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Class ncsa.horizon.util.MultiPrintWriter

java.lang.Object
  |
  +--java.io.Writer
        |
        +--java.io.PrintWriter
              |
              +--ncsa.horizon.util.MultiPrintWriter

public class MultiPrintWriter

extends java.io.PrintWriter

a PrintWriter that passes text to multiple writers

This class provides a single target for messages that are to go to multiple output streams. For example, one might want error messages to go to both the terminal screen and a log file. By default, no streams are attached so messages sent to this writer are just thrown away. Thus, this allows one to dynamically add and remove receiving streams without changing the code that actually writes the messages.

See Also:

MessageCenter, MessageBuffer

Field Summary

MultiPrintWriter	last
java.io.PrintWriter	mine
java.lang.String	name
MultiPrintWriter	next

Fields inherited from class java.io.PrintWriter

out

Fields inherited from class java.io.Writer

lock

Constructor Summary

MultiPrintWriter()
create an empty chain of writers

MultiPrintWriter(java.io.Writer wr)
initialize a chain of writers with a given Writer

MultiPrintWriter(java.io.Writer wr, boolean autoflush)
initialize a chain of writers with a given PrintWriter

MultiPrintWriter(java.io.PrintWriter wr)
initialize a chain of writers with a given PrintWriter

MultiPrintWriter(java.io.PrintWriter wr, boolean autoflush)
initialize a chain of writers with a given Writer

MultiPrintWriter(java.io.OutputStream os)
initialize a chain of writers with a given OutputStream

MultiPrintWriter(java.io.OutputStream os, boolean autoflush)
initialize a chain of writers with a given OutputStream

Method Summary

void	addOutput(java.io.Writer wr, boolean autoFlush) add a new Writer to this chain
void	addOutput(java.io.Writer wr) add a new Writer to this chain
void	addOutput(java.io.OutputStream os, boolean autoFlush) add a new Writer to this chain
void	addOutput(java.io.OutputStream os) add a new Writer to this chain
void	addOutput(java.io.PrintWriter wr) add a PrintWriter to this chain
boolean	checkError() Flush the streams and check their error states.
void	close() close the stream; this implementation ignores this request
boolean	contains(java.io.PrintWriter pw) return true if a given PrintWriter is in this chain
boolean	contains(java.io.Writer pw) return true if a given Writer is in this chain
boolean	contains(java.io.OutputStream pw) return true if a given OutputStream is in this chain
void	flush() flush all the streams
java.lang.String	getName() return the name of this writer or null if it is name-less
static void	main(java.lang.String[] argv)
void	println() Finish the line.
void	println(boolean x) Print a boolean, and then finish the line.
void	println(char x) Print a character, and then finish the line.
void	println(int x) Print an integer, and then finish the line.
void	println(long x) Print a long, and then finish the line.
void	println(float x) Print a float, and then finish the line.
void	println(double x) Print a double, and then finish the line.
void	println(char[] x) Print a character array, and then finish the line.
void	println(java.lang.String x) Print a boolean, and then finish the line.
void	println(java.lang.Object x) Print a boolean, and then finish the line.
void	print(boolean x) Print a boolean, and then finish the line.
void	print(char x) Print a character.
void	print(int x) Print an integer.
void	print(long x) Print a long.
void	print(float x) Print a float.
void	print(double x) Print a double.
void	print(char[] x) Print a character array.
void	print(java.lang.String x) Print a boolean.
void	print(java.lang.Object x) Print a boolean.
void	removeOutput(java.io.PrintWriter pw) remove a PrintWriter from this object
void	removeOutput(java.io.Writer pw) remove a Writer from this object
void	removeOutput(java.io.OutputStream pw) remove an OutputStream from this object
void	setName(java.lang.String name) set the name given to this writer
void	write(int c) Write a single character.
void	write(char[] buf, int off, int len) Write a portion of an array of characters.
void	write(java.lang.String s, int off, int len) Write a portion of a string.

