javax.mail.internet
Class HeaderTokenizer

java.lang.Object
  javax.mail.internet.HeaderTokenizer

public class HeaderTokenizer
extends java.lang.Object

This class tokenizes RFC822 and MIME headers into the basic symbols specified by RFC822 and MIME.

This class handles folded headers (ie headers with embedded CRLF SPACE sequences). The folds are removed in the returned tokens.

Author:

John Mani

Nested Class Summary

static class

HeaderTokenizer.Token The Token class represents tokens returned by the HeaderTokenizer.

Field Summary

static java.lang.String	MIME MIME specials
static java.lang.String	RFC822 RFC822 specials

Constructor Summary

HeaderTokenizer(java.lang.String header)
Constructor.

HeaderTokenizer(java.lang.String header, java.lang.String delimiters)
Constructor.

HeaderTokenizer(java.lang.String header, java.lang.String delimiters, boolean skipComments)
Constructor that takes a rfc822 style header.

Method Summary

java.lang.String	getRemainder() Return the rest of the Header.
HeaderTokenizer.Token	next() Parses the next token from this String.
HeaderTokenizer.Token	peek() Peek at the next token, without actually removing the token from the parse stream.

Methods inherited from class java.lang.Object

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

Field Detail

RFC822

public static final java.lang.String RFC822

RFC822 specials

See Also:

Constant Field Values

MIME

public static final java.lang.String MIME

MIME specials

See Also:

Constant Field Values

Constructor Detail

HeaderTokenizer

public HeaderTokenizer(java.lang.String header,
                       java.lang.String delimiters,
                       boolean skipComments)

Constructor that takes a rfc822 style header.

Parameters:

header - The rfc822 header to be tokenized

delimiters - Set of delimiter characters to be used to delimit ATOMS. These are usually RFC822 or MIME

skipComments - If true, comments are skipped and not returned as tokens

HeaderTokenizer

public HeaderTokenizer(java.lang.String header,
                       java.lang.String delimiters)

Constructor. Comments are ignored and not returned as tokens

Parameters:

header - The header that is tokenized

delimiters - The delimiters to be used

HeaderTokenizer

public HeaderTokenizer(java.lang.String header)

Constructor. The RFC822 defined delimiters - RFC822 - are used to delimit ATOMS. Also comments are skipped and not returned as tokens

Method Detail

next

public HeaderTokenizer.Token next()
                           throws ParseException

Parses the next token from this String.

Clients sit in a loop calling next() to parse successive tokens until an EOF Token is returned.

Returns:

the next Token

Throws:

ParseException - if the parse fails

peek

public HeaderTokenizer.Token peek()
                           throws ParseException

Peek at the next token, without actually removing the token from the parse stream. Invoking this method multiple times will return successive tokens, until next() is called.

Returns:

the next Token

Throws:

ParseException - if the parse fails

getRemainder

public java.lang.String getRemainder()

Return the rest of the Header.

Returns:

String rest of header. null is returned if we are already at end of header