regconf.cpp

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    // this is not needed any longer as we don't create keys unnecessarily any
    // more (now it is done on demand, i.e. only when they're going to contain
    // something)
#if 0
    // as we create the registry key when SetPath(key) is done, we can be left
    // with plenty of empty keys if this was only done to try to read some
    // value which, in fact, doesn't exist - to prevent this from happening we
    // automatically delete the old key if it was empty
    if ( m_keyLocal.Exists() && LocalKey().IsEmpty() )
    {
        m_keyLocal.DeleteSelf();
    }
#endif // 0

    // change current key(s)
    m_keyLocal.SetName(m_keyLocalRoot, strRegPath);

    if ( GetStyle() & wxCONFIG_USE_GLOBAL_FILE )
    {
      m_keyGlobal.SetName(m_keyGlobalRoot, strRegPath);

      wxLogNull nolog;
      m_keyGlobal.Open(wxRegKey::Read);
    }
}

// ----------------------------------------------------------------------------
// enumeration (works only with current group)
// ----------------------------------------------------------------------------

/*
  We want to enumerate all local keys/values after the global ones, but, of
  course, we don't want to repeat a key which appears locally as well as
  globally twice.

  We use the 15th bit of lIndex for distinction between global and local.
 */

#define LOCAL_MASK        0x8000
#define IS_LOCAL_INDEX(l) (((l) & LOCAL_MASK) != 0)

bool wxRegConfig::GetFirstGroup(wxString& str, long& lIndex) const
{
  lIndex = 0;
  return GetNextGroup(str, lIndex);
}

bool wxRegConfig::GetNextGroup(wxString& str, long& lIndex) const
{
  // are we already enumerating local entries?
  if ( m_keyGlobal.IsOpened() && !IS_LOCAL_INDEX(lIndex) ) {
    // try to find a global entry which doesn't appear locally
    while ( m_keyGlobal.GetNextKey(str, lIndex) ) {
      if ( !m_keyLocal.Exists() || !LocalKey().HasSubKey(str) ) {
        // ok, found one - return it
        return true;
      }
    }

    // no more global entries
    lIndex |= LOCAL_MASK;
  }

  // if we don't have the key at all, don't try to enumerate anything under it
  if ( !m_keyLocal.Exists() )
      return false;

  // much easier with local entries: get the next one we find
  // (don't forget to clear our flag bit and set it again later)
  lIndex &= ~LOCAL_MASK;
  bool bOk = LocalKey().GetNextKey(str, lIndex);
  lIndex |= LOCAL_MASK;

  return bOk;
}

bool wxRegConfig::GetFirstEntry(wxString& str, long& lIndex) const
{
  lIndex = 0;
  return GetNextEntry(str, lIndex);
}

bool wxRegConfig::GetNextEntry(wxString& str, long& lIndex) const
{
  // are we already enumerating local entries?
  if ( m_keyGlobal.IsOpened() && !IS_LOCAL_INDEX(lIndex) ) {
    // try to find a global entry which doesn't appear locally
    while ( m_keyGlobal.GetNextValue(str, lIndex) ) {
      if ( !m_keyLocal.Exists() || !LocalKey().HasValue(str) ) {
        // ok, found one - return it
        return true;
      }
    }

    // no more global entries
    lIndex |= LOCAL_MASK;
  }

  // if we don't have the key at all, don't try to enumerate anything under it
  if ( !m_keyLocal.Exists() )
      return false;

  // much easier with local entries: get the next one we find
  // (don't forget to clear our flag bit and set it again later)
  lIndex &= ~LOCAL_MASK;
  bool bOk = LocalKey().GetNextValue(str, lIndex);
  lIndex |= LOCAL_MASK;

  return bOk;
}

size_t wxRegConfig::GetNumberOfEntries(bool WXUNUSED(bRecursive)) const
{
  size_t nEntries = 0;

  // dummy vars
  wxString str;
  long l;
  bool bCont = ((wxRegConfig*)this)->GetFirstEntry(str, l);
  while ( bCont ) {
    nEntries++;

    bCont = ((wxRegConfig*)this)->GetNextEntry(str, l);
  }

  return nEntries;
}

size_t wxRegConfig::GetNumberOfGroups(bool WXUNUSED(bRecursive)) const
{
  size_t nGroups = 0;

  // dummy vars
  wxString str;
  long l;
  bool bCont = ((wxRegConfig*)this)->GetFirstGroup(str, l);
  while ( bCont ) {
    nGroups++;

    bCont = ((wxRegConfig*)this)->GetNextGroup(str, l);
  }

  return nGroups;
}

// ----------------------------------------------------------------------------
// tests for existence
// ----------------------------------------------------------------------------

bool wxRegConfig::HasGroup(const wxString& key) const
{
    wxConfigPathChanger path(this, key);

    wxString strName(path.Name());

    return (m_keyLocal.Exists() && LocalKey().HasSubKey(strName)) ||
           m_keyGlobal.HasSubKey(strName);
}

bool wxRegConfig::HasEntry(const wxString& key) const
{
    wxConfigPathChanger path(this, key);

    wxString strName(path.Name());

    return (m_keyLocal.Exists() && LocalKey().HasValue(strName)) ||
           m_keyGlobal.HasValue(strName);
}

wxConfigBase::EntryType wxRegConfig::GetEntryType(const wxString& key) const
{
    wxConfigPathChanger path(this, key);

    wxString strName(path.Name());

    bool isNumeric;
    if ( m_keyLocal.Exists() && LocalKey().HasValue(strName) )
        isNumeric = m_keyLocal.IsNumericValue(strName);
    else if ( m_keyGlobal.HasValue(strName) )
        isNumeric = m_keyGlobal.IsNumericValue(strName);
    else
        return wxConfigBase::Type_Unknown;

    return isNumeric ? wxConfigBase::Type_Integer : wxConfigBase::Type_String;
}

// ----------------------------------------------------------------------------
// reading/writing
// ----------------------------------------------------------------------------

bool wxRegConfig::DoReadString(const wxString& key, wxString *pStr) const
{
    wxCHECK_MSG( pStr, false, _T("wxRegConfig::Read(): NULL param") );

  wxConfigPathChanger path(this, key);

  bool bQueryGlobal = true;

