PlingStemmer

java.lang.Object
- javatools.parsers.PlingStemmer

```
public class PlingStemmer
extends java.lang.Object
```
This class is part of the Java Tools (see http://mpii.de/yago-naga/javatools). It is licensed under the Creative Commons Attribution License (see http://creativecommons.org/licenses/by/3.0) by the YAGO-NAGA team (see http://mpii.de/yago-naga). The PlingStemmer stems an English noun (plural or singular) to its singular form. It deals with "firemen"->"fireman", it knows Greek stuff like "appendices"->"appendix" and yes, it was a lot of work to compile these exceptions. Examples:
```
      System.out.println(PlingStemmer.stem("boy"));
      ----> boy
      System.out.println(PlingStemmer.stem("boys"));
      ----> boy
      System.out.println(PlingStemmer.stem("biophysics"));
      ---->  biophysics
      System.out.println(PlingStemmer.stem("automata"));
      ----> automaton
      System.out.println(PlingStemmer.stem("genus"));
      ----> genus
      System.out.println(PlingStemmer.stem("emus"));
      ----> emu
  
```
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.
It cannot be guaranteed that the stemmer correctly stems a plural word or correctly ignores a singular word -- let alone that it treats an ambiguous word form in the way expected by the user.
The PlingStemmer uses material from WordNet.
It requires the class FinalSet from the Java Tools.

Field Summary

Fields
Modifier and Type	Field and Description
`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
`static java.util.Set<java.lang.String>`	`categoryIX_ICES` Words that change from "-ix" to "-ices" (like "appendix" etc.), listed in their plural forms
`static java.util.Set<java.lang.String>`	`categoryO_I` Words that change from "-o" to "-i" (like "libretto" etc.), listed in their plural forms
`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
`static java.util.Set<java.lang.String>`	`categorySE_SES` Words that end in "-se" in their plural forms (like "nurse" etc.)
`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
`static java.util.Set<java.lang.String>`	`categoryUS_I` Words that change from "-us" to "-i" (like "fungus" etc.), listed in their plural forms
`static java.util.Map<java.lang.String,java.lang.String>`	`irregular` Maps irregular Germanic English plural nouns to their singular form
`static java.util.Set<java.lang.String>`	`singAndPlur` Contains word forms that can either be plural or singular

Constructor Summary

Constructors
Constructor and Description

PlingStemmer()

Constructors
Constructor and Description
`PlingStemmer()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static java.lang.String`	`cut(java.lang.String s, java.lang.String suffix)` Cuts a suffix from a string (that is the number of chars given by the suffix)
`static boolean`	`isPlural(java.lang.String s)` Tells whether a word form is plural.
`static boolean`	`isSingular(java.lang.String s)` Tells whether a word form is singular.
`static 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
`static boolean`	`noLatin(java.lang.String s)` Returns true if a word is probably not Latin
`static java.lang.String`	`stem(java.lang.String s)` Stems an English noun

Methods inherited from class java.lang.Object
clone, equals, finalize, 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.)
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - singAndPlur
```
public static java.util.Set<java.lang.String> singAndPlur
```
    Contains word forms that can either be plural or singular
- Constructor Detail
  - PlingStemmer
```
public PlingStemmer()
```
- Method Detail
  - isPlural
```
public static boolean isPlural(java.lang.String s)
```
    Tells whether a word form is plural. This method just checks whether the stem method alters the word
  - isSingular
```
public static 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 static 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.
  - cut
```
public static java.lang.String cut(java.lang.String s,
                                   java.lang.String suffix)
```
    Cuts a suffix from a string (that is the number of chars given by the suffix)
  - noLatin
```
public static boolean noLatin(java.lang.String s)
```
    Returns true if a word is probably not Latin
  - stem
```
public static java.lang.String stem(java.lang.String s)
```
    Stems an English noun
  - main
```
public static void main(java.lang.String[] argv)
                 throws java.lang.Exception
```
    Test routine
    
    Throws:
    
    java.lang.Exception

Class PlingStemmer

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

categorySE_SES

category00

categoryUM_A

categoryON_A

categoryO_I

categoryUS_I

categoryIX_ICES

categoryIS_ES

categoryOE_OES

categoryEX_ICES

categoryU_US

categorySSE_SSES

categoryCHE_CHES

categoryICS

categoryIE_IES

irregular

singAndPlur

Constructor Detail

PlingStemmer

Method Detail

isPlural

isSingular

isSingularAndPlural

cut

noLatin

stem

main