src/noarch/Stream.cpp (7dc3e85) - Blinker · BlinkenArea

Stream.cpp

/* Blinker
   Copyright 2011 Stefan Schuermans <stefan@blinkenarea.org>
   Copyleft GNU public license - http://www.gnu.org/copyleft/gpl.html
   a blinkenarea.org project */

#include <set>

#include <BlinkenLib/BlinkenFrame.h>

#include "Stream.h"
#include "StreamRecv.h"

namespace Blinker {

/// constructor
Stream::Stream():
  m_pFrame(NULL)
{
}

/// virtual destructor
Stream::~Stream()
{
  // free current frame
  if (m_pFrame)
    BlinkenFrameFree(m_pFrame);
}

/**
 * @brief attach a stream receiver
 * @param[in] recv stream receiver to attach
 */
void Stream::attach(StreamRecv *recv)
{
  m_recvs.insert(recv);

// send current frame to receiver
  if (m_pFrame)
    recv->setFrame(m_name, m_pFrame);
  else
    recv->setNoFrame(m_name);
}

/**
 * @brief detach a stream receiver
 * @param[in] recv stream receiver to detach
 */
void Stream::detach(StreamRecv *recv)
{
  m_recvs.erase(recv);
}

/**
 * @brief set current frame
 * @param[in] pFrame current frame
 */
void Stream::setFrame(stBlinkenFrame *pFrame)
{
  // leave if frame is already set to an identical one
  if (m_pFrame && !BlinkenFrameCompare(pFrame, m_pFrame))
    return;

// update local copy of current frame
  if (m_pFrame)
    BlinkenFrameFree(m_pFrame);
  m_pFrame = BlinkenFrameClone(pFrame);
  if (!m_pFrame)
    return; // out of memory: do not pass NULL pointer to receivers

// pass frame to all receivers
  Recvs::iterator it;
  for (it = m_recvs.begin(); it != m_recvs.end(); ++it)
    (*it)->setFrame(m_name, m_pFrame);
}

/// set current frame to none
void Stream::setNoFrame()
{
  // leave if frame is already set to none
  if (!m_pFrame)
    return;

// set current frame to none
  if (m_pFrame) {
    BlinkenFrameFree(m_pFrame);
    m_pFrame = NULL;
  }

// pass "no frame" to all receivers
  Recvs::iterator it;
  for (it = m_recvs.begin(); it != m_recvs.end(); ++it)
    (*it)->setNoFrame(m_name);
}

/**
 * @brief get current frame
 * @param[out] pFrame current frame
 * @return if a current frame exists
 */
bool Stream::getCurFrame(stBlinkenFrame *&pFrame)
{
  pFrame = m_pFrame;
  return m_pFrame;
}

} // namespace Blinker

Blinker

avoid passing on same frame multiple times in a row