Config.cpp

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/*

$Header$

*/

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

#include "Error.h"
#include "Parser.h"

#include "Config.h"

// Public methods.

int Config::save()
{
  String xml;
  FILE *f;
  int res;

  if (FAILED(res = _xml->root()->toString(xml)))
    return ERROR_BACKTRACE(res);

  if ((f = fopen(CONFIG_PATH, "w")) == NULL) {
    WARNING(MSG_FILE_CANNOT_OPEN, CONFIG_PATH, strerror(errno));
    return OK;
  }

  fprintf(f, CSTRING(xml));

  if (fclose(f) != 0)
    return ERROR(MSG_FILE_CANNOT_CLOSE, CONFIG_PATH, strerror(errno));

  return OK;
}

int Config::remove(const String &name)
{
  XmlElement *element;
  int res;

  if (FAILED(res = _xml->getElementById(name, &element)))
    return ERROR_BACKTRACE(res);

  if (FAILED(res = _xml->removeElement(element)))
    return ERROR_BACKTRACE(res);

  return OK;
}

// Private methods.

Config::Config() : Object(), Singleton<Config>(),
  _xml(NULL)
{
  CHECK_PARENT;

  int res;

  if (!(_xml = new XmlDocument())) {
    failure(ERROR(MSG_OBJECT_CANNOT_CREATE, "XmlDocument"));
    return;
  }
  if (FAILED(res = _xml->failureCode())) {
    failure(ERROR_BACKTRACE(res));
    return;
  }

  int f;
  int bytesRead;
  char buff[LIMIT_CSTRING_SIZE];

  if (!(f = open(CONFIG_PATH, O_RDONLY))) {
    WARNING(MSG_FILE_CANNOT_OPEN, CONFIG_PATH, strerror(errno));
    return;
  }

  while (true) {
    if ((bytesRead = read(f, (void *)buff, LIMIT_CSTRING_SIZE - 1)) < 0) {
      failure(ERROR(MSG_FILE_CANNOT_READ, CONFIG_PATH, strerror(errno)));
      break;
    } else
        if (FAILED(res = _xml->parse(buff, bytesRead, bytesRead == 0))) {
          ERROR_BACKTRACE(res);
          if (FAILED(res = _xml->reset())) {
            ERROR_BACKTRACE(res);
            return;
          }
          break;
        }
    if (bytesRead == 0)
      break;
  }

  if (close(f) < 0) {
    failure(ERROR(MSG_FILE_CANNOT_CLOSE, CONFIG_PATH, strerror(errno)));
    return;
  }

#ifdef DEBUG_MODE
  print();
#endif
}

Config::~Config()
{
  if (_xml)
    delete _xml;
}

// Private methods.

#ifdef DEBUG_MODE

int Config::print() const
{
  if (_xml && _xml->root()) {
    String xml;
    int res;

    if (FAILED(res = _xml->root()->toString(xml)))
      return ERROR_BACKTRACE(res);

    DEBUG("PYLON configuration");
    DEBUG("===================");
    DEBUG("%s%s", String::eol(), CSTRING(xml));
    DEBUG("===================");
  }
  return OK;
}

#endif

---