Package org.eclipse.rdf4j.rio.turtle

Class TurtleUtil

java.lang.Object

org.eclipse.rdf4j.rio.turtle.TurtleUtil

public class TurtleUtil
extends Object

Utility methods for Turtle encoding/decoding.

See Also:

• Turtle: Terse RDF Triple Language

Field Summary

Fields

Modifier and Type	Field	Description
static final char[]	LOCAL_ESCAPED_CHARS

Constructor Summary

Constructors

Constructor	Description
TurtleUtil()

Method Summary

Modifier and Type	Method	Description
static String	decodeString(String s)	Decodes an encoded Turtle string.
static String	encodeLongString(String s)	Encodes the supplied string for inclusion as a long string in a Turtle document.
static String	encodeString(String s)	Encodes the supplied string for inclusion as a 'normal' string in a Turtle document.
static String	encodeURIString(String s)	Deprecated.
static int	findURISplitIndex(String uri)	Tries to find an index where the supplied URI can be split into a namespace and a local name that comply with the serialization constraints of the Turtle format.
static boolean	isBLANK_NODE_LABEL_Char(int codePoint)	Check if the supplied code point represents a valid blank node label character.
static boolean	isBLANK_NODE_LABEL_EndChar(int codePoint)	Check if the supplied code point represents a valid blank node label end character.
static boolean	isBLANK_NODE_LABEL_StartChar(int codePoint)	Check if the supplied code point represents a valid start character for a blank node label.
static boolean	isLanguageChar(int codePoint)	Check if the supplied code point represents a valid language tag character.
static boolean	isLanguageStartChar(int codePoint)	Check if the supplied code point represents a valid language tag start character.
static boolean	isLocalEscapedChar(int codePoint)	Check if the supplied code point represents a valid local escaped character.
static boolean	isNameChar(int codePoint)	Check if the supplied code point represents a valid name character.
static boolean	isNameEndChar(int codePoint)	Check if the supplied code point represents a valid name end character.
static boolean	isNameStartChar(int codePoint)	Check if the supplied code point represents a valid name start character.
static boolean	isPERCENT(String name)
static boolean	isPLX_INTERNAL(String name)
static boolean	isPLX_START(String name)
static boolean	isPN_CHARS(int codePoint)	Check if the supplied code point represents a valid prefixed name character.
static boolean	isPN_CHARS_BASE(int codePoint)	Check if the supplied code point represents a valid prefixed name base character.
static boolean	isPN_CHARS_U(int codePoint)	Check if the supplied code point represents either a valid prefixed name base character or an underscore.
static boolean	isPN_LOCAL(String name)
static boolean	isPN_LOCAL_ESC(String name)
static boolean	isPN_PREFIX(String prefix)	Checks if the supplied prefix string is a valid Turtle namespace prefix.
static boolean	isPrefixChar(int codePoint)	Check if the supplied code point represents a valid prefix character.
static boolean	isPrefixStartChar(int codePoint)	Check if the supplied code point represents a valid prefixed name start character.
static boolean	isValidPrefixedName(String s)
static boolean	isWhitespace(int codePoint)	Check if the supplied code point represents a whitespace character

Methods inherited from class java.lang.Object

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

Field Details

LOCAL_ESCAPED_CHARS

public static final char[] LOCAL_ESCAPED_CHARS

Constructor Details

TurtleUtil

public TurtleUtil()

Method Details

findURISplitIndex

public static int findURISplitIndex(String uri)

Tries to find an index where the supplied URI can be split into a namespace and a local name that comply with the serialization constraints of the Turtle format.

Parameters:

uri - The URI to split.

Returns:

The index where the supplied URI can be split, or -1 if the URI cannot be split.

isWhitespace

public static boolean isWhitespace(int codePoint)

Check if the supplied code point represents a whitespace character

Parameters:

codePoint - a Unicode code point

Returns:

true if the supplied code point represents a whitespace character, false otherwise.

isPN_CHARS_BASE

public static boolean isPN_CHARS_BASE(int codePoint)

Check if the supplied code point represents a valid prefixed name base character.

From Turtle Spec:

http://www.w3.org/TR/turtle/#grammar-production-PN_CHARS_BASE

[163s] PN_CHARS_BASE ::= [A-Z] | [a-z] | [#x00C0-#x00D6] | [#x00D8-#x00F6] | [#x00F8-#x02FF] | [#x0370-#x037D] | [#x037F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]

isPN_CHARS_U

public static boolean isPN_CHARS_U(int codePoint)

Check if the supplied code point represents either a valid prefixed name base character or an underscore.

