org.rdfhdt.hdt.util.string

Class UnicodeEscape

java.lang.Object

org.rdfhdt.hdt.util.string.UnicodeEscape

public class UnicodeEscape
extends Object

Method Summary

Modifier and Type	Method and Description
static String	escapeString(String label) Escapes a Unicode string to an all-ASCII character sequence.
static void	escapeString(String label, Appendable appendable) Escapes a Unicode string to an all-ASCII character sequence.
static boolean	isLetter(int c) Checks whether the supplied character is a letter according to the N-Triples specification.
static boolean	isLetterOrNumber(int c) Checks whether the supplied character is a letter or number according to the N-Triples specification.
static boolean	isNumber(int c) Checks whether the supplied character is a number according to the N-Triples specification.
static String	toHexString(int decimal, int stringLength) Converts a decimal value to a hexadecimal string representation of the specified length.
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

Method Detail

isLetterOrNumber

public static boolean isLetterOrNumber(int c)

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

See Also:

isLetter(int), isNumber(int)

isLetter

public static boolean isLetter(int c)

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

isNumber

public static boolean isNumber(int c)

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

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).

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).

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.