edu.cornell.mannlib.vitro.webapp.rdfservice

Class ResultSetConsumer

java.lang.Object

edu.cornell.mannlib.vitro.webapp.rdfservice.ResultSetConsumer

Direct Known Subclasses:

ResultSetConsumer.Chaining, ResultSetConsumer.HasResult

public abstract class ResultSetConsumer
extends Object

Base class for creating consumers of ResultSets processQuerySolution MUST be overridden - it takes each QuerySolution in turn until the ResultSet is complete startProcessing and endProcessing may be overridden if the implementation needs to know when the processing starts, or when there are no more solutions left to process.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ResultSetConsumer.Chaining Helper implemenation of ResutSetConsumer that can be used to wrap another ResultSetConsumer - useful for filtering implementations
static class	ResultSetConsumer.HasResult Helper implementation that allows you to find out simply if there were any results in the ResultSet

Constructor Summary

Constructors

Constructor and Description
ResultSetConsumer()

Method Summary

Modifier and Type	Method and Description
protected void	endProcessing() Method to notify the consumer that all QuerySolutions have been processed
protected List<String>	getResultVars() Helper method to allow an implementation to get the var names from the resultset
protected abstract void	processQuerySolution(org.apache.jena.query.QuerySolution qs) Method for processing each QuerySolution - must be overridden in each implementation
void	processResultSet(org.apache.jena.query.ResultSet rs) Helper method that ensures the start / end processing is done correctly
protected void	startProcessing() Method to notify the consumer that a ResultSet is valid and is about to be processed

Methods inherited from class java.lang.Object

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

Constructor Detail

ResultSetConsumer

public ResultSetConsumer()

Method Detail

processQuerySolution

protected abstract void processQuerySolution(org.apache.jena.query.QuerySolution qs)

Method for processing each QuerySolution - must be overridden in each implementation

Parameters:

qs - - the current query solution

startProcessing

protected void startProcessing()

Method to notify the consumer that a ResultSet is valid and is about to be processed

endProcessing

protected void endProcessing()

Method to notify the consumer that all QuerySolutions have been processed

processResultSet

public void processResultSet(org.apache.jena.query.ResultSet rs)

Helper method that ensures the start / end processing is done correctly

Parameters:

rs - - the ResultSet to process

getResultVars

protected final List<String> getResultVars()

Helper method to allow an implementation to get the var names from the resultset

Returns:

list of result set var names