ij.io

Class LogStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

java.io.PrintStream

ij.io.LogStream

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

public class LogStream
extends PrintStream

This class provides the functionality to divert output sent to the System.out and System.err streams to ImageJ's log console. The purpose is to allow use of existing Java classes or writing new generic Java classes that only output to System.out and are thus less dependent on ImageJ. See the ImageJ plugin Redirect_System_Streams at http://staff.fh-hagenberg.at/burger/imagej/ for usage examples.

Author:

Wilhelm Burger (wilbur at ieee.org) See Also: Redirect_System_Streams (http://staff.fh-hagenberg.at/burger/imagej/)

Field Summary

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

Constructors

Constructor and Description
LogStream()

Method Summary

Modifier and Type	Method and Description
void	close()
void	flush()
static PrintStream	getCurrentErrStream() Returns the redirection stream for System.err if it exists.
static PrintStream	getCurrentOutStream() Returns the redirection stream for System.out if it exists.
static void	redirectSystem() Redirects all output sent to System.out and System.err to ImageJ's log console using the default prefixes.
static void	redirectSystem(boolean redirect) Redirects all output sent to System.out and System.err to ImageJ's log console using the default prefixes.
static void	redirectSystemErr(String prefix) Redirects all output sent to System.err to ImageJ's log console.
static void	redirectSystemOut(String prefix) Redirects all output sent to System.out to ImageJ's log console.
static void	revertSystem() Use this method to revert both System.out and System.err to their original output streams.
static void	revertSystemErr() Use this method to revertSystem.err to the original output stream.
static void	revertSystemOut() Use this method to revertSystem.out to the original output stream.
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)

Methods inherited from class java.io.PrintStream

append, append, append, checkError, clearError, format, format, print, print, print, print, print, print, print, print, print, printf, printf, println, println, println, println, println, println, println, println, println, println, setError

Methods inherited from class java.lang.Object

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

Constructor Detail

LogStream

public LogStream()

Method Detail

redirectSystem

public static void redirectSystem(boolean redirect)

Redirects all output sent to System.out and System.err to ImageJ's log console using the default prefixes.

redirectSystem

public static void redirectSystem()

Redirects all output sent to System.out and System.err to ImageJ's log console using the default prefixes. Alternatively use redirectSystemOut(String) and redirectSystemErr(String) to redirect the streams separately and to specify individual prefixes.

redirectSystemOut

public static void redirectSystemOut(String prefix)

Redirects all output sent to System.out to ImageJ's log console.

Parameters:

prefix - The prefix string inserted at the start of each output line. Pass null to use the default prefix or an empty string to remove the prefix.

redirectSystemErr

public static void redirectSystemErr(String prefix)

Redirects all output sent to System.err to ImageJ's log console.

Parameters:

prefix - The prefix string inserted at the start of each output line. Pass null to use the default prefix or an empty string to remove the prefix.

getCurrentOutStream

public static PrintStream getCurrentOutStream()

Returns the redirection stream for System.out if it exists. Note that a reference to the current output stream can also be obtained directly from the System.out field.

Returns:

A reference to the PrintStream object currently substituting System.out or null of if System.out is currently not redirected.

getCurrentErrStream

public static PrintStream getCurrentErrStream()

Returns the redirection stream for System.err if it exists. Note that a reference to the current output stream can also be obtained directly from the System.err field.

Returns:

A reference to the PrintStream object currently substituting System.err or null of if System.err is currently not redirected.

revertSystem

public static void revertSystem()

Use this method to revert both System.out and System.err to their original output streams.

revertSystemOut

public static void revertSystemOut()

Use this method to revertSystem.out to the original output stream.

revertSystemErr

public static void revertSystemErr()

Use this method to revertSystem.err to the original output stream.

write

public void write(byte[] b)

Overrides:

write in class FilterOutputStream

write

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

Overrides:

write in class PrintStream

write

public void write(int b)

Overrides:

write in class PrintStream

flush

public void flush()

Specified by:

flush in interface Flushable

Overrides:

flush in class PrintStream

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class PrintStream