Package org.apache.http.message

Class BasicLineFormatter

java.lang.Object

org.apache.http.message.BasicLineFormatter

All Implemented Interfaces:

LineFormatter

public class BasicLineFormatter
extends Object
implements LineFormatter

Interface for formatting elements of the HEAD section of an HTTP message. This is the complement to LineParser. There are individual methods for formatting a request line, a status line, or a header line. The formatting does not include the trailing line break sequence CR-LF. The formatted lines are returned in memory, the formatter does not depend on any specific IO mechanism. Instances of this interface are expected to be stateless and thread-safe.

Since:

4.0

Version:

$Revision: 574185 $

Author:

Remy Maucherat, Mike Bowler, Jeff Dever, Oleg Kalnichevski, and others

Field Summary

Fields

Modifier and Type	Field	Description
static BasicLineFormatter	DEFAULT	A default instance of this class, for use as default or fallback.
static BasicLineFormatter	INSTANCE

Constructor Summary

Constructors

Constructor	Description
BasicLineFormatter()

Method Summary

Modifier and Type	Method	Description
CharArrayBuffer	appendProtocolVersion(CharArrayBuffer buffer, ProtocolVersion version)	Formats a protocol version.
protected void	doFormatHeader(CharArrayBuffer buffer, Header header)	Actually formats a header.
protected void	doFormatRequestLine(CharArrayBuffer buffer, RequestLine reqline)	Actually formats a request line.
protected void	doFormatStatusLine(CharArrayBuffer buffer, StatusLine statline)	Actually formats a status line.
protected int	estimateProtocolVersionLen(ProtocolVersion version)	Guesses the length of a formatted protocol version.
static String	formatHeader(Header header, LineFormatter formatter)	Formats a header.
CharArrayBuffer	formatHeader(CharArrayBuffer buffer, Header header)	Formats a header.
static String	formatProtocolVersion(ProtocolVersion version, LineFormatter formatter)	Formats a protocol version.
static String	formatRequestLine(RequestLine reqline, LineFormatter formatter)	Formats a request line.
CharArrayBuffer	formatRequestLine(CharArrayBuffer buffer, RequestLine reqline)	Formats a request line.
static String	formatStatusLine(StatusLine statline, LineFormatter formatter)	Formats a status line.
CharArrayBuffer	formatStatusLine(CharArrayBuffer buffer, StatusLine statline)	Formats a status line.
protected CharArrayBuffer	initBuffer(CharArrayBuffer buffer)	Obtains a buffer for formatting.

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT

public static final BasicLineFormatter DEFAULT

A default instance of this class, for use as default or fallback. Note that BasicLineFormatter is not a singleton, there can be many instances of the class itself and of derived classes. The instance here provides non-customized, default behavior.

INSTANCE

public static final BasicLineFormatter INSTANCE

Constructor Details

BasicLineFormatter

public BasicLineFormatter()

Method Details

initBuffer

protected CharArrayBuffer initBuffer(CharArrayBuffer buffer)

Obtains a buffer for formatting.

Parameters:

buffer - a buffer already available, or null

Returns:

the cleared argument buffer if there is one, or a new empty buffer that can be used for formatting

formatProtocolVersion

public static final String formatProtocolVersion(ProtocolVersion version, LineFormatter formatter)

Formats a protocol version.

Parameters:

version - the protocol version to format

formatter - the formatter to use, or null for the default

Returns:

the formatted protocol version

appendProtocolVersion

public CharArrayBuffer appendProtocolVersion(CharArrayBuffer buffer, ProtocolVersion version)

Description copied from interface: LineFormatter

Formats a protocol version. This method does not follow the general contract for buffer arguments. It does not clear the argument buffer, but appends instead. The returned buffer can always be modified by the caller. Because of these differing conventions, it is not named formatProtocolVersion.

Specified by:

appendProtocolVersion in interface LineFormatter

Parameters:

buffer - a buffer to which to append, or null

version - the protocol version to format

Returns:

a buffer with the formatted protocol version appended. The caller is allowed to modify the result buffer. If the buffer argument is not null, the returned buffer is the argument buffer.

estimateProtocolVersionLen

protected int estimateProtocolVersionLen(ProtocolVersion version)

Guesses the length of a formatted protocol version. Needed to guess the length of a formatted request or status line.

Parameters:

version - the protocol version to format, or null

Returns:

the estimated length of the formatted protocol version, in characters

formatRequestLine

public static final String formatRequestLine(RequestLine reqline, LineFormatter formatter)

Formats a request line.

Parameters:

reqline - the request line to format

formatter - the formatter to use, or null for the default

Returns:

the formatted request line

formatRequestLine

public CharArrayBuffer formatRequestLine(CharArrayBuffer buffer, RequestLine reqline)

Description copied from interface: LineFormatter

Formats a request line.

Specified by:

formatRequestLine in interface LineFormatter

Parameters:

buffer - a buffer available for formatting, or null. The buffer will be cleared before use.

reqline - the request line to format

Returns:

the formatted request line

doFormatRequestLine

protected void doFormatRequestLine(CharArrayBuffer buffer, RequestLine reqline)

Actually formats a request line. Called from formatRequestLine(org.apache.http.RequestLine, org.apache.http.message.LineFormatter).

Parameters:

buffer - the empty buffer into which to format, never null

reqline - the request line to format, never null

formatStatusLine

public static final String formatStatusLine(StatusLine statline, LineFormatter formatter)

Formats a status line.

Parameters:

statline - the status line to format

formatter - the formatter to use, or null for the default

Returns:

the formatted status line

formatStatusLine

public CharArrayBuffer formatStatusLine(CharArrayBuffer buffer, StatusLine statline)

Description copied from interface: LineFormatter

Formats a status line.

Specified by:

formatStatusLine in interface LineFormatter

Parameters:

buffer - a buffer available for formatting, or null. The buffer will be cleared before use.

statline - the status line to format

Returns:

the formatted status line

doFormatStatusLine

protected void doFormatStatusLine(CharArrayBuffer buffer, StatusLine statline)

Actually formats a status line. Called from formatStatusLine(org.apache.http.StatusLine, org.apache.http.message.LineFormatter).

Parameters:

buffer - the empty buffer into which to format, never null

statline - the status line to format, never null

formatHeader

public static final String formatHeader(Header header, LineFormatter formatter)

Formats a header.

Parameters:

header - the header to format

formatter - the formatter to use, or null for the default

Returns:

the formatted header

formatHeader

public CharArrayBuffer formatHeader(CharArrayBuffer buffer, Header header)

Description copied from interface: LineFormatter

Formats a header. Due to header continuation, the result may be multiple lines. In order to generate well-formed HTTP, the lines in the result must be separated by the HTTP line break sequence CR-LF. There is no trailing CR-LF in the result.
See the class comment for details about the buffer argument.

Specified by:

formatHeader in interface LineFormatter

Parameters:

buffer - a buffer available for formatting, or null. The buffer will be cleared before use.

header - the header to format

Returns:

a buffer holding the formatted header, never null. The returned buffer may be different from the argument buffer.

doFormatHeader

protected void doFormatHeader(CharArrayBuffer buffer, Header header)

Actually formats a header. Called from formatHeader(org.apache.http.Header, org.apache.http.message.LineFormatter).

Parameters:

buffer - the empty buffer into which to format, never null

header - the header to format, never null