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java.lang.Object
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+----java.io.InputStream
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+----java.io.FilterInputStream
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+----java.io.BufferedInputStream
buf count marklimit mark method before subsequent calls to the reset method fail. markpos pos field at the time the last mark method was called. pos 
BufferedInputStream(InputStream) BufferedInputStream(InputStream, int) 
available() mark(int) markSupported() mark and reset methods. read() read(byte[], int, int) reset() mark method was last called on this input stream. skip(long) n bytes of data from the input stream. 
buf
protected byte buf[]
count
protected int count
pos
protected int pos
buf array. markpos
protected int markpos
pos field at the time the last mark method was called. The value of this field is -1 if there is no current mark. marklimit
protected int marklimit
mark method before subsequent calls to the reset method fail.
BufferedInputStream
public BufferedInputStream(InputStream in)
BufferedInputStream
public BufferedInputStream(InputStream in,
int size)
read
public synchronized int read() throws IOException
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. The read method of BufferedInputStream returns the next byte of data from its buffer if the buffer is not empty. Otherwise, it refills the buffer from the underlying input stream and returns the next character, if the underlying stream has not returned an end-of-stream indicator.
-1 if the end of the stream is reached. read
public synchronized int read(byte b[],
int off,
int len) throws IOException
If this stream's buffer is not empty, bytes are copied from it into the array argument. Otherwise, the buffer is refilled from the underlying input stream and, unless the stream returns an end-of-stream indication, the array argument is filled with characters from the newly-filled buffer.
As an optimization, if the buffer is empty, the mark is not valid, and len is at least as large as the buffer, then this method will read directly from the underlying stream into the given array. Thus redundant BufferedInputStreams will not copy data unnecessarily.
-1 if the end of the stream has been reached. skip
public synchronized long skip(long n) throws IOException
n bytes of data from the input stream. The skip method may, for a variety of reasons, end up skipping over some smaller number of bytes, possibly zero. The actual number of bytes skipped is returned. The skip method of BufferedInputStream compares the number of bytes it has available in its buffer, k, where k = count - pos, with n. If n ≤ k, then the pos field is incremented by n. Otherwise, the pos field is incremented to have the value count, and the remaining bytes are skipped by calling the skip method on the underlying input stream, supplying the argument n - k.
available
public synchronized int available() throws IOException
The available method of BufferedInputStream returns the sum of the the number of bytes remaining to be read in the buffer (count - pos) and the result of calling the available method of the underlying input stream.
mark
public synchronized void mark(int readlimit)
reset method repositions the stream at the last marked position so that subsequent reads re-read the same bytes. The readlimit argument tells the input stream to allow that many bytes to be read before the mark position gets invalidated.
reset
public synchronized void reset() throws IOException
mark method was last called on this input stream. If the stream has not been marked, or if the mark has been invalidated, an IOException is thrown. Stream marks are intended to be used in situations where you need to read ahead a little to see what's in the stream. Often this is most easily done by invoking some general parser. If the stream is of the type handled by the parser, it just chugs along happily. If the stream is not of that type, the parser should toss an exception when it fails. If an exception gets tossed within readlimit bytes, the parser will allow the outer code to reset the stream and to try another parser.
markSupported
public boolean markSupported()
mark and reset methods. The markSupported method of BufferedInputStream returns true. boolean indicating if this stream type supports the mark and reset methods. All Packages Class Hierarchy This Package Previous Next Index