org.apache.tools.ant.util

## Class KeepAliveOutputStream

- java.lang.Object
- - java.io.OutputStream
  - - java.io.FilterOutputStream
    - - org.apache.tools.ant.util.KeepAliveOutputStream

- All Implemented Interfaces:
    java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

      public class KeepAliveOutputStream
      extends java.io.FilterOutputStream

  Class that can be used to wrap `System.out` and `System.err` without getting anxious about any client closing the stream.

  In code-language it means that it is not necessary to do:

       if (out != System.out && out != System.err) {
         out.close();
       }

- - ### Field Summary

    - ### Fields inherited from class java.io.FilterOutputStream

      `out`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `KeepAliveOutputStream(java.io.OutputStream out)` Constructor of KeepAliveOutputStream.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()` This method does nothing.
    `static java.io.PrintStream` | `wrapSystemErr()` Convenience factory method that returns a non-closing PrintStream around System.err.
    `static java.io.PrintStream` | `wrapSystemOut()` Convenience factory method that returns a non-closing PrintStream around System.out.

    - ### Methods inherited from class java.io.FilterOutputStream

      `flush, write, write, write`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### KeepAliveOutputStream

          public KeepAliveOutputStream(java.io.OutputStream out)

      Constructor of KeepAliveOutputStream.
      Parameters:
        `out` - an OutputStream value, it should be standard output.

  - ### Method Detail

    - #### close

          public void close()
                     throws java.io.IOException

      This method does nothing.
      Specified by:
        `close` in interface `java.io.Closeable`
      Specified by:
        `close` in interface `java.lang.AutoCloseable`
      Overrides:
        `close` in class `java.io.FilterOutputStream`
      Throws:
        `java.io.IOException` - as we are overriding FilterOutputStream.

    - #### wrapSystemOut

          public static java.io.PrintStream wrapSystemOut()

      Convenience factory method that returns a non-closing PrintStream around System.out.
      Returns:
        PrintStream
      Since:
        Ant 1.8.0

    - #### wrapSystemErr

          public static java.io.PrintStream wrapSystemErr()

      Convenience factory method that returns a non-closing PrintStream around System.err.
      Returns:
        PrintStream
      Since:
        Ant 1.8.0