Package org.eclipse.rdf4j.rio.helpers

Class NTriplesUtil

java.lang.Object

org.eclipse.rdf4j.rio.helpers.NTriplesUtil

public class NTriplesUtil
extends Object

Utility methods for N-Triples encoding/decoding.

Constructor Summary

Constructors

Constructor	Description
NTriplesUtil()

Method Summary

Modifier and Type	Method	Description
static void	append(BNode bNode, Appendable appendable)	Appends the N-Triples representation of the given BNode to the given Appendable.
static void	append(IRI uri, Appendable appendable)	Appends the N-Triples representation of the given IRI to the given Appendable.
static void	append(IRI uri, Appendable appendable, boolean escapeUnicode)	Appends the N-Triples representation of the given IRI to the given Appendable.
static void	append(Literal lit, Appendable appendable)	Appends the N-Triples representation of the given Literal to the given Appendable.
static void	append(Literal lit, Appendable appendable, boolean xsdStringToPlainLiteral, boolean escapeUnicode)	Appends the N-Triples representation of the given Literal to the given Appendable, optionally ignoring the xsd:string datatype as it is implied for RDF-1.1.
static void	append(Resource resource, Appendable appendable)	Appends the N-Triples representation of the given Resource to the given Appendable.
static void	append(Triple triple, Appendable appendable)	Appends the N-Triples (non-standard) representation of the given Triple to the given Appendable.
static void	append(Value value, Appendable appendable)	Appends the N-Triples representation of the given Value to the given Appendable.
static void	append(Value value, Appendable appendable, boolean xsdStringToPlainLiteral, boolean escapeUnicode)	Appends the N-Triples representation of the given Value to the given Appendable, optionally not serializing the datatype a Literal with the xsd:string datatype as it is implied for RDF-1.1.
static String	escapeString(String label)	Escapes a Unicode string to an all-ASCII character sequence.Any special characters are escaped using backslashes ( " becomes \", etc.), and non-ascii/non-printable characters are escaped using Unicode escapes ( \uxxxx and \Uxxxxxxxx).
static void	escapeString(String label, Appendable appendable)	Escapes a Unicode string to an all-ASCII character sequence.
static void	escapeString(String label, Appendable appendable, boolean escapeUnicode)	Escapes a Unicode string to an N-Triples compatible character sequence.Any special characters are escaped using backslashes (" becomes \", etc.), and non-ascii/non-printable characters are escaped using Unicode escapes (\uxxxx and \Uxxxxxxxx) if the option is selected.
static boolean	isDot(int c)	Checks whether the supplied character is Dot '.'.
static boolean	isLetter(int c)	Deprecated. use ASCIIUtil.isLetter(int)
static boolean	isLetterOrNumber(int c)	Deprecated. use ASCIIUtil.isLetterOrNumber(int)
static boolean	isLiberalCharactersButNotDot(int c)	Checks whether the supplied character is in list of liberal characters according to the N-Triples specification except Dot.
static boolean	isNumber(int c)	Deprecated. use ASCIIUtil.isNumber(int)
static boolean	isUnderscore(int c)	Checks whether the supplied character is Underscore.
static boolean	isValidCharacterForBNodeLabel(int c)	Checks whether the supplied character is valid character as per N-Triples specification.
static BNode	parseBNode(String nTriplesBNode, ValueFactory valueFactory)	Parses an N-Triples bNode, creates an object for it using the supplied ValueFactory and returns this object.
static Literal	parseLiteral(String nTriplesLiteral, ValueFactory valueFactory)	Parses an N-Triples literal, creates an object for it using the supplied ValueFactory and returns this object.
static Resource	parseResource(String nTriplesResource, ValueFactory valueFactory)	Parses an N-Triples resource, creates an object for it using the supplied ValueFactory and returns this object.
static Triple	parseTriple(String nTriplesTriple, ValueFactory valueFactory)	Parses an RDF-star triple (non-standard N-Triples), creates an object for it using the supplied ValueFactory and returns this object.
static IRI	parseURI(String nTriplesURI, ValueFactory valueFactory)	Parses an N-Triples URI, creates an object for it using the supplied ValueFactory and returns this object.
static Value	parseValue(String nTriplesValue, ValueFactory valueFactory)	Parses an N-Triples value, creates an object for it using the supplied ValueFactory and returns this object.
static String	toHexString(int decimal, int stringLength)	Converts a decimal value to a hexadecimal string representation of the specified length.
static String	toNTriplesString(BNode bNode)	Creates an N-Triples string for the supplied blank node.
static String	toNTriplesString(IRI uri)	Creates an N-Triples string for the supplied URI.
static String	toNTriplesString(Literal lit)	Creates an N-Triples string for the supplied literal.
static String	toNTriplesString(Literal lit, boolean xsdStringToPlainLiteral)	Creates an N-Triples string for the supplied literal, optionally ignoring the xsd:string datatype as it is implied for RDF-1.1.
static String	toNTriplesString(Resource resource)	Creates an N-Triples string for the supplied resource.
static String	toNTriplesString(Triple triple)	Creates an N-Triples (non-standard) string for the supplied RDF-star triple.
static String	toNTriplesString(Value value)	Creates an N-Triples string for the supplied value.
static String	toNTriplesString(Value value, boolean xsdStringToPlainLiteral)	Creates an N-Triples string for the supplied value.If the supplied value is a Literal, it optionally ignores the xsd:string datatype, since this datatype is implicit in RDF-1.1.
static String	unescapeString(String s)	Unescapes an escaped Unicode string.

