/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkAttributeData.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
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   of any contributors may be used to endorse or promote products derived
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=========================================================================*/
// .NAME vtkAttributeData - abstract class defines API for attribute data
// .SECTION Description
// vtkAttributeData is an abstract class that defines an API and methods
// to support attribute data such as scalars, vectors, tensors, etc. The
// class works by managing an underlying data array. This data array can 
// be explicitly set or alternatively, created by the object. You can
// control the type of the underlying data, if necessary.

// .SECTION See Also
// vtkPoints vtkScalars vtkVectors vtkNormals vtkTCoords vtkTensors vtkFieldData

#ifndef __vtkAttributeData_h
#define __vtkAttributeData_h

#include "vtkDataArray.h"

class VTK_EXPORT vtkAttributeData : public vtkObject 
{
public:
  vtkTypeMacro(vtkAttributeData,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Allocate initial memory size.
  virtual int Allocate(const int sz, const int ext=1000);
  
  // Description:
  // Return object to instantiated state.
  virtual void Initialize();

  // Description:
  // Virtual constructor creates object of same type as this object.
  virtual vtkAttributeData *MakeObject() = 0;

  // Description:
  // Set/Get the underlying data array. This function must be implemented
  // in a concrete subclass to check for consistency. (The tuple size must
  // match the type of data. For example, 3-tuple data array can be assigned to
  // a vector, normal, or points object, but not a tensor object, which has a 
  // tuple dimension of 9. Scalars, on the other hand, can have tuple dimension
  //  from 1-4, depending on the type of scalar.)
  virtual void SetData(vtkDataArray *);
  vtkDataArray *GetData() {return this->Data;};

  // Description:
  // Return the underlying data type. An integer indicating data type is 
  // returned as specified in vtkSetGet.h.
  virtual int GetDataType();

  // Description:
  // Specify the underlying data type of the object.
  virtual void SetDataType(int dataType);
  void SetDataTypeToBit() {this->SetDataType(VTK_BIT);};
  void SetDataTypeToChar() {this->SetDataType(VTK_CHAR);};
  void SetDataTypeToUnsignedChar() {this->SetDataType(VTK_UNSIGNED_CHAR);};
  void SetDataTypeToShort() {this->SetDataType(VTK_SHORT);};
  void SetDataTypeToUnsignedShort() {this->SetDataType(VTK_UNSIGNED_SHORT);};
  void SetDataTypeToInt() {this->SetDataType(VTK_INT);};
  void SetDataTypeToUnsignedInt() {this->SetDataType(VTK_UNSIGNED_INT);};
  void SetDataTypeToLong() {this->SetDataType(VTK_LONG);};
  void SetDataTypeToUnsignedLong() {this->SetDataType(VTK_UNSIGNED_LONG);};
  void SetDataTypeToFloat() {this->SetDataType(VTK_FLOAT);};
  void SetDataTypeToDouble() {this->SetDataType(VTK_DOUBLE);};

  // Description:
  // Return a void pointer. For image pipeline interface and other 
  // special pointer manipulation.
  void *GetVoidPointer(const int id) {return this->Data->GetVoidPointer(id);};

  // Description:
  // Reclaim any extra memory.
  virtual void Squeeze() {this->Data->Squeeze();};

  // Description:
  // Make object look empty but do not delete memory.  
  virtual void Reset() {this->Data->Reset();};

  // Description:
  // Different ways to copy data. Shallow copy does reference count (i.e.,
  // assigns pointers and updates reference count); deep copy runs through
  // entire data array assigning values.
  virtual void DeepCopy(vtkAttributeData *ad);
  virtual void ShallowCopy(vtkAttributeData *ad);

  // Description:
  // Return the memory in kilobytes consumed by this attribute data. 
  // Used to support streaming and reading/writing data. The value 
  // returned is guaranteed to be greater than or equal to the 
  // memory required to actually represent the data represented 
  // by this object. The information returned is valid only after
  // the pipeline has been updated.
  unsigned long GetActualMemorySize();

  // Description:
  // For legacy compatibility. Do not use.
  void DeepCopy(vtkAttributeData &ad) {this->DeepCopy(&ad);}
  void ShallowCopy(vtkAttributeData &ad) {this->ShallowCopy(&ad);}
  
protected:
  // Construct object with an initial data array of type dataType (by default
  // dataType is VTK_FLOAT.
  vtkAttributeData();
  vtkAttributeData(int dataType);
  ~vtkAttributeData();
  vtkAttributeData(const vtkAttributeData&) {};
  void operator=(const vtkAttributeData&) {};

  vtkDataArray *Data;  // Array which represents data

};


#endif
