weka.core
Class Tee

java.lang.Object
  extended by java.io.OutputStream
      extended by java.io.FilterOutputStream
          extended by java.io.PrintStream
              extended by weka.core.Tee
All Implemented Interfaces:
java.io.Closeable, java.io.Flushable, java.lang.Appendable, RevisionHandler

public class Tee
extends java.io.PrintStream
implements RevisionHandler

This class pipelines print/println's to several PrintStreams. Useful for redirecting System.out and System.err to files etc.
E.g., for redirecting stderr/stdout to files with timestamps and:

    import java.io.*;
    import weka.core.Tee;

    ...
    // stdout
    Tee teeOut = new Tee(System.out);
    teeOut.add(new PrintStream(new FileOutputStream("out.txt")), true);
    System.setOut(teeOut);
    
    // stderr
    Tee teeErr = new Tee(System.err);
    teeErr.add(new PrintStream(new FileOutputStream("err.txt")), true);
    System.setOut(teeErr);
    ...
 

Version:
$Revision: 1.4 $
Author:
FracPete (fracpete at waikato dot ac dot nz)

Constructor Summary
Tee()
          initializes the object, with a default printstream
Tee(java.io.PrintStream def)
          initializes the object with the given default printstream, e.g., System.out.
 
Method Summary
 void add(java.io.PrintStream p)
          adds the given PrintStream to the list of streams, with NO timestamp and NO prefix
 void add(java.io.PrintStream p, boolean timestamp)
          adds the given PrintStream to the list of streams, with NO prefix
 void add(java.io.PrintStream p, boolean timestamp, java.lang.String prefix)
          adds the given PrintStream to the list of streams
 void clear()
          removes all streams and places the default printstream, if any, again in the list
 boolean contains(java.io.PrintStream p)
          checks whether the given PrintStream is already in the list
 void flush()
          flushes all the printstreams
 java.io.PrintStream get(int index)
          returns the specified PrintStream from the list
 java.io.PrintStream getDefault()
          returns the default printstrean, can be NULL
 java.lang.String getRevision()
          Returns the revision string.
 void print(boolean x)
          prints the given boolean to the streams
 void print(int x)
          prints the given int to the streams
 void print(java.lang.Object x)
          prints the given object to the streams
 void print(java.lang.String x)
          prints the given string to the streams
 void println()
          prints a new line to the streams
 void println(boolean x)
          prints the given boolean to the streams
 void println(int x)
          prints the given int to the streams
 void println(java.lang.Object x)
          prints the given object to the streams (for Throwables we print the stack trace)
 void println(java.lang.String x)
          prints the given string to the streams
 java.io.PrintStream remove(int index)
          removes the given PrintStream from the list
 java.io.PrintStream remove(java.io.PrintStream p)
          removes the given PrintStream from the list
 int size()
          returns the number of streams currently in the list
 java.lang.String toString()
          returns only the classname and the number of streams
 
Methods inherited from class java.io.PrintStream
append, append, append, checkError, close, format, format, print, print, print, print, print, printf, printf, println, println, println, println, println, write, write
 
Methods inherited from class java.io.FilterOutputStream
write
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

Tee

public Tee()
initializes the object, with a default printstream


Tee

public Tee(java.io.PrintStream def)
initializes the object with the given default printstream, e.g., System.out.

Parameters:
def - the default printstream, remains also after calling clear()
Method Detail

clear

public void clear()
removes all streams and places the default printstream, if any, again in the list

See Also:
getDefault()

getDefault

public java.io.PrintStream getDefault()
returns the default printstrean, can be NULL

Returns:
the default printstream
See Also:
m_Default

add

public void add(java.io.PrintStream p)
adds the given PrintStream to the list of streams, with NO timestamp and NO prefix

Parameters:
p - the printstream to add

add

public void add(java.io.PrintStream p,
                boolean timestamp)
adds the given PrintStream to the list of streams, with NO prefix

Parameters:
p - the printstream to add
timestamp - whether to use timestamps or not

add

public void add(java.io.PrintStream p,
                boolean timestamp,
                java.lang.String prefix)
adds the given PrintStream to the list of streams

Parameters:
p - the printstream to add
timestamp - whether to use timestamps or not
prefix - the prefix to use

get

public java.io.PrintStream get(int index)
returns the specified PrintStream from the list

Parameters:
index - the index of the PrintStream to return
Returns:
the specified PrintStream, or null if invalid index

remove

public java.io.PrintStream remove(java.io.PrintStream p)
removes the given PrintStream from the list

Parameters:
p - the PrintStream to remove
Returns:
returns the removed PrintStream if it could be removed, null otherwise

remove

public java.io.PrintStream remove(int index)
removes the given PrintStream from the list

Parameters:
index - the index of the PrintStream to remove
Returns:
returns the removed PrintStream if it could be removed, null otherwise

contains

public boolean contains(java.io.PrintStream p)
checks whether the given PrintStream is already in the list

Parameters:
p - the PrintStream to look for
Returns:
true if the PrintStream is in the list

size

public int size()
returns the number of streams currently in the list

Returns:
the number of streams in the list

flush

public void flush()
flushes all the printstreams

Specified by:
flush in interface java.io.Flushable
Overrides:
flush in class java.io.PrintStream

print

public void print(int x)
prints the given int to the streams

Overrides:
print in class java.io.PrintStream
Parameters:
x - the object to print

print

public void print(boolean x)
prints the given boolean to the streams

Overrides:
print in class java.io.PrintStream
Parameters:
x - the object to print

print

public void print(java.lang.String x)
prints the given string to the streams

Overrides:
print in class java.io.PrintStream
Parameters:
x - the object to print

print

public void print(java.lang.Object x)
prints the given object to the streams

Overrides:
print in class java.io.PrintStream
Parameters:
x - the object to print

println

public void println()
prints a new line to the streams

Overrides:
println in class java.io.PrintStream

println

public void println(int x)
prints the given int to the streams

Overrides:
println in class java.io.PrintStream
Parameters:
x - the object to print

println

public void println(boolean x)
prints the given boolean to the streams

Overrides:
println in class java.io.PrintStream
Parameters:
x - the object to print

println

public void println(java.lang.String x)
prints the given string to the streams

Overrides:
println in class java.io.PrintStream
Parameters:
x - the object to print

println

public void println(java.lang.Object x)
prints the given object to the streams (for Throwables we print the stack trace)

Overrides:
println in class java.io.PrintStream
Parameters:
x - the object to print

toString

public java.lang.String toString()
returns only the classname and the number of streams

Overrides:
toString in class java.lang.Object
Returns:
only the classname and the number of streams

getRevision

public java.lang.String getRevision()
Returns the revision string.

Specified by:
getRevision in interface RevisionHandler
Returns:
the revision