Methods inherited from class java.lang.Object

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

Constructor Details

NTriplesUtil

public NTriplesUtil()

Method Details

parseValue

public static Value parseValue(String nTriplesValue,
 ValueFactory valueFactory)
                        throws IllegalArgumentException

Parses an N-Triples value, creates an object for it using the supplied ValueFactory and returns this object.

Parameters:

nTriplesValue - The N-Triples value to parse.

valueFactory - The ValueFactory to use for creating the object.

Returns:

An object representing the parsed value.

Throws:

IllegalArgumentException - If the supplied value could not be parsed correctly.

parseResource

public static Resource parseResource(String nTriplesResource,
 ValueFactory valueFactory)
                              throws IllegalArgumentException

Parses an N-Triples resource, creates an object for it using the supplied ValueFactory and returns this object.

Parameters:

nTriplesResource - The N-Triples resource to parse.

valueFactory - The ValueFactory to use for creating the object.

Returns:

An object representing the parsed resource.

Throws:

IllegalArgumentException - If the supplied resource could not be parsed correctly.

parseURI

public static IRI parseURI(String nTriplesURI,
 ValueFactory valueFactory)
                    throws IllegalArgumentException

Parses an N-Triples URI, creates an object for it using the supplied ValueFactory and returns this object.

Parameters:

nTriplesURI - The N-Triples URI to parse.

valueFactory - The ValueFactory to use for creating the object.

Returns:

An object representing the parsed URI.

Throws:

IllegalArgumentException - If the supplied URI could not be parsed correctly.

parseBNode

public static BNode parseBNode(String nTriplesBNode,
 ValueFactory valueFactory)
                        throws IllegalArgumentException

Parses an N-Triples bNode, creates an object for it using the supplied ValueFactory and returns this object.

Parameters:

nTriplesBNode - The N-Triples bNode to parse.

valueFactory - The ValueFactory to use for creating the object.

Returns:

An object representing the parsed bNode.

Throws:

IllegalArgumentException - If the supplied bNode could not be parsed correctly.

parseLiteral

public static Literal parseLiteral(String nTriplesLiteral,
 ValueFactory valueFactory)
                            throws IllegalArgumentException

Parses an N-Triples literal, creates an object for it using the supplied ValueFactory and returns this object.

Parameters:

nTriplesLiteral - The N-Triples literal to parse.

valueFactory - The ValueFactory to use for creating the object.

Returns:

An object representing the parsed literal.

Throws:

IllegalArgumentException - If the supplied literal could not be parsed correctly.

parseTriple

public static Triple parseTriple(String nTriplesTriple,
 ValueFactory valueFactory)

Parses an RDF-star triple (non-standard N-Triples), creates an object for it using the supplied ValueFactory and returns this object.

Parameters:

nTriplesTriple - The RDF-star triple to parse.

valueFactory - The ValueFactory to use for creating the object.

