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java.io
Class PipedReader

java.lang.Object
  extended by java.io.Reader
      extended by java.io.PipedReader
All Implemented Interfaces:
Closeable, Readable

public class PipedReader
extends Reader

Piped character-input streams.

Since:
JDK1.1

Field Summary
 
Fields inherited from class java.io.Reader
lock
 
Constructor Summary
PipedReader()
          Creates a PipedReader so that it is not yet connected.
PipedReader(int pipeSize)
          Creates a PipedReader so that it is not yet connected and uses the specified pipe size for the pipe's buffer.
PipedReader(PipedWriter src)
          Creates a PipedReader so that it is connected to the piped writer src.
PipedReader(PipedWriter src, int pipeSize)
          Creates a PipedReader so that it is connected to the piped writer src and uses the specified pipe size for the pipe's buffer.
 
Method Summary
 void close()
          Closes this piped stream and releases any system resources associated with the stream.
 void connect(PipedWriter src)
          Causes this piped reader to be connected to the piped writer src.
 int read()
          Reads the next character of data from this piped stream.
 int read(char[] cbuf, int off, int len)
          Reads up to len characters of data from this piped stream into an array of characters.
 boolean ready()
          Tell whether this stream is ready to be read.
 
Methods inherited from class java.io.Reader
mark, markSupported, read, read, reset, skip
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PipedReader

public PipedReader(PipedWriter src)
            throws IOException
Creates a PipedReader so that it is connected to the piped writer src. Data 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.

PipedReader

public PipedReader(PipedWriter src,
                   int pipeSize)
            throws IOException
Creates a PipedReader so that it is connected to the piped writer src and uses the specified pipe size for the pipe's buffer. Data 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

PipedReader

public PipedReader()
Creates a PipedReader so that it is not yet connected. It must be connected to a PipedWriter before being used.


PipedReader

public PipedReader(int pipeSize)
Creates a PipedReader so that it is not yet connected and uses the specified pipe size for the pipe's buffer. It must be connected to a PipedWriter 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(PipedWriter src)
             throws IOException
Causes this piped reader to be connected to the piped writer src. If this object is already connected to some other piped writer, an IOException is thrown.

If src is an unconnected piped writer and snk is an unconnected piped reader, 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 writer to connect to.
Throws:
IOException - if an I/O error occurs.

read

public int read()
         throws IOException
Reads the next character of data from this piped stream. If no character 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.

Overrides:
read in class Reader
Returns:
the next character of data, or -1 if the end of the stream is reached.
Throws:
IOException - if the pipe is broken, unconnected, closed, or an I/O error occurs.

read

public int read(char[] cbuf,
                int off,
                int len)
         throws IOException
Reads up to len characters of data from this piped stream into an array of characters. Less than len characters will be read if the end of the data stream is reached or if len exceeds the pipe's buffer size. This method blocks until at least one character of input is available.

Specified by:
read in class Reader
Parameters:
cbuf - the buffer into which the data is read.
off - the start offset of the data.
len - the maximum number of characters read.
Returns:
the total number of characters read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws:
IOException - if the pipe is broken, unconnected, closed, or an I/O error occurs.

ready

public boolean ready()
              throws IOException
Tell whether this stream is ready to be read. A piped character stream is ready if the circular buffer is not empty.

Overrides:
ready in class Reader
Returns:
True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.
Throws:
IOException - if the pipe is broken, unconnected, or closed.

close

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

Specified by:
close in interface Closeable
Specified by:
close in class Reader
Throws:
IOException - if an I/O error occurs.

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