// @(#)root/meta:$Name: $:$Id: TDataMember.cxx,v 1.23 2004/11/22 15:53:41 brun Exp $
// Author: Fons Rademakers 04/02/95
/*************************************************************************
* Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
//////////////////////////////////////////////////////////////////////////
//
// TDataMember.
//
// All ROOT classes may have RTTI (run time type identification) support
// added. The data is stored in so called DICTIONARY (look at TDictionary).
// Information about a class is stored in TClass.
// This information may be obtained via the CINT api - see class TCint.
// TClass has a list of TDataMember objects providing information about all
// data members of described class.
//
/*
*/
//
// TDataMember provides information about name of data member, its type,
// and comment field string. It also tries to find the TMethodCall objects
// responsible for getting/setting a value of it, and gives you pointers
// to these methods. This gives you a unique possibility to access
// protected and private (!) data members if only methods for doing that
// are defined.
// These methods could either be specified in a comment field, or found
// out automatically by ROOT: here's an example:
// suppose you have a class definition:
//
/*
class MyClass{
private:
Float_t fX1;
...
public:
void SetX1(Float_t x) {fX1 = x;};
Float_t GetX1() {return fX1;};
...
}
*/
//
//
// Look at the data member name and method names: a data member name has
// a prefix letter (f) and has a base name X1 . The methods for getting and
// setting this value have names which consist of string Get/Set and the
// same base name. This convention of naming data fields and methods which
// access them allows TDataMember find this methods by itself completely
// automatically. To make this description complete, one should know,
// that names that are automatically recognized may be also:
// for data fields: either fXXX or fIsXXX; and for getter function
// GetXXX() or IsXXX() [where XXX is base name].
//
// As an example of using it let's analyse a few lines which get and set
// a fEditable field in TCanvas:
//
/*
TCanvas *c = new TCanvas("c"); // create a canvas
TClass *cl = c->IsA(); // get its class description object.
TDataMember *dm = cl->GetDataMember("fEditable"); //This is our data member
TMethodCall *getter = dm->GetterMethod(c); //find a method that gets value!
Long_t l; // declare a storage for this value;
getter->Execute(c,"",l); // Get this Value !!!! It will appear in l !!!
TMethodCall *setter = dm->SetterMethod(c);
setter->Execute(c,"0",); // Set Value 0 !!!
*/
//
//
//
// This trick is widely used in ROOT TContextMenu and dialogs for obtaining
// current values and put them as initial values in dialog fields.
//
// If you don't want to follow the convention of naming used by ROOT
// you still could benefit from Getter/Setter method support: the solution
// is to instruct ROOT what the names of these routines are.
// The way to do it is putting this information in a comment string to a data
// field in your class declaration:
//
//
/*
class MyClass{
Int_t mydata; // *OPTIONS={GetMethod="Get";SetMethod="Set"}
...
Int_t Get() const { return mydata;};
void Set(Int_t i) {mydata=i;};
}
*/
//
//
//
// However, this getting/setting functions are not the only feature of
// this class. The next point is providing lists of possible settings
// for the concerned data member. The idea is to have a list of possible
// options for this data member, with strings identifying them. This
// is used in dialogs with parameters to set - for details see
// TMethodArg, TRootContextMenu, TContextMenu. This list not only specifies
// the allowed value, but also provides strings naming the options.
// Options are managed via TList of TOptionListItem objects. This list
// is also created automatically: if a data type is an enum type,
// the list will have items describing every enum value, and named
// according to enum name. If type is Bool_t, two options "On" and "Off"
// with values 0 and 1 are created. For other types you need to instruct
// ROOT about possible options. The way to do it is the same as in case of
// specifying getter/setter method: a comment string to a data field in
// Your header file with class definition.
// The most general format of this string is:
//
/*
*OPTIONS={GetMethod="getter";SetMethod="setter";Items=(it1="title1",it2="title2", ... ) }
*/
//
//
//
// While parsing this string ROOT firstly looks for command-tokens:
// GetMethod, SetMethod, Items; They must be preceded by string
// *OPTIONS= , enclosed by {} and separated by semicolons ";".
// All command token should have a form TOKEN=VALUE.
// All tokens are optional.
// The names of getter and setter method must be enclosed by double-quote
// marks (") .
// Specifications of Items is slightly more complicated: you need to
// put token ITEMS= and then enclose all options in curly brackets "()".
// You separate options by comas ",".
// Each option item may have one of the following forms:
//
/*
IntegerValue = "Text Label"
EnumValue = "Text Label"
"TextValue" = Text Label"
*/
//
//
//
// One can sepcify values as Integers or Enums - when data field is an
// Integer, Float or Enum type; as texts - for Text_t (more precisely:
// Option_t).
//
// As mentioned above - this information are mainly used by contextmenu,
// but also in Dump() and Inspect() methods and by the THtml class.
//
//////////////////////////////////////////////////////////////////////////
#include "TDataMember.h"
#include "TDataType.h"
#include "TROOT.h"
#include "TGlobal.h"
#include "TInterpreter.h"
#include "Strlen.h"
#include "Api.h"
#include "TMethodCall.h"
#include "TClass.h"
#include "TClassEdit.h"
#include "TMethod.h"
#include "TIterator.h"
#include "TList.h"
#include "TGlobal.h"
#include "TRealData.h"
ClassImp(TDataMember)
//______________________________________________________________________________
TDataMember::TDataMember(G__DataMemberInfo *info, TClass *cl) : TDictionary()
{
// Default TDataMember ctor. TDataMembers are constructed in TClass
// via a call to TCint::CreateListOfDataMembers(). It parses the comment
// string, initializes optionlist and getter/setter methods.
fInfo = info;
fClass = cl;
fDataType = 0;
fOptions = 0;
fValueSetter = 0;
fValueGetter = 0;
fOffset = -1;
fProperty = -1;
fSTLCont = -1;
if (!fInfo && !fClass) return; // default ctor is called
if (fInfo) {
fFullTypeName = fInfo->Type()->Name();
fTrueTypeName = fInfo->Type()->TrueName();
fTypeName = gInterpreter->TypeName(fFullTypeName);
SetName(fInfo->Name());
const char *t = fInfo->Title();
SetTitle(t);
if (t && t[0] != '!') SetBit(kObjIsPersistent);
fDataType = 0;
if (IsBasic() || IsEnum()) {
if (IsBasic()) {
const char *name = GetFullTypeName();
if (strcmp(name, "unsigned char") != 0 &&
strncmp(name, "unsigned short", sizeof ("unsigned short")) != 0 &&
strcmp(name, "unsigned int") != 0 &&
strncmp(name, "unsigned long", sizeof ("unsigned long")) != 0)
// strncmp() also covers "unsigned long long"
name = GetTypeName();
fDataType = gROOT->GetType(name);
if (fDataType==0) {
// humm we did not find it ... maybe it's a typedef that has not been loaded yet.
// (this can happen if the executable does not have a TApplication object).
fDataType = gROOT->GetType(name,kTRUE);
}
} else {
fDataType = gROOT->GetType("Int_t");
}
// if (!fDataType)
// Error("TDataMember", "basic data type %s not found in list of basic types",
// GetTypeName());
}
}
// If option string exist in comment - we'll parse it and create
// list of options
// Option-list string has a form:
// *OPTION={GetMethod="GetXXX";SetMethod="SetXXX";
// Items=(0="NULL ITEM","one"="First Item",kRed="Red Item")}
//
// As one can see it is possible to specify value as either numerical
// value , string or enum.
// One can also specify implicitly names of Getter/Setter methods.
char cmt[2048];
char opt[2048];
char *opt_ptr = 0;
char *ptr1 = 0;
char *ptr2 = 0;
char *ptr3 = 0;
char *tok = 0;
Int_t cnt = 0;
Int_t token_cnt;
Int_t i;
strcpy(cmt,fInfo->Title());
if ((opt_ptr=strstr(cmt,"*OPTION={"))) {
// If we found it - parsing...
//let's cut the part lying between {}
ptr1 = strtok(opt_ptr ,"{}"); //starts tokenizing:extracts "*OPTION={"
ptr1 = strtok((char*)0,"{}"); //And now we have what we need in ptr1!!!
//and save it:
strcpy(opt,ptr1);
// Let's extract sub-tokens extracted by ';' sign.
// We'll put'em in an array for convenience;
// You have to do it in this manner because you cannot use nested 'strtok'
char *tokens[256]; // a storage for these sub-tokens.
token_cnt = 0;
cnt = 0;
do { //tokenizing loop
ptr1=strtok((char*) (cnt++ ? 0:opt),";");
if (ptr1){
tok=new char[strlen(ptr1)+1];
strcpy(tok,ptr1);
tokens[token_cnt]=tok;
token_cnt++;
}
} while (ptr1);
// OK! Now let's check whether we have Get/Set methods encode in any string
for (i=0;i<token_cnt;i++) {
if (strstr(tokens[i],"GetMethod")) {
ptr1 = strtok(tokens[i],"\""); //tokenizing-strip text "GetMethod"
ptr1 = strtok(0,"\""); //tokenizing - name is in ptr1!
if (GetClass()->GetMethod(ptr1,"")) // check whether such method exists
// FIXME: wrong in case called derives via multiple inheritance from this class
fValueGetter = new TMethodCall(GetClass(),ptr1,"");
continue; //next item!