Returns:

An object representing the parsed triple.

Throws:

IllegalArgumentException - If the supplied triple could not be parsed correctly.

toNTriplesString

public static String toNTriplesString(Value value)

Creates an N-Triples string for the supplied value.

Parameters:

value -

Returns:

string

toNTriplesString

public static String toNTriplesString(Value value,
 boolean xsdStringToPlainLiteral)

Creates an N-Triples string for the supplied value.If the supplied value is a Literal, it optionally ignores the xsd:string datatype, since this datatype is implicit in RDF-1.1.

Parameters:

value - The value to write.

xsdStringToPlainLiteral - True to omit serialising the xsd:string datatype and false to always serialise the datatype for literals.

Returns:

string

append

public static void append(Value value,
 Appendable appendable)
                   throws IOException

Appends the N-Triples representation of the given Value to the given Appendable.

Parameters:

value - The value to write.

appendable - The object to append to.

Throws:

IOException

append

public static void append(Value value,
 Appendable appendable,
 boolean xsdStringToPlainLiteral,
 boolean escapeUnicode)
                   throws IOException

Appends the N-Triples representation of the given Value to the given Appendable, optionally not serializing the datatype a Literal with the xsd:string datatype as it is implied for RDF-1.1.

Parameters:

value - The value to write.

appendable - The object to append to.

xsdStringToPlainLiteral - True to omit serializing the xsd:string datatype and false to always serialize the datatype for literals.

escapeUnicode -

Throws:

IOException

toNTriplesString

public static String toNTriplesString(Resource resource)

Creates an N-Triples string for the supplied resource.

Parameters:

resource -

Returns:

string

append

public static void append(Resource resource,
 Appendable appendable)
                   throws IOException

Appends the N-Triples representation of the given Resource to the given Appendable.

Parameters:

resource - The resource to write.

appendable - The object to append to.

Throws:

IOException

toNTriplesString

public static String toNTriplesString(IRI uri)

Creates an N-Triples string for the supplied URI.

Parameters:

uri -

Returns:

string

append

public static void append(IRI uri,
 Appendable appendable)
                   throws IOException

Appends the N-Triples representation of the given IRI to the given Appendable.

Parameters:

uri - The IRI to write.

appendable - The object to append to.

Throws:

IOException

append

public static void append(IRI uri,
 Appendable appendable,
 boolean escapeUnicode)
                   throws IOException

Appends the N-Triples representation of the given IRI to the given Appendable.

Parameters:

uri -

appendable -

escapeUnicode -

Throws:

IOException

toNTriplesString

public static String toNTriplesString(BNode bNode)

Creates an N-Triples string for the supplied blank node.

Parameters:

bNode -

Returns:

string

append

public static void append(BNode bNode,
 Appendable appendable)
                   throws IOException

Appends the N-Triples representation of the given BNode to the given Appendable.

Parameters:

bNode -

appendable -

Throws:

IOException

toNTriplesString

public static String toNTriplesString(Literal lit)

Creates an N-Triples string for the supplied literal.

Parameters:

lit -

Returns:

string

toNTriplesString

public static String toNTriplesString(Literal lit,
 boolean xsdStringToPlainLiteral)

Creates an N-Triples string for the supplied literal, optionally ignoring the xsd:string datatype as it is implied for RDF-1.1.

Parameters:

lit - The literal to write.

xsdStringToPlainLiteral - True to omit serializing the xsd:string datatype and false to always serialize the datatype for literals.

Returns:

String

append

public static void append(Literal lit,
 Appendable appendable)
                   throws IOException

Appends the N-Triples representation of the given Literal to the given Appendable.

Parameters:

lit -

appendable -

Throws:

IOException

append

public static void append(Literal lit,
 Appendable appendable,
 boolean xsdStringToPlainLiteral,
 boolean escapeUnicode)
                   throws IOException

Appends the N-Triples representation of the given Literal to the given Appendable, optionally ignoring the xsd:string datatype as it is implied for RDF-1.1.

Parameters:

lit - The literal to write.

appendable - The object to append to.

xsdStringToPlainLiteral - True to omit serializing the xsd:string datatype and false to always serialize the datatype for literals.

escapeUnicode - True to escape non-ascii/non-printable characters using Unicode escapes (\uxxxx and \Uxxxxxxxx), false to print without escaping.

Throws:

IOException

toNTriplesString

public static String toNTriplesString(Triple triple)

Creates an N-Triples (non-standard) string for the supplied RDF-star triple.

Parameters:

triple -

Returns:

string

append

public static void append(Triple triple,
 Appendable appendable)
                   throws IOException

Appends the N-Triples (non-standard) representation of the given Triple to the given Appendable.

Parameters:

triple -

appendable -

Throws:

IOException

isLetterOrNumber

@Deprecated
public static boolean isLetterOrNumber(int c)

Deprecated.

use ASCIIUtil.isLetterOrNumber(int)

Checks whether the supplied character is a letter or number according to the N-Triples specification.

Parameters:

c -

Returns:

true if it is a letter or a number

See Also:

• isLetter(int)
• isNumber(int)

isLetter

@Deprecated
public static boolean isLetter(int c)

Deprecated.

use ASCIIUtil.isLetter(int)

Checks whether the supplied character is a letter according to the N-Triples specification.N-Triples letters are A - Z and a - z.

Parameters:

c -

Returns:

true if c is an ascii leter

isNumber

@Deprecated
public static boolean isNumber(int c)

Deprecated.

use ASCIIUtil.isNumber(int)

Checks whether the supplied character is a number according to the N-Triples specification.N-Triples numbers are 0 - 9.

Parameters:

c -

Returns:

true if the character is a number

isValidCharacterForBNodeLabel

public static boolean isValidCharacterForBNodeLabel(int c)

Checks whether the supplied character is valid character as per N-Triples specification.

Parameters:

c -

Returns:

true if valid

See Also:

• https://www.w3.org/TR/n-triples/#BNodes

isLiberalCharactersButNotDot

public static boolean isLiberalCharactersButNotDot(int c)

Checks whether the supplied character is in list of liberal characters according to the N-Triples specification except Dot.

Parameters:

c -

Returns:

true if valid

isUnderscore

public static boolean isUnderscore(int c)

Checks whether the supplied character is Underscore.

Parameters:

c -

Returns:

true if it is an underscore

isDot

public static boolean isDot(int c)

Checks whether the supplied character is Dot '.'.

Parameters:

c -

Returns:

true if it is a dot

escapeString

public static String escapeString(String label)

Escapes a Unicode string to an all-ASCII character sequence.Any special characters are escaped using backslashes ( " becomes \", etc.), and non-ascii/non-printable characters are escaped using Unicode escapes ( \uxxxx and \Uxxxxxxxx).

Parameters:

label -

Returns:

an escaped string (unicode to ascii plus codepoints).

escapeString

public static void escapeString(String label,
 Appendable appendable)
                         throws IOException

Escapes a Unicode string to an all-ASCII character sequence. Any special characters are escaped using backslashes ( " becomes \", etc.), and non-ascii/non-printable characters are escaped using Unicode escapes ( \uxxxx and \Uxxxxxxxx).

Parameters:

label -

appendable -

Throws:

IOException

escapeString

public static void escapeString(String label,
 Appendable appendable,
 boolean escapeUnicode)
                         throws IOException

Escapes a Unicode string to an N-Triples compatible character sequence.Any special characters are escaped using backslashes (" becomes \", etc.), and non-ascii/non-printable characters are escaped using Unicode escapes (\uxxxx and \Uxxxxxxxx) if the option is selected.

Parameters:

label -

appendable -

escapeUnicode -

Throws:

IOException

unescapeString

public static String unescapeString(String s)

Unescapes an escaped Unicode string. Any Unicode sequences ( \uxxxx and \Uxxxxxxxx) are restored to the value indicated by the hexadecimal argument and any backslash-escapes ( \", \\, etc.) are decoded to their original form.

Parameters:

s - An escaped Unicode string.

Returns:

The unescaped string.

Throws:

IllegalArgumentException - If the supplied string is not a correctly escaped N-Triples string.

toHexString

public static String toHexString(int decimal,
 int stringLength)

Converts a decimal value to a hexadecimal string representation of the specified length.

Parameters:

decimal - A decimal value.

stringLength - The length of the resulting string.

Returns:

padded string