# gdcmDataSet.h

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    00001 /*=========================================================================
    00002
    00003   Program: GDCM (Grassroots DICOM). A DICOM library
    00004   Module:  $URL$
    00005
    00006   Copyright (c) 2006-2010 Mathieu Malaterre
    00007   All rights reserved.
    00008   See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
    00009
    00010      This software is distributed WITHOUT ANY WARRANTY; without even
    00011      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
    00012      PURPOSE.  See the above copyright notice for more information.
    00013
    00014 =========================================================================*/
    00015 #ifndef GDCMDATASET_H
    00016 #define GDCMDATASET_H
    00017
    00018 #include "gdcmDataElement.h"
    00019 #include "gdcmTag.h"
    00020 #include "gdcmVR.h"
    00021 #include "gdcmElement.h"
    00022
    00023 #include <set>
    00024 #include <iterator>
    00025
    00026 namespace gdcm
    00027 {
    00028 class GDCM_EXPORT DataElementException : public std::exception {};
    00029
    00030 class PrivateTag;
    00055 class GDCM_EXPORT DataSet
    00056 {
    00057   friend class CSAHeader;
    00058 public:
    00059   typedef std::set<DataElement> DataElementSet;
    00060   typedef DataElementSet::const_iterator ConstIterator;
    00061   typedef DataElementSet::iterator Iterator;
    00062   typedef DataElementSet::size_type SizeType;
    00063   //typedef typename DataElementSet::iterator iterator;
    00064   ConstIterator Begin() const { return DES.begin(); }
    00065   Iterator Begin() { return DES.begin(); }
    00066   ConstIterator End() const { return DES.end(); }
    00067   Iterator End() { return DES.end(); }
    00068   const DataElementSet &GetDES() const { return DES; }
    00069   DataElementSet &GetDES() { return DES; }
    00070   void Clear() {
    00071     DES.clear();
    00072     assert( DES.empty() );
    00073   }
    00074
    00075   unsigned int Size() const {
    00076     return DES.size();
    00077   }
    00078
    00079   void Print(std::ostream &os, std::string const &indent = "") const {
    00080     // CT_Phillips_JPEG2K_Decompr_Problem.dcm has a SQ of length == 0
    00081     //int s = DES.size();
    00082     //assert( s );
    00083     //std::copy(DES.begin(), DES.end(),
    00084     //  std::ostream_iterator<DataElement>(os, "\n"));
    00085     ConstIterator it = DES.begin();
    00086     for( ; it != DES.end(); ++it)
    00087       {
    00088       os << indent << *it << "\n";
    00089       }
    00090   }
    00091
    00092   template <typename TDE>
    00093   unsigned int ComputeGroupLength(Tag const &tag) const
    00094     {
    00095     assert( tag.GetElement() == 0x0 );
    00096     const DataElement r(tag);
    00097     ConstIterator it = DES.find(r);
    00098     unsigned int res = 0;
    00099     for( ++it; it != DES.end()
    00100       && it->GetTag().GetGroup() == tag.GetGroup(); ++it)
    00101       {
    00102       assert( it->GetTag().GetElement() != 0x0 );
    00103       assert( it->GetTag().GetGroup() == tag.GetGroup() );
    00104       res += it->GetLength<TDE>();
    00105       }
    00106     return res;
    00107     }
    00108
    00109   template <typename TDE>
    00110   VL GetLength() const {
    00111     if( DES.empty() ) return 0;
