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Field Summary

Constructor Summary

Method Summary

• Methods declared in class java.io.InputStream

  nullInputStream,read,readAllBytes,readNBytes,readNBytes,transferTo

• Methods declared in 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. Elementsbuf[0] throughbuf[count-1] are the only bytes that can ever be read from the stream; elementbuf[pos] is the next byte to be read.

• 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 ofcount. The next byte to be read from the input stream buffer will bebuf[pos].

• 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 themark() method. The current buffer position is set to this point by thereset() 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).

  Since:

  1.1

• 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 ofbuf. It is one greater than the position of the last byte withinbuf that can ever be read from the input stream buffer.

Constructor Detail

• ByteArrayInputStream

  public ByteArrayInputStream​(byte[] buf)

  Creates aByteArrayInputStream so that it usesbuf as its buffer array. The buffer array is not copied. The initial value ofpos is0 and the initial value ofcount is the length ofbuf.

  Parameters:

  buf - the input buffer.

• ByteArrayInputStream

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

  CreatesByteArrayInputStream that usesbuf as its buffer array. The initial value ofpos isoffset and the initial value ofcount is the minimum ofoffset+length andbuf.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

• read

  public int read()

  Reads the next byte of data from this input stream. The value byte is returned as anint in the range0 to255. If no byte is available because the end of the stream has been reached, the value-1 is returned.

  Thisread 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 tolen bytes of data into an array of bytes from this input stream. Ifpos equalscount, then-1 is returned to indicate end of file. Otherwise, the numberk of bytes read is equal to the smaller oflen andcount-pos. Ifk is positive, then bytesbuf[pos] throughbuf[pos+k-1] are copied intob[off] throughb[off+k-1] in the manner performed bySystem.arraycopy. The valuek is added intopos andk is returned.

  Thisread 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 arrayb

  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 - Ifb isnull.

  IndexOutOfBoundsException - Ifoff is negative,len is negative, orlen is greater thanb.length - off

  See Also:

  InputStream.read()

• skip

  public long skip​(long n)

  Skipsn bytes of input from this input stream. Fewer bytes might be skipped if the end of the input stream is reached. The actual numberk of bytes to be skipped is equal to the smaller ofn andcount-pos. The valuek is added intopos andk is returned.

  Overrides:

  skip in class 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 remaining bytes that can be read (or skipped over) from this input stream.

  The value returned iscount - 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.

• markSupported

  public boolean markSupported()

  Tests if thisInputStream supports mark/reset. ThemarkSupported method ofByteArrayInputStream always returnstrue.

  Overrides:

  markSupported in class InputStream

  Returns:

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

  Since:

  1.1

  See Also:

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

• 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: ThereadAheadLimit 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.

  Since:

  1.1

  See Also:

  InputStream.reset()

• 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

• close

  public void close()           throwsIOException

  Closing aByteArrayInputStream has no effect. The methods in this class can be called after the stream has been closed without generating anIOException.

  Specified by:

  close in interface AutoCloseable

  Specified by:

  close in interface Closeable

  Overrides:

  close in class InputStream

  Throws:

  IOException - if an I/O error occurs.