Package groovy.ui

Class SystemOutputInterceptor

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

groovy.ui.SystemOutputInterceptor

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

public class SystemOutputInterceptor
extends FilterOutputStream

Intercepts System.out/System.err. Implementation helper for Console.groovy.

Field Summary

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

Constructors

Constructor	Description
SystemOutputInterceptor(Closure callback)	Constructor
SystemOutputInterceptor(Closure callback, boolean output)	Constructor

Method Summary

Modifier and Type	Method	Description
void	removeConsoleId()	Threads executing a script should call this method after execution completes in order to unregister the consoleId.
void	setConsoleId(int consoleId)	Threads executing a script should call this method at the start of execution in order to set the id of the console that is hosting the thread of execution.
void	start()	Starts intercepting System.out/System.err
void	stop()	Stops intercepting System.out/System.err, sending output to wherever it was going when this interceptor was created.
void	write(byte[] b, int off, int len)	Intercepts output - more common case of byte[]
void	write(int b)	Intercepts output - single characters

Methods inherited from class java.io.FilterOutputStream

close, flush, write

Methods inherited from class java.io.OutputStream

nullOutputStream

Methods inherited from class java.lang.Object

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

Constructor Detail

SystemOutputInterceptor

public SystemOutputInterceptor(Closure callback)

Constructor

Parameters:

callback - accepts the id of the target Console instance and a string to be sent to std out and returns a Boolean. If the return value is true, output will be sent to System.out, otherwise it will not.

SystemOutputInterceptor

public SystemOutputInterceptor(Closure callback,
                               boolean output)

Constructor

Parameters:

callback - accepts the id of the target Console instance and a string to be sent to std out and returns a Boolean. If the return value is true, output will be sent to System.out/System.err, otherwise it will not.

output - flag that tells whether System.out needs capturing ot System.err

Method Detail

start

public void start()

Starts intercepting System.out/System.err

stop

public void stop()

Stops intercepting System.out/System.err, sending output to wherever it was going when this interceptor was created.

write

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

Intercepts output - more common case of byte[]

Overrides:

write in class FilterOutputStream

Throws:

IOException

write

public void write(int b)
           throws IOException

Intercepts output - single characters

Overrides:

write in class FilterOutputStream

Throws:

IOException

setConsoleId

public void setConsoleId(int consoleId)

Threads executing a script should call this method at the start of execution in order to set the id of the console that is hosting the thread of execution. This should be called prior to any output that is generated. The consoleId will be passed to the callback.

Parameters:

consoleId - id of the Console instance executing the script

removeConsoleId

public void removeConsoleId()

Threads executing a script should call this method after execution completes in order to unregister the consoleId.