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## org.apache.commons.net.io
Class DotTerminatedMessageReader

    java.lang.Object
      java.io.Reader
          java.io.BufferedReader
              org.apache.commons.net.io.DotTerminatedMessageReader

All Implemented Interfaces:
  Closeable, Readable

    public final class DotTerminatedMessageReader

extends BufferedReader

DotTerminatedMessageReader is a class used to read messages from 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 stripping of the duplicate period at the beginning of lines starting with a period, and ensures you cannot read past the end of the message.

Note: versions since 3.0 extend BufferedReader rather than Reader, and no longer change the CRLF into the local EOL. Also only DOT CR LF acts as EOF.

Version:
  $Id: DotTerminatedMessageReader.java 1088720 2011-04-04 18:52:00Z dfs $

Field Summary

Fields inherited from class java.io.Reader
`lock`

Constructor Summary
`DotTerminatedMessageReader(Reader reader)` Creates a DotTerminatedMessageReader that wraps an existing Reader input source.

Method Summary
`void` | `close()` Closes the message for reading.
`int` | `read()` Reads and returns the next character in the message.
`int` | `read(char[] buffer)` Reads the next characters from the message into an array and returns the number of characters read.
`int` | `read(char[] buffer, int offset, int length)` Reads the next characters from the message into an array and returns the number of characters read.
`String` | `readLine()` Read a line of text.

Methods inherited from class java.io.BufferedReader
`mark, markSupported, ready, reset, skip`

Methods inherited from class java.io.Reader
`read`

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

Constructor Detail

### DotTerminatedMessageReader

    public DotTerminatedMessageReader(Reader reader)

  Creates a DotTerminatedMessageReader that wraps an existing Reader input source.

  Parameters:
    `reader` - The Reader input source containing the message.

Method Detail

### read

    public int read()
             throws IOException

  Reads and returns the next character in the message. If the end of the message has been reached, returns -1. Note that a call to this method may result in multiple reads from the underlying input stream to decode the message properly (removing doubled dots and so on). All of this is transparent to the programmer and is only mentioned for completeness.

  Overrides:
    `read` in class `BufferedReader`
  Returns:
    The next character in the message. Returns -1 if the end of the message has been reached.
  Throws:
    `IOException` - If an error occurs while reading the underlying stream.

### read

    public int read(char[] buffer)
             throws IOException

  Reads the next characters from the message into an array and returns the number of characters read. Returns -1 if the end of the message has been reached.

  Overrides:
    `read` in class `Reader`
  Parameters:
    `buffer` - The character array in which to store the characters.
  Returns:
    The number of characters read. Returns -1 if the end of the message has been reached.
  Throws:
    `IOException` - If an error occurs in reading the underlying stream.

### read

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

  Reads the next characters from the message into an array and returns the number of characters read. Returns -1 if the end of the message has been reached. The characters are stored in the array starting from the given offset and up to the length specified.

  Overrides:
    `read` in class `BufferedReader`
  Parameters:
    `buffer` - The character array in which to store the characters.
    `offset` - The offset into the array at which to start storing characters.
    `length` - The number of characters to read.
  Returns:
    The number of characters read. Returns -1 if the end of the message has been reached.
  Throws:
    `IOException` - If an error occurs in reading the underlying stream.

### close

    public void close()
               throws IOException

  Closes the message for reading. This doesn't actually close the underlying stream. The underlying stream may still be used for communicating with the server and therefore is not closed.

  If the end of the message has not yet been reached, this method will read the remainder of the message until it reaches the end, so that the underlying stream may continue to be used properly for communicating with the server. If you do not fully read a message, you MUST close it, otherwise your program will likely hang or behave improperly.

  Specified by:
    `close` in interface `Closeable`
  Overrides:
    `close` in class `BufferedReader`
  Throws:
    `IOException` - If an error occurs while reading the underlying stream.

### readLine

    public String readLine()
                    throws IOException

  Read a line of text. A line is considered to be terminated by carriage return followed immediately by a linefeed. This contrasts with BufferedReader which also allows other combinations.

  Overrides:
    `readLine` in class `BufferedReader`
  Throws:
    `IOException`
  Since:
    3.0

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