eu.slipo.athenarc.triplegeo.tools

Class RdfToShp

java.lang.Object

eu.slipo.athenarc.triplegeo.tools.RdfToShp

All Implemented Interfaces:

ReverseConverter

public class RdfToShp
extends java.lang.Object
implements ReverseConverter

Main entry point of the utility for reconverting triples from a RDF graph into an ESRI Shapefile. LIMITATIONS: The Shapefile format has several limitations: - The GEOMETRY attribute is always declared first, and can only store geometries of a single type; - Geometries must be of one of the following types: Point, MultiPoint, MuiltiLineString, MultiPolygon; - Attribute names are limited in length (max 10 characters); otherwise, they get truncated; - Not all data types can be supported (e.g., Timestamp values must be represented as Strings).

Version:

2.0

Author:

Kostas Patroumpas

Field Summary

Fields

Modifier and Type	Field and Description
(package private) java.lang.String	attrGeom
private static org.opengis.referencing.crs.CRSAuthorityFactory	crsFactory
private ReverseConfiguration	currentConfig
private java.lang.String	encoding
(package private) org.geotools.feature.simple.SimpleFeatureBuilder	featureBuilder
(package private) org.geotools.data.simple.SimpleFeatureSource	featureSource
(package private) org.geotools.data.simple.SimpleFeatureStore	featureStore
(package private) java.lang.String	geomType
(package private) Assistant	myAssistant
(package private) org.geotools.data.shapefile.ShapefileDataStore	newDataStore
(package private) int	numRecs
private java.lang.String	outputFile
(package private) com.vividsolutions.jts.io.WKTReader	reader
private org.opengis.referencing.operation.MathTransform	reproject
(package private) int	sourceSRID
(package private) int	targetSRID
(package private) org.geotools.data.Transaction	transaction
(package private) java.lang.String	typeName

Constructor Summary

Constructors

Constructor and Description
RdfToShp(ReverseConfiguration config, java.lang.String outFile, int sourceSRID, int targetSRID) Constructor for the reverse transformation process from RDF to ESRI shapefile.

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) Determine schema with all attribute names and their 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 shapefile.

Methods inherited from class java.lang.Object

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

Field Detail

myAssistant

Assistant myAssistant

reproject

private org.opengis.referencing.operation.MathTransform reproject

reader

com.vividsolutions.jts.io.WKTReader reader

sourceSRID

int sourceSRID

targetSRID

int targetSRID

currentConfig

private ReverseConfiguration currentConfig

outputFile

private java.lang.String outputFile

encoding

private java.lang.String encoding

newDataStore

org.geotools.data.shapefile.ShapefileDataStore newDataStore

featureBuilder

org.geotools.feature.simple.SimpleFeatureBuilder featureBuilder

geomType

java.lang.String geomType

typeName

java.lang.String typeName

attrGeom

java.lang.String attrGeom

featureSource

org.geotools.data.simple.SimpleFeatureSource featureSource

featureStore

org.geotools.data.simple.SimpleFeatureStore featureStore

transaction

org.geotools.data.Transaction transaction

numRecs

int numRecs

crsFactory

private static final org.opengis.referencing.crs.CRSAuthorityFactory crsFactory

Constructor Detail

RdfToShp

public RdfToShp(ReverseConfiguration config,
                java.lang.String outFile,
                int sourceSRID,
                int targetSRID)

Constructor for the reverse transformation process from RDF to ESRI shapefile.

Parameters:

config - Parameters for Reverse Transformation.

outFile - Path to the output shapefile.

sourceSRID - Spatial reference system (EPSG code) of geometries in the input RDF triples

targetSRID - Spatial reference system (EPSG code) of the output shapefile

Method Detail

close

public void close()

Closes output file, once all results have been written.

Specified by:

close in interface ReverseConverter

createSchema

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

Determine schema with all attribute names and their data types.

Specified by:

createSchema in interface ReverseConverter

Parameters:

attrList - List of attribute names. Attributes in the schema will be created in the same order as specified in the SELECT query that fetches results from the RDF graph.

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

Returns:

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

getGeometrySpec

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

Identifies SRID (EPSG code) and geometry type from a WKT literal.

Specified by:

getGeometrySpec in interface ReverseConverter

Parameters:

g - A geometry WKT literal.

Returns:

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

store

public 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 shapefile.

Specified by:

store in interface ReverseConverter

Parameters:

attrList - List of attribute names.

results - Collection of records in the current batch.

Returns:

The number of records resulted in the current batch.

getGeometrySpec

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

Description copied from interface: ReverseConverter

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

Specified by:

getGeometrySpec in interface ReverseConverter

Parameters:

g - A geometry WKT string.

Returns:

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

getGeometry

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

Description copied from interface: ReverseConverter

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

Specified by:

getGeometry in interface ReverseConverter

Parameters:

g - A geometry WKT literal.

Returns: