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java.io
class ByteArrayInputStream

java.lang.Object extended by java.io.InputStream extended by java.io.ByteArrayInputStream
All Implemented Interfaces:
Closeable

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.

See Also (auto-generated):

ByteArrayOutputStream

InputStream

File


Field Summary
protected byte[] buf
          An array of bytes that was provided by the creator of the stream.
protected int count
          The index one greater than the last valid character in the input stream buffer.
protected int mark
          The currently marked position in the stream.
protected int pos
          The index of the next character to read from the input stream buffer.
 
Constructor Summary

          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
 int

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

          Closing a ByteArrayInputStream has no effect.
 void
mark(int readAheadLimit)

          Set the current marked position in the stream.
 boolean

          Tests if this InputStream supports mark/reset.
 int

          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

          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
available, close, mark, markSupported, read, read, read, reset, skip
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

buf

protected byte[] buf
An array of bytes that was provided by the creator of the stream. Elements buf[0] through buf[count-1] are the only bytes that can ever be read from the stream; element buf[pos] is the next byte to be read.

count

protected int count
The index one greater than the last valid character in the input stream buffer. This value should always be nonnegative and not larger than the length of buf. It is one greater than the position of the last byte within buf that can ever be read from the input stream buffer.

mark

protected int mark
The currently 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 the mark() method. The current buffer position is set to this point by the reset() method.

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


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. The next byte to be read from the input stream buffer will be buf[pos].
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 synchronized 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.

Overrides:
close in class InputStream
Throws:
IOException

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

markSupported

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

Overrides:
markSupported in class InputStream

read

public synchronized 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.

Overrides:
read in class InputStream
Returns:
the next byte of data, or -1 if the end of the stream has been reached.

read

public synchronized 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.

reset

public synchronized 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

skip

public synchronized 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.


This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.
This page displays the Jadeite version of the documention, which is derived from the offical documentation that contains this copyright notice:
Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
The official Sun™ documentation can be found here at http://java.sun.com/javase/6/docs/api/.