eu.slipo.athenarc.triplegeo.utils

Class BatchReverseConverter

java.lang.Object

eu.slipo.athenarc.triplegeo.utils.BatchReverseConverter

public class BatchReverseConverter
extends java.lang.Object

Recreates a disk-based RDF graph and extracts its contents through a user-specified SELECT query in SPARQL. Results can be written to a typical geographical files (currently supported: CSV and ESRI Shapefiles). Attribute names in the SELECT query will become the column names in the resulting files.

Version:

2.0

Author:

Kostas Patroumpas

Field Summary

Fields

Modifier and Type	Field and Description
(package private) java.util.List<java.lang.String>	attrList
(package private) java.util.Map<java.lang.String,java.lang.Integer>	attrStatistics
private ReverseConfiguration	currentConfig
(package private) org.apache.jena.query.Dataset	dataset
(package private) java.lang.String	dir
(package private) java.lang.String[]	inputFiles
(package private) org.apache.jena.rdf.model.Model	model
(package private) Assistant	myAssistant
int	numRecs
int	numTriples
int	numValues
(package private) java.util.List<java.util.List<java.lang.String>>	results
private long	t_start

Constructor Summary

Constructors

Constructor and Description
BatchReverseConverter(ReverseConfiguration config, java.lang.String[] inFiles) Constructs a ReverseConverter object.

Method Summary

Modifier and Type	Method and Description
void	closeModel() Closes the graph model and releases all system resources.
void	createModel() Creates a graph that can store RDF triples and enable SPARQL queries.
void	queryModel(java.lang.String sparql, ReverseConverter conv) Submits a SPARQL query and evaluates it against this model.
private void	updateStatistics(java.lang.String attrKey) Update statistics (currently only a counter) of values transformed for a particular attribute

Methods inherited from class java.lang.Object

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

Field Detail

myAssistant

Assistant myAssistant

inputFiles

java.lang.String[] inputFiles

dataset

org.apache.jena.query.Dataset dataset

dir

java.lang.String dir

model

org.apache.jena.rdf.model.Model model

results

java.util.List<java.util.List<java.lang.String>> results

attrList

java.util.List<java.lang.String> attrList

attrStatistics

java.util.Map<java.lang.String,java.lang.Integer> attrStatistics

currentConfig

private ReverseConfiguration currentConfig

numRecs

public int numRecs

numValues

public int numValues

numTriples

public int numTriples

t_start

private long t_start

Constructor Detail

BatchReverseConverter

public BatchReverseConverter(ReverseConfiguration config,
                             java.lang.String[] inFiles)

Constructs a ReverseConverter object.

Parameters:

config - User-specified configuration for the reverse transformation process.

inFiles - Array of input file names

Method Detail

createModel

public void createModel()

Creates a graph that can store RDF triples and enable SPARQL queries.

closeModel

public void closeModel()

Closes the graph model and releases all system resources.

queryModel

public void queryModel(java.lang.String sparql,
                       ReverseConverter conv)

Submits a SPARQL query and evaluates it against this model.

Parameters:

sparql - A SELECT query in SPARQL against the RDF graph. Syntax must comply will the ontology of the model.

conv - A ReverseConverter object that will apply the reverse transformation against the results of the query.

updateStatistics

private void updateStatistics(java.lang.String attrKey)

Update statistics (currently only a counter) of values transformed for a particular attribute

Parameters:

attrKey - The name of the attribute