Package org.ujmp.core.util
Class PorterStemmer
- java.lang.Object
-
- org.ujmp.core.util.PorterStemmer
-
public class PorterStemmer extends java.lang.Object
Stemmer, implementing the Porter Stemming Algorithm The Stemmer 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.
-
-
Constructor Summary
Constructors Constructor Description PorterStemmer()
-
Method Summary
All Methods Static Methods Instance Methods Concrete Methods 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 boolean
cons(int i)
private boolean
cvc(int i)
private boolean
doublec(int j)
private boolean
ends(java.lang.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 int
m()
static void
main(java.lang.String[] args)
Test program for demonstrating the Stemmer.private void
r(java.lang.String s)
private void
setto(java.lang.String s)
void
stem()
Stem the word placed into the Stemmer buffer through calls to add().java.lang.String
stem(java.lang.String s)
Stem a word provided as a String.private void
step1()
private void
step2()
private void
step3()
private void
step4()
private void
step5()
private void
step6()
java.lang.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 boolean
vowelinstem()
-
-
-
Field Detail
-
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:
- Constant Field Values
-
-
Method Detail
-
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.
-
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.
-
toString
public java.lang.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 classjava.lang.Object
-
getResultLength
public int getResultLength()
Returns the length of the word resulting from the stemming process.
-
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.
-
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(java.lang.String s)
-
setto
private final void setto(java.lang.String s)
-
r
private final void r(java.lang.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 java.lang.String stem(java.lang.String s)
Stem a word provided as a String. Returns the result as a String.
-
stem
public void stem()
Stem the word placed into the Stemmer 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().
-
main
public static void main(java.lang.String[] args)
Test program for demonstrating the Stemmer. It reads text from a a list of files, stems each word, and writes the result to standard output. Note that the word stemmed is expected to be in lower case: forcing lower case must be done outside the Stemmer class. Usage: Stemmer file-name file-name ...
-
-