PipedReader (Java Platform SE 6)

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java.io
class PipedReader

java.lang.Object
  java.io.Reader
      java.io.PipedReader

All Implemented Interfaces:: Closeable, Readable

Most common way to construct:

PipedReader reader = new PipedReader();

Based on 38 examples

public class PipedReader
extends Reader

Piped character-input streams.

See Also (auto-generated):

BufferedReader

PipedWriter

PrintWriter

Field Summary

Fields inherited from class java.io.Reader
`lock`

Constructor Summary
`PipedReader()` Creates a `PipedReader` so that it is not yet java.io.PipedReader.connect.
`PipedReader(int pipeSize)` Creates a `PipedReader` so that it is not yet java.io.PipedReader.connect 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
`close, mark, markSupported, read, read, read, read, ready, 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()

Creates a PipedReader so that it is not yet {@linkplain #connect(java.io.PipedWriter) connected}. It must be {@linkplain java.io.PipedWriter#connect( java.io.PipedReader) connected} to a PipedWriter before being used.

PipedReader

public PipedReader(int pipeSize)

Creates a PipedReader so that it is not yet {@link #connect(java.io.PipedWriter) connected} and uses the specified pipe size for the pipe's buffer. It must be {@linkplain java.io.PipedWriter#connect( java.io.PipedReader) connected} to a PipedWriter before being used.

Parameters:: pipeSize - the size of the pipe's buffer.

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.

Method Detail

close

public void close()
           throws IOException

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

Overrides:: close in class Reader
Throws:: IOException - if an I/O error occurs.

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 synchronized 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, {@link #connect(java.io.PipedWriter) unconnected}, closed, or an I/O error occurs.

read

public synchronized 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.

Overrides:: 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, {@link #connect(java.io.PipedWriter) unconnected}, closed, or an I/O error occurs.

ready

public synchronized 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
Throws:: IOException - if the pipe is broken, {@link #connect(java.io.PipedWriter) unconnected}, or closed.