Package javax.mail.internet

Class MimeUtility

java.lang.Object

javax.mail.internet.MimeUtility

public class MimeUtility
extends java.lang.Object

This is a utility class providing micellaneous MIME-related functionality.

Version:

1.4

Author:

Chris Burdess

Field Summary

Fields

Modifier and Type	Field	Description
static int	ALL

Method Summary

Modifier and Type	Method	Description
static java.io.InputStream	decode(java.io.InputStream is, java.lang.String encoding)	Decodes the given input stream.
static java.lang.String	decodeText(java.lang.String etext)	Decodes headers that are defined as '*text' in RFC 822.
static java.lang.String	decodeWord(java.lang.String text)	Decodes the specified string using the RFC 2047 rules for parsing an "encoded-word".
static java.io.OutputStream	encode(java.io.OutputStream os, java.lang.String encoding)	Encodes the given output stream.
static java.io.OutputStream	encode(java.io.OutputStream os, java.lang.String encoding, java.lang.String filename)	Encodes the given output stream.
static java.lang.String	encodeText(java.lang.String text)	Encodes an RFC 822 "text" token into mail-safe form according to RFC 2047.
static java.lang.String	encodeText(java.lang.String text, java.lang.String charset, java.lang.String encoding)	Encodes an RFC 822 "text" token into mail-safe form according to RFC 2047.
static java.lang.String	encodeWord(java.lang.String text)	Encodes an RFC 822 "word" token into mail-safe form according to RFC 2047.
static java.lang.String	encodeWord(java.lang.String text, java.lang.String charset, java.lang.String encoding)	Encodes an RFC 822 "word" token into mail-safe form according to RFC 2047.
static java.lang.String	fold(int used, java.lang.String s)	Folds the specified string such that each line is no longer than 76 characters, whitespace permitting.
static java.lang.String	getDefaultJavaCharset()	Returns the default Java charset.
static java.lang.String	getEncoding(javax.activation.DataHandler dh)	Returns the Content-Transfer-Encoding that needs to be applied to the given content in order to make it mail safe.
static java.lang.String	getEncoding(javax.activation.DataSource ds)	Returns the Content-Transfer-Encoding that should be applied to the input stream of this data source, to make it mail safe.
static java.lang.String	javaCharset(java.lang.String charset)	Converts a MIME charset name into a Java charset name.
static java.lang.String	mimeCharset(java.lang.String charset)	Converts a Java charset name into a MIME charset name.
static java.lang.String	quote(java.lang.String text, java.lang.String specials)	Quotes the specified word, if it contains any characters from the given "specials" list.
static java.lang.String	unfold(java.lang.String s)	Unfolds a folded header.

Methods inherited from class java.lang.Object

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

Field Detail

ALL

public static final int ALL

See Also:

Constant Field Values

Method Detail

getEncoding

public static java.lang.String getEncoding(javax.activation.DataSource ds)

Returns the Content-Transfer-Encoding that should be applied to the input stream of this data source, to make it mail safe.

• If the primary type of this datasource is "text" and if all the bytes in its input stream are US-ASCII, then the encoding is "7bit". If more than half of the bytes are non-US-ASCII, then the encoding is "base64". If less than half of the bytes are non-US-ASCII, then the encoding is "quoted-printable".
• If the primary type of this datasource is not "text", then if all the bytes of its input stream are US-ASCII, the encoding is "7bit". If there is even one non-US-ASCII character, the encoding is "base64".

Parameters:

ds - the data source

Returns:

"7bit", "quoted-printable" or "base64"

getEncoding

public static java.lang.String getEncoding(javax.activation.DataHandler dh)

Returns the Content-Transfer-Encoding that needs to be applied to the given content in order to make it mail safe. This is the same as the getEncoding(DataSource) method except that instead of reading the data from an input stream it uses the writeTo method to examine the data, which can be more efficient.

decode

public static java.io.InputStream decode(java.io.InputStream is,
                                         java.lang.String encoding)
                                  throws MessagingException

Decodes the given input stream. All the encodings defined in RFC 2045 are supported here, including "base64", "quoted-printable", "7bit", "8bit", and "binary". "uuencode" is also supported.

