tc
Class TCLancasterStemmer

java.lang.Object
  tc.TCLancasterStemmer

public class TCLancasterStemmer

extends java.lang.Object

Class: Paice * * Purpose: Stemming Algorithm *

Field Summary

private java.lang.String	filerules
private boolean	preStrip
private int[]	ruleIndex
private java.util.Vector	ruleTable

Constructor Summary

TCLancasterStemmer(java.lang.String rules, java.lang.String pre)
Method: Paice * * Purpose: init *

Method Summary

private int	charCode(char ch) Method: charCode * Returns: int * Recievs: char ch * Purpose: returns the relavent array index for * specified char 'a' to 'z' *
private java.lang.String	Clean(java.lang.String str) Method: Clean * Returns: String * Recievs: String str * Purpose: remove all non letter or digit * characters from srt and return *
private int	FirstVowel(java.lang.String word, int last) Method: FirstVowel * Returns: int * Recievs: String word, int last * Purpose: checks lower-case word for position of * the first vowel *
private void	ReadRules(java.lang.String stemRules) Method: ReadRules * Returns: void * Receives: * Purpose: read rules in from stemRules and enters them * into ruleTable, ruleIndex is set up to provide * faster access to relevant rules.
java.lang.String	stripAffixes(java.lang.String str) Method: stripAffixes * Returns: String * Recievs: String str * Purpose: prepares string and calls stripPrefixes * and stripSuffixes *
private java.lang.String	stripPrefixes(java.lang.String str) Method: stripPrefixes * Returns: String * Recievs: String str * Purpose: removes prefixes so that suffix * removal can comence *
private java.lang.String	stripSuffixes(java.lang.String word) Method: stripSuffixes * Returns: String * Recievs: String word * Purpose: strips suffix off word and returns stem using * paice stemming algorithm *
private boolean	vowel(char ch, char prev) Method: vowel * Returns: boolean * Recievs: char ch, char prev * Purpose: determin whether ch is a vowel or not * uses prev determination when ch == y *

Methods inherited from class java.lang.Object

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

Field Detail

ruleTable

private java.util.Vector ruleTable

ruleIndex

private int[] ruleIndex

preStrip

private boolean preStrip

filerules

private java.lang.String filerules

Constructor Detail

TCLancasterStemmer

public TCLancasterStemmer(java.lang.String rules,
                          java.lang.String pre)

Method: Paice * * Purpose: init *

Method Detail

ReadRules

private void ReadRules(java.lang.String stemRules)

Method: ReadRules * Returns: void * Receives: * Purpose: read rules in from stemRules and enters them * into ruleTable, ruleIndex is set up to provide * faster access to relevant rules. *

FirstVowel

private int FirstVowel(java.lang.String word,
                       int last)

Method: FirstVowel * Returns: int * Recievs: String word, int last * Purpose: checks lower-case word for position of * the first vowel *

stripSuffixes

private java.lang.String stripSuffixes(java.lang.String word)

Method: stripSuffixes * Returns: String * Recievs: String word * Purpose: strips suffix off word and returns stem using * paice stemming algorithm *

vowel

private boolean vowel(char ch,
                      char prev)

Method: vowel * Returns: boolean * Recievs: char ch, char prev * Purpose: determin whether ch is a vowel or not * uses prev determination when ch == y *

charCode

private int charCode(char ch)

Method: charCode * Returns: int * Recievs: char ch * Purpose: returns the relavent array index for * specified char 'a' to 'z' *

stripPrefixes

private java.lang.String stripPrefixes(java.lang.String str)

Method: stripPrefixes * Returns: String * Recievs: String str * Purpose: removes prefixes so that suffix * removal can comence *

Clean

private java.lang.String Clean(java.lang.String str)

Method: Clean * Returns: String * Recievs: String str * Purpose: remove all non letter or digit * characters from srt and return *

stripAffixes

public java.lang.String stripAffixes(java.lang.String str)

Method: stripAffixes * Returns: String * Recievs: String str * Purpose: prepares string and calls stripPrefixes * and stripSuffixes *