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FileOutputStream is for writing to a file; BufferOutputStream writes to a buffer; You can create one and pass it to any of the table writers, for example.


The $create() factory methods instantiate the OutputStream object and take the following arguments, depending on the subclass:

  • path For FileOutputStream, a character file name

  • initial_capacity For BufferOutputStream, the size in bytes of the buffer.


  • $tell(): return the position in the stream

  • $close(): close the stream

  • $write(x): send x to the stream

  • $capacity(): for BufferOutputStream

  • $finish(): for BufferOutputStream

  • $GetExtentBytesWritten(): for MockOutputStream, report how many bytes were sent.