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com.tangosol.io
Class MultiByteArrayInputStream

java.lang.Object
java.io.InputStream
com.tangosol.io.MultiByteArrayInputStream

All Implemented Interfaces:

InputStreaming, java.io.Closeable

public class MultiByteArrayInputStream

extends java.io.InputStream

implements InputStreaming

Reads binary data from a series of byte arrays.

Author:

cp 2001.11.03

Field Summary

protected static byte[]	EMPTY_BYTES Empty array of bytes.
protected byte[][]	m_aabArray The array of byte arrays.
protected byte[]	m_ab The current byte array.
protected boolean	m_fDestructive True iff the array will be null'd out as it is traversed.
protected boolean	m_fEOF True after eof is determined.
protected int	m_iArray The index of the current byte array.
protected int	m_iArrayMarked The index of the marked byte array.
protected int	m_of The current offset in the current byte array.
protected int	m_ofMarked The marked offset in the marked byte array.
protected static int	MARK_UNSET Marker position indicating that stream is not marked.

Constructor Summary

MultiByteArrayInputStream(byte[][] aab)
Construct a MultiByteArrayInputStream.

MultiByteArrayInputStream(byte[][] aab, boolean fDestructive)
Construct a MultiByteArrayInputStream.

Method Summary

int	available() Returns the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream.
void	close() Close the stream.
void	mark(int readlimit) Marks the current position in this input stream.
boolean	markSupported() Tests if this input stream supports the mark and reset methods.
int	read() Reads the next byte of data from the input stream.
int	read(byte[] abDest, int ofDest, int cbDest) Reads up to len bytes of data from the input stream into an array of bytes.
void	reset() Repositions this stream to the position at the time the mark method was last called on this input stream.
long	skip(long n) Skips over and discards n bytes of data from this input stream.

Methods inherited from class java.io.InputStream

read

Methods inherited from interface com.tangosol.io.InputStreaming

read

Field Detail

EMPTY_BYTES

protected static final byte[] EMPTY_BYTES

Empty array of bytes.

MARK_UNSET

protected static final int MARK_UNSET

Marker position indicating that stream is not marked.

See Also:

Constant Field Values

m_fEOF

protected boolean m_fEOF

True after eof is determined.

m_fDestructive

protected boolean m_fDestructive

True iff the array will be null'd out as it is traversed.

m_aabArray

protected byte[][] m_aabArray

The array of byte arrays.

m_iArray

protected int m_iArray

The index of the current byte array.

m_ab

protected byte[] m_ab

The current byte array.

m_of

protected int m_of

The current offset in the current byte array.

m_iArrayMarked

protected int m_iArrayMarked

The index of the marked byte array.

m_ofMarked

protected int m_ofMarked

The marked offset in the marked byte array.

Constructor Detail

MultiByteArrayInputStream

public MultiByteArrayInputStream(byte[][] aab)

Construct a MultiByteArrayInputStream.

Parameters:

aab - a non-null array of byte arrays of data to stream, each byte array must be non-null and non-zero-length

MultiByteArrayInputStream

public MultiByteArrayInputStream(byte[][] aab,
                                 boolean fDestructive)

Construct a MultiByteArrayInputStream.

Parameters:

aab - a non-null array of byte arrays of data to stream, each byte array must be non-null and non-zero-length

fDestructive - if true the supplied array will be cleared as it is traversed, stream mark positions will be respected

Method Detail

read

public int read()
         throws java.io.IOException

Reads the next byte of data from the 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 interface InputStreaming

Specified by:

read in class java.io.InputStream

Returns:

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

Throws:

java.io.IOException - if an I/O error occurs.

read

public int read(byte[] abDest,
                int ofDest,
                int cbDest)
         throws java.io.IOException

Reads up to len bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read, possibly zero. The number of bytes actually read is returned as an integer.

Specified by:

read in interface InputStreaming

Overrides:

read in class java.io.InputStream

Parameters:

abDest - the buffer into which the data is read

ofDest - the start offset in array b at which the data is written

cbDest - the maximum number of bytes to 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:

java.io.IOException - if an I/O error occurs

available

public int available()

Returns the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream. The next caller might be the same thread or or another thread.

Specified by:

available in interface InputStreaming

Overrides:

available in class java.io.InputStream

Returns:

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

skip

public long skip(long n)

Skips over and discards n bytes of data from this input stream. The skip method may, for a variety of reasons, end up skipping over some smaller number of bytes, possibly 0. This may result from any of a number of conditions; reaching end of file before n bytes have been skipped is only one possibility. The actual number of bytes skipped is returned. If n is negative, no bytes are skipped.

Specified by:

skip in interface InputStreaming

Overrides:

skip in class java.io.InputStream

Parameters:

n - the number of bytes to be skipped

Returns:

the actual number of bytes skipped

close

public void close()

Close the stream.

Specified by:

close in interface InputStreaming

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.InputStream

mark

public void mark(int readlimit)

Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.

Specified by:

mark in interface InputStreaming

Overrides:

mark in class java.io.InputStream

Parameters:

readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid

reset

public void reset()
           throws java.io.IOException

Repositions this stream to the position at the time the mark method was last called on this input stream.

Specified by:

reset in interface InputStreaming

Overrides:

reset in class java.io.InputStream

Throws:

java.io.IOException - if the stream has not been marked

markSupported

public boolean markSupported()

Tests if this input stream supports the mark and reset methods. The markSupported method of InputStream returns false.

Specified by:

markSupported in interface InputStreaming

Overrides:

markSupported in class java.io.InputStream

Returns:

true if this true type supports the mark and reset method; false otherwise

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