org.apache.lucene.analysis.hunspell
Class HunspellStemmer

java.lang.Object
  org.apache.lucene.analysis.hunspell.HunspellStemmer

public class HunspellStemmer
extends Object

HunspellStemmer uses the affix rules declared in the HunspellDictionary to generate one or more stems for a word. It conforms to the algorithm in the original hunspell algorithm, including recursive suffix stripping.

Nested Class Summary

static class

HunspellStemmer.Stem Stem represents all information known about a stem of a word.

Constructor Summary

HunspellStemmer(HunspellDictionary dictionary)
Constructs a new HunspellStemmer which will use the provided HunspellDictionary to create its stems.

HunspellStemmer(HunspellDictionary dictionary, int recursionCap)
Constructs a new HunspellStemmer which will use the provided HunspellDictionary to create its stems

Method Summary

List<HunspellStemmer.Stem>	applyAffix(char[] strippedWord, int length, HunspellAffix affix, int recursionDepth) Applies the affix rule to the given word, producing a list of stems if any are found
List<HunspellStemmer.Stem>	stem(char[] word, int length) Find the stem(s) of the provided word
List<HunspellStemmer.Stem>	stem(String word) Find the stem(s) of the provided word
List<HunspellStemmer.Stem>	uniqueStems(char[] word, int length) Find the unique stem(s) of the provided word

Methods inherited from class java.lang.Object

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

Constructor Detail

HunspellStemmer

public HunspellStemmer(HunspellDictionary dictionary)

Constructs a new HunspellStemmer which will use the provided HunspellDictionary to create its stems. Uses the default recursion cap of 2 (based on Hunspell documentation).

Parameters:

dictionary - HunspellDictionary that will be used to create the stems

HunspellStemmer

public HunspellStemmer(HunspellDictionary dictionary,
                       int recursionCap)

Constructs a new HunspellStemmer which will use the provided HunspellDictionary to create its stems

Parameters:

dictionary - HunspellDictionary that will be used to create the stems

recursionCap - maximum level of recursion stemmer can go into

Method Detail

stem

public List<HunspellStemmer.Stem> stem(String word)

Find the stem(s) of the provided word

Parameters:

word - Word to find the stems for

Returns:

List of stems for the word

stem

public List<HunspellStemmer.Stem> stem(char[] word,
                                       int length)

Find the stem(s) of the provided word

Parameters:

word - Word to find the stems for

Returns:

List of stems for the word

uniqueStems

public List<HunspellStemmer.Stem> uniqueStems(char[] word,
                                              int length)

Find the unique stem(s) of the provided word

Parameters:

word - Word to find the stems for

Returns:

List of stems for the word

applyAffix

public List<HunspellStemmer.Stem> applyAffix(char[] strippedWord,
                                             int length,
                                             HunspellAffix affix,
                                             int recursionDepth)

Applies the affix rule to the given word, producing a list of stems if any are found

Parameters:

strippedWord - Word the affix has been removed and the strip added

affix - HunspellAffix representing the affix rule itself

recursionDepth - Level of recursion this stemming step is at

Returns:

List of stems for the word, or an empty list if none are found