Package eu.simuline.octave.util

Class NoCloseWriter

java.lang.Object

java.io.Writer

eu.simuline.octave.util.NoCloseWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

public final class NoCloseWriter
extends Writer

Will protect a Writer from being closed by close(), useful for protecting stdout and stderr from being closed. Trying to close via close() results in loosing connection whereas reallyClose() really closes the writer.

Author:

Kim Hansen

Field Summary

Fields

Modifier and Type	Field	Description
private static org.apache.commons.logging.Log	LOG
private Writer	writer	A writer or null.

Fields inherited from class java.io.Writer

lock

Constructor Summary

Constructors

Constructor	Description
NoCloseWriter(Writer writer)	Create a NoCloseWriter that will protect writer.

Method Summary

Modifier and Type	Method	Description
void	close()	Flushes the writer and looses the connection to it.
void	flush()
void	reallyClose()	Really closes the underlying writer, with one exception ;-).
void	write(char[] cbuf, int off, int len)

Methods inherited from class java.io.Writer

append, append, append, nullWriter, write, write, write, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

private static final org.apache.commons.logging.Log LOG

writer

private Writer writer

A writer or null. The latter is the case if initialized with null, or if tried to close via close(). In the latter case it is not even possible to close with reallyClose().

Constructor Detail

NoCloseWriter

public NoCloseWriter(Writer writer)

Create a NoCloseWriter that will protect writer.

Parameters:

writer - the writer to be protected from being closed by close().

Method Detail

write

public void write(char[] cbuf,
                  int off,
                  int len)
           throws IOException

Specified by:

write in class Writer

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Specified by:

flush in class Writer

Throws:

IOException

close

public void close()
           throws IOException

Flushes the writer and looses the connection to it. No close and also in future no close possible.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class Writer

Throws:

IOException - from the underlying writer.

See Also:

reallyClose()

reallyClose

public void reallyClose()
                 throws IOException

Really closes the underlying writer, with one exception ;-).

Throws:

IOException - from the underlying writer.

NullPointerException - if the NoCloseWriter has been closed via close().