org.apache.uima.examples.casMultiplier

Class SimpleTextMerger

java.lang.Object

org.apache.uima.analysis_component.AnalysisComponent_ImplBase

org.apache.uima.analysis_component.JCasMultiplier_ImplBase

org.apache.uima.examples.casMultiplier.SimpleTextMerger

All Implemented Interfaces:

org.apache.uima.analysis_component.AnalysisComponent

public class SimpleTextMerger
extends org.apache.uima.analysis_component.JCasMultiplier_ImplBase

An example CasMultiplier, which merges text documents into larger ones. It attempts to merge all of the segments that came from one original artifact. This is done by checking the "lastSegment" feature of the SourceDocumentInformation FeatureStructure, which is expected to be populated by the CollectionReader or CasMultiplier that produced the input CASes.

Limitations: if the lastSegment feature is never set to true by the component producing the input CASes, the merger will never produce any output. Also, this implementation relies on the CASes arriving in order, which could be a problem in a mulithreaded framework implementation. The order requirement could be relieved by recording a segment number in the SourceDocumentInformation, but that would also make this example more complicated.

Field Summary

Fields

Modifier and Type	Field and Description
static String	MESSAGE_DIGEST
static String	MISSING_SOURCE_DOCUMENT_INFO
static String	NO_NEXT_CAS

Constructor Summary

Constructors

Constructor and Description
SimpleTextMerger()

Method Summary

Modifier and Type	Method and Description
boolean	hasNext()
void	initialize(org.apache.uima.UimaContext aContext)
org.apache.uima.cas.AbstractCas	next()
void	process(org.apache.uima.jcas.JCas aJCas)

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

getCasInstancesRequired, getEmptyJCas, getRequiredCasInterface, process

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

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

Methods inherited from class java.lang.Object

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

Field Detail

MESSAGE_DIGEST

public static final String MESSAGE_DIGEST

See Also:

Constant Field Values

MISSING_SOURCE_DOCUMENT_INFO

public static final String MISSING_SOURCE_DOCUMENT_INFO

See Also:

Constant Field Values

NO_NEXT_CAS

public static final String NO_NEXT_CAS

See Also:

Constant Field Values

Constructor Detail

SimpleTextMerger

public SimpleTextMerger()

Method Detail

initialize

public void initialize(org.apache.uima.UimaContext aContext)
                throws org.apache.uima.resource.ResourceInitializationException

Specified by:

initialize in interface org.apache.uima.analysis_component.AnalysisComponent

Overrides:

initialize in class org.apache.uima.analysis_component.AnalysisComponent_ImplBase

Throws:

org.apache.uima.resource.ResourceInitializationException

process

public void process(org.apache.uima.jcas.JCas aJCas)
             throws org.apache.uima.analysis_engine.AnalysisEngineProcessException

Specified by:

process in class org.apache.uima.analysis_component.JCasMultiplier_ImplBase

Throws:

org.apache.uima.analysis_engine.AnalysisEngineProcessException

hasNext

public boolean hasNext()
                throws org.apache.uima.analysis_engine.AnalysisEngineProcessException

Throws:

org.apache.uima.analysis_engine.AnalysisEngineProcessException

next

public org.apache.uima.cas.AbstractCas next()
                                     throws org.apache.uima.analysis_engine.AnalysisEngineProcessException

Throws:

org.apache.uima.analysis_engine.AnalysisEngineProcessException