    00112     assert( !DES.empty() );
    00113     VL ll = 0;
    00114     assert( ll == 0 );
    00115     ConstIterator it = DES.begin();
    00116     for( ; it != DES.end(); ++it)
    00117       {
    00118       assert( !(it->GetLength<TDE>().IsUndefined()) );
    00119       VL len = it->GetLength<TDE>();
    00120       if ( it->GetTag() != Tag(0xfffe,0xe00d) )
    00121         {
    00122         ll += it->GetLength<TDE>();
    00123         }
    00124       }
    00125     return ll;
    00126   }
    00129   void Insert(const DataElement& de) {
    00130     // FIXME: there is a special case where a dataset can have value < 0x8, see:
    00131     // $ gdcmdump --csa gdcmData/SIEMENS-JPEG-CorruptFrag.dcm
    00132     if( de.GetTag().GetGroup() >= 0x0008 || de.GetTag().GetGroup() == 0x4 )
    00133       {
    00134       // prevent user error:
    00135       if( de.GetTag() == Tag(0xfffe,0xe00d)
    00136       || de.GetTag() == Tag(0xfffe,0xe0dd)
    00137       || de.GetTag() == Tag(0xfffe,0xe000) )
    00138         {
    00139         }
    00140       else
    00141         {
    00142         InsertDataElement( de );
    00143         }
    00144       }
    00145     else
    00146       {
    00147       gdcmErrorMacro( "Cannot add element with group < 0x0008 and != 0x4 in the dataset: " << de.GetTag() );
    00148       }
    00149   }
    00151   void Replace(const DataElement& de) {
    00152     if( DES.find(de) != DES.end() ) DES.erase(de);
    00153     Insert(de);
    00154   }
    00156   void ReplaceEmpty(const DataElement& de) {
    00157     ConstIterator it = DES.find(de);
    00158     if( it != DES.end() && it->IsEmpty() )
    00159       DES.erase(de);
    00160     Insert(de);
    00161   }
    00163   SizeType Remove(const Tag& tag) {
    00164     DataElementSet::size_type count = DES.erase(tag);
    00165     assert( count == 0 || count == 1 );
    00166     return count;
    00167   }
    00168
    00172   //DataElement& GetDataElement(const Tag &t) {
    00173   //  DataElement r(t);
    00174   //  Iterator it = DES.find(r);
    00175   //  if( it != DES.end() )
    00176   //    return *it;
    00177   //  return GetDEEnd();
    00178   //  }
    00179   const DataElement& GetDataElement(const Tag &t) const {
    00180     const DataElement r(t);
    00181     ConstIterator it = DES.find(r);
    00182     if( it != DES.end() )
    00183       return *it;
    00184     return GetDEEnd();
    00185     }
    00186   const DataElement& operator[] (const Tag &t) const { return GetDataElement(t); }
    00187   const DataElement& operator() (uint16_t group, uint16_t element) const { return GetDataElement( Tag(group,element) ); }
    00188
    00190   std::string GetPrivateCreator(const Tag &t) const;
    00191
    00193   bool FindDataElement(const PrivateTag &t) const;
    00195   const DataElement& GetDataElement(const PrivateTag &t) const;
    00196
    00197   // DUMB: this only search within the level of the current DataSet
    00198   bool FindDataElement(const Tag &t) const {
    00199     const DataElement r(t);
    00200     //ConstIterator it = DES.find(r);
    00201     if( DES.find(r) != DES.end() )
    00202       {
    00203       return true;
    00204       }
    00205     return false;
    00206     }
    00207
    00208   // WARNING:
    00209   // This only search at the same level as the DataSet is !
