/*
   Copyright (C) 2003, 2005, 2006 MySQL AB
    All rights reserved. Use is subject to license terms.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef CARRAY_HPP
#define CARRAY_HPP

#include "ndbd_malloc.hpp"

/**
 * Template class used for implementing an c - array
 */
template <class T>
class CArray {
public:
  CArray();
  ~CArray();
  
  /**
   * Set the size of the pool
   *
   * Note, can currently only be called once
   */
  bool setSize(Uint32 noOfElements, bool exit_on_error = true);

  /**
   * Get size
   */
  Uint32 getSize() const;
  
  /**
   * Update p value for ptr according to i value 
   */
  void getPtr(Ptr<T> &) const;
  
  /**
   * Get pointer for i value
   */
  T * getPtr(Uint32 i) const;

  /**
   * Update p & i value for ptr according to <b>i</b> value 
   */
  void getPtr(Ptr<T> &, Uint32 i) const;

private:
  Uint32 size;
  T * theArray;
};

template <class T>
inline
CArray<T>::CArray(){
  size = 0;
  theArray = 0;
}

template <class T>
inline
CArray<T>::~CArray(){
  if(theArray != 0){
    ndbd_free(theArray, size * sizeof(T));
    theArray = 0;
  }
}

/**
 * Set the size of the pool
 *
 * Note, can currently only be called once
 */
template <class T>
inline
bool
CArray<T>::setSize(Uint32 noOfElements, bool exit_on_error){
  if(size == noOfElements)
    return true;
  
  theArray = (T *)ndbd_malloc(noOfElements * sizeof(T));
  if(theArray == 0)
  {
    if (!exit_on_error)
      return false;
    ErrorReporter::handleAssert("CArray<T>::setSize malloc failed",
				__FILE__, __LINE__, NDBD_EXIT_MEMALLOC);
    return false; // not reached
  }
  size = noOfElements;
  return true;
}

template<class T>
inline
Uint32
CArray<T>::getSize() const {
  return size;
}

template <class T>
inline
void
CArray<T>::getPtr(Ptr<T> & ptr) const {
  const Uint32 i = ptr.i;
  if(i < size){
    ptr.p = &theArray[i];
    return;
  } else {
    ErrorReporter::handleAssert("CArray<T>::getPtr", __FILE__, __LINE__);
  }
}
  
template <class T>
inline
T * 
CArray<T>::getPtr(Uint32 i) const {
  if(i < size){
    return &theArray[i];
  } else {
    ErrorReporter::handleAssert("CArray<T>::getPtr", __FILE__, __LINE__);
    return 0;
  }
}

template <class T>
inline
void
CArray<T>::getPtr(Ptr<T> & ptr, Uint32 i) const {
  ptr.i = i;
  if(i < size){
    ptr.p = &theArray[i];
    return;
  } else {
    ErrorReporter::handleAssert("CArray<T>::getPtr", __FILE__, __LINE__);
  }
}

#endif
