org.apache.james.mime4j.util

Class CharsetUtil

java.lang.Object

org.apache.james.mime4j.util.CharsetUtil

public class CharsetUtil
extends java.lang.Object

Utility class for working with character sets.

Field Summary

Fields

Modifier and Type	Field and Description
static int	CR US-ASCII CR, carriage return (13)
static java.lang.String	CRLF carriage return - line feed sequence
static java.nio.charset.Charset	DEFAULT_CHARSET
static int	HT US-ASCII HT, horizontal-tab (9)
static java.nio.charset.Charset	ISO_8859_1
static int	LF US-ASCII LF, line feed (10)
static int	SP US-ASCII SP, space (32)
static java.nio.charset.Charset	US_ASCII
static java.nio.charset.Charset	UTF_8

Constructor Summary

Constructors

Constructor and Description
CharsetUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	isASCII(char ch) Returns true if the specified character falls into the US ASCII character set (Unicode range 0000 to 007f).
static boolean	isASCII(java.lang.String s) Returns true if the specified string consists entirely of US ASCII characters.
static boolean	isWhitespace(char ch) Returns true if the specified character is a whitespace character (CR, LF, SP or HT).
static boolean	isWhitespace(java.lang.String s) Returns true if the specified string consists entirely of whitespace characters.
static java.nio.charset.Charset	lookup(java.lang.String name) Returns a Charset instance if character set with the given name is recognized and supported by Java runtime.

Methods inherited from class java.lang.Object

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

Field Detail

CRLF

public static final java.lang.String CRLF

carriage return - line feed sequence

See Also:

Constant Field Values

CR

public static final int CR

US-ASCII CR, carriage return (13)

See Also:

Constant Field Values

LF

public static final int LF

US-ASCII LF, line feed (10)

See Also:

Constant Field Values

SP

public static final int SP

US-ASCII SP, space (32)

See Also:

Constant Field Values

HT

public static final int HT

US-ASCII HT, horizontal-tab (9)

See Also:

Constant Field Values

US_ASCII

public static final java.nio.charset.Charset US_ASCII

ISO_8859_1

public static final java.nio.charset.Charset ISO_8859_1

UTF_8

public static final java.nio.charset.Charset UTF_8

DEFAULT_CHARSET

public static final java.nio.charset.Charset DEFAULT_CHARSET

Constructor Detail

CharsetUtil

public CharsetUtil()

Method Detail

isASCII

public static boolean isASCII(char ch)

Returns true if the specified character falls into the US ASCII character set (Unicode range 0000 to 007f).

Parameters:

ch - character to test.

Returns:

true if the specified character falls into the US ASCII character set, false otherwise.

isASCII

public static boolean isASCII(java.lang.String s)

Returns true if the specified string consists entirely of US ASCII characters.

Parameters:

s - string to test.

Returns:

true if the specified string consists entirely of US ASCII characters, false otherwise.

isWhitespace

public static boolean isWhitespace(char ch)

Returns true if the specified character is a whitespace character (CR, LF, SP or HT).

Parameters:

ch - character to test.

Returns:

true if the specified character is a whitespace character, false otherwise.

isWhitespace

public static boolean isWhitespace(java.lang.String s)

Returns true if the specified string consists entirely of whitespace characters.

Parameters:

s - string to test.

Returns:

true if the specified string consists entirely of whitespace characters, false otherwise.

lookup

public static java.nio.charset.Charset lookup(java.lang.String name)

Returns a Charset instance if character set with the given name is recognized and supported by Java runtime. Returns null otherwise.

This method is a wrapper around Charset.forName(String) method that catches IllegalCharsetNameException and UnsupportedCharsetException and returns null.