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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkFEMLightObject.cxx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/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.
=========================================================================*/
// disable debug warnings in MS compiler
#ifdef _MSC_VER
#pragma warning(disable: 4786)
#endif
#include "itkFEMLightObject.h"
#include "itkNumericTraits.h"
namespace itk {
namespace fem {
/**
* Here we just read the global number from the stream.
* This should be the first function called when reading object data.
*/
void FEMLightObject::Read( std::istream& f, void* )
{
int n;
/** Read and set the global object number */
this->SkipWhiteSpace(f); f>>n; if(!f) { goto out; }
this->GN=n;
out:
if( !f )
{
throw FEMExceptionIO(__FILE__,__LINE__,"FEMLightObject::Read","Error reading FEM object!");
}
}
/**
* Here we just write the class name and GN.
* This should be the first function called when writing object data, so
* every derived class should first call the parent's write function.
* The Write function in base (this one) class knows which class is
* being written by calling the virtual ClassID() function and can write
* the class name properly.
*/
void FEMLightObject::Write( std::ostream& f ) const
{
// first write the class name
f<<'<'<<FEMObjectFactory<Self>::ID2ClassName(this->ClassID())<<">\n";
// then the global object number
f<<"\t"<<GN<<"\t% Global object number\n";
// check for errors
if (!f)
{
throw FEMExceptionIO(__FILE__,__LINE__,"FEMLightObject::Write","Error writing FEM object!");
}
}
/**
* Read and create object of any derived class from stream
*/
FEMLightObject::Pointer
FEMLightObject::
CreateFromStream( std::istream& f, void *info )
{
// local variables
std::streampos l(0);
char buf[256];
std::string s;
std::string::size_type b,e;
int clID;
FEMLightObject::Pointer a=0;
std::string errorMessage;
start:
#ifndef __sgi
l=f.tellg(); // remember the stream position
#endif
SkipWhiteSpace(f); // skip comments and whitespaces
if ( f.eof() ) return 0; // end of stream. all was good
char c;
if ( (c = f.get()) != '<' )
{
std::string rest;
std::getline(f,rest);
errorMessage = "Expected < token not found. Instead found '";
errorMessage += c;
errorMessage += "'.\nRest of line is '";
errorMessage += rest;
errorMessage += "'.\n";
goto out; // we expect a token
}
f.getline(buf,256,'>'); // read up to 256 characters until '>' is reached. we read and discard the '>'
s=std::string(buf);
// get rid of the whitespaces in front of and the back of token
b=s.find_first_not_of(whitespaces); // end of whitespaces in the beginning
if ( (e=s.find_first_of(whitespaces,b)) == std::string::npos ) // beginning of whitespaces at the end
{
e=s.size();
}
s=s.substr(b,e-b);
if ( s=="END" )
{
/*
* We can ignore this token. Start again by reading the next object.
*/
goto start;
}
clID=FEMOF::ClassName2ID(s); // obtain the class ID from FEMObjectFactory
if (clID<0)
{
errorMessage = "Could not obtain class ID from FEMObjectFactory for '";
errorMessage += s;
errorMessage += "'.";
goto out; // class not found
}
// create a new object of the correct class
a=FEMOF::Create(clID);
if (!a)
{
errorMessage = "Error creating new object of the derived class";
goto out; // error creating new object of the derived class
}
/*
* Now we have to read additional data, which is
* specific to the class of object we just created
*/
try
{
a->Read(f,info);
}
/**
* Catch possible exceptions while
* reading object's data from stream
*/
catch (...)
{
#ifndef FEM_USE_SMART_POINTERS
delete a; // if something went wrong, we need to destroy the already created object
#endif
a=0;
throw; // rethrow the same exception
}
/**
* Return a pointer to a newly created object if all was OK
* Technically everithing should be fine here (a!=0), but we
* check again, just in case.
*/
if (a) { return a; }
out:
/**
* Something went wrong.
* Reset the stream position to where it was before reading the object.
*/
#ifndef __sgi
f.seekg(l);
#endif
/*
* Throw an IO exception
*/
throw FEMExceptionIO(__FILE__,__LINE__,"FEMLightObject::ReadAnyObjectFromStream()",errorMessage);
}
// Helper function to skip all whitespaces and comments in input stream
void
FEMLightObject::
SkipWhiteSpace(std::istream& f)
{
std::string skip;
while(f && !f.eof() && (std::ws(f).peek()) == '%' )
{
std::getline(f,skip);
}
}
// string containing all whitespace characters
const std::string
FEMLightObject
::whitespaces=" \t\n\r";
}} // end namespace itk::fem
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