com.epimorphics.rdfutil

Class RDFUtil

java.lang.Object

com.epimorphics.rdfutil.RDFUtil

public class RDFUtil
extends Object

Misc. collection of Model/Resouce level utilities

Author:

Dave Reynolds

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.jena.rdf.model.Property[]	descriptionProps
static org.apache.jena.rdf.model.Property[]	labelProps

Constructor Summary

Constructors

Constructor and Description
RDFUtil()

Method Summary

Modifier and Type	Method and Description
static Set<org.apache.jena.rdf.model.Property>	allPropertiesOf(org.apache.jena.rdf.model.Resource r) Return a collection of all the distinct properties of the given resource
static List<org.apache.jena.rdf.model.Resource>	allResourceValues(org.apache.jena.rdf.model.Resource resource, org.apache.jena.rdf.model.Property p) Return a list of all the resource-values of the property on the resource
static org.apache.jena.rdf.model.Property	asProperty(org.apache.jena.rdf.model.Resource r) Create a property with the same URI as the given resource
static org.apache.jena.rdf.model.RDFNode	asRDFNode(Object val) Convert an arbitrary value to a RDF node.
static long	asTimestamp(org.apache.jena.rdf.model.RDFNode n) Convert a datetime literal to a unix style date stamp
static void	copyProperty(org.apache.jena.rdf.model.Resource src, org.apache.jena.rdf.model.Resource dest, org.apache.jena.rdf.model.Property p) Copy all values of the given property from the source to the dest resource
static void	copyProperty(org.apache.jena.rdf.model.Resource src, org.apache.jena.rdf.model.Resource dest, org.apache.jena.rdf.model.Property p, org.apache.jena.rdf.model.Property newp) Copy all values of p from src to values of newp on dest.
static org.apache.jena.rdf.model.RDFNode	deserialize(String ser) Decode a serlialized RDFNode, not associated with any useful model
static String	findLangMatchValue(org.apache.jena.rdf.model.Resource root, String language, org.apache.jena.rdf.model.Property... props) Checks the list of properties for one for which we can return a string which either matches the given language or a plain-literal
static org.apache.jena.rdf.model.Resource	findRoot(org.apache.jena.rdf.model.Model m) Return the root resource of a model (or the first root we find if there are multiple).
static List<org.apache.jena.rdf.model.Resource>	findRoots(org.apache.jena.rdf.model.Model m) Return all the root resources of a model
static org.apache.jena.rdf.model.Literal	fromDateTime(long date) Create a datetime literal representing the given Date (in unix ms since epoch style)
static org.apache.jena.rdf.model.RDFNode	getAPropertyValue(org.apache.jena.rdf.model.Resource root, org.apache.jena.rdf.model.Property[] props) Return the first available value for the given list of properties
static boolean	getBooleanValue(org.apache.jena.rdf.model.Resource r, org.apache.jena.rdf.model.Property p, boolean ifAbsent) Answer the boolean value of property p on resource r.
static String	getDescription(org.apache.jena.rdf.model.Resource root) Return a description for the given resource
static String	getDescription(org.apache.jena.rdf.model.Resource root, String lang) Return a description for the given resource
static Double	getDoubleValue(org.apache.jena.rdf.model.Resource x, org.apache.jena.rdf.model.Property p) Answer the double value of property p on resource x or null if there isn't one.
static int	getIntValue(org.apache.jena.rdf.model.Resource x, org.apache.jena.rdf.model.Property p, int ifAbsent) Answer the integer value of property p on resource x, or ifAbsent if there isn't one.
static String	getLabel(org.apache.jena.rdf.model.RDFNode node) Return a label for the given node
static String	getLabel(org.apache.jena.rdf.model.Resource root) Return a label for the given resource
static String	getLabel(org.apache.jena.rdf.model.Resource root, String language) Return a label for the given resource
static String	getLexicalForm(org.apache.jena.rdf.model.RDFNode value) Return the lexical form of a node.
static String	getLocalname(org.apache.jena.rdf.model.Resource r) Return a useful version of the local name for a resource.
static String	getLocalname(String uri) Return a useful version of the local name for a resource.
static Long	getLongValue(org.apache.jena.rdf.model.Resource x, org.apache.jena.rdf.model.Property p) Answer the long value of property p on resource x or null if there isn't one.
static String	getNamespace(org.apache.jena.rdf.model.Resource r) Return a useful version of the namespace resource.
static Number	getNumericValue(org.apache.jena.rdf.model.Resource x, org.apache.jena.rdf.model.Property p)
static org.apache.jena.rdf.model.Resource	getResourceValue(org.apache.jena.rdf.model.Resource subject, org.apache.jena.rdf.model.Property prop) Return the value of a resource on a property as a resource, or null if there isn't a resource value.
static List<org.apache.jena.rdf.model.Resource>	getResourceValues(org.apache.jena.rdf.model.Resource subject, org.apache.jena.rdf.model.Property prop) Return all the resource values of the property on a resource.
static String	getStringValue(org.apache.jena.rdf.model.Resource r, org.apache.jena.rdf.model.Property p) Return one of the values of the property on the resource in string form.
static String	getStringValue(org.apache.jena.rdf.model.Resource r, org.apache.jena.rdf.model.Property p, String defaultValue) Return one of the values of the property on the resource in string form.
static org.apache.jena.rdf.model.Resource	getSubject(org.apache.jena.rdf.model.Model model, org.apache.jena.rdf.model.Property prop, org.apache.jena.rdf.model.RDFNode object) Find the singleton subject of the given property/value pair.
static org.apache.jena.rdf.model.Model	mapNamespace(org.apache.jena.rdf.model.Model model, String originalNS, String replacementNS) Map a namespace used in a model
static String	serlialize(org.apache.jena.rdf.model.RDFNode node) Serialize a (URI or literal) RDFNode to a string which can be later parsed
static void	timestamp(org.apache.jena.rdf.model.Resource resource, org.apache.jena.rdf.model.Property prop) Timestamp a resource using current time

