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/*=========================================================================
Program: Image Guided Surgery Software Toolkit
Module: $RCSfile: igstkTransformXMLFileReaderBase.cxx,v $
Language: C++
Date: $Date: 2009-01-30 20:49:54 $
Version: $Revision: 1.1 $
Copyright (c) ISC Insight Software Consortium. All rights reserved.
See IGSTKCopyright.txt or http://www.igstk.org/copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#include <itksys/SystemTools.hxx>
#include <algorithm>
#include "igstkTransformXMLFileReaderBase.h"
namespace igstk
{
int
TransformXMLFileReaderBase::CanReadFile(const char* name)
{
//check that we have a valid file name, it is not a directory, and the
//file exists
if(itksys::SystemTools::FileLength( name ) == 0 ||
!itksys::SystemTools::FileExists( name ) ||
itksys::SystemTools::FileIsDirectory( name ))
return 0;
return 1;
}
void
TransformXMLFileReaderBase::StartElement( const char * name,
const char **atts )
{
if( itksys::SystemTools::Strucmp( name, "precomputed_transform" ) == 0 )
{
//there can only be one "precomputed_transform" per xml file
if( HaveTransformData() )
{
throw FileFormatException(
std::string( "The tag \"precomputed_transform\" appears multiple times,\
should only appear once." ) );
}
this->m_ReadingTransformData = true;
}
else if( itksys::SystemTools::Strucmp( name, "description" ) == 0 ||
itksys::SystemTools::Strucmp( name, "computation_date" ) == 0 ||
itksys::SystemTools::Strucmp( name, "transformation" ) == 0 )
{
if( this->m_ReadingTagData )
{
throw FileFormatException( "Nested tags are not allowed." );
}
else
{
this->m_ReadingTagData = true;
}
//if this is the "transformation" tag then it can have an
//"estimation_error" attribute, check for it here
if( itksys::SystemTools::Strucmp( name, "transformation" ) == 0 )
{
ProcessTransformationAttributes( atts );
}
}
}
void
TransformXMLFileReaderBase::EndElement( const char *name )
{
//trim the tag's data string
size_t startpos = this->m_CurrentTagData.find_first_not_of(" \t\n\r");
size_t endpos = this->m_CurrentTagData.find_last_not_of(" \t\n\r");
if( startpos == std::string::npos || endpos == std::string::npos )
{
this->m_CurrentTagData.clear();
}
else
{
this->m_CurrentTagData = this->m_CurrentTagData.substr( startpos,
endpos-startpos+1 );
}
//replace all newlines ('\n') and carriage returns ('\r') with space
std::replace( this->m_CurrentTagData.begin(),
this->m_CurrentTagData.end(),
'\n', ' ' );
std::replace( this->m_CurrentTagData.begin(),
this->m_CurrentTagData.end(),
'\r', ' ' );
if( itksys::SystemTools::Strucmp( name, "precomputed_transform" ) == 0 )
{
this->m_ReadingTransformData = false;
//see that we got all the data, perhaps replace with a more
//specific message with regard to the missing tag(s)
if( !HaveTransformData() )
{
throw FileFormatException( std::string( "Missing tag(s) in xml file." ) );
}
} //tags are expected to be inside the "precomputed_transform" tag
if( this->m_ReadingTransformData )
{
if( itksys::SystemTools::Strucmp( name, "description" ) == 0 )
{
ProcessDescription();
this->m_HaveDescription = true;
}
else if( itksys::SystemTools::Strucmp( name, "computation_date" ) == 0 )
{
ProcessDate();
this->m_HaveDate = true;
}
else if( itksys::SystemTools::Strucmp( name, "transformation" ) == 0 )
{
ProcessTransformation();
this->m_HaveTransform = true;
}
//done processing, clear the current tag's data
this->m_CurrentTagData.clear();
this->m_ReadingTagData = false;
}
}
void
TransformXMLFileReaderBase::CharacterDataHandler(
const char *inData,
int inLength )
{
this->m_CurrentTagData.append( inData, inLength );
}
bool
TransformXMLFileReaderBase::HaveTransformData()
{
return ( this->m_HaveDescription && this-> m_HaveDate &&
this->m_HaveTransform && this->m_HaveError );
}
igstk::PrecomputedTransformData::Pointer
TransformXMLFileReaderBase::GetTransformData()
{
igstk::PrecomputedTransformData::Pointer transformData =
igstk::PrecomputedTransformData::New();
transformData->RequestInitialize( this->m_Transform,
this->m_Date,
this->m_Description,
this->m_EstimationError );
return transformData;
}
void
TransformXMLFileReaderBase::ProcessDescription()
throw ( FileFormatException )
{
if( this->m_CurrentTagData.empty() )
{
throw FileFormatException("Transformation description is missing.");
}
else
{
this->m_Description = this->m_CurrentTagData;
}
}
void
TransformXMLFileReaderBase::ProcessDate()
throw ( FileFormatException )
{
if( this->m_CurrentTagData.empty() )
{
throw FileFormatException("Computation date is missing.");
}
else
{
this->m_Date = this->m_CurrentTagData;
}
}
void
TransformXMLFileReaderBase::ProcessTransformationAttributes(
const char ** atts )
throw ( FileFormatException )
{
//go over all the attribute-value pairs
for( int i=0; atts[i] != NULL; i+=2 )
{
if( itksys::SystemTools::Strucmp( atts[i], "estimation_error" ) == 0 )
{
PrecomputedTransformData::ErrorType tmp;
std::istringstream instr;
instr.str( atts[i+1] );
instr>>tmp;
//check that we got to the end of the stream, we expect a single value
//here (assumes that the string err has no trailing white spaces)
if(!instr.eof())
{
throw FileFormatException("Estimation error format is invalid.");
}
else
{
this->m_EstimationError = tmp;
}
this->m_HaveError = true;
}
}
}
} //namespace
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