opennlp.tools.postag
Class DefaultPOSContextGenerator

java.lang.Object
  opennlp.tools.postag.DefaultPOSContextGenerator

All Implemented Interfaces:

POSContextGenerator, BeamSearchContextGenerator

public class DefaultPOSContextGenerator
extends java.lang.Object
implements POSContextGenerator

A context generator for the POS Tagger.

Version:

$Revision: 1.17 $, $Date: 2008/03/05 16:45:13 $

Author:

Gann Bierner, Tom Morton

Field Summary

protected java.lang.String	SB
protected java.lang.String	SE

Constructor Summary

DefaultPOSContextGenerator(Dictionary dict)
Initializes the current instance.

DefaultPOSContextGenerator(int cacheSize, Dictionary dict)
Initializes the current instance.

Method Summary

java.lang.String[]	getContext(int index, java.lang.Object[] tokens, java.lang.String[] tags) Returns the context for making a pos tag decision at the specified token index given the specified tokens and previous tags.
java.lang.String[]	getContext(int index, java.lang.Object[] sequence, java.lang.String[] priorDecisions, java.lang.Object[] additionalContext) Returns the context for the specified position in the specified sequence (list).
protected static java.lang.String[]	getPrefixes(java.lang.String lex)
protected static java.lang.String[]	getSuffixes(java.lang.String lex)

Methods inherited from class java.lang.Object

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

Field Detail

SE

protected final java.lang.String SE

See Also:

Constant Field Values

SB

protected final java.lang.String SB

See Also:

Constant Field Values

Constructor Detail

DefaultPOSContextGenerator

public DefaultPOSContextGenerator(Dictionary dict)

Initializes the current instance.

Parameters:

dict -

DefaultPOSContextGenerator

public DefaultPOSContextGenerator(int cacheSize,
                                  Dictionary dict)

Initializes the current instance.

Parameters:

cacheSize -

dict -

Method Detail

getPrefixes

protected static java.lang.String[] getPrefixes(java.lang.String lex)

getSuffixes

protected static java.lang.String[] getSuffixes(java.lang.String lex)

getContext

public java.lang.String[] getContext(int index,
                                     java.lang.Object[] sequence,
                                     java.lang.String[] priorDecisions,
                                     java.lang.Object[] additionalContext)

Description copied from interface: BeamSearchContextGenerator

Returns the context for the specified position in the specified sequence (list).

Specified by:

getContext in interface POSContextGenerator

Specified by:

getContext in interface BeamSearchContextGenerator

Parameters:

index - The index of the sequence.

sequence - The sequence of items over which the beam search is performed.

priorDecisions - The sequence of decisions made prior to the context for which this decision is being made.

additionalContext - Any addition context specific to a class implementing this interface.

Returns:

the context for the specified position in the specified sequence.

getContext

public java.lang.String[] getContext(int index,
                                     java.lang.Object[] tokens,
                                     java.lang.String[] tags)

Returns the context for making a pos tag decision at the specified token index given the specified tokens and previous tags.

Parameters:

index - The index of the token for which the context is provided.

tokens - The tokens in the sentence.

tags - The tags assigned to the previous words in the sentence.

Returns:

The context for making a pos tag decision at the specified token index given the specified tokens and previous tags.