From Turtle Spec:

http://www.w3.org/TR/turtle/#grammar-production-PN_CHARS_U

[164s] PN_CHARS_U ::= PN_CHARS_BASE | '_'

isPN_CHARS

public static boolean isPN_CHARS(int codePoint)

Check if the supplied code point represents a valid prefixed name character.

From Turtle Spec:

http://www.w3.org/TR/turtle/#grammar-production-PN_CHARS

[166s] PN_CHARS ::= PN_CHARS_U | '-' | [0-9] | #x00B7 | [#x0300-#x036F] | [#x203F-#x2040]

isPrefixStartChar

public static boolean isPrefixStartChar(int codePoint)

Check if the supplied code point represents a valid prefixed name start character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid prefixed name start char, false otherwise.

isBLANK_NODE_LABEL_StartChar

public static boolean isBLANK_NODE_LABEL_StartChar(int codePoint)

Check if the supplied code point represents a valid start character for a blank node label.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid blank node label start char, false otherwise.

isBLANK_NODE_LABEL_Char

public static boolean isBLANK_NODE_LABEL_Char(int codePoint)

Check if the supplied code point represents a valid blank node label character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid blank node label char, false otherwise.

isBLANK_NODE_LABEL_EndChar

public static boolean isBLANK_NODE_LABEL_EndChar(int codePoint)

Check if the supplied code point represents a valid blank node label end character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid blank node label end char, false otherwise.

isNameStartChar

public static boolean isNameStartChar(int codePoint)

Check if the supplied code point represents a valid name start character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid name start char, false otherwise.

isNameChar

public static boolean isNameChar(int codePoint)

Check if the supplied code point represents a valid name character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid name char, false otherwise.

isNameEndChar

public static boolean isNameEndChar(int codePoint)

Check if the supplied code point represents a valid name end character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid name end char, false otherwise.

isLocalEscapedChar

public static boolean isLocalEscapedChar(int codePoint)

Check if the supplied code point represents a valid local escaped character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid local escaped char, false otherwise.

isPrefixChar

public static boolean isPrefixChar(int codePoint)

Check if the supplied code point represents a valid prefix character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid prefix char, false otherwise.

isLanguageStartChar

public static boolean isLanguageStartChar(int codePoint)

Check if the supplied code point represents a valid language tag start character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid language tag start char, false otherwise.

isLanguageChar

public static boolean isLanguageChar(int codePoint)

Check if the supplied code point represents a valid language tag character.

Parameters:

codePoint - a Unicode code point.

Returns:

true if the supplied code point represents a valid language tag char, false otherwise.

isPN_PREFIX

public static boolean isPN_PREFIX(String prefix)

Checks if the supplied prefix string is a valid Turtle namespace prefix. From Turtle Spec:

http://www.w3.org/TR/turtle/#grammar-production-PN_PREFIX

[167s] PN_PREFIX ::= PN_CHARS_BASE ((PN_CHARS | '.')* PN_CHARS)?

Parameters:

prefix - a prefix string.

Returns:

true if the supplied prefix conforms to Turtle grammar rules

isPLX_START

public static boolean isPLX_START(String name)

isPERCENT

public static boolean isPERCENT(String name)

isPLX_INTERNAL

public static boolean isPLX_INTERNAL(String name)

isPN_LOCAL_ESC

public static boolean isPN_LOCAL_ESC(String name)

isPN_LOCAL

public static boolean isPN_LOCAL(String name)

encodeString

public static String encodeString(String s)

Encodes the supplied string for inclusion as a 'normal' string in a Turtle document.

Parameters:

s -

Returns:

encoded string

encodeLongString

public static String encodeLongString(String s)

Encodes the supplied string for inclusion as a long string in a Turtle document.

Parameters:

s -

Returns:

encoded long string

encodeURIString

@Deprecated
public static String encodeURIString(String s)

Deprecated.

Encodes the supplied string for inclusion as a (relative) URI in a Turtle document.

Parameters:

s -

isValidPrefixedName

public static boolean isValidPrefixedName(String s)

decodeString

public static String decodeString(String s)

Decodes an encoded Turtle string. Any \-escape sequences are substituted with their decoded value.

Parameters:

s - An encoded Turtle string.

Returns:

The unencoded string.

Throws:

IllegalArgumentException - If the supplied string is not a correctly encoded Turtle string.