org.hyperic.util
Class RandomByteInputStream

java.lang.Object
  java.io.InputStream
      org.hyperic.util.RandomByteInputStream

All Implemented Interfaces:

java.io.Closeable

public class RandomByteInputStream
extends java.io.InputStream

A RandomByteInputStream supplies random bytes corresponding to the ascii character range that may be read from the stream. It has an associated size and maintains an internal counter to test whether the end of the stream is reached during a read operation.

Closing a RandomByteInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

Field Summary

protected int	count The number of bytes that can be read from this input stream.
protected int	pos The index of the next character to read from the input stream buffer.
protected char	random The random char that will be used to fill up this InputStream

Constructor Summary

RandomByteInputStream(int length)
Creates a RandomByteInputStream of the specified length.

Method Summary

int	available() Returns the number of bytes that can be read from this input stream without blocking.
void	close() Closing a RandomByteInputStream has no effect.
void	mark(int readAheadLimit) The mark method of RandomByteInputStream always throws an UnsupportedOperationException.
boolean	markSupported() Tests if this InputStream supports mark/reset.
int	read() Reads the next byte of data from this input stream.
int	read(byte[] b, int off, int len) Reads up to len bytes of data into an array of bytes from this input stream.
void	reset() The reset method of RandomByteInputStream always throws an UnsupportedOperationException.
long	skip(long n) Skips n bytes of input from this input stream.

Methods inherited from class java.io.InputStream

read

Methods inherited from class java.lang.Object

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

Field Detail

pos

protected int pos

The index of the next character to read from the input stream buffer. This value should always be nonnegative and not larger than the value of count.

count

protected int count

The number of bytes that can be read from this input stream.

random

protected char random

The random char that will be used to fill up this InputStream

Constructor Detail

RandomByteInputStream

public RandomByteInputStream(int length)

Creates a RandomByteInputStream of the specified length.

Parameters:

length - the number of bytes available from this input stream.

Method Detail

read

public int read()

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 read method cannot block.

Specified by:

read in class java.io.InputStream

Returns:

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

read

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

Reads up to len bytes of data into an array of bytes from this input stream. If pos equals count, then -1 is returned to indicate end of file. Otherwise, the number k of bytes read is equal to the smaller of len and count-pos. If k is positive, then k bytes are copied into b[off] through b[off+k-1] in the manner performed by System.arraycopy. The value k is added into pos and k is returned.

This read method cannot block.

Overrides:

read in class java.io.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.

skip

public long skip(long n)

Skips n bytes of input from this input stream. Fewer bytes might be skipped if the end of the input stream is reached. The actual number k of bytes to be skipped is equal to the smaller of n and count-pos. The value k is added into pos and k is returned.

Overrides:

skip in class java.io.InputStream

Parameters:

n - the number of bytes to be skipped.

Returns:

the actual number of bytes skipped.

available

public int available()

Returns the number of bytes that can be read from this input stream without blocking. The value returned is count - pos, which is the number of bytes remaining to be read from the input buffer.

Overrides:

available in class java.io.InputStream

Returns:

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

markSupported

public boolean markSupported()

Tests if this InputStream supports mark/reset. The markSupported method of RandomByteInputStream always returns false.

Overrides:

markSupported in class java.io.InputStream

mark

public void mark(int readAheadLimit)

The mark method of RandomByteInputStream always throws an UnsupportedOperationException.

Overrides:

mark in class java.io.InputStream

reset

public void reset()

The reset method of RandomByteInputStream always throws an UnsupportedOperationException.

Overrides:

reset in class java.io.InputStream

close

public void close()
           throws java.io.IOException

Closing a RandomByteInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException