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class TEnv: public TObject


TEnv

The TEnv class reads config files, by default named .rootrc. Three
types of config files are read: global, user and local files. The
 global file is $ROOTSYS/etc/system<name> (or ROOTETCDIR/system<name>)
the user file is $HOME/<name> and the local file is ./<name>.
By setting the shell variable ROOTENV_NO_HOME=1 the reading of
the $HOME/<name> resource file will be skipped. This might be useful
in case the home directory resides on an automounted remote file
system and one wants to avoid this file system from being mounted.

The format of the .rootrc file is similar to the .Xdefaults format:

[+]<SystemName>.<RootName|ProgName>.<name>[(type)]:  <value>

Where <SystemName> is either Unix, WinNT, MacOS or Vms,
<RootName> the name as given in the TApplication ctor (or "RootApp"
in case no explicit TApplication derived object was created),
<ProgName> the current program name and <name> the resource name,
with optionally a type specification. <value> can be either a
string, an integer, a float/double or a boolean with the values
TRUE, FALSE, ON, OFF, YES, NO, OK, NOT. Booleans will be returned as
an integer 0 or 1. The options [+] allows the concatenation of
values to the same resouce name.

E.g.:

Unix.Rint.Root.DynamicPath: .:$(ROOTSYS)/lib:~/lib
myapp.Root.Debug:  FALSE
TH.Root.Debug: YES
*.Root.MemStat: 1

<SystemName> and <ProgName> or <RootName> may be the wildcard "*".
A # in the first column starts comment line.

Note that the environment variables (like $ROOTSYS) need to be
surrounded in parentheses in order to be expanded.

For the currently defined resources (and their default values) see
$ROOTSYS/etc/system.rootrc.

Note that the .rootrc config files contain the config for all ROOT
based applications.

To add new entries to a TEnv:
TEnv env(".myfile");
env.SetValue("myname","value");
env.SaveLevel(kEnvLocal);

All new entries will be saved in the file corresponding to the
first SaveLevel() command.  If Save() is used, new entries go
into the local file by default.

Function Members (Methods)

public:

