/**
* AP_EventEncoder_Functions
*
* Table of client visible functions exported by the encoder part of a
* codec library instance. These functions declare the only operations
* that may be performed by users of an encoder.
*
* Note that all of these functions take an initial AP_EventEncoder*
* argument; this is analogous to the (hidden) 'this' pointer passed to
* a C++ object when a member function is invoked on it.
*/
struct AP_EventEncoder_Functions {
  /**
  * sendNormalisedEvent
*
* Called by the Semantic Mapper to encode an event and send it on to the
* event transport. Ownership of the message is transferred to the
* encoder when this function is called.
*
* @param encoder The event encoder instance
* @param event The event to be encoded
* @param timeStamp Timestamps associated with this event
* @return Event codec error code. If this is not AP_EventCodec_OK, the
* getLastError() function of the encoder should be called to get a more
* detailed description of what went wrong.
  */
  AP_EventCodecError (*sendNormalisedEvent)(struct AP_EventEncoder* encoder,
    AP_NormalisedEvent* event, AP_TimestampSet* timeStamp);
  /**
  * flushUpstream
*
* Flush any pending normalized events into the attached event transport.
* If event processing in the encoder is synchronous (as it usually will
* be) this function need not do anything except return AP_EventCodec_OK.
*
* @param encoder The event encoder instance
* @return Event codec error code. If this is not AP_EventCodec_OK, the
* getLastError() function of the encoder should be called to get a more
* detailed description of what went wrong.
  */
  AP_EventCodecError (*flushUpstream)(struct AP_EventEncoder* encoder);
  /**
  * getLastError
*
* Return the encoder's stored error message, if any. The message string
* is owned by the encoder so should not be modified or freed by the
* caller.
*
* @param encoder The event encoder instance
* @return The last error message generated by the encoder
  */
  const AP_char8* (*getLastError)(struct AP_EventEncoder* encoder);
  /**
  * addEventTransport
*
* Add a named event transport to the set of transports known to the
* encoder.
*
* If the named transport already exists, it should be replaced.
*
* @param encoder The event encoder instance
* @param name The name of the transport to be added.
* @param transport The transport object itself
*/
  */
  void (*addEventTransport)(struct AP_EventEncoder* encoder,
    const AP_char8* name, struct AP_EventTransport* transport);
  /**
  * removeEventTransport
*
* Remove a named event transport from the set of transports known to the
* encoder.
*
* If the named transport does not exist, the function should do nothing.
*
* @param encoder The event encoder instance
* @param name The name of the transport to be removed
  */
  void (*removeEventTransport)(struct AP_EventEncoder* encoder,
    const AP_char8* name);
};

/**
* Function table for the AP_EventEncoder interface. The address of this
* structure will be placed in the 'functions' field of the embedded
* AP_EventEncoder object.
*/
static struct AP_EventEncoder_Functions EventEncoder_Functions = {
  sendNormalisedEvent,
  flushUpstream,
  getLastErrorEncoder,
  addEventTransport,
  removeEventTransport
};