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

Constructor Summary

Constructors
Constructor	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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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.
`PrintStream`	`append(char c)`	Appends the specified character to this output stream.
`PrintStream`	`append(CharSequence csq)`	Appends the specified character sequence to this output stream.
`PrintStream`	`append(CharSequence csq, int start, int end)`	Appends a subsequence of the specified character sequence to this output stream.
`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.
`PrintStream`	`printf(String format, Object... args)`	A convenience method to write a formatted string to this output stream using the specified format string and arguments.
`PrintStream`	`printf(Locale l, String format, Object... args)`	A convenience method to write a formatted string to this output stream using the specified format string and arguments.
`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[] b)`	Writes `b.length` bytes to this output stream.
`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
checkError, close, format, format

Methods inherited from class java.io.OutputStream
nullOutputStream

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)
  - write
```
public void write(byte[] b)
           throws IOException
```
    Writes b.length bytes to this output stream.
    The write method of FilterOutputStream calls its write method of three arguments with the arguments b, 0, and b.length.
    Note that this method does not call the one-argument write method of its underlying output stream with the single argument b.
    
    Overrides:
    
    write in class FilterOutputStream
    
    Parameters:
    
    b - the data to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    
    See Also:
    
    FilterOutputStream.write(byte[], int, int)
  - printf
```
public PrintStream printf(String format,
                          Object... args)
```
    A convenience method to write a formatted string to this output stream using the specified format string and arguments.
    An invocation of this method of the form out.printf(format, args) behaves in exactly the same way as the invocation
    out.format(format, args)
    Overrides:
    
    printf in class PrintStream
    
    Parameters:
    
    format - A format string as described in Format string syntax
    
    args - Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java™ Virtual Machine Specification. The behaviour on a null argument depends on the conversion.
    
    Returns:
    
    This output stream
    
    Throws:
    
    IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the formatter class specification.
    
    NullPointerException - If the format is null
    
    Since:
    
    1.5
  - printf
```
public PrintStream printf(Locale l,
                          String format,
                          Object... args)
```
    A convenience method to write a formatted string to this output stream using the specified format string and arguments.
    An invocation of this method of the form out.printf(l, format, args) behaves in exactly the same way as the invocation
    out.format(l, format, args)
    Overrides:
    
    printf in class PrintStream
    
    Parameters:
    
    l - The locale to apply during formatting. If l is null then no localization is applied.
    
    format - A format string as described in Format string syntax
    
    args - Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java™ Virtual Machine Specification. The behaviour on a null argument depends on the conversion.
    
    Returns:
    
    This output stream
    
    Throws:
    
    IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the formatter class specification.
    
    NullPointerException - If the format is null
    
    Since:
    
    1.5
  - append
```
public PrintStream append(char c)
```
    Appends the specified character to this output stream.
    An invocation of this method of the form out.append(c) behaves in exactly the same way as the invocation
    out.print(c)
    Specified by:
    
    append in interface Appendable
    
    Overrides:
    
    append in class PrintStream
    
    Parameters:
    
    c - The 16-bit character to append
    
    Returns:
    
    This output stream
    
    Since:
    
    1.5
  - append
```
public PrintStream append(CharSequence csq)
```
    Appends the specified character sequence to this output stream.
    An invocation of this method of the form out.append(csq) behaves in exactly the same way as the invocation
    out.print(csq.toString())
    
    Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking then toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.
    Specified by:
    
    append in interface Appendable
    
    Overrides:
    
    append in class PrintStream
    
    Parameters:
    
    csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this output stream.
    
    Returns:
    
    This output stream
    
    Since:
    
    1.5
  - append
```
public PrintStream append(CharSequence csq,
                          int start,
                          int end)
```
    Appends a subsequence of the specified character sequence to this output stream.
    An invocation of this method of the form out.append(csq, start, end) when csq is not null, behaves in exactly the same way as the invocation
    out.print(csq.subSequence(start, end).toString())
    Specified by:
    
    append in interface Appendable
    
    Overrides:
    
    append in class PrintStream
    
    Parameters:
    
    csq - The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".
    
    start - The index of the first character in the subsequence
    
    end - The index of the character following the last character in the subsequence
    
    Returns:
    
    This output stream
    
    Throws:
    
    IndexOutOfBoundsException - If start or end are negative, start is greater than end, or end is greater than csq.length()
    
    Since:
    
    1.5
  - 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

Class Tee

Constructor Summary

Method Summary

Methods inherited from class java.io.PrintStream

Methods inherited from class java.io.OutputStream

Methods inherited from class java.lang.Object

Constructor Detail

Tee

Tee

Method Detail

clear

getDefault

add

add

add

get

remove

remove

contains

size

flush

print

print

print

print

print

print

print

print

print

println

println

println

println

println

println

println

println

println

println

write

write

write

printf

printf

append

append

append

toString

getRevision