rita.support
Class PlingStemmer

java.lang.Object
  rita.support.PlingStemmer

All Implemented Interfaces:

RiStemmerIF

public class PlingStemmer
extends java.lang.Object
implements RiStemmerIF

This class is closely based on the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools). It is licensed under the Creative Commons Attribution License (see http://creativecommons.org/licenses/by/3.0). Stems an English noun (plural or singular) to its singular form, including irregular forms, e.g., "firemen"->"fireman" and "appendices"->"appendix" There are a number of word forms that can either be plural or singular. Examples include "physics" (the science or the plural of "physic" (the medicine)), "quarters" (the housing or the plural of "quarter" (1/4)) or "people" (the singular of "peoples" or the plural of "person"). In these cases, the stemmer assumes the word is a plural form and returns the singular form. The methods isPlural, isSingular and isPluralAndSingular can be used to differentiate the cases.

The PlingStemmer uses material from WordNet.

Field Summary

static java.util.Set<java.lang.String>	category00 Words that do not have a distinct plural form (like "atlas" etc.)
static java.util.Set<java.lang.String>	categoryCHE_CHES Words that change from "-che" to "-ches" (like "brioche" etc.), listed in their plural forms
static java.util.Set<java.lang.String>	categoryEX_ICES Words that change from "-ex" to "-ices" (like "index" etc.), listed in their plural forms
static java.util.Set<java.lang.String>	categoryICS Words that end with "-ics" and do not exist as nouns without the 's' (like "aerobics" etc.)
static java.util.Set<java.lang.String>	categoryIE_IES Words that change from "-ie" to "-ies" (like "auntie" etc.), listed in their plural forms
static java.util.Set<java.lang.String>	categoryIS_ES Words that change from "-is" to "-es" (like "axis" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).
static java.util.Set<java.lang.String>	categoryIX_ICES Words that change from "-ix" to "-ices" (like "appendix" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).
static java.util.Set<java.lang.String>	categoryO_I Words that change from "-o" to "-i" (like "libretto" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).
static java.util.Set<java.lang.String>	categoryOE_OES Words that change from "-oe" to "-oes" (like "toe" etc.), listed in their plural forms
static java.util.Set<java.lang.String>	categoryON_A Words that change from "-on" to "-a" (like "phenomenon" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).
static java.util.Set<java.lang.String>	categorySE_SES Words that end in "-se" in their plural forms (like "nurse" etc.) Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).
static java.util.Set<java.lang.String>	categorySSE_SSES Words that change from "-sse" to "-sses" (like "finesse" etc.), listed in their plural forms
static java.util.Set<java.lang.String>	categoryU_US Words that change from "-u" to "-us" (like "emu" etc.), listed in their plural forms
static java.util.Set<java.lang.String>	categoryUM_A Words that change from "-um" to "-a" (like "curriculum" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).
static java.util.Set<java.lang.String>	categoryUS_I Words that change from "-us" to "-i" (like "fungus" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).
static java.util.Map<java.lang.String,java.lang.String>	irregular Maps irregular Germanic English plural nouns to their singular form

Constructor Summary

PlingStemmer()

Method Summary

boolean	isPlural(java.lang.String s) Tells whether a noun is plural.
boolean	isSingular(java.lang.String s) Tells whether a word form is singular.
boolean	isSingularAndPlural(java.lang.String s) Tells whether a word form is the singular form of one word and at the same time the plural form of another.
static void	main(java.lang.String[] argv) Test routine
java.lang.String	stem(java.lang.String s) Stems an English noun

Methods inherited from class java.lang.Object

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

Field Detail

categorySE_SES

public static java.util.Set<java.lang.String> categorySE_SES

Words that end in "-se" in their plural forms (like "nurse" etc.) Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).

Invisible:

category00

public static java.util.Set<java.lang.String> category00

Words that do not have a distinct plural form (like "atlas" etc.)

categoryUM_A

public static java.util.Set<java.lang.String> categoryUM_A

Words that change from "-um" to "-a" (like "curriculum" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).

Invisible:

categoryON_A

public static java.util.Set<java.lang.String> categoryON_A

Words that change from "-on" to "-a" (like "phenomenon" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).

Invisible:

categoryO_I

public static java.util.Set<java.lang.String> categoryO_I

Words that change from "-o" to "-i" (like "libretto" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).

Invisible:

categoryUS_I

public static java.util.Set<java.lang.String> categoryUS_I

Words that change from "-us" to "-i" (like "fungus" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).

Invisible:

categoryIX_ICES

public static java.util.Set<java.lang.String> categoryIX_ICES

Words that change from "-ix" to "-ices" (like "appendix" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).

Invisible:

categoryIS_ES

public static java.util.Set<java.lang.String> categoryIS_ES

Words that change from "-is" to "-es" (like "axis" etc.), listed in their plural forms Borrowed from the PlingStemmer stemmer implementation included in the Java Tools pacakge (see http://mpii.de/yago-naga/javatools).

Invisible:

categoryOE_OES

public static java.util.Set<java.lang.String> categoryOE_OES

Words that change from "-oe" to "-oes" (like "toe" etc.), listed in their plural forms

categoryEX_ICES

public static java.util.Set<java.lang.String> categoryEX_ICES

Words that change from "-ex" to "-ices" (like "index" etc.), listed in their plural forms

categoryU_US

public static java.util.Set<java.lang.String> categoryU_US

Words that change from "-u" to "-us" (like "emu" etc.), listed in their plural forms

categorySSE_SSES

public static java.util.Set<java.lang.String> categorySSE_SSES

Words that change from "-sse" to "-sses" (like "finesse" etc.), listed in their plural forms

categoryCHE_CHES

public static java.util.Set<java.lang.String> categoryCHE_CHES

Words that change from "-che" to "-ches" (like "brioche" etc.), listed in their plural forms

categoryICS

public static java.util.Set<java.lang.String> categoryICS

Words that end with "-ics" and do not exist as nouns without the 's' (like "aerobics" etc.)

categoryIE_IES

public static java.util.Set<java.lang.String> categoryIE_IES

Words that change from "-ie" to "-ies" (like "auntie" etc.), listed in their plural forms

irregular

public static java.util.Map<java.lang.String,java.lang.String> irregular

Maps irregular Germanic English plural nouns to their singular form

Constructor Detail

PlingStemmer

public PlingStemmer()

Method Detail

isPlural

public boolean isPlural(java.lang.String s)

Tells whether a noun is plural.

isSingular

public boolean isSingular(java.lang.String s)

Tells whether a word form is singular. Note that a word can be both plural and singular

isSingularAndPlural

public boolean isSingularAndPlural(java.lang.String s)

Tells whether a word form is the singular form of one word and at the same time the plural form of another.

stem

public java.lang.String stem(java.lang.String s)

Stems an English noun

Specified by:

stem in interface RiStemmerIF

main

public static void main(java.lang.String[] argv)
                 throws java.lang.Exception

Test routine

Throws:

java.lang.Exception