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## org.ka2ddo.util
Class DualOutputStream

    java.lang.Object
      java.io.OutputStream
          java.io.FilterOutputStream
              org.ka2ddo.util.DualOutputStream

All Implemented Interfaces:
  java.io.Closeable, java.io.Flushable

    public class DualOutputStream

extends java.io.FilterOutputStream

This FilterOutputStream subclass directs its output to both its primary and alternate contained streams.

Field Summary

Fields inherited from class java.io.FilterOutputStream
`out`

Constructor Summary
`DualOutputStream(java.io.OutputStream out1, java.io.OutputStream out2)` Creates an output stream filter built on top of the specified two underlying output streams.

Method Summary
`void` | `close()` Closes this output stream and releases any system resources associated with the stream.
`void` | `flush()` Flushes this output stream and forces any buffered output bytes to be written out to the stream.
`void` | `write(byte[] b)` Writes `b.length` bytes to this output stream.
`void` | `write(byte[] b, int off, int len)` Writes `len` bytes from the specified `byte` array starting at offset `off` to this output stream.
`void` | `write(int b)` Writes the specified `byte` to this output stream.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DualOutputStream

    public DualOutputStream(java.io.OutputStream out1,
                            java.io.OutputStream out2)

  Creates an output stream filter built on top of the specified two underlying output streams.

  Parameters:
    `out1` - the underlying output stream to be assigned to the field `this.out` for later use, or `null` if this instance is to be created without an underlying stream.
    `out2` - the second output stream which should get a copy of all bytes written to this stream.

Method Detail

### write

    public void write(int b)
               throws java.io.IOException

  Writes the specified `byte` to this output stream.

  The `write` method of `FilterOutputStream` calls the `write` method of its underlying output stream, that is, it performs `out.write(b)`.

  Overrides:
    `write` in class `java.io.FilterOutputStream`
  Parameters:
    `b` - the `byte`.
  Throws:
    `java.io.IOException` - if an I/O error occurs.

### write

    public void write(byte[] b)
               throws java.io.IOException

  Writes `b.length` bytes to this output stream.

  The `write` method of `DualOutputStream` calls its `write` method of three arguments with the arguments `b`, `0`, and `b.length`.

  Overrides:
    `write` in class `java.io.FilterOutputStream`
  Parameters:
    `b` - the data to be written.
  Throws:
    `java.io.IOException` - if an I/O error occurs.
  See Also:
    `FilterOutputStream.write(byte[], int, int)`

### write

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

  Writes `len` bytes from the specified `byte` array starting at offset `off` to this output stream.

  Overrides:
    `write` in class `java.io.FilterOutputStream`
  Parameters:
    `b` - the data.
    `off` - the start offset in the data.
    `len` - the number of bytes to write.
  Throws:
    `java.io.IOException` - if an I/O error occurs.
  See Also:
    `FilterOutputStream.write(int)`

### flush

    public void flush()
               throws java.io.IOException

  Flushes this output stream and forces any buffered output bytes to be written out to the stream.

  The `flush` method of `DualOutputStream` calls the `flush` method of its underlying output streams.

  Specified by:
    `flush` in interface `java.io.Flushable`
  Overrides:
    `flush` in class `java.io.FilterOutputStream`
  Throws:
    `java.io.IOException` - if an I/O error occurs.
  See Also:
    `FilterOutputStream.out`

### close

    public void close()
               throws java.io.IOException

  Closes this output stream and releases any system resources associated with the stream.

  Specified by:
    `close` in interface `java.io.Closeable`
  Overrides:
    `close` in class `java.io.FilterOutputStream`
  Throws:
    `java.io.IOException` - if an I/O error occurs.
  See Also:
    `FilterOutputStream.flush()`, `FilterOutputStream.out`

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