  // if immutable key exists in global key we must check that it's not
  // overriden by the local key with the same name
  if ( IsImmutable(path.Name()) ) {
    if ( TryGetValue(m_keyGlobal, path.Name(), *pStr) ) {
      if ( m_keyLocal.Exists() && LocalKey().HasValue(path.Name()) ) {
        wxLogWarning(wxT("User value for immutable key '%s' ignored."),
                   path.Name().c_str());
      }

      return true;
    }
    else {
      // don't waste time - it's not there anyhow
      bQueryGlobal = false;
    }
  }

  // first try local key
  if ( (m_keyLocal.Exists() && TryGetValue(LocalKey(), path.Name(), *pStr)) ||
       (bQueryGlobal && TryGetValue(m_keyGlobal, path.Name(), *pStr)) ) {
    return true;
  }

  return false;
}

// this exactly reproduces the string version above except for ExpandEnvVars(),
// we really should avoid this code duplication somehow...

bool wxRegConfig::DoReadLong(const wxString& key, long *plResult) const
{
    wxCHECK_MSG( plResult, false, _T("wxRegConfig::Read(): NULL param") );

  wxConfigPathChanger path(this, key);

  bool bQueryGlobal = true;

  // if immutable key exists in global key we must check that it's not
  // overriden by the local key with the same name
  if ( IsImmutable(path.Name()) ) {
    if ( TryGetValue(m_keyGlobal, path.Name(), plResult) ) {
      if ( m_keyLocal.Exists() && LocalKey().HasValue(path.Name()) ) {
        wxLogWarning(wxT("User value for immutable key '%s' ignored."),
                     path.Name().c_str());
      }

      return true;
    }
    else {
      // don't waste time - it's not there anyhow
      bQueryGlobal = false;
    }
  }

  // first try local key
  if ( (m_keyLocal.Exists() && TryGetValue(LocalKey(), path.Name(), plResult)) ||
       (bQueryGlobal && TryGetValue(m_keyGlobal, path.Name(), plResult)) ) {
    return true;
  }

  return false;
}

bool wxRegConfig::DoWriteString(const wxString& key, const wxString& szValue)
{
  wxConfigPathChanger path(this, key);

  if ( IsImmutable(path.Name()) ) {
    wxLogError(wxT("Can't change immutable entry '%s'."), path.Name().c_str());
    return false;
  }

  return LocalKey().SetValue(path.Name(), szValue);
}

bool wxRegConfig::DoWriteLong(const wxString& key, long lValue)
{
  wxConfigPathChanger path(this, key);

  if ( IsImmutable(path.Name()) ) {
    wxLogError(wxT("Can't change immutable entry '%s'."), path.Name().c_str());
    return false;
  }

  return LocalKey().SetValue(path.Name(), lValue);
}

// ----------------------------------------------------------------------------
// renaming
// ----------------------------------------------------------------------------

bool wxRegConfig::RenameEntry(const wxString& oldName, const wxString& newName)
{
    // check that the old entry exists...
    if ( !HasEntry(oldName) )
        return false;

    // and that the new one doesn't
    if ( HasEntry(newName) )
        return false;

    return m_keyLocal.RenameValue(oldName, newName);
}

bool wxRegConfig::RenameGroup(const wxString& oldName, const wxString& newName)
{
    // check that the old group exists...
    if ( !HasGroup(oldName) )
        return false;

    // and that the new one doesn't
    if ( HasGroup(newName) )
        return false;

    return wxRegKey(m_keyLocal, oldName).Rename(newName);
}

// ----------------------------------------------------------------------------
// deleting
// ----------------------------------------------------------------------------

bool wxRegConfig::DeleteEntry(const wxString& value, bool bGroupIfEmptyAlso)
{
  wxConfigPathChanger path(this, value);

  if ( m_keyLocal.Exists() ) {
    if ( !m_keyLocal.DeleteValue(path.Name()) )
      return false;

    if ( bGroupIfEmptyAlso && m_keyLocal.IsEmpty() ) {
      wxString strKey = GetPath().AfterLast(wxCONFIG_PATH_SEPARATOR);
      SetPath(_T(".."));  // changes m_keyLocal
      return LocalKey().DeleteKey(strKey);
    }
  }

  return true;
}

bool wxRegConfig::DeleteGroup(const wxString& key)
{
  wxConfigPathChanger path(this, key);

  return m_keyLocal.Exists() ? LocalKey().DeleteKey(path.Name()) : true;
}

bool wxRegConfig::DeleteAll()
{
  m_keyLocal.Close();
  m_keyGlobal.Close();

  bool bOk = m_keyLocalRoot.DeleteSelf();

  // make sure that we opened m_keyGlobalRoot and so it has a reasonable name:
  // otherwise we will delete HKEY_CLASSES_ROOT recursively
  if ( bOk && m_keyGlobalRoot.IsOpened() )
    bOk = m_keyGlobalRoot.DeleteSelf();

  return bOk;
}

#endif
  // wxUSE_CONFIG