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00001 #ifndef CommonTools_UtilAlgos_MasterCollectionHelper_h 00002 #define CommonTools_UtilAlgos_MasterCollectionHelper_h 00003 /* \class helper::MasterCollection<C> 00004 * 00005 * differentiate index addressing in case of edm::View 00006 * since a View retrieving a collection of reference 00007 * would have referece indices (key()) pointing to the master 00008 * collection different from reference position into the view 00009 * 00010 * \author Luca Lista, INFN 00011 * 00012 * \version $Id: MasterCollectionHelper.h,v 1.1 2009/03/03 13:07:26 llista Exp $ 00013 * 00014 */ 00015 #include "DataFormats/Common/interface/Handle.h" 00016 #include "DataFormats/Common/interface/View.h" 00017 #include "DataFormats/Common/interface/RefToBaseProd.h" 00018 00019 namespace helper { 00020 template<typename C1> 00021 struct MasterCollection { 00022 typedef edm::Ref<C1> ref_type; 00023 explicit MasterCollection(const edm::Handle<C1> & handle) : 00024 handle_(handle) { } 00025 size_t size() const { return handle_->size(); } 00026 size_t index(size_t i) const { return i; } 00027 const edm::Handle<C1> & get() const { return handle_; } 00028 ref_type getRef(size_t idx) const { return ref_type(get(), idx); } 00029 template<typename R> 00030 R getConcreteRef(size_t idx) const { return getRef(idx); } 00031 private: 00032 edm::Handle<C1> handle_; 00033 }; 00034 00035 template<typename T> 00036 struct MasterCollection<edm::View<T> > { 00037 typedef edm::RefToBase<T> ref_type; 00038 explicit MasterCollection(const edm::Handle<edm::View<T> > & handle) : 00039 handle_(handle) { 00040 if(handle_->size() != 0) 00041 ref_ = edm::RefToBaseProd<T>(handle_->refAt(0)); 00042 } 00043 size_t size() const { 00044 if (ref_.isNull()) return 0; 00045 return ref_->size(); 00046 } 00047 size_t index(size_t i) const { 00048 return handle_->refAt(i).key(); 00049 } 00050 const edm::RefToBaseProd<T> & get() const { return ref_; } 00051 ref_type getRef(size_t idx) const { return ref_type(get(), idx); } 00052 template<typename R> 00053 R getConcreteRef(size_t idx) const { return getRef(idx).template castTo<R>(); } 00054 private: 00055 edm::Handle<edm::View<T> > handle_; 00056 edm::RefToBaseProd<T> ref_; 00057 }; 00058 00059 } 00060 00061 #endif
1.7.3