Field Summary

Constructor Summary

Method Summary

Field Details

• buf

  protected volatile byte[] buf

  The internal buffer array where the data is stored. When necessary, it may be replaced by another array of a different size.

• count

  protected int count

  The index one greater than the index of the last valid byte in the buffer. This value is always in the range0 throughbuf.length; elementsbuf[0] throughbuf[count-1] contain buffered input data obtained from the underlying input stream.

• pos

  protected int pos

  The current position in the buffer. This is the index of the next character to be read from thebuf array.

  This value is always in the range0 throughcount. If it is less thancount, thenbuf[pos] is the next byte to be supplied as input; if it is equal tocount, then the nextread orskip operation will require more bytes to be read from the contained input stream.

  See Also:

  • buf

• markpos

  protected int markpos

  The value of thepos field at the time the lastmark method was called.

  This value is always in the range-1 throughpos. If there is no marked position in the input stream, this field is-1. If there is a marked position in the input stream, thenbuf[markpos] is the first byte to be supplied as input after areset operation. Ifmarkpos is not-1, then all bytes from positionsbuf[markpos] throughbuf[pos-1] must remain in the buffer array (though they may be moved to another place in the buffer array, with suitable adjustments to the values ofcount,pos, andmarkpos); they may not be discarded unless and until the difference betweenpos andmarkpos exceedsmarklimit.

  See Also:

  • mark(int)
  • pos

• marklimit

  protected int marklimit

  The maximum read ahead allowed after a call to themark method before subsequent calls to thereset method fail. Whenever the difference betweenpos andmarkpos exceedsmarklimit, then the mark may be dropped by settingmarkpos to-1.

  See Also:

  • mark(int)
  • reset()

Constructor Details

• BufferedInputStream

  public BufferedInputStream(InputStream in)

  Creates aBufferedInputStream and saves its argument, the input streamin, for later use. An internal buffer array is created and stored inbuf.

  Parameters:

  in - the underlying input stream.

• BufferedInputStream

  public BufferedInputStream(InputStream in, int size)

  Creates aBufferedInputStream with the specified buffer size, and saves its argument, the input streamin, for later use. An internal buffer array of lengthsize is created and stored inbuf.

  Parameters:

  in - the underlying input stream.

  size - the buffer size.

  Throws:

  IllegalArgumentException - ifsize <= 0.

Method Details

• read

  public int read() throwsIOException

  See the general contract of theread method ofInputStream.

  Overrides:

  read in class FilterInputStream

  Returns:

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

  Throws:

  IOException - if this input stream has been closed by invoking itsclose() method, or an I/O error occurs.

  See Also:

  • FilterInputStream.in

• read

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

  Reads bytes from this byte-input stream into the specified byte array, starting at the given offset.

  This method implements the general contract of the correspondingread method of theInputStream class. As an additional convenience, it attempts to read as many bytes as possible by repeatedly invoking theread method of the underlying stream. This iteratedread continues until one of the following conditions becomes true:

  • The specified number of bytes have been read,
  • Theread method of the underlying stream returns-1, indicating end-of-file, or
  • Theavailable method of the underlying stream returns zero, indicating that further input requests would block.

  If the firstread on the underlying stream returns-1 to indicate end-of-file then this method returns-1. Otherwise this method returns the number of bytes actually read.

  Subclasses of this class are encouraged, but not required, to attempt to read as many bytes as possible in the same fashion.

  Overrides:

  read in class FilterInputStream

  Parameters:

  b - destination buffer.

  off - offset at which to start storing bytes.

  len - maximum number of bytes to read.

  Returns:

  the number of bytes read, or-1 if the end of the stream has been reached.

  Throws:

  IOException - if this input stream has been closed by invoking itsclose() method, or an I/O error occurs.

  See Also:

  • FilterInputStream.in

• skip

  public long skip(long n) throwsIOException

  See the general contract of theskip method ofInputStream.

  Overrides:

  skip in class FilterInputStream

  Parameters:

  n - the number of bytes to be skipped.

  Returns:

  the actual number of bytes skipped.

  Throws:

  IOException - if this input stream has been closed by invoking itsclose() method,in.skip(n) throws an IOException, or an I/O error occurs.

  See Also:

  • InputStream.skipNBytes(long)

• available

  public int available() throwsIOException

  Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.

  This method returns the sum of the number of bytes remaining to be read in the buffer (count - pos) and the result of calling thein.available().

  Overrides:

  available in class FilterInputStream

  Returns:

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

  Throws:

  IOException - if this input stream has been closed by invoking itsclose() method, or an I/O error occurs.

• mark

  public void mark(int readlimit)

  See the general contract of themark method ofInputStream.

  Overrides:

  mark in class FilterInputStream

  Parameters:

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

  See Also:

  • reset()

• reset

  public void reset() throwsIOException

  See the general contract of thereset method ofInputStream.

  Ifmarkpos is-1 (no mark has been set or the mark has been invalidated), anIOException is thrown. Otherwise,pos is set equal tomarkpos.

  Overrides:

  reset in class FilterInputStream

  Throws:

  IOException - if this stream has not been marked or, if the mark has been invalidated, or the stream has been closed by invoking itsclose() method, or an I/O error occurs.

  See Also:

  • mark(int)

• markSupported

  public boolean markSupported()

  Tests if this input stream supports themark andreset methods. ThemarkSupported method ofBufferedInputStream returnstrue.

  Overrides:

  markSupported in class FilterInputStream

  Returns:

  aboolean indicating if this stream type supports themark andreset methods.

  See Also:

  • InputStream.mark(int)
  • InputStream.reset()

• close

  public void close() throwsIOException

  Closes this input stream and releases any system resources associated with the stream. Once the stream has been closed, further read(), available(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

  Specified by:

  close in interface AutoCloseable

  Specified by:

  close in interface Closeable

  Overrides:

  close in class FilterInputStream

  Throws:

  IOException - if an I/O error occurs.

  See Also:

  • FilterInputStream.in