GenericList.cpp

From Giona

#include <stdlib.h>
#include "bool.h"
#include "GenericListNode.h"
#include "GenericList.h"

/*
 * Constructor
 */
GenericList::GenericList()
{
	this->head = NULL;
	this->length = 0;
	this->lastError = GENERIC_LIST_ERR_NO;
}

/*
 * Destructor
 */
GenericList::~GenericList()
{
	deleteList();
}

/*
 * Adds a node in the list
 * Returns FALSE in case of error, TRUE otherwise
 */
BOOL GenericList::addNode(GenericListNode* node)
{
	if(node==NULL)
	{
		this->lastError = GENERIC_LIST_ERR_NULL_NODE;
		return FALSE;
	}
	this->length++;
	if(this->head==NULL)
	{
		head=node;
		return TRUE;
	}
	GenericListNode *tmp = this->head;
	while(tmp->getNext() != NULL)
		tmp = tmp->getNext();
	tmp->setNext(node);
	return TRUE;
}

/*
 * returns the head node of the list
 */
GenericListNode *GenericList::getHead()
{
	return this->head;
}


/*
 * Deletes the node from the list. Returns FALSE in case
 * of error, TRUE otherwise
 */ 
BOOL GenericList::deleteNode(GenericListNode *node)
{
	if(this->head==NULL)
	{
		this->lastError = GENERIC_LIST_ERR_EMPTY_LIST;
		return FALSE;
	}
	if(node==NULL)
	{
		this->lastError = GENERIC_LIST_ERR_NULL_NODE;
		return FALSE;
	}
	GenericListNode *tmp = this->head;
	if (tmp == node)
	{
		this->head = tmp->getNext();
		delete(tmp);
		this->length --;
		return TRUE;
	}
	while((tmp->getNext()!=NULL)&&(tmp->getNext()!=node))
		tmp=tmp->getNext();
	if(tmp->getNext()==NULL)
	{
		this->lastError = GENERIC_LIST_ERR_NODE_NOT_FOUND;
		return FALSE;
	}
	GenericListNode* delNode=tmp->getNext();
	tmp->setNext(delNode->getNext());
	delete(delNode);
	this->length--;
	return TRUE;
}

/*
 * Returns last error code
 */
int GenericList::getLastError()
{
	return this->lastError;
}

/*
 * Returns the number of list nodes
 */
int GenericList::getLength()
{
	return this->length;
}

/*
 * (Private) deletes all list nodes 
 */
void GenericList::deleteList()
{
	GenericListNode * tmp = this->head;
	while(tmp)
	{
		GenericListNode* tmpNext=tmp->getNext();
		delete (tmp);
		tmp=tmpNext;
	}
}