}
if (strstr(tokens[i],"SetMethod")) {
ptr1 = strtok(tokens[i],"\"");
ptr1 = strtok((char*)0,"\""); //name of Setter in ptr1
if (GetClass()->GetMethod(ptr1,"1"))
// FIXME: wrong in case called derives via multiple inheritance from this class
fValueSetter = new TMethodCall(GetClass(),ptr1,"1");
}
}
//Now let's parse option strings...
Int_t opt_cnt = 0;
TList *optionlist = new TList(); //storage for options strings
for (i=0;i<token_cnt;i++) {
if (strstr(tokens[i],"Items")) {
ptr1 = strtok(tokens[i],"()");
ptr1 = strtok((char*)0,"()");
char opt[2048]; //and save it!
strcpy(opt,ptr1);
//now parse it...
//fistly we just store strings like: xxx="Label Name"
//We'll store it in TOptionListItem objects, because they're derived
//from TObject and thus can be stored in TList.
//It's not elegant but works.
do {
ptr1 = strtok(opt_cnt++ ? (char*)0:opt,","); //options extraction
if (ptr1) {
TOptionListItem *it = new TOptionListItem(this,1,0,0,ptr1,"");
optionlist->Add(it);
}
} while(ptr1);
}
}
//having all options extracted and put into list, we finally can parse
//them to create a list of options...
fOptions = new TList(); //create the list
TIter next(optionlist); //we'll iterate through all
//strings containing options
TOptionListItem *it = 0;
TOptionListItem *it1 = 0;
while ((it=(TOptionListItem*)next())) {
ptr1 = it->fOptName;
Bool_t islabel = (ptr1[0]=='\"'); // value is label or numerical?
ptr2 = strtok(ptr1,"=\""); //extract LeftHandeSide
ptr3 = strtok(0,"=\""); //extract RightHandedSize
if (islabel) {
it1=new TOptionListItem(this,-9999,0,0,ptr3,ptr2);
fOptions->Add(it1);
} else {
//We'll try to find global enum existing in ROOT...
Long_t l;
Int_t *value;
TGlobal *enumval = gROOT->GetGlobal(ptr1,kTRUE);
if (enumval){
value = (Int_t*)(enumval->GetAddress());
l = (Long_t)(*value);
} else l = atol(ptr1);
it1 = new TOptionListItem(this,l,0,0,ptr3,ptr1);
fOptions->Add(it1);
}
optionlist->Remove(it); //delete this option string from list
delete it; // and dispose of it.
}
// Garbage colletion
// dispose of temporary option list...
delete optionlist;
//And dispose tokens string...
for (i=0;i<token_cnt;i++) if(tokens[i]) delete tokens[i];
// if option string does not exist but it's an Enum - parse it!!!!
//} else if (!strncmp(GetFullTypeName(),"enum",4)) {
} else if (IsEnum()) {
TGlobal *global = 0;
TDataMember::fOptions = new TList();
char etypename[65];
strncpy(etypename,this->GetTypeName(),64); //save the typename!!! must do it!
const char *gtypename = 0;
TList *globals = (TList*)(gROOT->GetListOfGlobals(kTRUE)); //get all globals
if (!globals) return;
TIter nextglobal(globals); //iterate through all global to find
while ((global=(TGlobal*)nextglobal())) { // values belonging to this enum type
gtypename = global->GetTypeName();
if (strcmp(gtypename,etypename)==0) {
Int_t *value = (Int_t*)(global->GetAddress());
Long_t l = (Long_t)(*value);
char enumItem[128];
strcpy(enumItem,global->GetName());
TOptionListItem *it = new TOptionListItem(this,l,0,0,enumItem,enumItem);
fOptions->Add(it);
}
}
// and the case od Bool_t : we add items "ON" and "Off"
} else if (!strncmp(GetFullTypeName(),"Bool_t",6)){
fOptions = new TList();
TOptionListItem *it = new TOptionListItem(this,1,0,0,"ON",0);
fOptions->Add(it);
it = new TOptionListItem(this,0,0,0,"Off",0);
fOptions->Add(it);
} else fOptions = 0;
}
//______________________________________________________________________________
TDataMember::~TDataMember()
{
// TDataMember dtor deletes adopted G__DataMemberInfo object.
