Package com.janeirodigital.shapetrees.core.helpers

Class GraphHelper

java.lang.Object

com.janeirodigital.shapetrees.core.helpers.GraphHelper

public class GraphHelper
extends Object

Assorted helper methods related to RDF Graphs

Method Summary

Modifier and Type	Method	Description
static org.apache.jena.graph.Graph	getEmptyGraph()	Creates an empty Graph with initialized prefixes
static org.apache.jena.riot.Lang	getLangForContentType(String contentType)	Determine the Jena language (graph serialization type) based on a content type string
static URL	knownUrl(String urlString)
static org.apache.jena.graph.Triple	newTriple(String subject, String predicate, Object object)	Create a new triple statement with strings
static org.apache.jena.graph.Triple	newTriple(URI subject, URI predicate, Object object)	Create a new triple statement with URIs
static URL	nodeToUrl(org.apache.jena.graph.Node node)	Convert an RDFNode value to URL
static org.apache.jena.graph.Graph	readStringIntoGraph(URI baseURI, String rawContent, String contentType)	Deserializes a string into a Graph
static org.apache.jena.rdf.model.Model	readStringIntoModel(URI baseURI, String rawContent, String contentType)	Deserializes a string into a Model
static URL	removeUrlFragment(URL url)	Remove a fragment from a URL.
static URI	urlToUri(URL url)	Wrap conversion from URL to URI which should never fail on a well-formed URL.
static String	writeGraphToTurtleString(org.apache.jena.graph.Graph graph)	Writes a graph into a turtle serialization

Methods inherited from class java.lang.Object

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

Method Details

getLangForContentType

public static org.apache.jena.riot.Lang getLangForContentType(String contentType)

Determine the Jena language (graph serialization type) based on a content type string

Parameters:

contentType - Content type string

Returns:

Serialization language

writeGraphToTurtleString

public static String writeGraphToTurtleString(org.apache.jena.graph.Graph graph)

Writes a graph into a turtle serialization

Parameters:

graph - Graph to serialize

Returns:

String in TTL serialization

readStringIntoModel

public static org.apache.jena.rdf.model.Model readStringIntoModel(URI baseURI,
 String rawContent,
 String contentType)
                                                           throws ShapeTreeException

Deserializes a string into a Model

Parameters:

baseURI - Base URI to use for statements

rawContent - String of RDF

contentType - Content type of content

Returns:

Deserialized model

Throws:

ShapeTreeException - ShapeTreeException

readStringIntoGraph

public static org.apache.jena.graph.Graph readStringIntoGraph(URI baseURI,
 String rawContent,
 String contentType)
                                                       throws ShapeTreeException

Deserializes a string into a Graph

Parameters:

baseURI - Base URI to use for statements

rawContent - String of RDF

contentType - Content type of content

Returns:

Deserialized graph

Throws:

ShapeTreeException - ShapeTreeException

getEmptyGraph

public static org.apache.jena.graph.Graph getEmptyGraph()

Creates an empty Graph with initialized prefixes

Returns:

Graph Empty Graph

newTriple

public static org.apache.jena.graph.Triple newTriple(URI subject,
 URI predicate,
 Object object)
                                              throws ShapeTreeException

Create a new triple statement with URIs

Parameters:

subject - Subject to include

predicate - Predicate to include

object - Object to include

Returns:

Throws:

ShapeTreeException

newTriple

public static org.apache.jena.graph.Triple newTriple(String subject,
 String predicate,
 Object object)
                                              throws ShapeTreeException

Create a new triple statement with strings

Parameters:

subject - Subject to include

predicate - Predicate to include

object - Object to include

Returns:

Throws:

ShapeTreeException

urlToUri

public static URI urlToUri(URL url)

Wrap conversion from URL to URI which should never fail on a well-formed URL.

Parameters:

url - covert this URL to a URI

Returns:

IRI java native object for a URI (useful for Jena graph operations)

nodeToUrl

public static URL nodeToUrl(org.apache.jena.graph.Node node)
                     throws ShapeTreeException

Convert an RDFNode value to URL

Parameters:

node - RDFNode to convert

Returns:

Converted URL

Throws:

ShapeTreeException

removeUrlFragment

public static URL removeUrlFragment(URL url)

Remove a fragment from a URL. Returns the same URL if there is no fragment

Parameters:

url - to remove fragment from

Returns:

URL without fragment

knownUrl

public static URL knownUrl(String urlString)