the maxCodeLen.
        Parameters:
        maxCodeLen - The maxCodeLen to set

      • charAt

        protected char charAt​(java.lang.String value,
                      int index)

      • contains

        protected static boolean contains​(java.lang.String value,
                                  int start,
                                  int length,
                                  java.lang.String... criteria)