Methods inherited from class java.lang.Object

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

Field Detail

labelProps

public static final org.apache.jena.rdf.model.Property[] labelProps

descriptionProps

public static final org.apache.jena.rdf.model.Property[] descriptionProps

Constructor Detail

RDFUtil

public RDFUtil()

Method Detail

getAPropertyValue

public static org.apache.jena.rdf.model.RDFNode getAPropertyValue(org.apache.jena.rdf.model.Resource root,
                                                                  org.apache.jena.rdf.model.Property[] props)

Return the first available value for the given list of properties

findLangMatchValue

public static String findLangMatchValue(org.apache.jena.rdf.model.Resource root,
                                        String language,
                                        org.apache.jena.rdf.model.Property... props)

Checks the list of properties for one for which we can return a string which either matches the given language or a plain-literal

getLabel

public static String getLabel(org.apache.jena.rdf.model.Resource root)

Return a label for the given resource

getLabel

public static String getLabel(org.apache.jena.rdf.model.Resource root,
                              String language)

Return a label for the given resource

getLabel

public static String getLabel(org.apache.jena.rdf.model.RDFNode node)

Return a label for the given node

getDescription

public static String getDescription(org.apache.jena.rdf.model.Resource root)

Return a description for the given resource

getDescription

public static String getDescription(org.apache.jena.rdf.model.Resource root,
                                    String lang)

Return a description for the given resource

getSubject

public static org.apache.jena.rdf.model.Resource getSubject(org.apache.jena.rdf.model.Model model,
                                                            org.apache.jena.rdf.model.Property prop,
                                                            org.apache.jena.rdf.model.RDFNode object)

Find the singleton subject of the given property/value pair. Return null if there is no match. Return an arbitrary match if there are multiples

getStringValue

public static String getStringValue(org.apache.jena.rdf.model.Resource r,
                                    org.apache.jena.rdf.model.Property p,
                                    String defaultValue)

Return one of the values of the property on the resource in string form. If there are no values return the defaultValue. If the value is not a String but is a literal return it's lexical form. If it is a resource return it's URI.

getStringValue

public static String getStringValue(org.apache.jena.rdf.model.Resource r,
                                    org.apache.jena.rdf.model.Property p)

Return one of the values of the property on the resource in string form. If there are no values return null.

getLexicalForm

public static String getLexicalForm(org.apache.jena.rdf.model.RDFNode value)

Return the lexical form of a node. This is the lexical form of a literal, the URI of a URIResource or the annonID of a bNode.

getResourceValue

public static org.apache.jena.rdf.model.Resource getResourceValue(org.apache.jena.rdf.model.Resource subject,
                                                                  org.apache.jena.rdf.model.Property prop)

Return the value of a resource on a property as a resource, or null if there isn't a resource value.

getResourceValues

public static List<org.apache.jena.rdf.model.Resource> getResourceValues(org.apache.jena.rdf.model.Resource subject,
                                                                         org.apache.jena.rdf.model.Property prop)

Return all the resource values of the property on a resource.

