com.apicatalog.rdf.nquads

Class NQuadsAlphabet

java.lang.Object

com.apicatalog.rdf.nquads.NQuadsAlphabet

public class NQuadsAlphabet
extends Object

Utility class defining character predicates and escaping rules for N-Quads syntax. This class provides predefined IntPredicate instances to identify specific character sets used in N-Quads processing, as well as a method to escape special characters in string values.

Character predicates include:

• ASCII_ALPHA - Matches ASCII alphabetic characters (A-Z, a-z).
• ASCII_DIGIT - Matches ASCII digits (0-9).
• ASCII_ALPHA_NUM - Matches alphanumeric characters.
• WHITESPACE - Matches whitespace characters (tab, space).
• EOL - Matches end-of-line characters (LF, CR).
• HEX - Matches hexadecimal digits (0-9, A-F, a-f).
• PN_CHARS_BASE - Matches base name characters as per RDF standard.
• PN_CHARS_U - Matches base characters plus underscore and colon.
• PN_CHARS - Matches all valid name characters.

The escape(String) method provides a way to escape special characters in string values according to N-Quads formatting rules.

This class is not meant to be instantiated.

See Also:

RDF 1.1 N-Quads

Field Summary

Fields

Modifier and Type	Field and Description
static IntPredicate	ASCII_ALPHA
static IntPredicate	ASCII_ALPHA_NUM
static IntPredicate	ASCII_DIGIT
static String	DIR_LANG_STRING
static IntPredicate	EOL
static IntPredicate	HEX
static String	I18N_BASE
static String	LANG_STRING
static IntPredicate	PN_CHARS
static IntPredicate	PN_CHARS_BASE
static IntPredicate	PN_CHARS_U
static IntPredicate	WHITESPACE
static String	XSD_STRING

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NQuadsAlphabet()

Method Summary

Modifier and Type	Method and Description
static String	escape(String value) Escapes special characters in the given string according to N-Quads syntax.

Methods inherited from class java.lang.Object

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

Field Detail

I18N_BASE

public static final String I18N_BASE

See Also:

Constant Field Values

LANG_STRING

public static final String LANG_STRING

See Also:

Constant Field Values

DIR_LANG_STRING

public static final String DIR_LANG_STRING

See Also:

Constant Field Values

XSD_STRING

public static final String XSD_STRING

See Also:

Constant Field Values

ASCII_ALPHA

public static final IntPredicate ASCII_ALPHA

ASCII_DIGIT

public static final IntPredicate ASCII_DIGIT

ASCII_ALPHA_NUM

public static final IntPredicate ASCII_ALPHA_NUM

WHITESPACE

public static final IntPredicate WHITESPACE

EOL

public static final IntPredicate EOL

HEX

public static final IntPredicate HEX

PN_CHARS_BASE

public static final IntPredicate PN_CHARS_BASE

PN_CHARS_U

public static final IntPredicate PN_CHARS_U

PN_CHARS

public static final IntPredicate PN_CHARS

Constructor Detail

NQuadsAlphabet

protected NQuadsAlphabet()

Method Detail

escape

public static final String escape(String value)

Escapes special characters in the given string according to N-Quads syntax. This method replaces control characters, backslashes, and quotes with their corresponding escape sequences.

Parameters:

value - the string to be escaped

Returns:

the escaped string with special characters replaced