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00025 #include <cstddef>
00026
00027 #include <sstream>
00028 #include <string>
00029
00030 #include <boost/shared_ptr.hpp>
00031
00032 #include "../common/exceptions/WOutOfBounds.h"
00033 #include "../common/math/linearAlgebra/WLinearAlgebra.h"
00034 #include "WEEGPositionsLibrary.h"
00035 #include "WEEGChannelInfo.h"
00036 #include "exceptions/WDHException.h"
00037 #include "io/WPagerEEG.h"
00038
00039
00040 WEEGChannelInfo::WEEGChannelInfo( std::size_t channelID,
00041 boost::shared_ptr< WPagerEEG > pager,
00042 boost::shared_ptr< WEEGPositionsLibrary > positionsLibrary )
00043 {
00044 if( !pager )
00045 {
00046 throw WDHException( std::string( "Couldn't construct new EEG channel info: pager invalid" ) );
00047 }
00048
00049 if( !positionsLibrary )
00050 {
00051 throw WDHException( std::string( "Couldn't construct new EEG channel info: positions library invalid" ) );
00052 }
00053
00054 if( channelID >= pager->getNumberOfChannels() )
00055 {
00056 std::ostringstream stream;
00057 stream << "The EEG has no channel number " << channelID;
00058 throw WOutOfBounds( stream.str() );
00059 }
00060
00061 m_unit = pager->getChannelUnit( channelID );
00062 m_label = pager->getChannelLabel( channelID );
00063
00064 try
00065 {
00066 m_position = positionsLibrary->getPosition( m_label );
00067 m_hasPosition = true;
00068 }
00069 catch( const WOutOfBounds& )
00070 {
00071 m_hasPosition = false;
00072 }
00073 }
00074
00075 std::string WEEGChannelInfo::getUnit() const
00076 {
00077 return m_unit;
00078 }
00079
00080 std::string WEEGChannelInfo::getLabel() const
00081 {
00082 return m_label;
00083 }
00084
00085 WPosition WEEGChannelInfo::getPosition() const throw( WDHException )
00086 {
00087 if( m_hasPosition )
00088 {
00089 return m_position;
00090 }
00091 else
00092 {
00093 throw WDHException( std::string( "The position of this electrode is unknown." ) );
00094 }
00095 }