Class PipedInputStream 
java.lang.Object 
java.io.InputStream java.io.PipedInputStream     All Implemented Interfaces: 
Closeable, AutoCloseable
  public class PipedInputStream extends InputStream A piped input stream should be connected to a piped output stream; the piped input stream then provides whatever data bytes are written to the piped output stream. Typically, data is read from a PipedInputStream object by one thread and data is written to the corresponding PipedOutputStream by some other thread. Attempting to use both objects from a single thread is not recommended, as it may deadlock the thread. The piped input stream contains a buffer, decoupling read operations from write operations, within limits. A pipe is said to be  broken  if a thread that was providing data bytes to the connected piped output stream is no longer alive.  Since: 1.0 See Also:   PipedOutputStream       Field Summary  
Modifier and Type
Field
Description


protected byte[]
buffer
 The circular buffer into which incoming data is placed. 


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. 


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. 


protected static final int
PIPE_SIZE
 The default size of the pipe's circular input buffer. 

  Constructor Summary  
Constructor
Description


PipedInputStream()
 Creates a PipedInputStream so that it is not yet connected. 


PipedInputStream(int pipeSize)
 Creates a PipedInputStream so that it is not yet connected and uses the specified pipe size for the pipe's buffer. 


PipedInputStream(PipedOutputStream src)
 Creates a PipedInputStream so that it is connected to the piped output stream src. 


PipedInputStream(PipedOutputStream src,
 int pipeSize)
 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. 

  Method Summary    
Modifier and Type
Method
Description


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


void
close()
 Closes this piped input stream and releases any system resources associated with the stream. 


void
connect(PipedOutputStream src)
 Causes this piped input stream to be connected to the piped output stream src. 


int
read()
 Reads the next byte of data from this piped input stream. 


int
read(byte[] b,
 int off,
 int len)
 Reads up to len bytes of data from this piped input stream into an array of bytes. 


protected void
receive(int b)
 Receives a byte of data. 

    Methods declared in class java.io.InputStream
 mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo
  Methods declared in class java.lang.Object
 clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
     Field Details  PIPE_SIZE protected static final int PIPE_SIZE The default size of the pipe's circular input buffer.  Since: 1.1 See Also:   Constant Field Values     buffer protected byte[] buffer The circular buffer into which incoming data is placed.  Since: 1.1   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: 1.1   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: 1.1   Constructor Details  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 Details  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: 1.1   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: 1.0.2   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 AutoCloseable
 Specified by: 
close in interface Closeable
 Overrides: 
close in class InputStream
 Throws: 
IOException - if an I/O error occurs.   

    
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