java.io

Class ByteArrayInputStream

java.lang.Object

java.io.InputStream

java.io.ByteArrayInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class ByteArrayInputStream
extends InputStream

A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream. An internal counter keeps track of the next byte to be supplied by the read method.

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

Constructor Summary

Constructors

Constructor and Description
ByteArrayInputStream(byte[] buf) Creates a ByteArrayInputStream so that it uses buf as its buffer array.
ByteArrayInputStream(byte[] buf, int offset, int length) Creates ByteArrayInputStream that uses buf as its buffer array.

Method Summary

Modifier and Type	Method and Description
int	available() Returns the number of remaining bytes that can be read (or skipped over) from this input stream.
void	close() Closing a ByteArrayInputStream has no effect.
void	mark(int readAheadLimit) Set the current marked position in the stream.
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() Resets the buffer to the marked position.
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, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ByteArrayInputStream

public ByteArrayInputStream(byte[] buf)

Creates a ByteArrayInputStream so that it uses buf as its buffer array. The buffer array is not copied. The initial value of pos is 0 and the initial value of count is the length of buf.

Parameters:

buf - the input buffer.

ByteArrayInputStream

public ByteArrayInputStream(byte[] buf,
                            int offset,
                            int length)

Creates ByteArrayInputStream that uses buf as its buffer array. The initial value of pos is offset and the initial value of count is the minimum of offset+length and buf.length. The buffer array is not copied. The buffer's mark is set to the specified offset.

Parameters:

buf - the input buffer.

offset - the offset in the buffer of the first byte to read.

length - the maximum number of bytes to read from the buffer.

Method Detail

available

public int available()

Returns the number of remaining bytes that can be read (or skipped over) from this input stream.

The value returned is count - pos, which is the number of bytes remaining to be read from the input buffer.

Overrides:

available in class InputStream

Returns:

the number of remaining bytes that can be read (or skipped over) from this input stream without blocking.

close

public void close()
           throws IOException

Closing a ByteArrayInputStream 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 Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class InputStream

Throws:

IOException - if an I/O error occurs.

mark

public void mark(int readAheadLimit)

Set the current marked position in the stream. ByteArrayInputStream objects are marked at position zero by default when constructed. They may be marked at another position within the buffer by this method.

If no mark has been set, then the value of the mark is the offset passed to the constructor (or 0 if the offset was not supplied).

Note: The readAheadLimit for this class has no meaning.

Overrides:

mark in class InputStream

Parameters:

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

See Also:

InputStream.reset()

markSupported

public boolean markSupported()

Tests if this InputStream supports mark/reset. The markSupported method of ByteArrayInputStream always returns true.

Overrides:

markSupported in class InputStream

Returns:

true if this stream instance supports the mark and reset methods; false otherwise.

See Also:

InputStream.mark(int), InputStream.reset()

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 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 bytes buf[pos] through buf[pos+k-1] 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 InputStream

Parameters:

b - the buffer into which the data is read.

off - the start offset in the destination array b

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:

NullPointerException - If b is null.

IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off

See Also:

InputStream.read()

reset

public void reset()

Resets the buffer to the marked position. The marked position is 0 unless another position was marked or an offset was specified in the constructor.

Overrides:

reset in class InputStream

See Also:

InputStream.mark(int), IOException

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 InputStream

Parameters:

n - the number of bytes to be skipped.

Returns:

the actual number of bytes skipped.