org.basex.util.ft

Class Stemmer

java.lang.Object

org.basex.util.ft.FTIterator

org.basex.util.ft.Stemmer

All Implemented Interfaces:

java.lang.Comparable<org.basex.util.ft.LanguageImpl>, java.util.Iterator<FTSpan>

Direct Known Subclasses:

InternalStemmer

public abstract class Stemmer
extends FTIterator

Implementation of common stemmer methods.

Author:

BaseX Team 2005-12, BSD License, Dimitar Popov

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(org.basex.util.ft.LanguageImpl o)
boolean	equals(java.lang.Object o)
int	hashCode()
boolean	hasNext()
Stemmer	init(byte[] txt) Initializes the iterator.
FTSpan	next()
byte[]	nextToken() Returns the next token.
protected abstract byte	prec() Returns the precedence of the processor.
protected abstract byte[]	stem(byte[] word) Stems a word.
static boolean	supportFor(Language l) Checks if the language is supported by the available stemmers.
boolean	supports(Language ln) Checks if the specified language is supported.
java.lang.String	toString()

Methods inherited from class org.basex.util.ft.FTIterator

remove

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

supportFor

public static boolean supportFor(Language l)

Checks if the language is supported by the available stemmers.

Parameters:

l - language to be found

Returns:

result of check

stem

protected abstract byte[] stem(byte[] word)

Stems a word.

Parameters:

word - input word to stem

Returns:

the stem of the word

init

public final Stemmer init(byte[] txt)

Description copied from class: FTIterator

Initializes the iterator.

Specified by:

init in class FTIterator

Parameters:

txt - text

Returns:

self reference

hasNext

public final boolean hasNext()

next

public final FTSpan next()

nextToken

public final byte[] nextToken()

Description copied from class: FTIterator

Returns the next token. May be called as an alternative to Iterator.next() to avoid the creation of new FTSpan instances.

Specified by:

nextToken in class FTIterator

Returns:

token

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

prec

protected abstract byte prec()

Returns the precedence of the processor. If two language implementations support the same language, the processor with the higher precedence will be selected.

Returns:

precedence

supports

public boolean supports(Language ln)

Checks if the specified language is supported.

Parameters:

ln - language

Returns:

true if language is supported

equals

public final boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

compareTo

public final int compareTo(org.basex.util.ft.LanguageImpl o)

Specified by:

compareTo in interface java.lang.Comparable<org.basex.util.ft.LanguageImpl>

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object