Module org.apache.jena.core

Package org.apache.jena.rdf.model.impl

Class Util

java.lang.Object

org.apache.jena.rdf.model.impl.Util

public class Util
extends Object

Some utility functions.

Constructor Summary

Constructors

Constructor	Description
Util()

Method Summary

Modifier and Type	Method	Description
static boolean	isLangString(Node n)	A Node is a language string if it has a language tag.
static boolean	isLangString(Literal lit)	Return true if the literal has a language tag.
static boolean	isSimpleString(Node n)	A Node is a simple string if: (RDF 1.0) No datatype and no language tag.
static boolean	isSimpleString(Literal lit)	Return true if the literal is a simple string.
static boolean	notNameChar(char ch)	answer true iff this is not a legal NCName character, ie, is a possible split-point start.
static String	replace(String s, String oldString, String newString)
static int	splitNamespaceXML(String uri)	Given an absolute URI, determine the split point between the namespace part and the localname part.
static String	substituteEntitiesInElementContent(String s)	Answer s modified to replace <, >, and & by their corresponding entity references.
static String	substituteEntitiesInEntityValue(String s)
static String	substituteStandardEntities(String s)

Methods inherited from class java.lang.Object

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

Constructor Details

Util

public Util()

Method Details

splitNamespaceXML

public static int splitNamespaceXML(String uri)

Given an absolute URI, determine the split point between the namespace part and the localname part. If there is no valid localname part then the length of the string is returned. The algorithm tries to find the longest NCName at the end of the uri, not immediately preceeded by the first colon in the string.

This operation follows XML QName rules which are more complicated than needed for Turtle and TriG. For example, QName can't start with a digit.

Parameters:

uri -

Returns:

the index of the first character of the localname

See Also:

• SplitIRI

notNameChar

public static boolean notNameChar(char ch)

answer true iff this is not a legal NCName character, ie, is a possible split-point start.

substituteStandardEntities

public static String substituteStandardEntities(String s)

substituteEntitiesInEntityValue

public static String substituteEntitiesInEntityValue(String s)

substituteEntitiesInElementContent

public static String substituteEntitiesInElementContent(String s)

Answer s modified to replace <, >, and & by their corresponding entity references.

Implementation note: as a (possibly misguided) performance hack, the obvious cascade of replaceAll calls is replaced by an explicit loop that looks for all three special characters at once.

replace

public static String replace(String s,
 String oldString,
 String newString)

isSimpleString

public static boolean isSimpleString(Node n)

A Node is a simple string if:

• (RDF 1.0) No datatype and no language tag.
• (RDF 1.1) xsd:string

isLangString

public static boolean isLangString(Node n)

A Node is a language string if it has a language tag. (RDF 1.0 and RDF 1.1)

isSimpleString

public static boolean isSimpleString(Literal lit)

Return true if the literal is a simple string.

RDF 1.0 => it is a plain literal, with no language tag

RDF 1.1 => it has datatype xsd:string

isLangString

public static boolean isLangString(Literal lit)

Return true if the literal has a language tag. (RDF 1.0 and RDF 1.1)