de.tudarmstadt.ukp.dkpro.core.snowball

Class SnowballStemmer

java.lang.Object

org.apache.uima.analysis_component.AnalysisComponent_ImplBase

org.apache.uima.analysis_component.Annotator_ImplBase

org.apache.uima.analysis_component.JCasAnnotator_ImplBase

org.apache.uima.fit.component.JCasAnnotator_ImplBase

de.tudarmstadt.ukp.dkpro.core.api.featurepath.FeaturePathAnnotatorBase

de.tudarmstadt.ukp.dkpro.core.snowball.SnowballStemmer

All Implemented Interfaces:

org.apache.uima.analysis_component.AnalysisComponent

public class SnowballStemmer
extends FeaturePathAnnotatorBase

UIMA wrapper for the Snowball stemmer. Annotation types to be stemmed can be configured by a FeaturePath.

If you use this component in a pipeline which uses stop word removal, make sure that it runs after the stop word removal step, so only words that are no stop words are stemmed.

Since:

1.1.0

See Also:

Snowball stemmer homepage, FeaturePathAnnotatorBase

Field Summary

Fields

Modifier and Type	Field and Description
protected String	language
static Map<String,String>	languages
protected boolean	lowerCase
static String	PARAM_LANGUAGE Use this language instead of the document language to resolve the model.
static String	PARAM_LOWER_CASE Per default the stemmer runs in case-sensitive mode.

Fields inherited from class de.tudarmstadt.ukp.dkpro.core.api.featurepath.FeaturePathAnnotatorBase

filterCondition, filterConditionOperator, filterConditionValue, filterFeaturePath, filterFeaturePathInfo, fp, PARAM_FILTER_CONDITION_OPERATOR, PARAM_FILTER_CONDITION_VALUE, PARAM_FILTER_FEATUREPATH, PARAM_PATHS, paths

Constructor Summary

Constructors

Constructor and Description
SnowballStemmer()

Method Summary

Modifier and Type	Method and Description
protected void	generateAnnotations(org.apache.uima.jcas.JCas jcas) Method to create annotations.
protected Set<String>	getDefaultPaths()

Methods inherited from class de.tudarmstadt.ukp.dkpro.core.api.featurepath.FeaturePathAnnotatorBase

initialize, initializeFeaturePathInfoFrom, process

Methods inherited from class org.apache.uima.fit.component.JCasAnnotator_ImplBase

getLogger

Methods inherited from class org.apache.uima.analysis_component.JCasAnnotator_ImplBase

getRequiredCasInterface, process

Methods inherited from class org.apache.uima.analysis_component.Annotator_ImplBase

getCasInstancesRequired, hasNext, next

Methods inherited from class org.apache.uima.analysis_component.AnalysisComponent_ImplBase

batchProcessComplete, collectionProcessComplete, destroy, getContext, getResultSpecification, reconfigure, setResultSpecification

Methods inherited from class java.lang.Object

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

Field Detail

PARAM_LANGUAGE

public static final String PARAM_LANGUAGE

Use this language instead of the document language to resolve the model.

See Also:

Constant Field Values

language

protected String language

PARAM_LOWER_CASE

public static final String PARAM_LOWER_CASE

Per default the stemmer runs in case-sensitive mode. If this parameter is enabled, tokens are lower-cased before being passed to the stemmer.

Examples

	false (default)	true
EDUCATIONAL	EDUCATIONAL	educ
Educational	Educat	educ
educational	educ	educ

See Also:

Constant Field Values

lowerCase

protected boolean lowerCase

languages

public static final Map<String,String> languages

Constructor Detail

SnowballStemmer

public SnowballStemmer()

Method Detail

getDefaultPaths

protected Set<String> getDefaultPaths()

Overrides:

getDefaultPaths in class FeaturePathAnnotatorBase

generateAnnotations

protected void generateAnnotations(org.apache.uima.jcas.JCas jcas)
                            throws org.apache.uima.analysis_engine.AnalysisEngineProcessException,
                                   FeaturePathException

Description copied from class: FeaturePathAnnotatorBase

Method to create annotations.

Specified by:

generateAnnotations in class FeaturePathAnnotatorBase

Parameters:

jcas - the JCas.

Throws:

org.apache.uima.analysis_engine.AnalysisEngineProcessException - if another error occurs.

FeaturePathException - if an error occurs during initialization of the FeaturePathInfo object