prajna.text

Class PhraseFinder

java.lang.Object

prajna.text.PhraseFinder

Direct Known Subclasses:

PhraseChunker

public class PhraseFinder
extends java.lang.Object

Finds noun phrases, verb phrases, and prepositional phrases. This class finds phrases by using a Part-of-Speech tagger or a previously determined set of Part-of-Speech tags, and then determining where the noun and verb phrases begin and end. It can work with any part-of-speech tagger that implements the PartOfSpeechTagger interface.

Author:

Edward Swing

Constructor Summary

Constructors

Constructor and Description
PhraseFinder() Initialize the PhraseFinder with no PartOfSpeech tagger.
PhraseFinder(PartOfSpeechTagger posTagger) Initialize the PhraseFinder using the provided Part-of-Speech tagger

Method Summary

Methods

Modifier and Type	Method and Description
void	addEntities(java.util.Set<java.lang.String> entitySet) Add known entities to allow the PhraseFinder to treat these as contiguous objects
java.util.List<Phrase>	findPhrases(java.util.List<PartOfSpeechTag> tagList) Find the list of phrases for a list of tags from a list of tags.
java.util.List<Phrase>	findPhrases(java.lang.String sentence) Find the list of phrases for a sentence
java.util.List<Phrase>	findPhrases(java.lang.String sentence, java.util.List<PartOfSpeechTag> tagList) Find the list of phrases for a list of tags from a sentence with the corresponding tag list.
PartOfSpeechTagger	getPosTagger() Get the Part-of-Speech tagger used by this PhraseFinder
void	setPosTagger(PartOfSpeechTagger posTagger) Set the Part-of-Speech tagger for this PhraseFinder\

Methods inherited from class java.lang.Object

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

Constructor Detail

PhraseFinder

public PhraseFinder()

Initialize the PhraseFinder with no PartOfSpeech tagger. If initialized without a PartOfSpeech tagger, the PhraseFinder will rely upon an external process to determine the part of speech tags for a sentence.

PhraseFinder

public PhraseFinder(PartOfSpeechTagger posTagger)

Initialize the PhraseFinder using the provided Part-of-Speech tagger

Parameters:

posTagger - the Part-of-Speech tagger

Method Detail

addEntities

public void addEntities(java.util.Set<java.lang.String> entitySet)

Add known entities to allow the PhraseFinder to treat these as contiguous objects

Parameters:

entitySet - a set of entities

findPhrases

public java.util.List<Phrase> findPhrases(java.util.List<PartOfSpeechTag> tagList)

Find the list of phrases for a list of tags from a list of tags. The list of tags is modified by this operation by combining entity tags into a single tag.

Parameters:

tagList - the list of tags representing the words in the sentence

Returns:

the list of phrases

findPhrases

public java.util.List<Phrase> findPhrases(java.lang.String sentence)

Find the list of phrases for a sentence

Parameters:

sentence - the sentence to parse

Returns:

the list of phrases

findPhrases

public java.util.List<Phrase> findPhrases(java.lang.String sentence,
                                 java.util.List<PartOfSpeechTag> tagList)

Find the list of phrases for a list of tags from a sentence with the corresponding tag list. The list of tags is modified by this operation by combining entity tags into a single tag.

Parameters:

sentence - the original sentence

tagList - the list of tags representing the words in the sentence

Returns:

the list of phrases

getPosTagger

public PartOfSpeechTagger getPosTagger()

Get the Part-of-Speech tagger used by this PhraseFinder

Returns:

the PartOfSpeechTagger

setPosTagger

public void setPosTagger(PartOfSpeechTagger posTagger)

Set the Part-of-Speech tagger for this PhraseFinder\

Parameters:

posTagger - the Part-of-Speech tagger