prajna.entity.lingpipe

Class PhraseChunker

java.lang.Object

prajna.text.PhraseFinder

prajna.entity.lingpipe.PhraseChunker

All Implemented Interfaces:

com.aliasi.chunk.Chunker

public class PhraseChunker
extends PhraseFinder
implements com.aliasi.chunk.Chunker

This class is an implementation of the LingPipe chunker which separates sentences into noun phrases and verb phrases. This chunker expects to chunk one sentence at a time.

This class is a derivation of a class from the Lingpipe software, and includes significant code segments from the original class. The Prajna Project respects all rights of the original class.

Author:

Edward Swing

Constructor Summary

Constructors

Constructor and Description
PhraseChunker() Create a PhraseChunker using the default tokenizer factory and Part of Speech tagger.
PhraseChunker(java.lang.String modelPath) Create a PhraseChunker using the specified HMM model path.

Method Summary

Methods

Modifier and Type	Method and Description
com.aliasi.chunk.Chunking	chunk(char[] charArray, int start, int end) Chunk the given character array into a series of noun and verb phrases
com.aliasi.chunk.Chunking	chunk(java.lang.CharSequence cSeq) Chunk the given character sequence into a series of noun and verb phrases

Methods inherited from class prajna.text.PhraseFinder

addEntities, findPhrases, findPhrases, findPhrases, getPosTagger, setPosTagger

Methods inherited from class java.lang.Object

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

Constructor Detail

PhraseChunker

public PhraseChunker()

Create a PhraseChunker using the default tokenizer factory and Part of Speech tagger. This method uses a LingpipePosTagger, which should be configured prior to calling this constructor.

PhraseChunker

public PhraseChunker(java.lang.String modelPath)

Create a PhraseChunker using the specified HMM model path. The modelPath should point to a Hidden Markov Model for Part of Speech tagging.

Parameters:

modelPath - path to the Hidden Markov Model for Part of Speech tagging

Method Detail

chunk

public com.aliasi.chunk.Chunking chunk(char[] charArray,
                              int start,
                              int end)

Chunk the given character array into a series of noun and verb phrases

Specified by:

chunk in interface com.aliasi.chunk.Chunker

Parameters:

charArray - the character array

start - the starting index in the array

end - the ending index in the array

Returns:

a Chunking containing the sequence of noun and verb phrases

chunk

public com.aliasi.chunk.Chunking chunk(java.lang.CharSequence cSeq)

Chunk the given character sequence into a series of noun and verb phrases

Specified by:

chunk in interface com.aliasi.chunk.Chunker

Parameters:

cSeq - the character sequence

Returns:

a Chunking containing the sequence of noun and verb phrases