Parameters:

is - the input stream

encoding - the encoding

Returns:

the decoded input stream

Throws:

MessagingException

encode

public static java.io.OutputStream encode(java.io.OutputStream os,
                                          java.lang.String encoding)
                                   throws MessagingException

Encodes the given output stream. All the encodings defined in RFC 2045 are supported here, including "base64", "quoted-printable", "7bit", "8bit" and "binary". "uuencode" is also supported.

Parameters:

os - the output stream

encoding - the encoding

Returns:

an output stream that applies the specified encoding

Throws:

MessagingException

encode

public static java.io.OutputStream encode(java.io.OutputStream os,
                                          java.lang.String encoding,
                                          java.lang.String filename)
                                   throws MessagingException

Encodes the given output stream. All the encodings defined in RFC 2045 are supported here, including "base64", "quoted-printable", "7bit", "8bit" and "binary". "uuencode" is also supported.

Parameters:

os - the output stream

encoding - the encoding

filename - the name for the file being encoded (this is only used with the uuencode encoding)

Returns:

an output stream that applies the specified encoding

Throws:

MessagingException

encodeText

public static java.lang.String encodeText(java.lang.String text)
                                   throws java.io.UnsupportedEncodingException

Encodes an RFC 822 "text" token into mail-safe form according to RFC 2047.

Parameters:

text - the Unicode string

UnsupportedEncodingException - if the encoding fails

Throws:

java.io.UnsupportedEncodingException

encodeText

public static java.lang.String encodeText(java.lang.String text,
                                          java.lang.String charset,
                                          java.lang.String encoding)
                                   throws java.io.UnsupportedEncodingException

Encodes an RFC 822 "text" token into mail-safe form according to RFC 2047.

Parameters:

text - the Unicode string

charset - the charset, or null to use the platform default charset

encoding - the encoding to be used ("B" or "Q")

Throws:

java.io.UnsupportedEncodingException

decodeText

public static java.lang.String decodeText(java.lang.String etext)
                                   throws java.io.UnsupportedEncodingException

Decodes headers that are defined as '*text' in RFC 822.

Parameters:

etext - the possibly encoded value

Throws:

java.io.UnsupportedEncodingException - if the charset conversion failed

encodeWord

public static java.lang.String encodeWord(java.lang.String text)
                                   throws java.io.UnsupportedEncodingException

Encodes an RFC 822 "word" token into mail-safe form according to RFC 2047.

Parameters:

text - the Unicode string

Throws:

java.io.UnsupportedEncodingException - if the encoding fails

encodeWord

public static java.lang.String encodeWord(java.lang.String text,
                                          java.lang.String charset,
                                          java.lang.String encoding)
                                   throws java.io.UnsupportedEncodingException

Encodes an RFC 822 "word" token into mail-safe form according to RFC 2047.

Parameters:

text - the Unicode string

charset - the charset, or null to use the platform default charset

encoding - the encoding to be used ("B" or "Q")

Throws:

java.io.UnsupportedEncodingException - if the encoding fails

decodeWord

public static java.lang.String decodeWord(java.lang.String text)
                                   throws ParseException,
                                          java.io.UnsupportedEncodingException

Decodes the specified string using the RFC 2047 rules for parsing an "encoded-word".

Parameters:

eword - the possibly encoded value

Throws:

ParseException - if the string is not an encoded-word

java.io.UnsupportedEncodingException - if the decoding failed

quote

public static java.lang.String quote(java.lang.String text,
                                     java.lang.String specials)

Quotes the specified word, if it contains any characters from the given "specials" list.

The HeaderTokenizer class defines two "specials" lists, MIME and RFC 822.

Parameters:

word - the word to be quoted

specials - the set of special characters

javaCharset

public static java.lang.String javaCharset(java.lang.String charset)

Converts a MIME charset name into a Java charset name.

Parameters:

charset - the MIME charset name

mimeCharset

public static java.lang.String mimeCharset(java.lang.String charset)

Converts a Java charset name into a MIME charset name.

Parameters:

charset - the Java charset name

getDefaultJavaCharset

public static java.lang.String getDefaultJavaCharset()

Returns the default Java charset.

fold

public static java.lang.String fold(int used,
                                    java.lang.String s)

Folds the specified string such that each line is no longer than 76 characters, whitespace permitting.

Parameters:

used - the number of characters used in the line already

s - the string to fold

Since:

JavaMail 1.4

unfold

public static java.lang.String unfold(java.lang.String s)

Unfolds a folded header.

Parameters:

s - the header to unfold

Since:

JavaMail 1.4