de.jstacs.utils
Class SafeOutputStream

java.lang.Object
  java.io.OutputStream
      de.jstacs.utils.SafeOutputStream

All Implemented Interfaces:

Closeable, Flushable

public class SafeOutputStream
extends OutputStream

This class is for any output. For example:

• It enables you to hide the output (use new SafeOutputStream( null )).
• It enables you to write the output to the standard output stream (use new SafeOutputStream( System.out )).
• It enables you to write the output to a file (use new SafeOutputStream( new FileOutputStream( ... ) )).
• ...

The user has to close the stream by hand. It is not closed by the finalize method.

Author:

Jens Keilwagen

Field Summary

static OutputStream

DEFAULT_STREAM This stream can be used as default stream.

Method Summary

void	close() Closes the SafeOutputStream by closing the OutputStream this stream was constructed of.
boolean	doesNothing() Indicates whether the instance is doing something or not.
protected void	finalize()
void	flush()
OutputStream	getOutputStream() Returns the internal used OutputStream.
static SafeOutputStream	getSafeOutputStream(OutputStream out) This method returns an instance of SafeOutputStream for a given OutputStream.
void	write(int b)
void	write(Object s) Writes an Object using Object.toString().
void	writeln() Writes a line break.
void	writeln(Object s) Writes an Object and a line break.

Methods inherited from class java.io.OutputStream

write, write

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_STREAM

public static final OutputStream DEFAULT_STREAM

This stream can be used as default stream.

Method Detail

getSafeOutputStream

public static SafeOutputStream getSafeOutputStream(OutputStream out)

This method returns an instance of SafeOutputStream for a given OutputStream.

Parameters:

out - the OutputStream

Returns:

an instance of SafeOutputStream for a given OutputStream.

close

public void close()
           throws IOException

Closes the SafeOutputStream by closing the OutputStream this stream was constructed of. If this SafeOutputStream was constructed using System.out this OutputStream will be closed. No outputs via System.out will be possible any more.

Specified by:

close in interface Closeable

Overrides:

close in class OutputStream

Throws:

IOException - if something went wrong in closing the output stream

doesNothing

public boolean doesNothing()

Indicates whether the instance is doing something or not.

Returns:

true if the internal OutputStream is null

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException

getOutputStream

public OutputStream getOutputStream()

Returns the internal used OutputStream.

Returns:

the internal used OutputStream

writeln

public void writeln()
             throws IOException

Writes a line break.

Throws:

IOException - if something went wrong

See Also:

write(int)

writeln

public void writeln(Object s)
             throws IOException

Writes an Object and a line break.

Parameters:

s - the Object to be written

Throws:

IOException - if something went wrong

See Also:

write(int), Object.toString()

write

public void write(Object s)
           throws IOException

Writes an Object using Object.toString().

Parameters:

s - the Object to be written

Throws:

IOException - if something went wrong

See Also:

write(int)

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

finalize

protected void finalize()
                 throws IOException

Overrides:

finalize in class Object

Throws:

IOException