com.epimorphics.util

Class RDFUtils

java.lang.Object

com.epimorphics.util.RDFUtils

public class RDFUtils
extends Object

Random collection of RDF Utilities that should really be in Jena.

Version:

$Revision: $

Author:

Dave Reynolds

Field Summary

Fields

Modifier and Type	Field and Description
static com.hp.hpl.jena.shared.PrefixMapping	noPrefixes An immutable empty prefix mapping.

Constructor Summary

Constructors

Constructor and Description
RDFUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static List<String>	allMatches(Pattern regex, String target) Find all matches for the given regex within a string.
static boolean	getBooleanValue(com.hp.hpl.jena.rdf.model.Resource r, com.hp.hpl.jena.rdf.model.Property p, boolean ifAbsent) Return the boolean value of property p on resource r.
static int	getIntValue(com.hp.hpl.jena.rdf.model.Resource x, com.hp.hpl.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	getLexicalForm(com.hp.hpl.jena.rdf.model.RDFNode value) Return the lexical form of a node.
static String	getNameFor(com.hp.hpl.jena.rdf.model.Resource r) Find a name to give a resource
static Boolean	getOptionalBooleanValue(com.hp.hpl.jena.rdf.model.Resource x, com.hp.hpl.jena.rdf.model.Property p, Boolean ifAbsent) Return an optional boolean value of a property.
static com.hp.hpl.jena.rdf.model.Resource	getResourceValue(com.hp.hpl.jena.rdf.model.Resource subject, com.hp.hpl.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 String	getStringValue(com.hp.hpl.jena.rdf.model.Resource r, com.hp.hpl.jena.rdf.model.Property p) Return one of the values of the property on the resource in string form.
static String	getStringValue(com.hp.hpl.jena.rdf.model.Resource r, com.hp.hpl.jena.rdf.model.Property p, String defaultValue) Return one of the values of the property on the resource in string form.

Methods inherited from class java.lang.Object

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

Field Detail

noPrefixes

public static final com.hp.hpl.jena.shared.PrefixMapping noPrefixes

An immutable empty prefix mapping.

Constructor Detail

RDFUtils

public RDFUtils()

Method Detail

getStringValue

public static String getStringValue(com.hp.hpl.jena.rdf.model.Resource r,
                    com.hp.hpl.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(com.hp.hpl.jena.rdf.model.Resource r,
                    com.hp.hpl.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(com.hp.hpl.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 com.hp.hpl.jena.rdf.model.Resource getResourceValue(com.hp.hpl.jena.rdf.model.Resource subject,
                                                  com.hp.hpl.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.

getNameFor

public static String getNameFor(com.hp.hpl.jena.rdf.model.Resource r)

Find a name to give a resource

allMatches

public static List<String> allMatches(Pattern regex,
                      String target)

Find all matches for the given regex within a string. OK this is not an *RDF* util, so sue me.

getIntValue

public static int getIntValue(com.hp.hpl.jena.rdf.model.Resource x,
              com.hp.hpl.jena.rdf.model.Property p,
              int ifAbsent)

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

getBooleanValue

public static boolean getBooleanValue(com.hp.hpl.jena.rdf.model.Resource r,
                      com.hp.hpl.jena.rdf.model.Property p,
                      boolean ifAbsent)

Return 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.

getOptionalBooleanValue

public static Boolean getOptionalBooleanValue(com.hp.hpl.jena.rdf.model.Resource x,
                              com.hp.hpl.jena.rdf.model.Property p,
                              Boolean ifAbsent)

Return an optional boolean value of a property. If there is no p-value, or the p-value isn't a literal with spelling "true", "false", "yes", "no", or "optional", return the ifAbsent value. Otherwise return null for optional, TRUE for true/yes, or FALSE for false/no.