Class PipedInputStream

Field Detail

• PIPE_SIZE

  protected static final int PIPE_SIZE

  The default size of the pipe's circular input buffer.

  Since:

  JDK1.1

  See Also:

  Constant Field Values

• buffer

  protected byte[] buffer

  The circular buffer into which incoming data is placed.

  Since:

  JDK1.1

• in

  protected int in

  The index of the position in the circular buffer at which the next byte of data will be stored when received from the connected piped output stream. in<0 implies the buffer is empty, in==out implies the buffer is full

  Since:

  JDK1.1

• out

  protected int out

  The index of the position in the circular buffer at which the next byte of data will be read by this piped input stream.

  Since:

  JDK1.1

Constructor Detail

• PipedInputStream

  public PipedInputStream(PipedOutputStream src)
                   throws IOException

  Creates a PipedInputStream so that it is connected to the piped output stream src. Data bytes written to src will then be available as input from this stream.

  Parameters:

  src - the stream to connect to.

  Throws:

  IOException - if an I/O error occurs.

• PipedInputStream

  public PipedInputStream(PipedOutputStream src,
                  int pipeSize)
                   throws IOException

  Creates a PipedInputStream so that it is connected to the piped output stream src and uses the specified pipe size for the pipe's buffer. Data bytes written to src will then be available as input from this stream.

  Parameters:

  src - the stream to connect to.

  pipeSize - the size of the pipe's buffer.

  Throws:

  IOException - if an I/O error occurs.

  IllegalArgumentException - if pipeSize <= 0.

  Since:

  1.6

• PipedInputStream

  public PipedInputStream()

  Creates a PipedInputStream so that it is not yet connected. It must be connected to a PipedOutputStream before being used.

• PipedInputStream

  public PipedInputStream(int pipeSize)

  Creates a PipedInputStream so that it is not yet connected and uses the specified pipe size for the pipe's buffer. It must be connected to a PipedOutputStream before being used.

  Parameters:

  pipeSize - the size of the pipe's buffer.

  Throws:

  IllegalArgumentException - if pipeSize <= 0.

  Since:

  1.6

Method Detail

• connect

  public void connect(PipedOutputStream src)
               throws IOException

  Causes this piped input stream to be connected to the piped output stream src. If this object is already connected to some other piped output stream, an IOException is thrown.

  If src is an unconnected piped output stream and snk is an unconnected piped input stream, they may be connected by either the call:

  snk.connect(src) 

  or the call:

  src.connect(snk) 

  The two calls have the same effect.

  Parameters:

  src - The piped output stream to connect to.

  Throws:

  IOException - if an I/O error occurs.

• receive

  protected void receive(int b)
                  throws IOException

  Receives a byte of data. This method will block if no input is available.

  Parameters:

  b - the byte being received

  Throws:

  IOException - If the pipe is broken, unconnected, closed, or if an I/O error occurs.

  Since:

  JDK1.1

• read

  public int read()
           throws IOException

  Reads the next byte of data from this piped input stream. The value byte is returned as an int in the range 0 to 255. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

  Specified by:

  read in class InputStream

  Returns:

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

  Throws:

  IOException - if the pipe is unconnected, broken, closed, or if an I/O error occurs.

• read

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

  Reads up to len bytes of data from this piped input stream into an array of bytes. Less than len bytes will be read if the end of the data stream is reached or if len exceeds the pipe's buffer size. If len is zero, then no bytes are read and 0 is returned; otherwise, the method blocks until at least 1 byte of input is available, end of the stream has been detected, or an exception is thrown.

  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

  IOException - if the pipe is broken, unconnected, closed, or if an I/O error occurs.

  See Also:

  InputStream.read()

• available

  public int available()
                throws IOException

  Returns the number of bytes that can be read from this input stream without blocking.

  Overrides:

  available in class InputStream

  Returns:

  the number of bytes that can be read from this input stream without blocking, or 0 if this input stream has been closed by invoking its close() method, or if the pipe is unconnected, or broken.

  Throws:

  IOException - if an I/O error occurs.

  Since:

  JDK1.0.2

• close

  public void close()
             throws IOException

  Closes this piped input stream and releases any system resources associated with the stream.

  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.