Package opennlp.tools.postag

Class ConfigurablePOSContextGenerator

java.lang.Object

opennlp.tools.postag.ConfigurablePOSContextGenerator

All Implemented Interfaces:

opennlp.tools.postag.POSContextGenerator, opennlp.tools.util.BeamSearchContextGenerator<String>

@ThreadSafe
public class ConfigurablePOSContextGenerator
extends Object
implements opennlp.tools.postag.POSContextGenerator

A configurable context generator for a POSTagger. This implementation makes use of AdaptiveFeatureGenerator.

The per-sentence context cache is maintained per-thread via ThreadLocal, making this class safe for concurrent use.

Note: In container environments with classloader isolation (e.g. Jakarta EE), ThreadLocal state may pin the classloader. Ensure instances do not outlive the application's lifecycle, or call ThreadLocal.remove() on pooled threads.

See Also:

• POSTagger
• POSTaggerME
• DefaultPOSContextGenerator

Constructor Summary

Constructors

Constructor	Description
ConfigurablePOSContextGenerator(int cacheSize, opennlp.tools.util.featuregen.AdaptiveFeatureGenerator featureGenerator)	Initializes a ConfigurablePOSContextGenerator instance with an optional per-thread context cache.
ConfigurablePOSContextGenerator(opennlp.tools.util.featuregen.AdaptiveFeatureGenerator featureGenerator)	Initializes a ConfigurablePOSContextGenerator instance.

Method Summary

Modifier and Type	Method	Description
String[]	getContext(int index, String[] tokens, String[] tags, Object[] additionalContext)

Methods inherited from class java.lang.Object

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

Constructor Details

ConfigurablePOSContextGenerator

public ConfigurablePOSContextGenerator(opennlp.tools.util.featuregen.AdaptiveFeatureGenerator featureGenerator)

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

Parameters:

featureGenerator - The AdaptiveFeatureGenerator to be used.

ConfigurablePOSContextGenerator

public ConfigurablePOSContextGenerator(int cacheSize,
 opennlp.tools.util.featuregen.AdaptiveFeatureGenerator featureGenerator)

Initializes a ConfigurablePOSContextGenerator instance with an optional per-thread context cache.

Parameters:

cacheSize - The size of the per-thread context cache. Use 0 to disable caching.

featureGenerator - The AdaptiveFeatureGenerator to be used.

Method Details

getContext

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

Specified by:

getContext in interface opennlp.tools.util.BeamSearchContextGenerator<String>

Specified by:

getContext in interface opennlp.tools.postag.POSContextGenerator