StreamPumper (Apache Ant API)
Date: 2018-03-24

org.apache.tools.ant.taskdefs

## Class StreamPumper

- java.lang.Object
- - org.apache.tools.ant.taskdefs.StreamPumper

- All Implemented Interfaces:
    java.lang.Runnable

      public class StreamPumper
      extends java.lang.Object
      implements java.lang.Runnable

  Copies all data from an input stream to an output stream.
  Since:
    Ant 1.2

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `StreamPumper(java.io.InputStream is, java.io.OutputStream os)` Create a new StreamPumper.
    `StreamPumper(java.io.InputStream is, java.io.OutputStream os, boolean closeWhenExhausted)` Create a new StreamPumper.
    `StreamPumper(java.io.InputStream is, java.io.OutputStream os, boolean closeWhenExhausted, boolean useAvailable)` Create a new StreamPumper.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getBufferSize()` Get the size in bytes of the read buffer.
    `java.lang.Exception` | `getException()` Get the exception encountered, if any.
    `boolean` | `isFinished()` Tells whether the end of the stream has been reached.
    `void` | `run()` Copies data from the input stream to the output stream.
    `void` | `setBufferSize(int bufferSize)` Set the size in bytes of the read buffer.
    `void` | `waitFor()` This method blocks until the StreamPumper finishes.

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

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

- - ### Constructor Detail

    - #### StreamPumper

          public StreamPumper(java.io.InputStream is,
                              java.io.OutputStream os,
                              boolean closeWhenExhausted)

      Create a new StreamPumper.
      Parameters:
        `is` - input stream to read data from
        `os` - output stream to write data to.
        `closeWhenExhausted` - if true, the output stream will be closed when the input is exhausted.

    - #### StreamPumper

          public StreamPumper(java.io.InputStream is,
                              java.io.OutputStream os,
                              boolean closeWhenExhausted,
                              boolean useAvailable)

      Create a new StreamPumper.

      Note: If you set useAvailable to true, you must explicitly invoke `stop` or interrupt the corresponding Thread when you are done or the run method will never finish on some JVMs (namely those where available returns 0 on a closed stream). Setting it to true may also impact performance negatively. This flag should only be set to true if you intend to stop the pumper before the input stream gets closed.

      Parameters:
        `is` - input stream to read data from
        `os` - output stream to write data to.
        `closeWhenExhausted` - if true, the output stream will be closed when the input is exhausted.
        `useAvailable` - whether the pumper should use `available` to determine whether input is ready, thus trying to emulate non-blocking behavior.
      Since:
        Ant 1.8.0

    - #### StreamPumper

          public StreamPumper(java.io.InputStream is,
                              java.io.OutputStream os)

      Create a new StreamPumper.
      Parameters:
        `is` - input stream to read data from
        `os` - output stream to write data to.

  - ### Method Detail

    - #### run

          public void run()

      Copies data from the input stream to the output stream. Terminates as soon as the input stream is closed or an error occurs.
      Specified by:
        `run` in interface `java.lang.Runnable`

    - #### isFinished

          public boolean isFinished()

      Tells whether the end of the stream has been reached.
      Returns:
        true is the stream has been exhausted.

    - #### waitFor

          public void waitFor()
                       throws java.lang.InterruptedException

      This method blocks until the StreamPumper finishes.
      Throws:
        `java.lang.InterruptedException` - if interrupted.
      See Also:
        `isFinished()`

    - #### setBufferSize

          public void setBufferSize(int bufferSize)

      Set the size in bytes of the read buffer.
      Parameters:
        `bufferSize` - the buffer size to use.
      Throws:
        `java.lang.IllegalStateException` - if the StreamPumper is already running.

    - #### getBufferSize

          public int getBufferSize()

      Get the size in bytes of the read buffer.
      Returns:
        the int size of the read buffer.

    - #### getException

          public java.lang.Exception getException()

      Get the exception encountered, if any.
      Returns:
        the Exception encountered.