org.apache.commons.net.io

## Class DotTerminatedMessageWriter

- java.lang.Object
- - java.io.Writer
  - - org.apache.commons.net.io.DotTerminatedMessageWriter

- All Implemented Interfaces:
    Closeable, Flushable, Appendable, AutoCloseable

      public final class DotTerminatedMessageWriter
      extends Writer

  DotTerminatedMessageWriter is a class used to write messages to a server that are terminated by a single dot followed by a <CR><LF> sequence and with double dots appearing at the begining of lines which do not signal end of message yet start with a dot. Various Internet protocols such as NNTP and POP3 produce messages of this type.

  This class handles the doubling of line-starting periods, converts single linefeeds to NETASCII newlines, and on closing will send the final message terminator dot and NETASCII newline sequence.

- - ### Field Summary

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

      `lock`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DotTerminatedMessageWriter(Writer output)` Creates a DotTerminatedMessageWriter that wraps an existing Writer output destination.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()` Flushes the underlying output, writing all buffered output, but doesn't actually close the underlying stream.
    `void` | `flush()` Flushes the underlying output, writing all buffered output.
    `void` | `write(char[] buffer)` Writes a character array to the output.
    `void` | `write(char[] buffer, int offset, int length)` Writes a number of characters from a character array to the output starting from a given offset.
    `void` | `write(int ch)` Writes a character to the output.
    `void` | `write(String string)` Writes a String to the output.
    `void` | `write(String string, int offset, int length)` Writes part of a String to the output starting from a given offset.

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

      `append, append, append`

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

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

- - ### Constructor Detail

    - #### DotTerminatedMessageWriter

          public DotTerminatedMessageWriter(Writer output)

      Creates a DotTerminatedMessageWriter that wraps an existing Writer output destination.
      Parameters:
        `output` - The Writer output destination to write the message.

  - ### Method Detail

    - #### write

          public void write(int ch)
                     throws IOException

      Writes a character to the output. Note that a call to this method may result in multiple writes to the underling Writer in order to convert naked linefeeds to NETASCII line separators and to double line-leading periods. This is transparent to the programmer and is only mentioned for completeness.
      Overrides:
        `write` in class `Writer`
      Parameters:
        `ch` - The character to write.
      Throws:
        `IOException` - If an error occurs while writing to the underlying output.

    - #### write

          public void write(char[] buffer,
                   int offset,
                   int length)
                     throws IOException

      Writes a number of characters from a character array to the output starting from a given offset.
      Specified by:
        `write` in class `Writer`
      Parameters:
        `buffer` - The character array to write.
        `offset` - The offset into the array at which to start copying data.
        `length` - The number of characters to write.
      Throws:
        `IOException` - If an error occurs while writing to the underlying output.

    - #### write

          public void write(char[] buffer)
                     throws IOException

      Writes a character array to the output.
      Overrides:
        `write` in class `Writer`
      Parameters:
        `buffer` - The character array to write.
      Throws:
        `IOException` - If an error occurs while writing to the underlying output.

    - #### write

          public void write(String string)
                     throws IOException

      Writes a String to the output.
      Overrides:
        `write` in class `Writer`
      Parameters:
        `string` - The String to write.
      Throws:
        `IOException` - If an error occurs while writing to the underlying output.

    - #### write

          public void write(String string,
                   int offset,
                   int length)
                     throws IOException

      Writes part of a String to the output starting from a given offset.
      Overrides:
        `write` in class `Writer`
      Parameters:
        `string` - The String to write.
        `offset` - The offset into the String at which to start copying data.
        `length` - The number of characters to write.
      Throws:
        `IOException` - If an error occurs while writing to the underlying output.

    - #### flush

          public void flush()
                     throws IOException

      Flushes the underlying output, writing all buffered output.
      Specified by:
        `flush` in interface `Flushable`
      Specified by:
        `flush` in class `Writer`
      Throws:
        `IOException` - If an error occurs while writing to the underlying output.

    - #### close

          public void close()
                     throws IOException

      Flushes the underlying output, writing all buffered output, but doesn't actually close the underlying stream. The underlying stream may still be used for communicating with the server and therefore is not closed.
      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Specified by:
        `close` in class `Writer`
      Throws:
        `IOException` - If an error occurs while writing to the underlying output or closing the Writer.

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