org.apache.commons.httpclient
Class ChunkedInputStream

java.lang.Object
  |
  +--java.io.InputStream
        |
        +--org.apache.commons.httpclient.ChunkedInputStream

public class ChunkedInputStream

extends InputStream

Transparently coalesces chunks of a HTTP stream that uses Transfer-Encoding chunked.

Note that this class NEVER closes the underlying stream, even when close gets called. Instead, it will read until the "end" of its chunking on close, which allows for the seamless invocation of subsequent HTTP 1.1 calls, while not requiring the client to remember to read the entire contents of the response.

Since:

2.0

Author:

Ortwin Gl?ck, Sean C. Sullivan, Martin Elwin, Eric Johnson, Mike Bowler, Michael Becke, Oleg Kalnichevski

See Also:

ResponseInputStream

Constructor Summary

ChunkedInputStream(InputStream in, HttpMethod method)

Method Summary

void	close() Upon close, this reads the remainder of the chunked message, leaving the underlying socket at a position to start reading the next response without scanning.
(package private) static void	exhaustInputStream(InputStream inStream) Exhaust an input stream, reading until EOF has been encountered.
int	read() Returns all the data in a chunked stream in coalesced form.
int	read(byte[] b) Read some bytes from the stream.
int	read(byte[] b, int off, int len) Read some bytes from the stream.

Methods inherited from class java.io.InputStream

available, mark, markSupported, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkedInputStream

public ChunkedInputStream(InputStream in,
                          HttpMethod method)
                   throws IOException

Parameters:

in - must be non-null

method - must be non-null

Throws:

IOException - If an IO error occurs

Method Detail

read

public int read()
         throws IOException

Returns all the data in a chunked stream in coalesced form. A chunk is followed by a CRLF. The method returns -1 as soon as a chunksize of 0 is detected.

Trailer headers are read automcatically at the end of the stream and can be obtained with the getResponseFooters() method.

Overrides:

read in class InputStream

Returns:

-1 of the end of the stream has been reached or the next data byte

Throws:

IOException - If an IO problem occurs

See Also:

HttpMethod.getResponseFooters()

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException

Read some bytes from the stream.

Overrides:

read in class InputStream

Parameters:

b - The byte array that will hold the contents from the stream.

off - The offset into the byte array at which bytes will start to be placed.

len - the maximum number of bytes that can be returned.

Returns:

The number of bytes returned or -1 if the end of stream has been reached.

Throws:

IOException - if an IO problem occurs.

See Also:

InputStream.read(byte[], int, int)

read

public int read(byte[] b)
         throws IOException

Read some bytes from the stream.

Overrides:

read in class InputStream

Parameters:

b - The byte array that will hold the contents from the stream.

Returns:

The number of bytes returned or -1 if the end of stream has been reached.

Throws:

IOException - if an IO problem occurs.

See Also:

InputStream.read(byte[])

close

public void close()
           throws IOException

Upon close, this reads the remainder of the chunked message, leaving the underlying socket at a position to start reading the next response without scanning.

Overrides:

close in class InputStream

Throws:

IOException - If an IO problem occurs.

exhaustInputStream

static void exhaustInputStream(InputStream inStream)
                        throws IOException

Exhaust an input stream, reading until EOF has been encountered.

Note that this function is intended as a non-public utility. This is a little weird, but it seemed silly to make a utility class for this one function, so instead it is just static and shared that way.

Parameters:

inStream - The InputStream to exhaust.

Throws:

IOException - If an IO problem occurs