TLeafElement.cxx

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// @(#)root/tree:$Id$
// Author: Rene Brun   14/01/2001
 
/*************************************************************************
 * 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.             *
 *************************************************************************/
 
/** \class TLeafElement
\ingroup tree
 
A TLeaf for the general case when using the branches created via
a TStreamerInfo (i.e. using TBranchElement).
*/
 
#include "TLeafElement.h"
 
#include "TVirtualStreamerInfo.h"
#include "Bytes.h"
#include "TBuffer.h"
 
ClassImp(TLeafElement);
 
////////////////////////////////////////////////////////////////////////////////
/// Default constructor for LeafObject.
 
TLeafElement::TLeafElement(): TLeaf()
{
   fAbsAddress = nullptr;
   fID   = -1;
   fType = -1;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create a LeafObject.
 
TLeafElement::TLeafElement(TBranch *parent, const char *name, Int_t id, Int_t type)
   : TLeaf(parent, name,name)
{
   fLenType    = 0;
   fAbsAddress = nullptr;
   fID         = id;
   fType       = type;
   if (type < TVirtualStreamerInfo::kObject) {
      Int_t bareType = type;
      if (bareType > TVirtualStreamerInfo::kOffsetP)
         bareType -= TVirtualStreamerInfo::kOffsetP;
      else if (bareType > TVirtualStreamerInfo::kOffsetL)
         bareType -= TVirtualStreamerInfo::kOffsetL;
 
      if ((bareType >= TVirtualStreamerInfo::kUChar && bareType <= TVirtualStreamerInfo::kULong)
          || bareType == TVirtualStreamerInfo::kULong64)
      {
         SetUnsigned();
      }
 
      auto bareTypeCopy = static_cast<EDataType>(bareType);
      switch (bareTypeCopy) {
         case kChar_t: // fall-through
         case kUChar_t: // fall-through
         case kchar: // fall-through
         case kBool_t:
            fLenType = 1;
            break;
         case kShort_t: // fall-through
         case kUShort_t: // fall-through
         case kFloat16_t:
            fLenType = 2;
            break;
         case kFloat_t: // fall-through
         case kDouble32_t: // fall-through
         case kInt_t: // fall-through
         case kUInt_t:
            fLenType = 4;
            break;
         case kLong_t: // fall-through
         case kULong_t: // fall-through
         case kLong64_t: // fall-through
         case kULong64_t: // fall-through
         case kDouble_t:
            fLenType = 8;
            break;
         // All cases I don't know how to handle.
         case kOther_t: // fall-through
         case kNoType_t: // fall-through
         case kCounter: // fall-through
         case kCharStar: // fall-through
         case kBits: // fall-through
         case kVoid_t: // fall-through
         case kDataTypeAliasUnsigned_t: // fall-through
         case kDataTypeAliasSignedChar_t: // fall-through
         case kNumDataTypes: // fall-through
            fLenType = 0;
      };
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Default destructor for a LeafObject.
 
TLeafElement::~TLeafElement()
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Determine if this TLeafElement supports bulk IO
TLeaf::DeserializeType
TLeafElement::GetDeserializeType() const
{
   if (R__unlikely(fDeserializeTypeCache.load(std::memory_order_relaxed) != DeserializeType::kInvalid))
      return fDeserializeTypeCache;
 
   TClass *clptr = nullptr;
   EDataType type = EDataType::kOther_t;
   if (fBranch->GetExpectedType(clptr, type)) {  // Returns non-zero in case of failure
      fDeserializeTypeCache.store(DeserializeType::kExternal, std::memory_order_relaxed);
      return DeserializeType::kExternal;  // I don't know what it is, but we aren't going to use bulk IO.
   }
   fDataTypeCache.store(type, std::memory_order_release);
   if (clptr) {  // Something that requires a dictionary to read; skip.
      fDeserializeTypeCache.store(DeserializeType::kExternal, std::memory_order_relaxed);
      return DeserializeType::kExternal;
   }
 
   if ((fType == EDataType::kChar_t) || fType == EDataType::kUChar_t || type == EDataType::kBool_t) {
      fDeserializeTypeCache.store(DeserializeType::kZeroCopy, std::memory_order_relaxed);
      return DeserializeType::kZeroCopy;
   } else if ((type == EDataType::kFloat_t) || (type == EDataType::kDouble_t) ||
              (type == EDataType::kInt_t) || (type == EDataType::kUInt_t) ||
              (type == EDataType::kLong64_t) || (type == EDataType::kULong64_t)) {
      fDeserializeTypeCache.store(DeserializeType::kInPlace, std::memory_order_relaxed);
      return DeserializeType::kInPlace;
   }
 
   fDeserializeTypeCache.store(DeserializeType::kExternal, std::memory_order_relaxed);
   return DeserializeType::kExternal;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Deserialize N events from an input buffer.
bool TLeafElement::ReadBasketFast(TBuffer &input_buf, Long64_t N)
{
   if (R__unlikely(fDeserializeTypeCache.load(std::memory_order_relaxed) == DeserializeType::kInvalid))
      GetDeserializeType(); // Set fDataTypeCache if need be.
   EDataType type = fDataTypeCache.load(std::memory_order_consume);
   return input_buf.ByteSwapBuffer(fLen*N, type);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Returns pointer to method corresponding to name name is a string
/// with the general form "method(list of params)" If list of params is
/// omitted, () is assumed;
 
TMethodCall *TLeafElement::GetMethodCall(const char * /*name*/)
{
   return nullptr;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the full name (including the parent's branch names) of the leaf.
 
TString TLeafElement::GetFullName() const
{
   TBranchElement *br = static_cast<TBranchElement*>(GetBranch());
   if (br->GetType() == 3 || br->GetType() == 4) {
      TString bname(br->GetFullName());
      if (bname.Length() && bname[bname.Length()-1]=='.')
         bname.Remove(bname.Length()-1);
      return bname + "_";
   } else
      return GetBranch()->GetFullName();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Copy/set fMinimum and fMaximum to include/be wide than those of the parameter
 
bool TLeafElement::IncludeRange(TLeaf *input)
{
    if (input) {
        if (input->GetMaximum() > this->GetMaximum())
            ((TBranchElement*)fBranch)->fMaximum = input->GetMaximum();
        return true;
    } else {
        return false;
    }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return true if this leaf is does not have any sub-branch/leaf.
 
bool TLeafElement::IsOnTerminalBranch() const
{
   if (fBranch->GetListOfBranches()->GetEntriesFast()) return false;
   return true;
}