/******************************************************************************
Function Specifications: replaceBeforeCursor
===============================================================================
Preconditions:
- list is not empty
- cursor not at beginning of list
Postconditions:
- the data in the node before the cursor is replaced with newDataItem
- returns true if successful
Algorithm:
- data is changed using cursor movements and assignments
Exceptional/Error Conditions:
- list empty exception handled (returns false)
- cursor at beginning exception handled (returns false)
*/
bool LinkedList::replaceBeforeCursor
(
int newDataItem // input: data to replace existing data
)
{
// if empty
if( isEmpty() )
{
return false;
}
// if at beginning of list
else if( cursor == head )
{
return false;
}
// normal operation
else
{
goToPrior();
replaceAtCursor( newDataItem );
return true;
}
}
void Cursor::addAtCursor(const QByteArray &data, bool only_latin)
{
if (m_insert_mode == Replace) {
replaceAtCursor(data, only_latin);
} else {
insertAtCursor(data, only_latin);
}
}
void Cursor::addAtCursor(const QByteArray &data)
{
if (m_insert_mode == Replace) {
replaceAtCursor(data);
} else {
insertAtCursor(data);
}
}
/******************************************************************************
Function Specifications: replaceAfterCursor
===============================================================================
Preconditions:
- list is not empty
- cursor not at end of list
Postconditions:
- the data in the node after the cursor is replaced with newDataItem
- true is returned if successful
Algorithm:
- cursor movements are used and assignments manipulate data
Exceptional/Error Conditions:
- list empty exception handled (returns false)
- cursor at end exception handled (returns false)
*/
bool LinkedList::replaceAfterCursor
(
int newDataItem // input: data to replace existing data
)
{
// if empty
if( isEmpty() )
{
return false;
}
// if at end of list
else if( cursor->next == NULL )
{
return false;
}
// normal operation
else
{
goToNext();
replaceAtCursor( newDataItem );
return true;
}
}
