weka.core

Class Tee

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

java.io.PrintStream

weka.core.Tee

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable, RevisionHandler

public class Tee
extends 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: 11247 $

Author:

FracPete (fracpete at waikato dot ac dot nz)

Constructor Summary

Constructors

Constructor and Description
Tee() initializes the object, with a default printstream.
Tee(PrintStream def) initializes the object with the given default printstream, e.g., System.out.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(PrintStream p) adds the given PrintStream to the list of streams, with NO timestamp and NO prefix.
void	add(PrintStream p, boolean timestamp) adds the given PrintStream to the list of streams, with NO prefix.
void	add(PrintStream p, boolean timestamp, 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(PrintStream p) checks whether the given PrintStream is already in the list.
void	flush() flushes all the printstreams.
PrintStream	get(int index) returns the specified PrintStream from the list.
PrintStream	getDefault() returns the default printstrean, can be NULL.
String	getRevision() Returns the revision string.
void	print(boolean x) prints the given boolean to the streams.
void	print(char x) prints the given char to the streams.
void	print(char[] x) prints the given char array to the streams.
void	print(double x) prints the given double to the streams.
void	print(float x) prints the given float to the streams.
void	print(int x) prints the given int to the streams.
void	print(long x) prints the given long to the streams.
void	print(Object x) prints the given object to the streams.
void	print(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(char x) prints the given char to the streams.
void	println(char[] x) prints the given char array to the streams.
void	println(double x) prints the given double to the streams.
void	println(float x) prints the given float to the streams.
void	println(int x) prints the given int to the streams.
void	println(long x) prints the given long to the streams.
void	println(Object x) prints the given object to the streams (for Throwables we print the stack trace).
void	println(String x) prints the given string to the streams.
PrintStream	remove(int index) removes the given PrintStream from the list.
PrintStream	remove(PrintStream p) removes the given PrintStream from the list.
int	size() returns the number of streams currently in the list.
String	toString() returns only the classname and the number of streams.
void	write(byte[] buf, int off, int len) Writes len bytes from the specified byte array starting at offset off to this stream.
void	write(int b) Writes the specified byte to this stream.

Methods inherited from class java.io.PrintStream

append, append, append, checkError, close, format, format, printf, printf

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(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 PrintStream getDefault()

returns the default printstrean, can be NULL.

Returns:

the default printstream

See Also:

m_Default

add

public void add(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(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(PrintStream p,
       boolean timestamp,
       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 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 PrintStream remove(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 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(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 Flushable

Overrides:

flush in class PrintStream

print

public void print(int x)

prints the given int to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

print

public void print(long x)

prints the given long to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

print

public void print(float x)

prints the given float to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

print

public void print(double x)

prints the given double to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

print

public void print(boolean x)

prints the given boolean to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

print

public void print(char x)

prints the given char to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

print

public void print(char[] x)

prints the given char array to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

print

public void print(String x)

prints the given string to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

print

public void print(Object x)

prints the given object to the streams.

Overrides:

print in class PrintStream

Parameters:

x - the object to print

println

public void println()

prints a new line to the streams.

Overrides:

println in class PrintStream

println

public void println(int x)

prints the given int to the streams.

Overrides:

println in class PrintStream

Parameters:

x - the object to print

println

public void println(long x)

prints the given long to the streams.

Overrides:

println in class PrintStream

Parameters:

x - the object to print

println

public void println(float x)

prints the given float to the streams.

Overrides:

println in class PrintStream

Parameters:

x - the object to print

println

public void println(double x)

prints the given double to the streams.

Overrides:

println in class PrintStream

Parameters:

x - the object to print

println

public void println(boolean x)

prints the given boolean to the streams.

Overrides:

println in class PrintStream

Parameters:

x - the object to print

println

public void println(char x)

prints the given char to the streams.

Overrides:

println in class PrintStream

Parameters:

x - the object to print

println

public void println(char[] x)

prints the given char array to the streams.

Overrides:

println in class PrintStream

Parameters:

x - the object to print

println

public void println(String x)

prints the given string to the streams.

Overrides:

println in class PrintStream

Parameters:

x - the object to print

println

public void println(Object x)

prints the given object to the streams (for Throwables we print the stack trace).

Overrides:

println in class PrintStream

Parameters:

x - the object to print

write

public void write(byte[] buf,
         int off,
         int len)

Writes len bytes from the specified byte array starting at offset off to this stream. If automatic flushing is enabled then the flush method will be invoked.

Note that the bytes will be written as given; to write characters that will be translated according to the platform's default character encoding, use the print(char) or println(char) methods.

Overrides:

write in class PrintStream

Parameters:

buf - A byte array

off - Offset from which to start taking bytes

len - Number of bytes to write

write

public void write(int b)

Writes the specified byte to this stream. If the byte is a newline and automatic flushing is enabled then the flush method will be invoked.

Note that the byte is written as given; to write a character that will be translated according to the platform's default character encoding, use the print(char) or println(char) methods.

Overrides:

write in class PrintStream

Parameters:

b - The byte to be written

See Also:

print(char), println(char)

toString

public String toString()

returns only the classname and the number of streams.

Overrides:

toString in class Object

Returns:

only the classname and the number of streams

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision