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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkOffsetsManagerArray.h,v $
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/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 notice for more information.
=========================================================================*/
// .NAME OffsetsManager - Helper class due to PIMPL excess
// .SECTION Description
// This class is deisgned to work within vtkXMLWriter. It store a position
// in a file (unsigned long) and associate a offset in the file. This is
// usefull when writting TimeStep XML file when you want to forward the
// same offset from the AppendData section on every entry in let say
// <Points> definition
// Example:
// <Points>
// <DataArray type="Float32" TimeStep="0" format="appended" offset="268" />
// <DataArray type="Float32" TimeStep="1" format="appended" offset="268" />
// ...
// </Points>
// Therefore data is only stored once in the XML file. At read time the
// offset value is stored to determine whenever we need to read data
// (ie when offset different from previously stored offset)
// .SECTION See Also
// vtkXMLWriter
// .SECTION Warning
// Do not include this file in a header file, it will break PIMPL convention
#ifndef vtkOffsetsManager_DoNotInclude
#error "do not include unless you know what you are doing"
#endif
#ifndef __vtkOffsetsManagerArray_h
#define __vtkOffsetsManagerArray_h
#include "vtkSystemIncludes.h"
#include <vtkstd/vector>
#include <assert.h>
//----------------------------------------------------------------------------
class OffsetsManager
{
public:
// Construct with default (unsigned long)-1 MTime
OffsetsManager()
{
this->LastMTime = (unsigned long)-1; //almost invalid state
}
~OffsetsManager()
{
}
void Allocate(int numTimeStep)
{
assert( numTimeStep > 0);
this->Positions.resize(numTimeStep);
this->OffsetValues.resize(numTimeStep);
}
unsigned long &GetPosition(unsigned int t)
{
assert( t < this->Positions.size());
return this->Positions[t];
}
unsigned long &GetOffsetValue(unsigned int t)
{
assert( t < this->OffsetValues.size());
return this->OffsetValues[t];
}
unsigned long &GetLastMTime()
{
return this->LastMTime;
}
private:
unsigned long LastMTime; // Previously written dataarray mtime
vtkstd::vector<unsigned long> Positions; // Position in the stream to write the offset
vtkstd::vector<unsigned long> OffsetValues; // Value of offset
};
//----------------------------------------------------------------------------
class OffsetsManagerGroup
{
public:
// This is kind of a hack since we need to consider both the case of Points with
// only one array over time and PointData with possibly multiple array over time
// therefore we need to use a OffsetsManagerGroup for representing offset from
// Points but OffsetsManagerArray for PointData. In both case the toplevel structure
// is a container of Pieces...
OffsetsManager &GetPiece(unsigned int index)
{
assert( index < this->Internals.size());
OffsetsManager &e = this->Internals[index];
return e;
}
// GetElement should be used when manipulating a OffsetsManagerArray
OffsetsManager &GetElement(unsigned int index)
{
// commenting the following out, this is an heisenbug which only appears on gcc
// when exporting GLIBCPP_NEW=1. If you try to print the value or run through gdb
// it desepears
//assert( index < this->Internals.size());
OffsetsManager &e = this->Internals[index];
return e;
}
unsigned int GetNumberOfElements()
{
return this->Internals.size();
}
void Allocate(int numElements)
{
assert(numElements >= 0); //allow 0 for empty FieldData
this->Internals.resize(numElements);
}
void Allocate(int numElements, int numTimeSteps)
{
assert(numElements > 0);
assert(numTimeSteps > 0);
this->Internals.resize(numElements);
for(int i=0; i<numElements; i++)
{
this->Internals[i].Allocate(numTimeSteps);
}
}
private:
vtkstd::vector<OffsetsManager> Internals;
};
//----------------------------------------------------------------------------
class OffsetsManagerArray
{
public:
OffsetsManagerGroup &GetPiece(unsigned int index)
{
assert( index < this->Internals.size());
return this->Internals[index];
}
void Allocate(int numPieces)
{
assert(numPieces > 0);
// Force re-initialization of values.
this->Internals.resize(0);
this->Internals.resize(numPieces);
}
void Allocate(int numPieces, int numElements, int numTimeSteps)
{
assert(numPieces > 0);
assert(numElements > 0);
assert(numTimeSteps > 0);
// Force re-initialization of values.
this->Internals.resize(0);
this->Internals.resize(numPieces);
for(int i=0; i<numPieces; i++)
{
this->Internals[i].Allocate(numElements, numTimeSteps);
}
}
private:
vtkstd::vector<OffsetsManagerGroup> Internals;
};
#endif
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