Package de.uni_mannheim.informatik.dws.melt.matching_jena_matchers.external.services.nlp

Class PorterStemmer

java.lang.Object
de.uni_mannheim.informatik.dws.melt.matching_jena_matchers.external.services.nlp.PorterStemmer
public class PorterStemmer extends Object
PorterStemmer, implementing the Porter Stemming Algorithm The PorterStemmer class transforms a word into its root form. The input word can be provided a character at time (by calling add()), or at once by calling one of the various stem(something) methods.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private char[]
    b
     
    private int
    i
     
    private int
    i_end
     
    private static final int
    INC
     
    private int
    j
     
    private int
    k
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    PorterStemmer()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    add(char ch)
    Add a character to the word being stemmed.
    void
    add(char[] w, int wLen)
    Adds wLen characters to the word being stemmed contained in a portion of a char[] array.
    private final boolean
    cons(int i)
     
    private final boolean
    cvc(int i)
     
    private final boolean
    doublec(int j)
     
    private final boolean
    ends(String s)
     
    char[]
    getResultBuffer()
    Returns a reference to a character buffer containing the results of the stemming process.
    int
    getResultLength()
    Returns the length of the word resulting from the stemming process.
    private final int
    m()
     
    private final void
    r(String s)
     
    private final void
    setto(String s)
     
    void
    stem()
    Stem the word placed into the PorterStemmer buffer through calls to add().
    private final void
    step1()
     
    private final void
    step2()
     
    private final void
    step3()
     
    private final void
    step4()
     
    private final void
    step5()
     
    private final void
    step6()
     
    String
    toString()
    After a word has been stemmed, it can be retrieved by toString(), or a reference to the internal buffer can be retrieved by getResultBuffer and getResultLength (which is generally more efficient.)
    private final boolean
    vowelinstem()
     

    Methods inherited from class java.lang.Object

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

  • Field Details

    • b

      private char[] b

    • i

      private int i

    • i_end

      private int i_end

    • j

      private int j

    • k

      private int k

    • INC

      private static final int INC
      See Also:

  • Constructor Details

    • PorterStemmer

      public PorterStemmer()

  • Method Details

    • add

      public void add(char ch)
      Add a character to the word being stemmed. When you are finished adding characters, you can call stem(void) to stem the word.
      Parameters:
      ch - Char.

    • add

      public void add(char[] w, int wLen)
      Adds wLen characters to the word being stemmed contained in a portion of a char[] array. This is like repeated calls of add(char ch), but faster.
      Parameters:
      w - w
      wLen - wLen

    • toString

      public String toString()
      After a word has been stemmed, it can be retrieved by toString(), or a reference to the internal buffer can be retrieved by getResultBuffer and getResultLength (which is generally more efficient.)
      Overrides:
      toString in class Object
      Returns:
      String

    • getResultLength

      public int getResultLength()
      Returns the length of the word resulting from the stemming process.
      Returns:
      int

    • getResultBuffer

      public char[] getResultBuffer()
      Returns a reference to a character buffer containing the results of the stemming process. You also need to consult getResultLength() to determine the length of the result.
      Returns:
      b (char[])

    • cons

      private final boolean cons(int i)

    • m

      private final int m()

    • vowelinstem

      private final boolean vowelinstem()

    • doublec

      private final boolean doublec(int j)

    • cvc

      private final boolean cvc(int i)

    • ends

      private final boolean ends(String s)

    • setto

      private final void setto(String s)

    • r

      private final void r(String s)

    • step1

      private final void step1()

    • step2

      private final void step2()

    • step3

      private final void step3()

    • step4

      private final void step4()

    • step5

      private final void step5()

    • step6

      private final void step6()

    • stem

      public void stem()
      Stem the word placed into the PorterStemmer buffer through calls to add(). Returns true if the stemming process resulted in a word different from the input. You can retrieve the result with getResultLength()/getResultBuffer() or toString().