delete fInfo;
delete fValueSetter;
delete fValueGetter;
if (fOptions) {
fOptions->Delete();
delete fOptions;
}
}
//______________________________________________________________________________
Int_t TDataMember::GetArrayDim() const
{
// Return number of array dimensions.
return fInfo->ArrayDim();
}
//______________________________________________________________________________
const char *TDataMember::GetArrayIndex() const
{
// If the data member is pointer and has a valid array size in its comments
// GetArrayIndex returns a string pointing to it;
// otherwise it returns an empty string.
const char* val = fInfo->ValidArrayIndex();
return (val && IsaPointer() ) ? val : "";
}
//______________________________________________________________________________
Int_t TDataMember::GetMaxIndex(Int_t dim) const
{
// Return maximum index for array dimension "dim".
return fInfo->MaxIndex(dim);
}
//______________________________________________________________________________
const char *TDataMember::GetTypeName() const
{
// Get type of data member, e,g.: "class TDirectory*" -> "TDirectory".
if (fProperty==(-1)) Property();
return fTypeName.Data();
}
//______________________________________________________________________________
const char *TDataMember::GetFullTypeName() const
{
// Get full type description of data member, e,g.: "class TDirectory*".
if (fProperty==(-1)) Property();
return fFullTypeName.Data();
}
//______________________________________________________________________________
const char *TDataMember::GetTrueTypeName() const
{
// Get full type description of data member, e,g.: "class TDirectory*".
return fTrueTypeName.Data();
}
//______________________________________________________________________________
Int_t TDataMember::GetOffset() const
{
// Get offset from "this".
if (fOffset>=0) return fOffset;
//case of an interpreted or emulated class
if (fClass->GetDeclFileLine() < 0) {
((TDataMember*)this)->fOffset = fInfo->Offset();
return fOffset;
}
//case of a compiled class
//Note that the offset cannot be computed in case of an abstract class
//for which the list of real data has not yet been computed via
//a real daughter class.
char dmbracket[256];
sprintf(dmbracket,"%s[",GetName());
fClass->BuildRealData();
TIter next(fClass->GetListOfRealData());
TRealData *rdm;
Int_t offset = 0;
while ((rdm = (TRealData*)next())) {
char *rdmc = (char*)rdm->GetName();
//next statement required in case a class and one of its parent class
//have data members with the same name
if (this->IsaPointer() && rdmc[0] == '*') rdmc++;
if (rdm->GetDataMember() != this) continue;
if (strcmp(rdmc,GetName()) == 0) {
offset = rdm->GetThisOffset();
break;
}
if (strcmp(rdm->GetName(),GetName()) == 0) {
if (rdm->IsObject()) {
offset = rdm->GetThisOffset();
break;
}
}
if (strstr(rdm->GetName(),dmbracket)) {
offset = rdm->GetThisOffset();
break;
}
}
((TDataMember*)this)->fOffset = offset;
return fOffset;
}
//______________________________________________________________________________
Int_t TDataMember::GetOffsetCint() const
{
// Get offset from "this" using the information in CINT only.
return fInfo->Offset();
}
//______________________________________________________________________________
Int_t TDataMember::GetUnitSize() const
{
if (IsaPointer()) return sizeof(void*);
if (IsEnum() ) return sizeof(Int_t);
if (IsBasic() ) return GetDataType()->Size();
TClass *cl = gROOT->GetClass(GetTypeName());
if (!cl) cl = gROOT->GetClass(GetTrueTypeName());
if ( cl) return cl->Size();
Warning("GetUnitSize","Can not determine sizeof(%s)",GetTypeName());
return 0;
}
//______________________________________________________________________________
Bool_t TDataMember::IsBasic() const
{
// Return true if data member is a basic type, e.g. char, int, long...
if (fProperty == -1) Property();
return (fProperty & kIsFundamental) ? kTRUE : kFALSE;
}
//______________________________________________________________________________
Bool_t TDataMember::IsEnum() const
{
// Return true if data member is an enum.
if (fProperty == -1) Property();
return (fProperty & kIsEnum) ? kTRUE : kFALSE;
}
//______________________________________________________________________________
Bool_t TDataMember::IsaPointer() const
{
// Return true if data member is a pointer.
