include/qore/SystemEnvironment.h (4311)

/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
  SystemEnvironment.h

  Qore Programming Language

  Copyright 2003 - 2011 David Nichols

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef _QORE_SYSTEMENVIRONMENT_H

#define _QORE_SYSTEMENVIRONMENT_H


class SystemEnvironment {
      friend class AtomicEnvironmentSetter;

   private:
      DLLLOCAL SystemEnvironment(const SystemEnvironment&);

      DLLLOCAL SystemEnvironment& operator=(const SystemEnvironment&);

   protected:

      DLLLOCAL static int set_intern(const char *name, const char *value, bool overwrite = 1);


      DLLLOCAL static class QoreString *get_intern(const char *name);


      DLLLOCAL static class QoreStringNode *get_as_string_node_intern(const char *name);


      DLLLOCAL static int get_intern(const char *name, class QoreString &str);
      

      DLLLOCAL static int unset_intern(const char *name);
      
   public:
      DLLLOCAL SystemEnvironment();
      DLLLOCAL ~SystemEnvironment();


      DLLEXPORT static int set(const char *name, const char *value, bool overwrite = 1);


      DLLEXPORT static class QoreString *get(const char *name);


      DLLEXPORT static class QoreStringNode *getAsStringNode(const char *name);


      DLLEXPORT static int get(const char *name, class QoreString &str);
      

      DLLEXPORT static int unset(const char *name);
      

      DLLEXPORT static bool valueExists(const char* name); // true if exists and is not empty
};

DLLEXPORT extern SystemEnvironment SysEnv;


class AtomicEnvironmentSetter
{
   private:
      DLLLOCAL AtomicEnvironmentSetter(const AtomicEnvironmentSetter&);

      DLLLOCAL AtomicEnvironmentSetter& operator=(const AtomicEnvironmentSetter&);

      DLLLOCAL void* operator new(size_t); // not implemented, make sure it is not new'ed

   public:
      DLLEXPORT AtomicEnvironmentSetter();
      DLLEXPORT ~AtomicEnvironmentSetter();


      DLLEXPORT int set(const char *name, const char *value, bool overwrite = 1);


      DLLEXPORT class QoreString *get(const char *name);


      DLLEXPORT class QoreStringNode *getAsStringNode(const char *name);


      DLLEXPORT int get(const char *name, class QoreString &str);
      

      DLLEXPORT int unset(const char *name);
      

      DLLEXPORT bool valueExists(const char* name); // true if exists and is not empty
};

#endif