opennlp.tools.parser

Class ChunkContextGenerator

java.lang.Object

opennlp.tools.parser.ChunkContextGenerator

All Implemented Interfaces:

ChunkerContextGenerator, BeamSearchContextGenerator<String>

public class ChunkContextGenerator
extends Object
implements ChunkerContextGenerator

Creates predivtive context for the pre-chunking phases of parsing.

Constructor Summary

Constructors

Constructor and Description
ChunkContextGenerator()
ChunkContextGenerator(int cacheSize)

Method Summary

Methods

Modifier and Type	Method and Description
String[]	getContext(int i, String[] words, String[] prevDecisions, Object[] ac) Returns the context for the specified position in the specified sequence (list).
String[]	getContext(int i, String[] words, String[] tags, String[] preds) Returns the contexts for chunking of the specified index.
String[]	getContext(Object o)

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkContextGenerator

public ChunkContextGenerator()

ChunkContextGenerator

public ChunkContextGenerator(int cacheSize)

Method Detail

getContext

public String[] getContext(Object o)

getContext

public String[] getContext(int i,
                  String[] words,
                  String[] prevDecisions,
                  Object[] ac)

Description copied from interface: BeamSearchContextGenerator

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

Specified by:

getContext in interface BeamSearchContextGenerator<String>

Parameters:

i - The index of the sequence.

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

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

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

Returns:

the context for the specified position in the specified sequence.

getContext

public String[] getContext(int i,
                  String[] words,
                  String[] tags,
                  String[] preds)

Description copied from interface: ChunkerContextGenerator

Returns the contexts for chunking of the specified index.

Specified by:

getContext in interface ChunkerContextGenerator

Parameters:

i - The index of the token in the specified toks array for which the context should be constructed.

words - The tokens of the sentence. The toString methods of these objects should return the token text.

tags - The POS tags for the the specified tokens.

preds - The previous decisions made in the taging of this sequence. Only indices less than i will be examined.

Returns:

An array of predictive contexts on which a model basis its decisions.