    00210   const DataElement& FindNextDataElement(const Tag &t) const {
    00211     const DataElement r(t);
    00212     ConstIterator it = DES.lower_bound(r);
    00213     if( it != DES.end() )
    00214       return *it;
    00215     return GetDEEnd();
    00216     }
    00217
    00219   bool IsEmpty() const { return DES.empty(); };
    00220
    00221   DataSet& operator=(DataSet const &val)
    00222   {
    00223     DES = val.DES;
    00224     return *this;
    00225   }
    00226
    00227 /*
    00228   template <typename TOperation>
    00229   void ExecuteOperation(TOperation & operation) {
    00230     assert( !DES.empty() );
    00231     DataElementSet::iterator it = Begin();
    00232     for( ; it != End(); ++it)
    00233       {
    00234       DataElement &de = (DataElement&)*it;
    00235       operation( de );
    00236       }
    00237   }
    00238 */
    00239
    00240   template <typename TDE, typename TSwap>
    00241   std::istream &ReadNested(std::istream &is);
    00242
    00243   template <typename TDE, typename TSwap>
    00244   std::istream &Read(std::istream &is);
    00245
    00246   template <typename TDE, typename TSwap>
    00247   std::istream &ReadUpToTag(std::istream &is, const Tag &t, std::set<Tag> const & skiptags);
    00248
    00249   template <typename TDE, typename TSwap>
    00250   std::istream &ReadUpToTagWithLength(std::istream &is, const Tag &t, VL & length);
    00251
    00252   template <typename TDE, typename TSwap>
    00253   std::istream &ReadSelectedTags(std::istream &is, const std::set<Tag> & tags);
    00254   template <typename TDE, typename TSwap>
    00255   std::istream &ReadSelectedTagsWithLength(std::istream &is, const std::set<Tag> & tags, VL & length);
    00256
    00257   template <typename TDE, typename TSwap>
    00258   std::ostream const &Write(std::ostream &os) const;
    00259
    00260   template <typename TDE, typename TSwap>
    00261   std::istream &ReadWithLength(std::istream &is, VL &length);
    00262
    00263 protected:
    00264   /* GetDEEnd is a Win32 only issue, one cannot use a dllexported
    00265    * static member data in an inline function, otherwise symbol
    00266    * will get reported as missing in any dll using the inlined function
    00267    */
    00268   const DataElement& GetDEEnd() const;
    00269
    00270   // This function is not safe, it does not check for the value of the tag
    00271   // so depending whether we are getting called from a dataset or file meta header
    00272   // the condition is different
    00273   void InsertDataElement(const DataElement& de) {
    00274     //if( de.GetTag() == Tag(0xfffe,0xe00d) ) return;
    00275     //if( de.GetTag() == Tag(0xfffe,0xe0dd) ) return;
    00276     std::pair<Iterator,bool> pr = DES.insert(de);
    00277 #ifndef NDEBUG
    00278     if( pr.second == false )
    00279       {
    00280       gdcmWarningMacro( "DataElement: " << de << " was already found, skipping duplicate entry.\n"
    00281         "Original entry kept is: " << *pr.first );
    00282       }
    00283 #endif
    00284     assert( de.IsEmpty() || de.GetVL() == de.GetValue().GetLength() );
    00285     }
    00286
    00287 protected:
    00288   // Internal function, that will compute the actual Tag (if found) of
    00289   // a requested Private Tag (XXXX,YY,"PRIVATE")
    00290   Tag ComputeDataElement(const PrivateTag & t) const;
    00291
    00292 private:
    00293   DataElementSet DES;
    00294   static DataElement DEEnd;
    00295   friend std::ostream& operator<<(std::ostream &_os, const DataSet &val);
    00296 };
    00297 //-----------------------------------------------------------------------------
    00298 inline std::ostream& operator<<(std::ostream &os, const DataSet &val)
    00299 {
    00300   val.Print(os);
    00301   return os;
    00302 }
    00303
    00304 #if defined(SWIGPYTHON) || defined(SWIGCSHARP) || defined(SWIGJAVA)
    00305 /*
    00306  * HACK: I need this temp class to be able to manipulate a std::set from python,
    00307  * swig does not support wrapping of simple class like std::set...
    00308  */
    00309 class SWIGDataSet
    00310 {
    00311 public:
    00312   SWIGDataSet(DataSet &des):Internal(des),it(des.Begin()) {}
    00313   const DataElement& GetCurrent() const { return *it; }
    00314   void Start() { it = Internal.Begin(); }
    00315   bool IsAtEnd() const { return it == Internal.End(); }
    00316   void Next() { ++it; }
    00317 private:
    00318   DataSet & Internal;
    00319   DataSet::ConstIterator it;
    00320 };
    00321 #endif /* SWIG */
    00322
    00328 } // end namespace gdcm
    00329
    00330 #include "gdcmDataSet.txx"
    00331
    00332 #endif //GDCMDATASET_H
    00333