if (fProperty == -1) Property();
return (fProperty & kIsPointer) ? kTRUE : kFALSE;
}
//______________________________________________________________________________
int TDataMember::IsSTLContainer()
{
// The return type is defined in TDictionary (kVector, kList, etc.)
if (fSTLCont != -1) return fSTLCont;
fSTLCont = abs(TClassEdit::IsSTLCont(GetTrueTypeName()));
return fSTLCont;
}
//______________________________________________________________________________
Long_t TDataMember::Property() const
{
// Get property description word. For meaning of bits see EProperty.
if (fProperty!=(-1)) return fProperty;
TDataMember *t = (TDataMember*)this;
if (!fInfo) return 0;
t->fProperty = fInfo->Property()|fInfo->Type()->Property();
t->fTypeName = gInterpreter->TypeName(fInfo->Type()->Name());
t->fFullTypeName = fInfo->Type()->Name();
t->fName = fInfo->Name();
t->fTitle = fInfo->Title();
return fProperty;
}
//______________________________________________________________________________
TList *TDataMember::GetOptions() const
{
// Returns list of options - list of TOptionListItems
return fOptions;
}
//______________________________________________________________________________
TMethodCall *TDataMember::GetterMethod(TClass *cl)
{
// Return a TMethodCall method responsible for getting the value
// of data member. The cl argument specifies the class of the object
// which will be used to call this method (in case of multiple
// inheritance TMethodCall needs to know this to calculate the proper
// offset).
if (!fValueGetter || cl) {
if (!cl) cl = fClass;
if (fValueGetter) {
TString methodname = fValueGetter->GetMethodName();
delete fValueGetter;
fValueGetter = new TMethodCall(cl, methodname.Data(), "");
} else {
// try to guess Getter function:
// we strip the fist character of name of data field ('f') and then
// try to find the name of Getter by applying "Get", "Is" or "Has"
// as a prefix
const char *dataname = GetName();
char gettername[128];
sprintf(gettername, "Get%s", dataname+1);
if (GetClass()->GetMethod(gettername, ""))
return fValueGetter = new TMethodCall(cl, gettername, "");
sprintf(gettername, "Is%s", dataname+1);
if (GetClass()->GetMethod(gettername, ""))
return fValueGetter = new TMethodCall(cl, gettername, "");
sprintf(gettername, "Has%s", dataname+1);
if (GetClass()->GetMethod(gettername, ""))
return fValueGetter = new TMethodCall(cl, gettername, "");
}
}
return fValueGetter;
}
//______________________________________________________________________________
TMethodCall *TDataMember::SetterMethod(TClass *cl)
{
// Return a TMethodCall method responsible for setting the value
// of data member. The cl argument specifies the class of the object
// which will be used to call this method (in case of multiple
// inheritance TMethodCall needs to know this to calculate the proper
// offset).
if (!fValueSetter || cl) {
if (!cl) cl = fClass;
if (fValueSetter) {
TString methodname = fValueSetter->GetMethodName();
TString params = fValueSetter->GetParams();
delete fValueSetter;
fValueSetter = new TMethodCall(cl, methodname.Data(), params.Data());
} else {
// try to guess Setter function:
// we strip the fist character of name of data field ('f') and then
// try to find the name of Setter by applying "Set" as a prefix
const char *dataname = GetName();
char settername[64];
sprintf(settername, "Set%s", dataname+1);
if (strstr(settername, "Is")) sprintf(settername, "Set%s", dataname+3);
if (GetClass()->GetMethod(settername, "1"))
fValueSetter = new TMethodCall(cl, settername, "1");
if (!fValueSetter)
if (GetClass()->GetMethod(settername, "true"))
fValueSetter = new TMethodCall(cl, settername, "true");
}
}
return fValueSetter;
}
//______________________________________________________________________________
TOptionListItem::TOptionListItem(TDataMember *d, Long_t val, Long_t valmask,
Long_t tglmask,const char *name, const char *label)
{
fDataMember = d;
fValue = val;
fValueMaskBit = valmask;
fToggleMaskBit = tglmask;
if (name){
fOptName = new char[strlen(name)+1];
strcpy(fOptName,name);
} else fOptName = 0;
if(label){
fOptLabel = new char[strlen(label)+1];
strcpy(fOptLabel,label);
} else fOptLabel = 0;
}
//______________________________________________________________________________
TOptionListItem::~TOptionListItem()
{
if (fOptName) delete [] fOptName;
if (fOptLabel) delete [] fOptLabel;
}
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