OffsetPartDataSource.hpp
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00001 /***************************************************************************
00002   tag: The SourceWorks  Tue Sep 7 00:55:18 CEST 2010  OffsetPartDataSource.hpp
00003 
00004                         OffsetPartDataSource.hpp -  description
00005                            -------------------
00006     begin                : Tue September 07 2010
00007     copyright            : (C) 2010 The SourceWorks
00008     email                : peter@thesourceworks.com
00009 
00010  ***************************************************************************
00011  *   This library is free software; you can redistribute it and/or         *
00012  *   modify it under the terms of the GNU General Public                   *
00013  *   License as published by the Free Software Foundation;                 *
00014  *   version 2 of the License.                                             *
00015  *                                                                         *
00016  *   As a special exception, you may use this file as part of a free       *
00017  *   software library without restriction.  Specifically, if other files   *
00018  *   instantiate templates or use macros or inline functions from this     *
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00020  *   produce an executable, this file does not by itself cause the         *
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00024  *   Public License.                                                       *
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00030  *                                                                         *
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00037 
00038 
00039 #ifndef ORO_OFFSETPARTDATASOURCE_HPP_
00040 #define ORO_OFFSETPARTDATASOURCE_HPP_
00041 
00042 #include "DataSource.hpp"
00043 
00044 namespace RTT
00045 {
00046     namespace internal
00047     {
00056         class OffsetDataSource
00057         : public DataSource<unsigned int>
00058         {
00059         public:
00060             typedef unsigned int offset_type;
00061 
00062             ~OffsetDataSource() {}
00063 
00064             typedef boost::intrusive_ptr<OffsetDataSource > shared_ptr;
00065 
00072             OffsetDataSource( offset_type size,
00073                               DataSource<unsigned int>::shared_ptr index,
00074                               DataSource<offset_type>::shared_ptr parent_offset)
00075                 : msize(size), mindex(index), mparent_offset(parent_offset)
00076             {
00077             }
00078 
00079             DataSource<offset_type>::result_t get() const
00080             {
00081                 // calculates the location of the element sequence.
00082                 if (mparent_offset)
00083                     return mdata = msize * mindex->get() + mparent_offset->get();
00084                 return mdata = msize * mindex->get();
00085             }
00086 
00087             DataSource<offset_type>::result_t value() const
00088             {
00089                 return mdata;
00090             }
00091 
00092             DataSource<offset_type>::const_reference_t rvalue() const
00093             {
00094                 return mdata;
00095             }
00096 
00097             virtual OffsetDataSource* clone() const {
00098                 return new OffsetDataSource(msize, mindex, mparent_offset);
00099             }
00100 
00101             virtual OffsetDataSource* copy( std::map<const base::DataSourceBase*, base::DataSourceBase*>& replace ) const {
00102                 // if somehow a copy exists, return the copy, otherwise return this (see Attribute copy)
00103                 if ( replace[this] != 0 ) {
00104                     assert ( dynamic_cast<OffsetDataSource*>( replace[this] ) == static_cast<OffsetDataSource*>( replace[this] ) );
00105                     return static_cast<OffsetDataSource*>( replace[this] );
00106                 }
00107                 // Other pieces in the code rely on insertion in the map :
00108                 replace[this] = new OffsetDataSource(msize, mindex->copy(replace), mparent_offset->copy(replace));
00109                 // return this instead of a copy.
00110                 return static_cast<OffsetDataSource*>(replace[this]);
00111 
00112             }
00113         private:
00114             // size of one element.
00115             const unsigned int msize;
00116             mutable unsigned int mdata;
00117             // [] index
00118             DataSource<unsigned int>::shared_ptr mindex;
00119             // parent offset
00120             DataSource<offset_type>::shared_ptr mparent_offset;
00121         };
00122 
00138         template<typename T>
00139         class OffsetPartDataSource
00140         : public AssignableDataSource<T>
00141         {
00142             // a reference to a value_t
00143             typename AssignableDataSource<T>::value_t* mref;
00144             // [] index
00145             DataSource<unsigned int>::shared_ptr mindex;
00146             // parent data source, for updating after set().
00147             base::DataSourceBase::shared_ptr mparent;
00148             // offset in memory, calculated by external means.
00149             DataSource<unsigned int>::shared_ptr moffset;
00150         public:
00151             ~OffsetPartDataSource();
00152 
00153             typedef boost::intrusive_ptr<OffsetPartDataSource<T> > shared_ptr;
00154 
00163             OffsetPartDataSource( typename AssignableDataSource<T>::reference_t ref,
00164                                     DataSource<unsigned int>::shared_ptr index,
00165                                     base::DataSourceBase::shared_ptr parent,
00166                                     DataSource<unsigned int>::shared_ptr offset)
00167                 : mref(&ref), mindex(index), mparent(parent), moffset( offset)
00168             {
00169             }
00170 
00171             typename DataSource<T>::result_t get() const
00172             {
00173                 // calculates the location of the element sequence.
00174                 return static_cast<T*>( static_cast<void*>(mref) + moffset->get() )[ mindex->get() ];
00175             }
00176 
00177             typename DataSource<T>::result_t value() const
00178             {
00179                 return get();
00180             }
00181 
00182             void set( typename AssignableDataSource<T>::param_t t )
00183             {
00184                 set() = t;
00185                 updated();
00186             }
00187 
00188             typename AssignableDataSource<T>::reference_t set()
00189             {
00190                 // calculates the location of the element sequence.
00191                 return static_cast<T*>( static_cast<void*>(mref) + moffset->get() )[ mindex->get() ];
00192             }
00193 
00194             typename AssignableDataSource<T>::const_reference_t rvalue() const
00195             {
00196                 // calculates the location of the element sequence.
00197                 return static_cast<T*>( static_cast<void*>(mref) + moffset->get() )[ mindex->get() ];
00198             }
00199 
00200             void updated() {
00201                 mparent->updated();
00202             }
00203 
00210             virtual shared_ptr getParent() {
00211                 return mparent;
00212             }
00213 
00214 
00215             virtual OffsetPartDataSource<T>* clone() const {
00216                 return new OffsetPartDataSource<T>(mref, mindex, mparent, moffset);
00217             }
00218 
00219             virtual OffsetPartDataSource<T>* copy( std::map<const base::DataSourceBase*, base::DataSourceBase*>& replace ) const {
00220                 // if somehow a copy exists, return the copy, otherwise return this (see Attribute copy)
00221                 if ( replace[this] != 0 ) {
00222                     assert ( dynamic_cast<OffsetPartDataSource<T>*>( replace[this] ) == static_cast<OffsetPartDataSource<T>*>( replace[this] ) );
00223                     return static_cast<OffsetPartDataSource<T>*>( replace[this] );
00224                 }
00225                 // Other pieces in the code rely on insertion in the map :
00226                 replace[this] = new OffsetPartDataSource<T>(mref, mindex->copy(replace), mparent->copy(replace), moffset->copy(replace));
00227                 // return this instead of a copy.
00228                 return static_cast<OffsetPartDataSource<T>*>(replace[this]);
00229 
00230             }
00231         };
00232 
00233     }
00234 }
00235 
00236 #endif /* ORO_PARTDATASOURCE_HPP_ */


rtt
Author(s): RTT Developers
autogenerated on Thu Jan 2 2014 11:35:22