org.apache.hadoop.security
Class SaslInputStream

java.lang.Object
  java.io.InputStream
      org.apache.hadoop.security.SaslInputStream

All Implemented Interfaces:

Closeable

public class SaslInputStream
extends InputStream

A SaslInputStream is composed of an InputStream and a SaslServer (or SaslClient) so that read() methods return data that are read in from the underlying InputStream but have been additionally processed by the SaslServer (or SaslClient) object. The SaslServer (or SaslClient) object must be fully initialized before being used by a SaslInputStream.

Field Summary

static org.apache.commons.logging.Log

LOG

Constructor Summary

SaslInputStream(InputStream inStream, SaslClient saslClient)
Constructs a SASLInputStream from an InputStream and a SaslClient
Note: if the specified InputStream or SaslClient is null, a NullPointerException may be thrown later when they are used.

SaslInputStream(InputStream inStream, SaslServer saslServer)
Constructs a SASLInputStream from an InputStream and a SaslServer
Note: if the specified InputStream or SaslServer is null, a NullPointerException may be thrown later when they are used.

Method Summary

int	available() Returns the number of bytes that can be read from this input stream without blocking.
void	close() Closes this input stream and releases any system resources associated with the stream.
boolean	markSupported() Tests if this input stream supports the mark and reset methods, which it does not.
int	read() Reads the next byte of data from this input stream.
int	read(byte[] b) Reads up to b.length bytes of data from this input stream into an array of bytes.
int	read(byte[] b, int off, int len) Reads up to len bytes of data from this input stream into an array of bytes.
long	skip(long n) Skips n bytes of input from the bytes that can be read from this input stream without blocking.

Methods inherited from class java.io.InputStream

mark, reset

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

Constructor Detail

SaslInputStream

public SaslInputStream(InputStream inStream,
                       SaslServer saslServer)

Constructs a SASLInputStream from an InputStream and a SaslServer
Note: if the specified InputStream or SaslServer is null, a NullPointerException may be thrown later when they are used.

Parameters:

inStream - the InputStream to be processed

saslServer - an initialized SaslServer object

SaslInputStream

public SaslInputStream(InputStream inStream,
                       SaslClient saslClient)

Constructs a SASLInputStream from an InputStream and a SaslClient
Note: if the specified InputStream or SaslClient is null, a NullPointerException may be thrown later when they are used.

Parameters:

inStream - the InputStream to be processed

saslClient - an initialized SaslClient object

Method Detail

read

public int read()
         throws IOException

Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Specified by:

read in class InputStream

Returns:

the next byte of data, or -1 if the end of the stream is reached.

Throws:

IOException - if an I/O error occurs.

read

public int read(byte[] b)
         throws IOException

Reads up to b.length bytes of data from this input stream into an array of bytes.

The read method of InputStream calls the read method of three arguments with the arguments b, 0, and b.length.

Overrides:

read in class InputStream

Parameters:

b - the buffer into which the data is read.

Returns:

the total number of bytes read into the buffer, or -1 is there is no more data because the end of the stream has been reached.

Throws:

IOException - if an I/O error occurs.

read

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

Reads up to len bytes of data from this input stream into an array of bytes. This method blocks until some input is available. If the first argument is null, up to len bytes are read and discarded.

Overrides:

read in class InputStream

Parameters:

b - the buffer into which the data is read.

off - the start offset of the data.

len - the maximum number of bytes read.

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

IOException - if an I/O error occurs.

skip

public long skip(long n)
          throws IOException

Skips n bytes of input from the bytes that can be read from this input stream without blocking.

Fewer bytes than requested might be skipped. The actual number of bytes skipped is equal to n or the result of a call to available, whichever is smaller. If n is less than zero, no bytes are skipped.

The actual number of bytes skipped is returned.

Overrides:

skip in class InputStream

Parameters:

n - the number of bytes to be skipped.

Returns:

the actual number of bytes skipped.

Throws:

IOException - if an I/O error occurs.

available

public int available()
              throws IOException

Returns the number of bytes that can be read from this input stream without blocking. The available method of InputStream returns 0. This method should be overridden by subclasses.

Overrides:

available in class InputStream

Returns:

the number of bytes that can be read from this input stream without blocking.

Throws:

IOException - if an I/O error occurs.

close

public void close()
           throws IOException

Closes this input stream and releases any system resources associated with the stream.

The close method of SASLInputStream calls the close method of its underlying input stream.

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException - if an I/O error occurs.

markSupported

public boolean markSupported()

Tests if this input stream supports the mark and reset methods, which it does not.

Overrides:

markSupported in class InputStream

Returns:

false, since this class does not support the mark and reset methods.