collect.cpp

来自「HP公司的SNMP++的Win32版本源码」· C++ 代码 · 共 291 行

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

  Copyright (c) 1999
  Hewlett-Packard Company

  ATTENTION: USE OF THIS SOFTWARE IS SUBJECT TO THE FOLLOWING TERMS.
  Permission to use, copy, modify, distribute and/or sell this software 
  and/or its documentation is hereby granted without fee. User agrees 
  to display the above copyright notice and this license notice in all 
  copies of the software and any documentation of the software. User 
  agrees to assume all liability for the use of the software; Hewlett-Packard 
  makes no representations about the suitability of this software for any 
  purpose. It is provided "AS-IS without warranty of any kind,either express 
  or implied. User hereby grants a royalty-free license to any and all 
  derivatives based upon this software code base. 


  SNMP++ C O L L E C T . C P P  
      
  COLLECTION CLASS DEFINITION
       
  VERSION:
  2.8
  
  RCS INFO:
  $Header: $
       
  DESIGN:
  Peter E Mellquist
                
  AUTHOR:      
  Peter E Mellquist
              
  LANGUAGE:
  ANSI C++ 
      
  OPERATING SYSTEMS:
  Win 32
  BSD UNIX
      
  DESCRIPTION:
  Simple Collection classes for SNMP++ classes.
      
=====================================================================*/ 

#include "collect.h"

#ifdef __unix

// create an empty collection
template <class T>
SnmpCollection<T>::SnmpCollection( void):count(0)
{ 
  data.next=0;
  data.prev=0;
};

   
// create a collection using a single template object
template <class T>
SnmpCollection<T>::SnmpCollection( const T &t):count( 1) 
{ 
  data.item[0] = new T( t);
  data.next=0;
  data.prev=0;
};

// create a collection with another collection
// copy constructor
template <class T>
SnmpCollection<T>::SnmpCollection( const SnmpCollection<T> &c)
{
  count = 0;
  data.next=0;
  data.prev=0;

  if ( c.count == 0) {
   count = 0;
   return;
  }

  // load up the new collection
  cBlock *current = &data;
  cBlock *nextBlock;
  int cn = 0;
  count = 0;
  while ( count < c.count) {
 	 if ( cn >= MAXT) {
		 nextBlock = new cBlock;
		 nextBlock->prev = current;
		 nextBlock->next = 0;
		 current->next = nextBlock;
		 current = nextBlock;
		 cn=0;
	 }
	 current->item[cn] = new T(c[count]);
     count++;
	 cn++;
  }
};

// destroy the collection
template <class T>
SnmpCollection<T>::~SnmpCollection()
{ 
  if ( count == 0)
	 return;

  // delete the data
  cBlock *current = &data;
  int z=0;
  int cn=0;
  while ( z< count) {
    if (cn >= MAXT) {
	  cn =0;
	  current = current->next;
	}
	  delete current->item[cn];
	  cn++;
	  z++;
  }

  // delete the blocks
  while ( current->next != 0)
	 current = current->next;
  while ( current->prev != 0) {
    current = current->prev;
	delete current->next;
   }
};
   
// get the size of the collection
template <class T>
int SnmpCollection<T>::size()
{ 
  return count; 
};

// append an item to the collection
template <class T>
SnmpCollection<T>& SnmpCollection<T>::operator +=( const T &i)
{ 

  cBlock *current = &data;
  cBlock *add;
  int cn = (int) count % MAXT;
  while (current->next != 0)
    current = current->next;
  if ((count > 0) && ((count % MAXT)== 0)) {
   add = new cBlock;
   current->next = add;
   add->prev =  current;
   add->next = 0;
   add->item[0] = new T(i);
   }
   else {
     current->item[cn] = new T(i);
	 cn++;
   }
   count++;
   return *this; 
};


// assign one collection to another
template <class T>
SnmpCollection<T>& SnmpCollection<T>::operator = ( const SnmpCollection<T> &c)
{
   // delete the data
   cBlock *current = &data;
   int z=0;
   int cn=0;
   while ( z< count) {
      if (cn >= MAXT) {
	     cn =0;
	     current = current->next;
      }
	  delete current->item[cn];
	  cn++;
	  z++;
   }
   // delete the blocks
   while ( current->next != 0)
      current = current->next;
   while ( current->prev != 0) {
      current = current->prev;
	  delete current->next;
   }
   count=0;

   if ( c.count ==0)
	 return *this;

   // load up the new collection
   current = &data;
   cBlock *nextBlock;
   cn = 0;
   count = 0;
   while ( count < c.count) {
      if ( cn >= MAXT) {
	     nextBlock = new cBlock;
		 nextBlock->prev = current;
		 nextBlock->next = 0;
		 current->next = nextBlock;
		 current = nextBlock;
		 cn=0;
	   }
	   current->item[cn] = new T( c[count]);
       count++;
	   cn++;
   }
   return *this;
};

// access an element in the collection
template <class T>
T SnmpCollection<T>::operator[]( int p)	const
{ 
   if (p<count) {
     cBlock const *current = &data;
     int bn = (int) (p / MAXT);
	 for (int z=0; z<bn; z++)
	    current = current->next;
	 int cn = (int) p % MAXT;
	 return (T) *(current->item[cn]);
   }
   else {   // return an instance of nothing!!
      T t;
	  return (T) (t);
   }
};


// set an element in the collection
template <class T>
int SnmpCollection<T>::set_element( const T& i, const int p)
{ 
   cBlock *current = &data;
   if ( p > count)
      return -1; // not found!
   int bn = (int) p / MAXT;
   int cn = (int) p % MAXT;
   for (int z=0; z<bn; z++)
      current = current->next;
   delete current->item[cn];
   current->item[cn] = new T(i);
   return 0;
};


// get an element in the collection
template <class T>
int SnmpCollection<T>::get_element( T& i, const int p) const
{ 
   cBlock const *current = &data;
   if ( p > count)
      return -1; // not found!
   int bn = (int) p / MAXT;
   int cn = (int) p % MAXT;
   for (int z=0; z<bn; z++)
      current = current->next;
   i = *(current->item[cn]);
   return 0;
};

// apply an function to the entire collection, iterator
template <class T>
void SnmpCollection<T>::apply( void f( T&))
{ 
   T temp;
   for ( int z=0;z<count;z++) {
      this->get_element( temp,z);
	  f( temp);
   }
}

// looks for an element in the collection
// returns TRUE if found
template <class T>
int SnmpCollection<T>::find( const T& i)
{
   T temp;
   for ( int z=0;z<count;z++) {
      this->get_element( temp,z);
	  if ( temp == i)
	    return TRUE;
   }
   return FALSE;
}
#endif  // end if __unix