src/noarch/PriorityInput.cpp (3534d9a) - Blinker · BlinkenArea

PriorityInput.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 <string>

#include <BlinkenLib/BlinkenFrame.h>

#include "Directory.h"
#include "File.h"
#include "Priority.h"
#include "PriorityInput.h"
#include "SettingFile.h"
#include "StreamMgr.h"
#include "StreamRecv.h"

namespace Blinker {

/**
 * @brief constructor
 * @param[in] priority owning priority based selector
 * @param[in] name name of input (i.e. priority)
 * @param[in] dirBase base directory
 */
Priority::Input::Input(Priority &priority, const std::string &name,
                       const Directory &dirBase):
  m_priority(priority),
  m_name(name),
  m_fileInStream(dirBase.getFile("instream")),
  m_pInStream(NULL),
  m_pFrame(NULL)
{
  // attach to input stream
  getInStream();
}

/// virtual destructor
Priority::Input::~Input()
{
  // detach from input stream and release it
  releaseInStream();
}

/// check for update of configuration
void Priority::Input::updateConfig()
{
  // input stream name file was modified -> re-get input stream
  if (m_fileInStream.checkModified()) {
    releaseInStream();
    getInStream();
  }
}

/**
 * @brief set current frame
 * @param[in] stream stream name
 * @param[in] pFrame current frame (NULL for none)
 */
void Priority::Input::setFrame(const std::string &stream, stBlinkenFrame *pFrame)
{
  frame(pFrame);
  (void)stream; // unused
}

/**
 * @brief get current frame
 * @return current frame (NULL if none)
 */
stBlinkenFrame * Priority::Input::getCurFrame()
{
  return m_pFrame;
}

/// get input stream and attach to it
void Priority::Input::getInStream()
{
  // get input stream
  m_fileInStream.getStr(m_nameInStream);
  m_pInStream = &m_priority.m_streamMgr.refStream(m_nameInStream);

// attach to input stream
  if (m_pInStream)
    m_pInStream->attach(this);

// processing of frame will happen automatically when stream sets frame
}

/// detach from input stream and release it
void Priority::Input::releaseInStream()
{
  // set current frame to none
  frame(NULL);

// detach from input stream
  if (m_pInStream)
    m_pInStream->detach(this);

// unreference stream
  m_pInStream = NULL;
  m_priority.m_streamMgr.unrefStream(m_nameInStream);
}

/**
 * @brief set current frame
 * @param[in] pFrame current frame (NULL for none)
 */
void Priority::Input::frame(stBlinkenFrame *pFrame)
{
  // save new frame
  m_pFrame = pFrame;

// there is a frame now
  if (pFrame) {

// if we are current input
    if (m_priority.m_itCurIn != m_priority.m_inList.rend() &&
        m_priority.m_itCurIn->m_pInput == this)
      // pass on frame
      m_priority.frame(pFrame);

// we have a higher priority than current input
    if (m_priority.m_itCurIn == m_priority.m_inList.rend() ||
        m_priority.m_itCurIn->m_name < m_name)
      // tell priority based selector to select us as input
      m_priority.select(this);

}
  // there is no frame
  else {

// if we are current input
    if (m_priority.m_itCurIn != m_priority.m_inList.rend() &&
        m_priority.m_itCurIn->m_pInput == this)
      // tell priority based selector to select lower priority input
      m_priority.selectLower();

}
}

} // namespace Blinker

Blinker

simplified interface of getCurFrame mehtods