eu.slipo.athenarc.triplegeo.utils

Interface ReverseConverter

All Known Implementing Classes:

RdfToCsv, RdfToGeoJson, RdfToShp

public interface ReverseConverter

Reverse Conversion Interface for TripleGeo used in reconstructing (relational) records from an RDF graph.

Version:

2.0

Author:

Kostas Patroumpas

Method Summary

Modifier and Type	Method and Description
void	close() Closes output file, once all results have been written.
boolean	createSchema(java.util.List<java.lang.String> attrList, org.apache.jena.query.QuerySolution sol) Determines schema with all attribute names and their respective data types.
com.vividsolutions.jts.geom.Geometry	getGeometry(java.lang.String g) Identifies SRID (EPSG code) and geometry type from a WKT literal.
java.lang.String	getGeometrySpec(org.apache.jena.rdf.model.Literal g) Identifies SRID (EPSG code) and geometry type from a WKT literal.
java.lang.String	getGeometrySpec(java.lang.String g) Identifies SRID (EPSG code) and geometry type from a WKT string.
java.lang.Integer	store(java.util.List<java.lang.String> attrList, java.util.List<java.util.List<java.lang.String>> results) Creates a feature collection from current batch of records and writes them into the output file.

Method Detail

close

void close()

Closes output file, once all results have been written.

createSchema

boolean createSchema(java.util.List<java.lang.String> attrList,
                     org.apache.jena.query.QuerySolution sol)

Determines schema with all attribute names and their respective data types.

Parameters:

attrList - List of attribute names.

sol - A single result (record) from a SELECT query in SPARQL.

Returns:

True if attribute schema has been created successfully; otherwise, False.

getGeometrySpec

java.lang.String getGeometrySpec(org.apache.jena.rdf.model.Literal g)

Identifies SRID (EPSG code) and geometry type from a WKT literal. Applicable in reverse transformation into shapefile format.

Parameters:

g - A geometry WKT literal.

Returns:

A string that concatenates the geometry type and the SRID of the given WKT literal.

getGeometrySpec

java.lang.String getGeometrySpec(java.lang.String g)

Identifies SRID (EPSG code) and geometry type from a WKT string. Applicable in reverse transformation into CSV format.

Parameters:

g - A geometry WKT string.

Returns:

An extended WKT (EWKT) representation, which includes the SRID.

getGeometry

com.vividsolutions.jts.geom.Geometry getGeometry(java.lang.String g)

Identifies SRID (EPSG code) and geometry type from a WKT literal. Applicable in reverse transformation into GeoJson format.

Parameters:

g - A geometry WKT literal.

Returns:

store

java.lang.Integer store(java.util.List<java.lang.String> attrList,
                        java.util.List<java.util.List<java.lang.String>> results)

Creates a feature collection from current batch of records and writes them into the output file.

Parameters:

attrList - List of attribute names.

results - Collection of records in the current batch.

Returns:

The number of records resulted in the current batch.