Methods inherited from class java.io.PrintWriter

checkError, close, flush, println, println, println, println, println, println, println, println, println, println, print, print, print, print, print, print, print, print, print, setError, write, write, write, write, write

Methods inherited from class java.io.Writer

close, flush, write, write, write, write, write

Methods inherited from class java.lang.Object

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

Field Detail

last

protected MultiPrintWriter last

next

protected MultiPrintWriter next

mine

protected java.io.PrintWriter mine

name

protected java.lang.String name

Constructor Detail

MultiPrintWriter

public MultiPrintWriter()

create an empty chain of writers

MultiPrintWriter

public MultiPrintWriter(java.io.Writer wr)

initialize a chain of writers with a given Writer

MultiPrintWriter

public MultiPrintWriter(java.io.Writer wr,
                        boolean autoflush)

initialize a chain of writers with a given PrintWriter

MultiPrintWriter

public MultiPrintWriter(java.io.PrintWriter wr)

initialize a chain of writers with a given PrintWriter

MultiPrintWriter

public MultiPrintWriter(java.io.PrintWriter wr,
                        boolean autoflush)

initialize a chain of writers with a given Writer

MultiPrintWriter

public MultiPrintWriter(java.io.OutputStream os)

initialize a chain of writers with a given OutputStream

MultiPrintWriter

public MultiPrintWriter(java.io.OutputStream os,
                        boolean autoflush)

initialize a chain of writers with a given OutputStream

Method Detail

setName

public void setName(java.lang.String name)

set the name given to this writer

getName

public java.lang.String getName()

return the name of this writer or null if it is name-less

addOutput

public void addOutput(java.io.Writer wr,
                      boolean autoFlush)

add a new Writer to this chain

addOutput

public void addOutput(java.io.Writer wr)

add a new Writer to this chain

addOutput

public void addOutput(java.io.OutputStream os,
                      boolean autoFlush)

add a new Writer to this chain

addOutput

public void addOutput(java.io.OutputStream os)

add a new Writer to this chain

addOutput

public void addOutput(java.io.PrintWriter wr)

add a PrintWriter to this chain

removeOutput

public void removeOutput(java.io.PrintWriter pw)

remove a PrintWriter from this object

removeOutput

public void removeOutput(java.io.Writer pw)

remove a Writer from this object

removeOutput

public void removeOutput(java.io.OutputStream pw)

remove an OutputStream from this object

contains

public boolean contains(java.io.PrintWriter pw)

return true if a given PrintWriter is in this chain

contains

public boolean contains(java.io.Writer pw)

return true if a given Writer is in this chain

contains

public boolean contains(java.io.OutputStream pw)

return true if a given OutputStream is in this chain

checkError

public boolean checkError()

Flush the streams and check their error states. Errors are cumulative; once any stream encounters an error, this routine will return true on all successive calls.

Returns:

True if any stream has encountered an error, either on the underlying output stream or during a format conversion.

Overrides:

checkError in class java.io.PrintWriter

write

public void write(int c)

Write a single character.

Overrides:

write in class java.io.PrintWriter

write

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

Write a portion of an array of characters.

Overrides:

write in class java.io.PrintWriter

write

public void write(java.lang.String s,
                  int off,
                  int len)

Write a portion of a string.

Overrides:

write in class java.io.PrintWriter

println

public void println()

Finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(boolean x)

Print a boolean, and then finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(char x)

Print a character, and then finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(int x)

Print an integer, and then finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(long x)

Print a long, and then finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(float x)

Print a float, and then finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(double x)

Print a double, and then finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(char[] x)

Print a character array, and then finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(java.lang.String x)

Print a boolean, and then finish the line.

Overrides:

println in class java.io.PrintWriter

println

public void println(java.lang.Object x)

Print a boolean, and then finish the line.

Overrides:

println in class java.io.PrintWriter

print

public void print(boolean x)

Print a boolean, and then finish the line.

Overrides:

print in class java.io.PrintWriter

print

public void print(char x)

Print a character.

Overrides:

print in class java.io.PrintWriter

print

public void print(int x)

Print an integer.

Overrides:

print in class java.io.PrintWriter

print

public void print(long x)

Print a long.

Overrides:

print in class java.io.PrintWriter

print

public void print(float x)

Print a float.

Overrides:

print in class java.io.PrintWriter

print

public void print(double x)

Print a double.

Overrides:

print in class java.io.PrintWriter

print

public void print(char[] x)

Print a character array.

Overrides:

print in class java.io.PrintWriter

print

public void print(java.lang.String x)

Print a boolean.

Overrides:

print in class java.io.PrintWriter

print

public void print(java.lang.Object x)

Print a boolean.

Overrides:

print in class java.io.PrintWriter

flush

public void flush()

flush all the streams

Overrides:

flush in class java.io.PrintWriter

close

public void close()

close the stream; this implementation ignores this request

Overrides:

close in class java.io.PrintWriter

main

public static void main(java.lang.String[] argv)