/////////////////////////////////////////////////////////////////////////////// // Name: config.h // Purpose: declaration of the base class of all config implementations // (see also: fileconf.h and msw/regconf.h) // Author: Karsten Ballüder & Vadim Zeitlin // Modified by: // Created: 07.04.98 (adapted from appconf.h) // RCS-ID: $Id$ // Copyright: (c) 1997 Karsten Ballüder Ballueder@usa.net // Vadim Zeitlin // Licence: wxWindows license /////////////////////////////////////////////////////////////////////////////// #ifndef _APPCONF_H #define _APPCONF_H #ifdef __GNUG__ #pragma interface "config.h" #endif // ---------------------------------------------------------------------------- // compile options // ---------------------------------------------------------------------------- // it won't compile without it anyhow #ifndef USE_WXCONFIG #error "Please define USE_WXCONFIG or remove config.cpp from your makefile" #endif // USE_WXCONFIG // ---------------------------------------------------------------------------- // constants // ---------------------------------------------------------------------------- /// shall we be case sensitive in parsing variable names? #ifndef APPCONF_CASE_SENSITIVE #define APPCONF_CASE_SENSITIVE FALSE #endif /// separates group and entry names #ifndef APPCONF_PATH_SEPARATOR #define APPCONF_PATH_SEPARATOR '/' #endif /// introduces immutable entries #ifndef APPCONF_IMMUTABLE_PREFIX #define APPCONF_IMMUTABLE_PREFIX '!' #endif /// should we use registry instead of configuration files under Win32? #ifndef APPCONF_WIN32_NATIVE #define APPCONF_WIN32_NATIVE TRUE #endif // ---------------------------------------------------------------------------- // various helper global functions // ---------------------------------------------------------------------------- /* Replace environment variables ($SOMETHING) with their values. The format is $VARNAME or ${VARNAME} where VARNAME contains alphanumeric characters and '_' only. '$' must be escaped ('\$') in order to be taken literally. */ extern wxString ExpandEnvVars(const wxString& str); /* Split path into parts removing '..' in progress */ extern void SplitPath(wxArrayString& aParts, const char *sz); // ---------------------------------------------------------------------------- // abstract base class wxConfig which defines the interface for derived classes // // wxConfig organizes the items in a tree-like structure (modeled after the // Unix/Dos filesystem). There are groups (directories) and keys (files). // There is always one current group given by the current path. // // Keys are pairs "key_name = value" where value may be of string or integer // (long) type (@@@ doubles and other types such as wxDate coming soon). // ---------------------------------------------------------------------------- class wxConfig { public: // static functions // sets the config object, returns the previous pointer static wxConfig *Set(wxConfig *pConfig); // get the config object, creates it on demand static wxConfig *Get() { if ( !ms_pConfig ) Create(); return ms_pConfig; } // create a new config object static void Create(); // ctor & virtual dtor wxConfig() { } virtual ~wxConfig(); // path management // set current path: if the first character is '/', it's the absolute path, // otherwise it's a relative path. '..' is supported. If the strPath // doesn't exist it is created. virtual void SetPath(const wxString& strPath) = 0; // retrieve the current path (always as absolute path) virtual const wxString& GetPath() const = 0; // enumeration: all functions here return false when there are no more items. // you must pass the same lIndex to GetNext and GetFirst (don't modify it) // enumerate subgroups virtual bool GetFirstGroup(wxString& str, long& lIndex) = 0; virtual bool GetNextGroup (wxString& str, long& lIndex) = 0; // enumerate entries virtual bool GetFirstEntry(wxString& str, long& lIndex) = 0; virtual bool GetNextEntry (wxString& str, long& lIndex) = 0; // tests of existence // returns TRUE if the group by this name exists virtual bool HasGroup(const wxString& strName) const = 0; // same as above, but for an entry virtual bool HasEntry(const wxString& strName) const = 0; // returns TRUE if either a group or an entry with a given name exist bool Exists(const wxString& strName) const { return HasGroup(strName) || HasEntry(strName); } // key access: returns TRUE if value was really read, FALSE if default used // (and if the key is not found the default value is returned.) // read a string from the key virtual bool Read(wxString *pStr, const char *szKey, const char *szDefault = NULL) const = 0; // another version using statis buffer - it means it will be overwritten // after each call to this function! virtual const char *Read(const char *szKey, const char *szDefault = NULL) const; // the same for longs virtual long Read(const char *szKey, long lDefault) const { long l; Read(&l, szKey, lDefault); return l; } // and another version: returns true if default value is returned virtual bool Read(long *pl, const char *szKey, long lDefault = 0) const = 0; // write the value (return true on success) virtual bool Write(const char *szKey, const char *szValue) = 0; virtual bool Write(const char *szKey, long lValue) = 0; // permanently writes all changes virtual bool Flush(bool bCurrentOnly = FALSE) = 0; // delete entries/groups // deletes the specified entry and the group it belongs to if // it was the last key in it and the second parameter is true virtual bool DeleteEntry(const char *szKey, bool bDeleteGroupIfEmpty = TRUE) = 0; // delete the group (with all subgroups) virtual bool DeleteGroup(const char *szKey) = 0; // delete the whole underlying object (disk file, registry key, ...) // primarly for use by desinstallation routine. virtual bool DeleteAll() = 0; protected: static bool IsImmutable(const char *szKey) { return *szKey == APPCONF_IMMUTABLE_PREFIX; } // a handy little class which changes current path to the path of given entry // and restores it in dtor: so if you declare a local variable of this type, // you work in the entry directory and the path is automatically restored // when function returns class PathChanger { public: // ctor/dtor do path changing/restorin PathChanger(const wxConfig *pContainer, const wxString& strEntry); ~PathChanger(); // get the key name const wxString& Name() const { return m_strName; } private: wxConfig *m_pContainer; // object we live in wxString m_strName, // name of entry (i.e. name only) m_strOldPath; // saved path bool m_bChanged; // was the path changed? }; // are we doing automatic environment variable expansion? bool m_bExpandEnvVars; // static variables static wxConfig *ms_pConfig; }; #endif //_APPCONF_H