	TEnv(const char* name = "")
virtual	~TEnv()
void	TObject::AbstractMethod(const char* method) const
virtual void	TObject::AppendPad(Option_t* option = "")
virtual void	TObject::Browse(TBrowser* b)
static TClass*	Class()
virtual const char*	TObject::ClassName() const
virtual void	TObject::Clear(Option_t* = "")
virtual TObject*	TObject::Clone(const char* newname = "") const
virtual Int_t	TObject::Compare(const TObject* obj) const
virtual void	TObject::Copy(TObject& object) const
Bool_t	Defined(const char* name)
virtual void	TObject::Delete(Option_t* option = "")MENU
virtual Int_t	TObject::DistancetoPrimitive(Int_t px, Int_t py)
virtual void	TObject::Draw(Option_t* option = "")
virtual void	TObject::DrawClass() constMENU
virtual TObject*	TObject::DrawClone(Option_t* option = "") constMENU
virtual void	TObject::Dump() constMENU
virtual void	TObject::Error(const char* method, const char* msgfmt) const
virtual void	TObject::Execute(const char* method, const char* params, Int_t* error = 0)
virtual void	TObject::Execute(TMethod* method, TObjArray* params, Int_t* error = 0)
virtual void	TObject::ExecuteEvent(Int_t event, Int_t px, Int_t py)
virtual void	TObject::Fatal(const char* method, const char* msgfmt) const
virtual TObject*	TObject::FindObject(const char* name) const
virtual TObject*	TObject::FindObject(const TObject* obj) const
virtual Option_t*	TObject::GetDrawOption() const
static Long_t	TObject::GetDtorOnly()
virtual const char*	TObject::GetIconName() const
virtual const char*	TObject::GetName() const
virtual char*	TObject::GetObjectInfo(Int_t px, Int_t py) const
static Bool_t	TObject::GetObjectStat()
virtual Option_t*	TObject::GetOption() const
virtual const char*	GetRcName() const
THashList*	GetTable() const
virtual const char*	TObject::GetTitle() const
virtual UInt_t	TObject::GetUniqueID() const
virtual Int_t	GetValue(const char* name, Int_t dflt)
virtual Double_t	GetValue(const char* name, Double_t dflt)
virtual const char*	GetValue(const char* name, const char* dflt)
virtual Bool_t	TObject::HandleTimer(TTimer* timer)
virtual ULong_t	TObject::Hash() const
Bool_t	IgnoreDuplicates(Bool_t ignore)
virtual void	TObject::Info(const char* method, const char* msgfmt) const
virtual Bool_t	TObject::InheritsFrom(const char* classname) const
virtual Bool_t	TObject::InheritsFrom(const TClass* cl) const
virtual void	TObject::Inspect() constMENU
void	TObject::InvertBit(UInt_t f)
virtual TClass*	IsA() const
virtual Bool_t	TObject::IsEqual(const TObject* obj) const
virtual Bool_t	TObject::IsFolder() const
Bool_t	TObject::IsOnHeap() const
virtual Bool_t	TObject::IsSortable() const
Bool_t	TObject::IsZombie() const
virtual TEnvRec*	Lookup(const char* n)
virtual void	TObject::ls(Option_t* option = "") const
void	TObject::MayNotUse(const char* method) const
virtual Bool_t	TObject::Notify()
void	TObject::Obsolete(const char* method, const char* asOfVers, const char* removedFromVers) const
static void	TObject::operator delete(void* ptr)
static void	TObject::operator delete(void* ptr, void* vp)
static void	TObject::operator delete[](void* ptr)
static void	TObject::operator delete[](void* ptr, void* vp)
void*	TObject::operator new(size_t sz)
void*	TObject::operator new(size_t sz, void* vp)
void*	TObject::operator new[](size_t sz)
void*	TObject::operator new[](size_t sz, void* vp)
virtual void	TObject::Paint(Option_t* option = "")
virtual void	TObject::Pop()
virtual void	Print(Option_t* option = "") const
virtual void	PrintEnv(EEnvLevel level = kEnvAll) const
virtual Int_t	TObject::Read(const char* name)
virtual Int_t	ReadFile(const char* fname, EEnvLevel level)
virtual void	TObject::RecursiveRemove(TObject* obj)
void	TObject::ResetBit(UInt_t f)
virtual void	Save()
virtual void	TObject::SaveAs(const char* filename = "", Option_t* option = "") constMENU
virtual void	SaveLevel(EEnvLevel level)
virtual void	TObject::SavePrimitive(ostream& out, Option_t* option = "")
void	TObject::SetBit(UInt_t f)
void	TObject::SetBit(UInt_t f, Bool_t set)
virtual void	TObject::SetDrawOption(Option_t* option = "")MENU
static void	TObject::SetDtorOnly(void* obj)
static void	TObject::SetObjectStat(Bool_t stat)
virtual void	SetRcName(const char* name)
virtual void	TObject::SetUniqueID(UInt_t uid)
virtual void	SetValue(const char* name, EEnvLevel level = kEnvChange)
virtual void	SetValue(const char* name, Int_t value)
virtual void	SetValue(const char* name, Double_t value)
virtual void	SetValue(const char* name, const char* value, EEnvLevel level = kEnvChange, const char* type = 0)
virtual void	ShowMembers(TMemberInspector&)
virtual void	Streamer(TBuffer&)
void	StreamerNVirtual(TBuffer& ClassDef_StreamerNVirtual_b)
virtual void	TObject::SysError(const char* method, const char* msgfmt) const
Bool_t	TObject::TestBit(UInt_t f) const
Int_t	TObject::TestBits(UInt_t f) const
virtual void	TObject::UseCurrentStyle()
virtual void	TObject::Warning(const char* method, const char* msgfmt) const
virtual Int_t	TObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0)
virtual Int_t	TObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0) const
virtual Int_t	WriteFile(const char* fname, EEnvLevel level = kEnvAll)

protected:

virtual void	TObject::DoError(int level, const char* location, const char* fmt, va_list va) const
void	TObject::MakeZombie()

private:

