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java.io
Class PipedReader
java.lang.Object
java.io.Reader
java.io.PipedReader
-
All Implemented Interfaces:
-
Closeable
,
Readable
-
public class PipedReader
- extends Reader
Piped character-input streams.
-
Since:
-
JDK1.1
Constructor Summary
|
PipedReader
()
Creates a PipedReader so that it is not yet
connected
connected.
|
PipedReader
(int pipeSize)
Creates a PipedReader so that it is not yet
connected
|
PipedReader
(
PipedWriter
src)
Creates a PipedReader so that it is connected to the piped writer src. |
PipedReader
(
PipedWriter
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.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
|
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
Creates a PipedReader so that it is not yet connected. It must be connected to a PipedWriter before being used.
-
See Also:
-
connect(java.io.PipedWriter)
. It must be
connected
,
PipedWriter.connect(java.io.PipedReader)
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
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.
If a thread was providing data characters to the connected piped writer, but the thread is no longer alive, then an IOException 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.
- if the pipe is broken.
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.
reached.
This method blocks until at least one character of input is available.
If a thread was providing data characters to the connected piped output, but the thread is no longer alive, then an IOException is thrown.
-
-
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.
- If an I/O error occurs
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.