CharacterNgramFeatureGenerator (Apache OpenNLP Tools 2.1.0 API)

java.lang.Object
- opennlp.tools.util.featuregen.CharacterNgramFeatureGenerator

All Implemented Interfaces:

AdaptiveFeatureGenerator
```
public class CharacterNgramFeatureGenerator
extends Object
implements AdaptiveFeatureGenerator
```
The CharacterNgramFeatureGenerator uses character ngrams to generate features about each token. The minimum and maximum length can be specified.

Constructor Summary

Constructors
Constructor	Description
`CharacterNgramFeatureGenerator()`	Initializes the current instance with min 2 length and max 5 length of ngrams.
`CharacterNgramFeatureGenerator(int minLength, int maxLength)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`createFeatures(List<String> features, String[] tokens, int index, String[] preds)`	Adds the appropriate features for the token at the specified index with the specified array of previous outcomes to the specified list of features.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface opennlp.tools.util.featuregen.AdaptiveFeatureGenerator
clearAdaptiveData, updateAdaptiveData

- Constructor Detail
  - CharacterNgramFeatureGenerator
```
public CharacterNgramFeatureGenerator(int minLength,
                                      int maxLength)
```
  - CharacterNgramFeatureGenerator
```
public CharacterNgramFeatureGenerator()
```
    Initializes the current instance with min 2 length and max 5 length of ngrams.
- Method Detail
  - createFeatures
```
public void createFeatures(List<String> features,
                           String[] tokens,
                           int index,
                           String[] preds)
```
    Description copied from interface: AdaptiveFeatureGenerator
    
    Adds the appropriate features for the token at the specified index with the specified array of previous outcomes to the specified list of features.
    
    Specified by:
    
    createFeatures in interface AdaptiveFeatureGenerator
    
    Parameters:
    
    features - The list of features to be added to.
    
    tokens - The tokens of the sentence or other text unit being processed.
    
    index - The index of the token which is currently being processed.
    
    preds - The outcomes for the tokens prior to the specified index.