Package opennlp.tools.postag

Class DefaultPOSContextGenerator

java.lang.Object

opennlp.tools.postag.DefaultPOSContextGenerator

All Implemented Interfaces:

POSContextGenerator, BeamSearchContextGenerator<String>

public class DefaultPOSContextGenerator
extends Object
implements POSContextGenerator

A default context generator for a POSTagger.

See Also:

• POSTagger
• POSTaggerME

Constructor Summary

Constructors

Constructor	Description
DefaultPOSContextGenerator(int cacheSize, Dictionary dict)	Initializes a DefaultPOSContextGenerator instance.
DefaultPOSContextGenerator(Dictionary dict)	Initializes a DefaultPOSContextGenerator instance.

Method Summary

Modifier and Type	Method	Description
String[]	getContext(int index, Object[] tokens, String[] tags)	Returns the context for making a postag decision at the specified token index given the specified tokens and previous tags.
String[]	getContext(int index, String[] sequence, String[] priorDecisions, Object[] additionalContext)	Returns the context for making a postag decision at the specified token index given the specified tokens and previous tags.

Methods inherited from class java.lang.Object

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

Constructor Details

DefaultPOSContextGenerator

public DefaultPOSContextGenerator(Dictionary dict)

Initializes a DefaultPOSContextGenerator instance. A cache size of 0 will be used as default.

Parameters:

dict - The Dictionary to be used.

DefaultPOSContextGenerator

public DefaultPOSContextGenerator(int cacheSize,
 Dictionary dict)

Initializes a DefaultPOSContextGenerator instance.

Parameters:

cacheSize - The size of the Cache to set. Must be greater than 0 to have an effect.

dict - The Dictionary to be used.

Method Details

getContext

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

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

Specified by:

getContext in interface BeamSearchContextGenerator<String>

Specified by:

getContext in interface POSContextGenerator

Parameters:

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

sequence - The token sequence representing a sentence.

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

additionalContext - The context for additional information.

Returns:

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

getContext

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

Returns the context for making a postag 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 representing a sentence.

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

Returns:

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