	TEnv(const TEnv&)
const char*	Getvalue(const char* name)
TEnv&	operator=(const TEnv&)

Data Members

public:

enum TObject::EStatusBits {	kCanDelete
	kMustCleanup
	kObjInCanvas
	kIsReferenced
	kHasUUID
	kCannotPick
	kNoContextMenu
	kInvalidObject
};
enum TObject::[unnamed] {	kIsOnHeap
	kNotDeleted
	kZombie
	kBitMask
	kSingleKey
	kOverwrite
	kWriteDelete
};

private:

Bool_t	fIgnoreDup	ignore duplicates, don't issue warning
TString	fRcName	resource file base name
THashList*	fTable	hash table containing env records

Class Charts

Inheritance Inherited Members Includes Libraries

Function documentation

TEnv(const char* name = "")

 Create a resource table and read the (possibly) three resource files, i.e
 $ROOTSYS/etc/system<name> (or ROOTETCDIR/system<name>), $HOME/<name> and
 ./<name>. ROOT always reads ".rootrc" (in TROOT::InitSystem()). You can
 read additional user defined resource files by creating addtional TEnv
 objects. By setting the shell variable ROOTENV_NO_HOME=1 the reading of
 the $HOME/<name> resource file will be skipped. This might be useful in
 case the home directory resides on an automounted remote file system
 and one wants to avoid the file system from being mounted.

~TEnv()

 Delete the resource table.

const char * Getvalue(const char* name)

 Returns the character value for a named resouce.

Int_t GetValue(const char* name, Int_t dflt)

 Returns the integer value for a resource. If the resource is not found
 return the dflt value.

Double_t GetValue(const char* name, Double_t dflt)

 Returns the double value for a resource. If the resource is not found
 return the dflt value.

const char * GetValue(const char* name, const char* dflt)

 Returns the character value for a named resouce. If the resource is
 not found the dflt value is returned.

TEnvRec * Lookup(const char* n)

 Loop over all resource records and return the one with name.
 Return 0 in case name is not in the resoucre table.

void Print(Option_t* option = "") const

 Print all resources or the global, user or local resources separately.

void PrintEnv(EEnvLevel level = kEnvAll) const

 Print all resources for a certain level (global, user, local, changed).

Int_t ReadFile(const char* fname, EEnvLevel level)

 Read and parse the resource file for a certain level.
 Returns -1 on case of error, 0 in case of success.

Int_t WriteFile(const char* fname, EEnvLevel level = kEnvAll)

 Write resourse records to file fname for a certain level. Use
 level kEnvAll to write all resources. Returns -1 on case of error,
 0 in case of success.

void Save()

 Write the resource files for each level. The new files have the same
 name as the original files. The old files are renamed to *.bak.

void SaveLevel(EEnvLevel level)

 Write the resource file for a certain level.

void SetValue(const char* name, const char* value, EEnvLevel level = kEnvChange, const char* type = 0)

 Set the value of a resource or create a new resource.

void SetValue(const char* name, EEnvLevel level = kEnvChange)

 Set the value of a resource or create a new resource.
 Use this method to set a resource like, "name=val".
 If just "name" is given it will be interpreted as "name=1".

void SetValue(const char* name, Int_t value)

 Set or create an integer resource value.

void SetValue(const char* name, Double_t value)

 Set or create a double resource value.

Bool_t IgnoreDuplicates(Bool_t ignore)

 If set to true, no warnings in case of duplicates are issued.
 Returns previous value.

TEnv(const TEnv& )

TEnv& operator=(const TEnv& )

THashList * GetTable() const

{ return fTable; }

Bool_t Defined(const char* name)

{ return Getvalue(name) != 0; }

const char * GetRcName() const

{ return fRcName; }

void SetRcName(const char* name)

{ fRcName = name; }