getIntValue

public static int getIntValue(org.apache.jena.rdf.model.Resource x,
                              org.apache.jena.rdf.model.Property p,
                              int ifAbsent)

Answer the integer value of property p on resource x, or ifAbsent if there isn't one.

getLongValue

public static Long getLongValue(org.apache.jena.rdf.model.Resource x,
                                org.apache.jena.rdf.model.Property p)

Answer the long value of property p on resource x or null if there isn't one.

getDoubleValue

public static Double getDoubleValue(org.apache.jena.rdf.model.Resource x,
                                    org.apache.jena.rdf.model.Property p)

Answer the double value of property p on resource x or null if there isn't one.

getNumericValue

public static Number getNumericValue(org.apache.jena.rdf.model.Resource x,
                                     org.apache.jena.rdf.model.Property p)

getBooleanValue

public static boolean getBooleanValue(org.apache.jena.rdf.model.Resource r,
                                      org.apache.jena.rdf.model.Property p,
                                      boolean ifAbsent)

Answer the boolean value of property p on resource r. If there is no p-value, or the p-value is not a literal, return ifAbsent. Otherwise return true if the literal has spelling "true" or "yes", false if it has the spelling "false" or "no", and an unspecified value otherwise.

getLocalname

public static String getLocalname(String uri)

Return a useful version of the local name for a resource. Not restricted to an NCName

getLocalname

public static String getLocalname(org.apache.jena.rdf.model.Resource r)

Return a useful version of the local name for a resource. Not restricted to an NCName

getNamespace

public static String getNamespace(org.apache.jena.rdf.model.Resource r)

Return a useful version of the namespace resource. Not restricted to treating the localname as an NCName

asRDFNode

public static org.apache.jena.rdf.model.RDFNode asRDFNode(Object val)

Convert an arbitrary value to a RDF node.

• An existing node is returned unchanged
• A string beginning http: is converted to a resource
• A string ending with @lang becomes a lang-tagged literal
• Other strings become plain literals
• All other non-null values are passed to the literal factory
• Null becomes a new bnode

Parameters:

val - Any value

Returns:

val converted to an RDFNode

timestamp

public static void timestamp(org.apache.jena.rdf.model.Resource resource,
                             org.apache.jena.rdf.model.Property prop)

Timestamp a resource using current time

copyProperty

public static void copyProperty(org.apache.jena.rdf.model.Resource src,
                                org.apache.jena.rdf.model.Resource dest,
                                org.apache.jena.rdf.model.Property p)

Copy all values of the given property from the source to the dest resource

copyProperty

public static void copyProperty(org.apache.jena.rdf.model.Resource src,
                                org.apache.jena.rdf.model.Resource dest,
                                org.apache.jena.rdf.model.Property p,
                                org.apache.jena.rdf.model.Property newp)

Copy all values of p from src to values of newp on dest.

fromDateTime

public static org.apache.jena.rdf.model.Literal fromDateTime(long date)

Create a datetime literal representing the given Date (in unix ms since epoch style)

asTimestamp

public static long asTimestamp(org.apache.jena.rdf.model.RDFNode n)

Convert a datetime literal to a unix style date stamp

findRoot

public static org.apache.jena.rdf.model.Resource findRoot(org.apache.jena.rdf.model.Model m)

Return the root resource of a model (or the first root we find if there are multiple). Return null there is no root.

findRoots

public static List<org.apache.jena.rdf.model.Resource> findRoots(org.apache.jena.rdf.model.Model m)

Return all the root resources of a model

allPropertiesOf

public static Set<org.apache.jena.rdf.model.Property> allPropertiesOf(org.apache.jena.rdf.model.Resource r)

Return a collection of all the distinct properties of the given resource

asProperty

public static org.apache.jena.rdf.model.Property asProperty(org.apache.jena.rdf.model.Resource r)

Create a property with the same URI as the given resource

allResourceValues

public static List<org.apache.jena.rdf.model.Resource> allResourceValues(org.apache.jena.rdf.model.Resource resource,
                                                                         org.apache.jena.rdf.model.Property p)

Return a list of all the resource-values of the property on the resource

serlialize

public static String serlialize(org.apache.jena.rdf.model.RDFNode node)

Serialize a (URI or literal) RDFNode to a string which can be later parsed

deserialize

public static org.apache.jena.rdf.model.RDFNode deserialize(String ser)

Decode a serlialized RDFNode, not associated with any useful model

mapNamespace

public static org.apache.jena.rdf.model.Model mapNamespace(org.apache.jena.rdf.model.Model model,
                                                           String originalNS,
                                                           String replacementNS)

Map a namespace used in a model