config.cxx

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  if (PFile::Exists(filename))
    return PTrue;

  // otherwise check the system directory for a file to read,
  // and then create 
  readFilename = SYS_CONFIG_DIR + baseName + EXTENSION;
  return PFile::Exists(readFilename);
}

///////////////////////////////////////////////////////////////////////////////

PString PProcess::GetConfigurationFile()
{
  if (configurationPaths.IsEmpty()) {
    configurationPaths.AppendString(PXGetHomeDir() + APP_CONFIG_DIR);
    configurationPaths.AppendString(SYS_CONFIG_DIR);
  }

  // See if explicit filename
  if (configurationPaths.GetSize() == 1 && !PDirectory::Exists(configurationPaths[0]))
    return configurationPaths[0];

  PString iniFilename = executableFile.GetTitle() + ".ini";

  for (PINDEX i = 0; i < configurationPaths.GetSize(); i++) {
    PFilePath cfgFile = PDirectory(configurationPaths[i]) + iniFilename;
    if (PFile::Exists(cfgFile))
      return cfgFile;
  }

  return PDirectory(configurationPaths[0]) + iniFilename;
}


////////////////////////////////////////////////////////////
//
// PXConfigDictionary
//

PXConfigDictionary::PXConfigDictionary(int)
{
  environmentInstance = NULL;
  writeThread = NULL;
  configDict = this;
}


PXConfigDictionary::~PXConfigDictionary()
{
  if (writeThread != NULL) {
    stopConfigWriteThread.Signal();
    writeThread->WaitForTermination();
    delete writeThread;
  }
  delete environmentInstance;
}


PXConfig * PXConfigDictionary::GetEnvironmentInstance()
{
  mutex.Wait();
  if (environmentInstance == NULL) {
    environmentInstance = new PXConfig(0);
    environmentInstance->ReadFromEnvironment(PProcess::Current().PXGetEnvp());
  }
  mutex.Signal();
  return environmentInstance;
}


PXConfig * PXConfigDictionary::GetFileConfigInstance(const PFilePath & key, const PFilePath & readKey)
{
  mutex.Wait();

  // start write thread, if not already started
  if (writeThread == NULL)
    writeThread = new PXConfigWriteThread(stopConfigWriteThread);

  PXConfig * config = GetAt(key);
  if (config != NULL) 
    config->AddInstance();
  else {
    config = new PXConfig(0);
    config->ReadFromFile(readKey);
    config->AddInstance();
    SetAt(key, config);
  }

  mutex.Signal();
  return config;
}

void PXConfigDictionary::RemoveInstance(PXConfig * instance)
{
  mutex.Wait();

  if (instance != environmentInstance) {
    PINDEX index = GetObjectsIndex(instance);
    PAssert(index != P_MAX_INDEX, "Cannot find PXConfig instance to remove");

    // decrement the instance count, but don't remove it yet
    PFilePath key = GetKeyAt(index);
    instance->RemoveInstance(key);
  }

  mutex.Signal();
}

void PXConfigDictionary::WriteChangedInstances()
{
  mutex.Wait();

  PINDEX i;
  for (i = 0; i < GetSize(); i++) {
    PFilePath key = GetKeyAt(i);
    GetAt(key)->Flush(key);
  }

  mutex.Signal();
}

////////////////////////////////////////////////////////////
//
// PConfig::
//
// Create a new configuration object
//
////////////////////////////////////////////////////////////

void PConfig::Construct(Source src,
                        const PString & appname,
                        const PString & /*manuf*/)
{
  // handle cnvironment configs differently
  if (src == PConfig::Environment)  {
    config = configDict->GetEnvironmentInstance();
    return;
  }
  
  PString name;
  PFilePath filename, readFilename;
  
  // look up file name to read, and write
  if (src == PConfig::System)
    LocateFile(SYS_CONFIG_NAME, readFilename, filename);
  else
    filename = readFilename = PProcess::Current().GetConfigurationFile();

  // get, or create, the configuration
  config = configDict->GetFileConfigInstance(filename, readFilename);
}

PConfig::PConfig(int, const PString & name)
  : defaultSection("Options")
{
  PFilePath readFilename, filename;
  LocateFile(name, readFilename, filename);
  config = configDict->GetFileConfigInstance(filename, readFilename);
}

void PConfig::Construct(const PFilePath & theFilename)

{
  config = configDict->GetFileConfigInstance(theFilename, theFilename);
}

PConfig::~PConfig()

{
  configDict->RemoveInstance(config);
}

////////////////////////////////////////////////////////////
//
// PConfig::
//
// Return a list of all the section names in the file.
//
////////////////////////////////////////////////////////////

PStringArray PConfig::GetSections() const
{
  PAssert(config != NULL, "config instance not set");
  config->Wait();

  PINDEX sz = config->GetSize();
  PStringArray sections(sz);

  for (PINDEX i = 0; i < sz; i++)
    sections[i] = (*config)[i];

  config->Signal();

  return sections;
}


////////////////////////////////////////////////////////////
//
// PConfig::
//
// Return a list of all the keys in the section. If the section name is
// not specified then use the default section.
//
////////////////////////////////////////////////////////////

PStringArray PConfig::GetKeys(const PString & theSection) const
{
  PAssert(config != NULL, "config instance not set");
  config->Wait();

  PINDEX index;
  PStringArray keys;

  if ((index = config->GetSectionsIndex(theSection)) != P_MAX_INDEX) {
    PXConfigSectionList & section = (*config)[index].GetList();
    keys.SetSize(section.GetSize());
    for (PINDEX i = 0; i < section.GetSize(); i++)
      keys[i] = section[i];
  }

  config->Signal();
  return keys;
}



////////////////////////////////////////////////////////////
//
// PConfig::
//
// Delete all variables in the specified section. If the section name is
// not specified then use the default section.
//
////////////////////////////////////////////////////////////

void PConfig::DeleteSection(const PString & theSection)
{
  PAssert(config != NULL, "config instance not set");
  config->Wait();

  PINDEX index;
  if ((index = config->GetSectionsIndex(theSection)) != P_MAX_INDEX) {
    config->RemoveAt(index);
    config->SetDirty();
  }

  config->Signal();
}


////////////////////////////////////////////////////////////
//
// PConfig::
//
// Delete the particular variable in the specified section.
//
////////////////////////////////////////////////////////////

void PConfig::DeleteKey(const PString & theSection, const PString & theKey)
{
  PAssert(config != NULL, "config instance not set");
  config->Wait();

  PINDEX index;
  if ((index = config->GetSectionsIndex(theSection)) != P_MAX_INDEX) {
    PXConfigSectionList & section = (*config)[index].GetList();
    PINDEX index_2;
    if ((index_2 = section.GetValuesIndex(theKey)) != P_MAX_INDEX) {
      section.RemoveAt(index_2);
      config->SetDirty();
    }
  }

  config->Signal();
}



////////////////////////////////////////////////////////////
//
// PConfig::
//
// Test if there is a value for the key.
//
////////////////////////////////////////////////////////////

PBoolean PConfig::HasKey(const PString & theSection, const PString & theKey) const
{
  PAssert(config != NULL, "config instance not set");
  config->Wait();

  PBoolean present = PFalse;
  PINDEX index;
  if ((index = config->GetSectionsIndex(theSection)) != P_MAX_INDEX) {
    PXConfigSectionList & section = (*config)[index].GetList();
    present = section.GetValuesIndex(theKey) != P_MAX_INDEX;
  }

  config->Signal();
  return present;
}



////////////////////////////////////////////////////////////
//
// PConfig::
//
// Get a string variable determined by the key in the section.
//
////////////////////////////////////////////////////////////

PString PConfig::GetString(const PString & theSection,
                                    const PString & theKey, const PString & dflt) const
{
  PAssert(config != NULL, "config instance not set");
  config->Wait();

  PString value = dflt;
  PINDEX index;
  if ((index = config->GetSectionsIndex(theSection)) != P_MAX_INDEX) {

    PXConfigSectionList & section = (*config)[index].GetList();
    if ((index = section.GetValuesIndex(theKey)) != P_MAX_INDEX) 
      value = section[index].GetValue();
  }

  config->Signal();
  return value;
}


////////////////////////////////////////////////////////////
//
// PConfig::
//
// Set a string variable determined by the key in the section.
//
////////////////////////////////////////////////////////////

void PConfig::SetString(const PString & theSection,
                        const PString & theKey,
                        const PString & theValue)
{
  PAssert(config != NULL, "config instance not set");
  config->Wait();

  PINDEX index;
  PXConfigSection * section;
  PXConfigValue   * value;

  if ((index = config->GetSectionsIndex(theSection)) != P_MAX_INDEX) 
    section = &(*config)[index];
  else {
    section = new PXConfigSection(theSection);
    config->Append(section);
    config->SetDirty();
  } 

  if ((index = section->GetList().GetValuesIndex(theKey)) != P_MAX_INDEX) 
    value = &(section->GetList()[index]);
  else {
    value = new PXConfigValue(theKey);
    section->GetList().Append(value);
    config->SetDirty();
  }

  if (theValue != value->GetValue()) {
    value->SetValue(theValue);
    config->SetDirty();
  }

  config->Signal();
}


///////////////////////////////////////////////////////////////////////////////