Package groovy.console.ui

# Class SystemOutputInterceptor

java.lang.Object
java.io.OutputStream
java.io.FilterOutputStream
groovy.console.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 Details

  - ### 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 Details

  - ### 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.